$(TOP)/ext/misc/amatch.c \
  $(TOP)/ext/misc/closure.c \
  $(TOP)/ext/misc/eval.c \
  $(TOP)/ext/misc/fileio.c \
  $(TOP)/ext/misc/fuzzer.c \
  $(TOP)/ext/fts5/fts5_tcl.c \
  $(TOP)/ext/fts5/fts5_test_mi.c \

  $(TOP)/ext/misc/ieee754.c \
  $(TOP)/ext/misc/nextchar.c \
  $(TOP)/ext/misc/percentile.c \
  $(TOP)/ext/misc/regexp.c \
  $(TOP)/ext/misc/series.c \
  $(TOP)/ext/misc/spellfix.c \
  $(TOP)/ext/misc/totype.c \

  $(TOP)/ext/misc/amatch.c \
  $(TOP)/ext/misc/closure.c \
  $(TOP)/ext/misc/eval.c \
  $(TOP)/ext/misc/fileio.c \
  $(TOP)/ext/misc/fuzzer.c \
  $(TOP)/ext/fts5/fts5_tcl.c \
  $(TOP)/ext/fts5/fts5_test_mi.c \
  $(TOP)/ext/fts5/fts5_test_tok.c \
  $(TOP)/ext/misc/ieee754.c \
  $(TOP)/ext/misc/nextchar.c \
  $(TOP)/ext/misc/percentile.c \
  $(TOP)/ext/misc/regexp.c \
  $(TOP)/ext/misc/series.c \
  $(TOP)/ext/misc/spellfix.c \
  $(TOP)/ext/misc/totype.c \

  $(TOP)\ext\misc\amatch.c \
  $(TOP)\ext\misc\closure.c \
  $(TOP)\ext\misc\eval.c \
  $(TOP)\ext\misc\fileio.c \
  $(TOP)\ext\misc\fuzzer.c \
  $(TOP)\ext\fts5\fts5_tcl.c \
  $(TOP)\ext\fts5\fts5_test_mi.c \

  $(TOP)\ext\misc\ieee754.c \
  $(TOP)\ext\misc\nextchar.c \
  $(TOP)\ext\misc\percentile.c \
  $(TOP)\ext\misc\regexp.c \
  $(TOP)\ext\misc\series.c \
  $(TOP)\ext\misc\spellfix.c \
  $(TOP)\ext\misc\totype.c \
................................................................................

fts5_ext.lo:	fts5.c $(HDR) $(EXTHDR)
	$(LTCOMPILE) $(NO_WARN) -c fts5.c

fts5.dll:	fts5_ext.lo
	$(LD) $(LDFLAGS) $(LTLINKOPTS) $(LTLIBPATHS) /DLL /OUT:$@ fts5_ext.lo

sqlite3rbu.lo:	$(TOP)/ext/rbu/sqlite3rbu.c $(HDR) $(EXTHDR)
	$(LTCOMPILE) -DSQLITE_CORE -c $(TOP)/ext/rbu/sqlite3rbu.c

# Rules to build the 'testfixture' application.
#
# If using the amalgamation, use sqlite3.c directly to build the test
# fixture.  Otherwise link against libsqlite3.lib.  (This distinction is
# necessary because the test fixture requires non-API symbols which are
# hidden when the library is built via the amalgamation).
................................................................................
		$(TOP)\test\wordcount.c $(SQLITE3C) /link $(LDFLAGS) $(LTLINKOPTS)

speedtest1.exe:	$(TOP)\test\speedtest1.c $(SQLITE3C)
	$(LTLINK) $(NO_WARN) -DSQLITE_OMIT_LOAD_EXTENSION -Fe$@ \
		$(TOP)\test\speedtest1.c $(SQLITE3C) /link $(LDFLAGS) $(LTLINKOPTS)

rbu.exe: $(TOP)\ext\rbu\rbu.c $(TOP)\ext\rbu\sqlite3rbu.c $(SQLITE3C)
	$(LTLINK) $(NO_WARN) -I. -DSQLITE_ENABLE_RBU -Fe$@ $(TOP)\ext\rbu\rbu.c $(SQLITE3C) \
		$(LDFLAGS) $(LTLINKOPTS)

clean:
	del /Q *.exp *.lo *.ilk *.lib *.obj *.ncb *.pdb *.sdf *.suo 2>NUL
	del /Q *.bsc *.cod *.da *.bb *.bbg gmon.out 2>NUL
	del /Q sqlite3.h opcodes.c opcodes.h 2>NUL
	del /Q lemon.* lempar.c parse.* 2>NUL
	del /Q mkkeywordhash.* keywordhash.h 2>NUL

  $(TOP)\ext\misc\amatch.c \
  $(TOP)\ext\misc\closure.c \
  $(TOP)\ext\misc\eval.c \
  $(TOP)\ext\misc\fileio.c \
  $(TOP)\ext\misc\fuzzer.c \
  $(TOP)\ext\fts5\fts5_tcl.c \
  $(TOP)\ext\fts5\fts5_test_mi.c \
  $(TOP)\ext\fts5\fts5_test_tok.c \
  $(TOP)\ext\misc\ieee754.c \
  $(TOP)\ext\misc\nextchar.c \
  $(TOP)\ext\misc\percentile.c \
  $(TOP)\ext\misc\regexp.c \
  $(TOP)\ext\misc\series.c \
  $(TOP)\ext\misc\spellfix.c \
  $(TOP)\ext\misc\totype.c \
................................................................................

fts5_ext.lo:	fts5.c $(HDR) $(EXTHDR)
	$(LTCOMPILE) $(NO_WARN) -c fts5.c

fts5.dll:	fts5_ext.lo
	$(LD) $(LDFLAGS) $(LTLINKOPTS) $(LTLIBPATHS) /DLL /OUT:$@ fts5_ext.lo

sqlite3rbu.lo:	$(TOP)\ext\rbu\sqlite3rbu.c $(HDR) $(EXTHDR)
	$(LTCOMPILE) -DSQLITE_CORE -c $(TOP)\ext\rbu\sqlite3rbu.c

# Rules to build the 'testfixture' application.
#
# If using the amalgamation, use sqlite3.c directly to build the test
# fixture.  Otherwise link against libsqlite3.lib.  (This distinction is
# necessary because the test fixture requires non-API symbols which are
# hidden when the library is built via the amalgamation).
................................................................................
		$(TOP)\test\wordcount.c $(SQLITE3C) /link $(LDFLAGS) $(LTLINKOPTS)

speedtest1.exe:	$(TOP)\test\speedtest1.c $(SQLITE3C)
	$(LTLINK) $(NO_WARN) -DSQLITE_OMIT_LOAD_EXTENSION -Fe$@ \
		$(TOP)\test\speedtest1.c $(SQLITE3C) /link $(LDFLAGS) $(LTLINKOPTS)

rbu.exe: $(TOP)\ext\rbu\rbu.c $(TOP)\ext\rbu\sqlite3rbu.c $(SQLITE3C)
	$(LTLINK) $(NO_WARN) -DSQLITE_ENABLE_RBU -Fe$@ $(TOP)\ext\rbu\rbu.c $(SQLITE3C) \
		/link $(LDFLAGS) $(LTLINKOPTS)

clean:
	del /Q *.exp *.lo *.ilk *.lib *.obj *.ncb *.pdb *.sdf *.suo 2>NUL
	del /Q *.bsc *.cod *.da *.bb *.bbg gmon.out 2>NUL
	del /Q sqlite3.h opcodes.c opcodes.h 2>NUL
	del /Q lemon.* lempar.c parse.* 2>NUL
	del /Q mkkeywordhash.* keywordhash.h 2>NUL

/*
** Buffer object for the incremental building of string data.
*/
typedef struct Fts5Buffer Fts5Buffer;
struct Fts5Buffer {
  u8 *p;
  int n;
  int nSpace;
};

int sqlite3Fts5BufferSize(int*, Fts5Buffer*, int);
void sqlite3Fts5BufferAppendVarint(int*, Fts5Buffer*, i64);
void sqlite3Fts5BufferAppendBlob(int*, Fts5Buffer*, int, const u8*);
void sqlite3Fts5BufferAppendString(int *, Fts5Buffer*, const char*);
void sqlite3Fts5BufferFree(Fts5Buffer*);
void sqlite3Fts5BufferZero(Fts5Buffer*);
void sqlite3Fts5BufferSet(int*, Fts5Buffer*, int, const u8*);
void sqlite3Fts5BufferAppendPrintf(int *, Fts5Buffer*, char *zFmt, ...);

char *sqlite3Fts5Mprintf(int *pRc, const char *zFmt, ...);
................................................................................
int sqlite3Fts5StorageOpen(Fts5Config*, Fts5Index*, int, Fts5Storage**, char**);
int sqlite3Fts5StorageClose(Fts5Storage *p);
int sqlite3Fts5StorageRename(Fts5Storage*, const char *zName);

int sqlite3Fts5DropAll(Fts5Config*);
int sqlite3Fts5CreateTable(Fts5Config*, const char*, const char*, int, char **);

int sqlite3Fts5StorageDelete(Fts5Storage *p, i64);
int sqlite3Fts5StorageContentInsert(Fts5Storage *p, sqlite3_value**, i64*);
int sqlite3Fts5StorageIndexInsert(Fts5Storage *p, sqlite3_value**, i64);

int sqlite3Fts5StorageIntegrity(Fts5Storage *p);

int sqlite3Fts5StorageStmt(Fts5Storage *p, int eStmt, sqlite3_stmt**, char**);
void sqlite3Fts5StorageStmtRelease(Fts5Storage *p, int eStmt, sqlite3_stmt*);
................................................................................
int sqlite3Fts5StorageSync(Fts5Storage *p, int bCommit);
int sqlite3Fts5StorageRollback(Fts5Storage *p);

int sqlite3Fts5StorageConfigValue(
    Fts5Storage *p, const char*, sqlite3_value*, int
);

int sqlite3Fts5StorageSpecialDelete(Fts5Storage *p, i64 iDel, sqlite3_value**);

int sqlite3Fts5StorageDeleteAll(Fts5Storage *p);
int sqlite3Fts5StorageRebuild(Fts5Storage *p);
int sqlite3Fts5StorageOptimize(Fts5Storage *p);
int sqlite3Fts5StorageMerge(Fts5Storage *p, int nMerge);

/*
** End of interface to code in fts5_storage.c.

/*
** Buffer object for the incremental building of string data.
*/
typedef struct Fts5Buffer Fts5Buffer;
struct Fts5Buffer {
  u8 *p;
  u32 n;
  u32 nSpace;
};

int sqlite3Fts5BufferSize(int*, Fts5Buffer*, u32);
void sqlite3Fts5BufferAppendVarint(int*, Fts5Buffer*, i64);
void sqlite3Fts5BufferAppendBlob(int*, Fts5Buffer*, u32, const u8*);
void sqlite3Fts5BufferAppendString(int *, Fts5Buffer*, const char*);
void sqlite3Fts5BufferFree(Fts5Buffer*);
void sqlite3Fts5BufferZero(Fts5Buffer*);
void sqlite3Fts5BufferSet(int*, Fts5Buffer*, int, const u8*);
void sqlite3Fts5BufferAppendPrintf(int *, Fts5Buffer*, char *zFmt, ...);

char *sqlite3Fts5Mprintf(int *pRc, const char *zFmt, ...);
................................................................................
int sqlite3Fts5StorageOpen(Fts5Config*, Fts5Index*, int, Fts5Storage**, char**);
int sqlite3Fts5StorageClose(Fts5Storage *p);
int sqlite3Fts5StorageRename(Fts5Storage*, const char *zName);

int sqlite3Fts5DropAll(Fts5Config*);
int sqlite3Fts5CreateTable(Fts5Config*, const char*, const char*, int, char **);

int sqlite3Fts5StorageDelete(Fts5Storage *p, i64, sqlite3_value**);
int sqlite3Fts5StorageContentInsert(Fts5Storage *p, sqlite3_value**, i64*);
int sqlite3Fts5StorageIndexInsert(Fts5Storage *p, sqlite3_value**, i64);

int sqlite3Fts5StorageIntegrity(Fts5Storage *p);

int sqlite3Fts5StorageStmt(Fts5Storage *p, int eStmt, sqlite3_stmt**, char**);
void sqlite3Fts5StorageStmtRelease(Fts5Storage *p, int eStmt, sqlite3_stmt*);
................................................................................
int sqlite3Fts5StorageSync(Fts5Storage *p, int bCommit);
int sqlite3Fts5StorageRollback(Fts5Storage *p);

int sqlite3Fts5StorageConfigValue(
    Fts5Storage *p, const char*, sqlite3_value*, int
);



int sqlite3Fts5StorageDeleteAll(Fts5Storage *p);
int sqlite3Fts5StorageRebuild(Fts5Storage *p);
int sqlite3Fts5StorageOptimize(Fts5Storage *p);
int sqlite3Fts5StorageMerge(Fts5Storage *p, int nMerge);

/*
** End of interface to code in fts5_storage.c.

******************************************************************************
*/



#include "fts5Int.h"

int sqlite3Fts5BufferSize(int *pRc, Fts5Buffer *pBuf, int nByte){
  int nNew = pBuf->nSpace ? pBuf->nSpace*2 : 64;
  u8 *pNew;
  while( nNew<nByte ){
    nNew = nNew * 2;
  }
  pNew = sqlite3_realloc(pBuf->p, nNew);
  if( pNew==0 ){
    *pRc = SQLITE_NOMEM;
................................................................................
** Append buffer nData/pData to buffer pBuf. If an OOM error occurs, set 
** the error code in p. If an error has already occurred when this function
** is called, it is a no-op.
*/
void sqlite3Fts5BufferAppendBlob(
  int *pRc,
  Fts5Buffer *pBuf, 
  int nData, 
  const u8 *pData
){
  assert( *pRc || nData>=0 );
  if( fts5BufferGrow(pRc, pBuf, nData) ) return;
  memcpy(&pBuf->p[pBuf->n], pData, nData);
  pBuf->n += nData;
}

/*
** Append the nul-terminated string zStr to the buffer pBuf. This function
................................................................................
  const char *pTerm, int nTerm, 
  int *pbPresent
){
  int rc = SQLITE_OK;
  *pbPresent = 0;
  if( p ){
    int i;
    int hash;
    Fts5TermsetEntry *pEntry;

    /* Calculate a hash value for this term */
    hash = 104 + iIdx;
    for(i=0; i<nTerm; i++){


      hash += (hash << 3) + (int)pTerm[i];
    }

    hash = hash % ArraySize(p->apHash);

    for(pEntry=p->apHash[hash]; pEntry; pEntry=pEntry->pNext){
      if( pEntry->iIdx==iIdx 
          && pEntry->nTerm==nTerm 
          && memcmp(pEntry->pTerm, pTerm, nTerm)==0 
        ){

******************************************************************************
*/



#include "fts5Int.h"

int sqlite3Fts5BufferSize(int *pRc, Fts5Buffer *pBuf, u32 nByte){
  u32 nNew = pBuf->nSpace ? pBuf->nSpace*2 : 64;
  u8 *pNew;
  while( nNew<nByte ){
    nNew = nNew * 2;
  }
  pNew = sqlite3_realloc(pBuf->p, nNew);
  if( pNew==0 ){
    *pRc = SQLITE_NOMEM;
................................................................................
** Append buffer nData/pData to buffer pBuf. If an OOM error occurs, set 
** the error code in p. If an error has already occurred when this function
** is called, it is a no-op.
*/
void sqlite3Fts5BufferAppendBlob(
  int *pRc,
  Fts5Buffer *pBuf, 
  u32 nData, 
  const u8 *pData
){
  assert_nc( *pRc || nData>=0 );
  if( fts5BufferGrow(pRc, pBuf, nData) ) return;
  memcpy(&pBuf->p[pBuf->n], pData, nData);
  pBuf->n += nData;
}

/*
** Append the nul-terminated string zStr to the buffer pBuf. This function
................................................................................
  const char *pTerm, int nTerm, 
  int *pbPresent
){
  int rc = SQLITE_OK;
  *pbPresent = 0;
  if( p ){
    int i;
    int hash = 13;
    Fts5TermsetEntry *pEntry;

    /* Calculate a hash value for this term. This is the same hash checksum
    ** used by the fts5_hash.c module. This is not important for correct
    ** operation of the module, but is necessary to ensure that some tests
    ** designed to produce hash table collisions really do work.  */
    for(i=nTerm-1; i>=0; i--){
      hash = (hash << 3) ^ hash ^ pTerm[i];
    }
    hash = (hash << 3) ^ hash ^ iIdx;
    hash = hash % ArraySize(p->apHash);

    for(pEntry=p->apHash[hash]; pEntry; pEntry=pEntry->pNext){
      if( pEntry->iIdx==iIdx 
          && pEntry->nTerm==nTerm 
          && memcmp(pEntry->pTerm, pTerm, nTerm)==0 
        ){

      }

      while( p[0]>='0' && p[0]<='9' && nPre<1000 ){
        nPre = nPre*10 + (p[0] - '0');
        p++;
      }

      if( rc==SQLITE_OK && (nPre<=0 || nPre>=1000) ){
        *pzErr = sqlite3_mprintf("prefix length out of range (max 999)");
        rc = SQLITE_ERROR;
        break;
      }

      pConfig->aPrefix[pConfig->nPrefix] = nPre;
      pConfig->nPrefix++;

      }

      while( p[0]>='0' && p[0]<='9' && nPre<1000 ){
        nPre = nPre*10 + (p[0] - '0');
        p++;
      }

      if( nPre<=0 || nPre>=1000 ){
        *pzErr = sqlite3_mprintf("prefix length out of range (max 999)");
        rc = SQLITE_ERROR;
        break;
      }

      pConfig->aPrefix[pConfig->nPrefix] = nPre;
      pConfig->nPrefix++;

  int rc;

  assert( pNode->eType==FTS5_TERM );
  assert( pNear->nPhrase==1 && pPhrase->nTerm==1 );
  assert( pPhrase->aTerm[0].pSynonym==0 );

  rc = sqlite3Fts5IterPoslist(pIter, pColset, 
      (const u8**)&pPhrase->poslist.p, &pPhrase->poslist.n, &pNode->iRowid
  );
  pNode->bNomatch = (pPhrase->poslist.n==0);
  return rc;
}

/*
** All individual term iterators in pNear are guaranteed to be valid when
................................................................................
      aPopulator[i].bOk = 0;
    }else{
      aPopulator[i].bOk = 1;
    }
  }

  return sqlite3Fts5Tokenize(pConfig, 
      FTS5_TOKENIZE_AUX, z, n, (void*)&sCtx, fts5ExprPopulatePoslistsCb
  );
}

static void fts5ExprClearPoslists(Fts5ExprNode *pNode){
  if( pNode->eType==FTS5_TERM || pNode->eType==FTS5_STRING ){
    pNode->pNear->apPhrase[0]->poslist.n = 0;
  }else{
................................................................................
    for(i=0; i<pNode->nChild; i++){
      fts5ExprClearPoslists(pNode->apChild[i]);
    }
  }
}

static int fts5ExprCheckPoslists(Fts5ExprNode *pNode, i64 iRowid){
  if( pNode ){
    pNode->iRowid = iRowid;
    pNode->bEof = 0;
    switch( pNode->eType ){
      case FTS5_TERM:
      case FTS5_STRING:
        return (pNode->pNear->apPhrase[0]->poslist.n>0);

      case FTS5_AND: {
        int i;
        for(i=0; i<pNode->nChild; i++){
          if( fts5ExprCheckPoslists(pNode->apChild[i], iRowid)==0 ){
            fts5ExprClearPoslists(pNode);
            return 0;
          }
        }
        break;
      }

      case FTS5_OR: {
        int i;
        int bRet = 0;
        for(i=0; i<pNode->nChild; i++){
          if( fts5ExprCheckPoslists(pNode->apChild[i], iRowid) ){
            bRet = 1;
          }
        }
        if( bRet==0 ){
          fts5ExprClearPoslists(pNode);
        }
        return bRet;
      }

      default: {
        assert( pNode->eType==FTS5_NOT );
        if( 0==fts5ExprCheckPoslists(pNode->apChild[0], iRowid)
         || 0!=fts5ExprCheckPoslists(pNode->apChild[1], iRowid)
        ){
          fts5ExprClearPoslists(pNode);
          return 0;
        }
        break;
      }
    }
  }
  return 1;
}

void sqlite3Fts5ExprCheckPoslists(Fts5Expr *pExpr, i64 iRowid){
  fts5ExprCheckPoslists(pExpr->pRoot, iRowid);

  int rc;

  assert( pNode->eType==FTS5_TERM );
  assert( pNear->nPhrase==1 && pPhrase->nTerm==1 );
  assert( pPhrase->aTerm[0].pSynonym==0 );

  rc = sqlite3Fts5IterPoslist(pIter, pColset, 
      (const u8**)&pPhrase->poslist.p, (int*)&pPhrase->poslist.n, &pNode->iRowid
  );
  pNode->bNomatch = (pPhrase->poslist.n==0);
  return rc;
}

/*
** All individual term iterators in pNear are guaranteed to be valid when
................................................................................
      aPopulator[i].bOk = 0;
    }else{
      aPopulator[i].bOk = 1;
    }
  }

  return sqlite3Fts5Tokenize(pConfig, 
      FTS5_TOKENIZE_DOCUMENT, z, n, (void*)&sCtx, fts5ExprPopulatePoslistsCb
  );
}

static void fts5ExprClearPoslists(Fts5ExprNode *pNode){
  if( pNode->eType==FTS5_TERM || pNode->eType==FTS5_STRING ){
    pNode->pNear->apPhrase[0]->poslist.n = 0;
  }else{
................................................................................
    for(i=0; i<pNode->nChild; i++){
      fts5ExprClearPoslists(pNode->apChild[i]);
    }
  }
}

static int fts5ExprCheckPoslists(Fts5ExprNode *pNode, i64 iRowid){

  pNode->iRowid = iRowid;
  pNode->bEof = 0;
  switch( pNode->eType ){
    case FTS5_TERM:
    case FTS5_STRING:
      return (pNode->pNear->apPhrase[0]->poslist.n>0);

    case FTS5_AND: {
      int i;
      for(i=0; i<pNode->nChild; i++){
        if( fts5ExprCheckPoslists(pNode->apChild[i], iRowid)==0 ){
          fts5ExprClearPoslists(pNode);
          return 0;
        }
      }
      break;
    }

    case FTS5_OR: {
      int i;
      int bRet = 0;
      for(i=0; i<pNode->nChild; i++){
        if( fts5ExprCheckPoslists(pNode->apChild[i], iRowid) ){
          bRet = 1;
        }
      }



      return bRet;
    }

    default: {
      assert( pNode->eType==FTS5_NOT );
      if( 0==fts5ExprCheckPoslists(pNode->apChild[0], iRowid)
          || 0!=fts5ExprCheckPoslists(pNode->apChild[1], iRowid)
        ){
        fts5ExprClearPoslists(pNode);
        return 0;
      }
      break;

    }
  }
  return 1;
}

void sqlite3Fts5ExprCheckPoslists(Fts5Expr *pExpr, i64 iRowid){
  fts5ExprCheckPoslists(pExpr->pRoot, iRowid);

  Fts5SegIter *pIter,             /* Iterator to advance */
  int *pbNewTerm                  /* OUT: Set for new term */
){
  Fts5Data *pLeaf = pIter->pLeaf;
  int iOff;
  int bNewTerm = 0;
  int nKeep = 0;



  assert( pbNewTerm==0 || *pbNewTerm==0 );
  assert( p->pConfig->eDetail!=FTS5_DETAIL_NONE );

  /* Search for the end of the position list within the current page. */
  u8 *a = pLeaf->p;
  int n = pLeaf->szLeaf;

  ASSERT_SZLEAF_OK(pLeaf);
  iOff = pIter->iLeafOffset + pIter->nPos;

  if( iOff<n ){
    /* The next entry is on the current page. */
    assert_nc( iOff<=pIter->iEndofDoclist );
................................................................................
      iDocid += iDelta;
      sqlite3Fts5BufferAppendPrintf(pRc, pBuf, " id=%lld", iDocid);
    }
  }

  return iOff;
}










































/*
** The implementation of user-defined scalar function fts5_decode().
*/
static void fts5DecodeFunction(
  sqlite3_context *pCtx,          /* Function call context */
  int nArg,                       /* Number of args (always 2) */
................................................................................
  i64 iRowid;                     /* Rowid for record being decoded */
  int iSegid,iHeight,iPgno,bDlidx;/* Rowid components */
  const u8 *aBlob; int n;         /* Record to decode */
  u8 *a = 0;
  Fts5Buffer s;                   /* Build up text to return here */
  int rc = SQLITE_OK;             /* Return code */
  int nSpace = 0;


  assert( nArg==2 );
  memset(&s, 0, sizeof(Fts5Buffer));
  iRowid = sqlite3_value_int64(apVal[0]);

  /* Make a copy of the second argument (a blob) in aBlob[]. The aBlob[]
  ** copy is followed by FTS5_DATA_ZERO_PADDING 0x00 bytes, which prevents
................................................................................
    }
  }else if( iSegid==0 ){
    if( iRowid==FTS5_AVERAGES_ROWID ){
      fts5DecodeAverages(&rc, &s, a, n);
    }else{
      fts5DecodeStructure(&rc, &s, a, n);
    }
















































  }else{
    Fts5Buffer term;              /* Current term read from page */
    int szLeaf;                   /* Offset of pgidx in a[] */
    int iPgidxOff;
    int iPgidxPrev = 0;           /* Previous value read from pgidx */
    int iTermOff = 0;
    int iRowidOff = 0;
................................................................................
** If successful, SQLITE_OK is returned. If an error occurs, some other
** SQLite error code is returned instead.
*/
int sqlite3Fts5IndexInit(sqlite3 *db){
  int rc = sqlite3_create_function(
      db, "fts5_decode", 2, SQLITE_UTF8, 0, fts5DecodeFunction, 0, 0
  );








  if( rc==SQLITE_OK ){
    rc = sqlite3_create_function(
        db, "fts5_rowid", -1, SQLITE_UTF8, 0, fts5RowidFunction, 0, 0
    );
  }
  return rc;
}

  Fts5SegIter *pIter,             /* Iterator to advance */
  int *pbNewTerm                  /* OUT: Set for new term */
){
  Fts5Data *pLeaf = pIter->pLeaf;
  int iOff;
  int bNewTerm = 0;
  int nKeep = 0;
  u8 *a;
  int n;

  assert( pbNewTerm==0 || *pbNewTerm==0 );
  assert( p->pConfig->eDetail!=FTS5_DETAIL_NONE );

  /* Search for the end of the position list within the current page. */
  a = pLeaf->p;
  n = pLeaf->szLeaf;

  ASSERT_SZLEAF_OK(pLeaf);
  iOff = pIter->iLeafOffset + pIter->nPos;

  if( iOff<n ){
    /* The next entry is on the current page. */
    assert_nc( iOff<=pIter->iEndofDoclist );
................................................................................
      iDocid += iDelta;
      sqlite3Fts5BufferAppendPrintf(pRc, pBuf, " id=%lld", iDocid);
    }
  }

  return iOff;
}

/*
** This function is part of the fts5_decode() debugging function. It is 
** only ever used with detail=none tables.
**
** Buffer (pData/nData) contains a doclist in the format used by detail=none
** tables. This function appends a human-readable version of that list to
** buffer pBuf.
**
** If *pRc is other than SQLITE_OK when this function is called, it is a
** no-op. If an OOM or other error occurs within this function, *pRc is
** set to an SQLite error code before returning. The final state of buffer
** pBuf is undefined in this case.
*/
static void fts5DecodeRowidList(
  int *pRc,                       /* IN/OUT: Error code */
  Fts5Buffer *pBuf,               /* Buffer to append text to */
  const u8 *pData, int nData      /* Data to decode list-of-rowids from */
){
  int i = 0;
  i64 iRowid = 0;

  while( i<nData ){
    const char *zApp = "";
    u64 iVal;
    i += sqlite3Fts5GetVarint(&pData[i], &iVal);
    iRowid += iVal;

    if( i<nData && pData[i]==0x00 ){
      i++;
      if( i<nData && pData[i]==0x00 ){
        i++;
        zApp = "+";
      }else{
        zApp = "*";
      }
    }

    sqlite3Fts5BufferAppendPrintf(pRc, pBuf, " %lld%s", iRowid, zApp);
  }
}

/*
** The implementation of user-defined scalar function fts5_decode().
*/
static void fts5DecodeFunction(
  sqlite3_context *pCtx,          /* Function call context */
  int nArg,                       /* Number of args (always 2) */
................................................................................
  i64 iRowid;                     /* Rowid for record being decoded */
  int iSegid,iHeight,iPgno,bDlidx;/* Rowid components */
  const u8 *aBlob; int n;         /* Record to decode */
  u8 *a = 0;
  Fts5Buffer s;                   /* Build up text to return here */
  int rc = SQLITE_OK;             /* Return code */
  int nSpace = 0;
  int eDetailNone = (sqlite3_user_data(pCtx)!=0);

  assert( nArg==2 );
  memset(&s, 0, sizeof(Fts5Buffer));
  iRowid = sqlite3_value_int64(apVal[0]);

  /* Make a copy of the second argument (a blob) in aBlob[]. The aBlob[]
  ** copy is followed by FTS5_DATA_ZERO_PADDING 0x00 bytes, which prevents
................................................................................
    }
  }else if( iSegid==0 ){
    if( iRowid==FTS5_AVERAGES_ROWID ){
      fts5DecodeAverages(&rc, &s, a, n);
    }else{
      fts5DecodeStructure(&rc, &s, a, n);
    }
  }else if( eDetailNone ){
    Fts5Buffer term;              /* Current term read from page */
    int szLeaf;
    int iPgidxOff = szLeaf = fts5GetU16(&a[2]);
    int iTermOff;
    int nKeep = 0;
    int iOff;

    memset(&term, 0, sizeof(Fts5Buffer));

    /* Decode any entries that occur before the first term. */
    if( szLeaf<n ){
      iPgidxOff += fts5GetVarint32(&a[iPgidxOff], iTermOff);
    }else{
      iTermOff = szLeaf;
    }
    fts5DecodeRowidList(&rc, &s, &a[4], iTermOff-4);

    iOff = iTermOff;
    while( iOff<szLeaf ){
      int nAppend;

      /* Read the term data for the next term*/
      iOff += fts5GetVarint32(&a[iOff], nAppend);
      term.n = nKeep;
      fts5BufferAppendBlob(&rc, &term, nAppend, &a[iOff]);
      sqlite3Fts5BufferAppendPrintf(
          &rc, &s, " term=%.*s", term.n, (const char*)term.p
      );
      iOff += nAppend;

      /* Figure out where the doclist for this term ends */
      if( iPgidxOff<n ){
        int nIncr;
        iPgidxOff += fts5GetVarint32(&a[iPgidxOff], nIncr);
        iTermOff += nIncr;
      }else{
        iTermOff = szLeaf;
      }

      fts5DecodeRowidList(&rc, &s, &a[iOff], iTermOff-iOff);
      iOff = iTermOff;
      if( iOff<szLeaf ){
        iOff += fts5GetVarint32(&a[iOff], nKeep);
      }
    }

    fts5BufferFree(&term);
  }else{
    Fts5Buffer term;              /* Current term read from page */
    int szLeaf;                   /* Offset of pgidx in a[] */
    int iPgidxOff;
    int iPgidxPrev = 0;           /* Previous value read from pgidx */
    int iTermOff = 0;
    int iRowidOff = 0;
................................................................................
** If successful, SQLITE_OK is returned. If an error occurs, some other
** SQLite error code is returned instead.
*/
int sqlite3Fts5IndexInit(sqlite3 *db){
  int rc = sqlite3_create_function(
      db, "fts5_decode", 2, SQLITE_UTF8, 0, fts5DecodeFunction, 0, 0
  );

  if( rc==SQLITE_OK ){
    rc = sqlite3_create_function(
        db, "fts5_decode_none", 2, 
        SQLITE_UTF8, (void*)db, fts5DecodeFunction, 0, 0
    );
  }

  if( rc==SQLITE_OK ){
    rc = sqlite3_create_function(
        db, "fts5_rowid", -1, SQLITE_UTF8, 0, fts5RowidFunction, 0, 0
    );
  }
  return rc;
}

    }
  }
  
  return rc;
}


static sqlite3_stmt *fts5PrepareStatement(
  int *pRc,
  Fts5Config *pConfig, 
  const char *zFmt,
  ...
){
  sqlite3_stmt *pRet = 0;


  va_list ap;
  va_start(ap, zFmt);

  if( *pRc==SQLITE_OK ){
    int rc;
    char *zSql = sqlite3_vmprintf(zFmt, ap);
    if( zSql==0 ){
      rc = SQLITE_NOMEM; 
    }else{
      rc = sqlite3_prepare_v2(pConfig->db, zSql, -1, &pRet, 0);
      if( rc!=SQLITE_OK ){
        *pConfig->pzErrmsg = sqlite3_mprintf("%s", sqlite3_errmsg(pConfig->db));
      }
      sqlite3_free(zSql);
    }
    *pRc = rc;
  }

  va_end(ap);

  return pRet;
} 

static int fts5CursorFirstSorted(Fts5Table *pTab, Fts5Cursor *pCsr, int bDesc){
  Fts5Config *pConfig = pTab->pConfig;
  Fts5Sorter *pSorter;
  int nPhrase;
  int nByte;
  int rc = SQLITE_OK;
  const char *zRank = pCsr->zRank;
  const char *zRankArgs = pCsr->zRankArgs;
  
  nPhrase = sqlite3Fts5ExprPhraseCount(pCsr->pExpr);
  nByte = sizeof(Fts5Sorter) + sizeof(int) * (nPhrase-1);
  pSorter = (Fts5Sorter*)sqlite3_malloc(nByte);
  if( pSorter==0 ) return SQLITE_NOMEM;
................................................................................
  /* TODO: It would be better to have some system for reusing statement
  ** handles here, rather than preparing a new one for each query. But that
  ** is not possible as SQLite reference counts the virtual table objects.
  ** And since the statement required here reads from this very virtual 
  ** table, saving it creates a circular reference.
  **
  ** If SQLite a built-in statement cache, this wouldn't be a problem. */
  pSorter->pStmt = fts5PrepareStatement(&rc, pConfig,
      "SELECT rowid, rank FROM %Q.%Q ORDER BY %s(%s%s%s) %s",
      pConfig->zDb, pConfig->zName, zRank, pConfig->zName,
      (zRankArgs ? ", " : ""),
      (zRankArgs ? zRankArgs : ""),
      bDesc ? "DESC" : "ASC"
  );

................................................................................
  sqlite3_value **apVal, 
  sqlite3_int64 *piRowid
){
  int rc = SQLITE_OK;
  int eType1 = sqlite3_value_type(apVal[1]);
  if( eType1==SQLITE_INTEGER ){
    sqlite3_int64 iDel = sqlite3_value_int64(apVal[1]);
    rc = sqlite3Fts5StorageSpecialDelete(pTab->pStorage, iDel, &apVal[2]);
  }
  return rc;
}

static void fts5StorageInsert(
  int *pRc, 
  Fts5Table *pTab, 
................................................................................
      );
      rc = SQLITE_ERROR;
    }

    /* Case 1: DELETE */
    else if( nArg==1 ){
      i64 iDel = sqlite3_value_int64(apVal[0]);  /* Rowid to delete */
      rc = sqlite3Fts5StorageDelete(pTab->pStorage, iDel);
    }

    /* Case 2: INSERT */
    else if( eType0!=SQLITE_INTEGER ){     
      /* If this is a REPLACE, first remove the current entry (if any) */
      if( eConflict==SQLITE_REPLACE 
       && sqlite3_value_type(apVal[1])==SQLITE_INTEGER 
      ){
        i64 iNew = sqlite3_value_int64(apVal[1]);  /* Rowid to delete */
        rc = sqlite3Fts5StorageDelete(pTab->pStorage, iNew);
      }
      fts5StorageInsert(&rc, pTab, apVal, pRowid);
    }

    /* Case 2: UPDATE */
    else{
      i64 iOld = sqlite3_value_int64(apVal[0]);  /* Old rowid */
      i64 iNew = sqlite3_value_int64(apVal[1]);  /* New rowid */
      if( iOld!=iNew ){
        if( eConflict==SQLITE_REPLACE ){
          rc = sqlite3Fts5StorageDelete(pTab->pStorage, iOld);
          if( rc==SQLITE_OK ){
            rc = sqlite3Fts5StorageDelete(pTab->pStorage, iNew);
          }
          fts5StorageInsert(&rc, pTab, apVal, pRowid);
        }else{
          rc = sqlite3Fts5StorageContentInsert(pTab->pStorage, apVal, pRowid);
          if( rc==SQLITE_OK ){
            rc = sqlite3Fts5StorageDelete(pTab->pStorage, iOld);
          }
          if( rc==SQLITE_OK ){
            rc = sqlite3Fts5StorageIndexInsert(pTab->pStorage, apVal, *pRowid);
          }
        }
      }else{
        rc = sqlite3Fts5StorageDelete(pTab->pStorage, iOld);
        fts5StorageInsert(&rc, pTab, apVal, pRowid);
      }
    }
  }

  pTab->pConfig->pzErrmsg = 0;
  return rc;
................................................................................
    int i;

    /* Initialize all iterators */
    for(i=0; i<nIter && rc==SQLITE_OK; i++){
      const u8 *a;
      int n; 
      rc = fts5CsrPoslist(pCsr, i, &a, &n);

      sqlite3Fts5PoslistReaderInit(a, n, &aIter[i]);

    }

    if( rc==SQLITE_OK ){
      while( 1 ){
        int *aInst;
        int iBest = -1;
        for(i=0; i<nIter; i++){
................................................................................
  int *piCol
){
  int rc = SQLITE_OK;
  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
  Fts5Config *pConfig = ((Fts5Table*)(pCsr->base.pVtab))->pConfig;

  if( pConfig->eDetail==FTS5_DETAIL_COLUMNS ){

    int n;





    rc = sqlite3Fts5ExprPhraseCollist(pCsr->pExpr, iPhrase, &pIter->a, &n);

    if( rc==SQLITE_OK ){
      pIter->b = &pIter->a[n];
      *piCol = 0;
      fts5ApiPhraseNextColumn(pCtx, pIter, piCol);
    }
  }else{
    int n;

    }
  }
  
  return rc;
}


static int fts5PrepareStatement(
  sqlite3_stmt **ppStmt,
  Fts5Config *pConfig, 
  const char *zFmt,
  ...
){
  sqlite3_stmt *pRet = 0;
  int rc;
  char *zSql;
  va_list ap;



  va_start(ap, zFmt);
  zSql = sqlite3_vmprintf(zFmt, ap);
  if( zSql==0 ){
    rc = SQLITE_NOMEM; 
  }else{
    rc = sqlite3_prepare_v2(pConfig->db, zSql, -1, &pRet, 0);
    if( rc!=SQLITE_OK ){
      *pConfig->pzErrmsg = sqlite3_mprintf("%s", sqlite3_errmsg(pConfig->db));
    }
    sqlite3_free(zSql);


  }

  va_end(ap);
  *ppStmt = pRet;
  return rc;
} 

static int fts5CursorFirstSorted(Fts5Table *pTab, Fts5Cursor *pCsr, int bDesc){
  Fts5Config *pConfig = pTab->pConfig;
  Fts5Sorter *pSorter;
  int nPhrase;
  int nByte;
  int rc;
  const char *zRank = pCsr->zRank;
  const char *zRankArgs = pCsr->zRankArgs;
  
  nPhrase = sqlite3Fts5ExprPhraseCount(pCsr->pExpr);
  nByte = sizeof(Fts5Sorter) + sizeof(int) * (nPhrase-1);
  pSorter = (Fts5Sorter*)sqlite3_malloc(nByte);
  if( pSorter==0 ) return SQLITE_NOMEM;
................................................................................
  /* TODO: It would be better to have some system for reusing statement
  ** handles here, rather than preparing a new one for each query. But that
  ** is not possible as SQLite reference counts the virtual table objects.
  ** And since the statement required here reads from this very virtual 
  ** table, saving it creates a circular reference.
  **
  ** If SQLite a built-in statement cache, this wouldn't be a problem. */
  rc = fts5PrepareStatement(&pSorter->pStmt, pConfig,
      "SELECT rowid, rank FROM %Q.%Q ORDER BY %s(%s%s%s) %s",
      pConfig->zDb, pConfig->zName, zRank, pConfig->zName,
      (zRankArgs ? ", " : ""),
      (zRankArgs ? zRankArgs : ""),
      bDesc ? "DESC" : "ASC"
  );

................................................................................
  sqlite3_value **apVal, 
  sqlite3_int64 *piRowid
){
  int rc = SQLITE_OK;
  int eType1 = sqlite3_value_type(apVal[1]);
  if( eType1==SQLITE_INTEGER ){
    sqlite3_int64 iDel = sqlite3_value_int64(apVal[1]);
    rc = sqlite3Fts5StorageDelete(pTab->pStorage, iDel, &apVal[2]);
  }
  return rc;
}

static void fts5StorageInsert(
  int *pRc, 
  Fts5Table *pTab, 
................................................................................
      );
      rc = SQLITE_ERROR;
    }

    /* Case 1: DELETE */
    else if( nArg==1 ){
      i64 iDel = sqlite3_value_int64(apVal[0]);  /* Rowid to delete */
      rc = sqlite3Fts5StorageDelete(pTab->pStorage, iDel, 0);
    }

    /* Case 2: INSERT */
    else if( eType0!=SQLITE_INTEGER ){     
      /* If this is a REPLACE, first remove the current entry (if any) */
      if( eConflict==SQLITE_REPLACE 
       && sqlite3_value_type(apVal[1])==SQLITE_INTEGER 
      ){
        i64 iNew = sqlite3_value_int64(apVal[1]);  /* Rowid to delete */
        rc = sqlite3Fts5StorageDelete(pTab->pStorage, iNew, 0);
      }
      fts5StorageInsert(&rc, pTab, apVal, pRowid);
    }

    /* Case 2: UPDATE */
    else{
      i64 iOld = sqlite3_value_int64(apVal[0]);  /* Old rowid */
      i64 iNew = sqlite3_value_int64(apVal[1]);  /* New rowid */
      if( iOld!=iNew ){
        if( eConflict==SQLITE_REPLACE ){
          rc = sqlite3Fts5StorageDelete(pTab->pStorage, iOld, 0);
          if( rc==SQLITE_OK ){
            rc = sqlite3Fts5StorageDelete(pTab->pStorage, iNew, 0);
          }
          fts5StorageInsert(&rc, pTab, apVal, pRowid);
        }else{
          rc = sqlite3Fts5StorageContentInsert(pTab->pStorage, apVal, pRowid);
          if( rc==SQLITE_OK ){
            rc = sqlite3Fts5StorageDelete(pTab->pStorage, iOld, 0);
          }
          if( rc==SQLITE_OK ){
            rc = sqlite3Fts5StorageIndexInsert(pTab->pStorage, apVal, *pRowid);
          }
        }
      }else{
        rc = sqlite3Fts5StorageDelete(pTab->pStorage, iOld, 0);
        fts5StorageInsert(&rc, pTab, apVal, pRowid);
      }
    }
  }

  pTab->pConfig->pzErrmsg = 0;
  return rc;
................................................................................
    int i;

    /* Initialize all iterators */
    for(i=0; i<nIter && rc==SQLITE_OK; i++){
      const u8 *a;
      int n; 
      rc = fts5CsrPoslist(pCsr, i, &a, &n);
      if( rc==SQLITE_OK ){
        sqlite3Fts5PoslistReaderInit(a, n, &aIter[i]);
      }
    }

    if( rc==SQLITE_OK ){
      while( 1 ){
        int *aInst;
        int iBest = -1;
        for(i=0; i<nIter; i++){
................................................................................
  int *piCol
){
  int rc = SQLITE_OK;
  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
  Fts5Config *pConfig = ((Fts5Table*)(pCsr->base.pVtab))->pConfig;

  if( pConfig->eDetail==FTS5_DETAIL_COLUMNS ){
    Fts5Sorter *pSorter = pCsr->pSorter;
    int n;
    if( pSorter ){
      int i1 = (iPhrase==0 ? 0 : pSorter->aIdx[iPhrase-1]);
      n = pSorter->aIdx[iPhrase] - i1;
      pIter->a = &pSorter->aPoslist[i1];
    }else{
      rc = sqlite3Fts5ExprPhraseCollist(pCsr->pExpr, iPhrase, &pIter->a, &n);
    }
    if( rc==SQLITE_OK ){
      pIter->b = &pIter->a[n];
      *piCol = 0;
      fts5ApiPhraseNextColumn(pCtx, pIter, piCol);
    }
  }else{
    int n;

}

/*
** If a row with rowid iDel is present in the %_content table, add the
** delete-markers to the FTS index necessary to delete it. Do not actually
** remove the %_content row at this time though.
*/
static int fts5StorageDeleteFromIndex(Fts5Storage *p, i64 iDel){




  Fts5Config *pConfig = p->pConfig;
  sqlite3_stmt *pSeek;            /* SELECT to read row iDel from %_data */
  int rc;                         /* Return code */





  rc = fts5StorageGetStmt(p, FTS5_STMT_LOOKUP, &pSeek, 0);
  if( rc==SQLITE_OK ){
    int rc2;
    sqlite3_bind_int64(pSeek, 1, iDel);
    if( sqlite3_step(pSeek)==SQLITE_ROW ){
      int iCol;
      Fts5InsertCtx ctx;




      ctx.pStorage = p;
      ctx.iCol = -1;
      rc = sqlite3Fts5IndexBeginWrite(p->pIndex, 1, iDel);
      for(iCol=1; rc==SQLITE_OK && iCol<=pConfig->nCol; iCol++){
        if( pConfig->abUnindexed[iCol-1] ) continue;
        ctx.szCol = 0;
        rc = sqlite3Fts5Tokenize(pConfig, 
            FTS5_TOKENIZE_DOCUMENT,



            (const char*)sqlite3_column_text(pSeek, iCol),
            sqlite3_column_bytes(pSeek, iCol),
            (void*)&ctx,






            fts5StorageInsertCallback
        );
        p->aTotalSize[iCol-1] -= (i64)ctx.szCol;
      }

      p->nTotalRow--;
    }
    rc2 = sqlite3_reset(pSeek);
    if( rc==SQLITE_OK ) rc = rc2;
  }

  return rc;
}


/*
** Insert a record into the %_docsize table. Specifically, do:
**
................................................................................

  return rc;
}

/*
** Remove a row from the FTS table.
*/
int sqlite3Fts5StorageDelete(Fts5Storage *p, i64 iDel){
  Fts5Config *pConfig = p->pConfig;
  int rc;
  sqlite3_stmt *pDel = 0;


  rc = fts5StorageLoadTotals(p, 1);

  /* Delete the index records */
  if( rc==SQLITE_OK ){
    rc = fts5StorageDeleteFromIndex(p, iDel);
  }

  /* Delete the %_docsize record */
  if( rc==SQLITE_OK && pConfig->bColumnsize ){
    rc = fts5StorageGetStmt(p, FTS5_STMT_DELETE_DOCSIZE, &pDel, 0);
    if( rc==SQLITE_OK ){
      sqlite3_bind_int64(pDel, 1, iDel);
................................................................................
  }

  /* Delete the %_content record */
  if( pConfig->eContent==FTS5_CONTENT_NORMAL ){
    if( rc==SQLITE_OK ){
      rc = fts5StorageGetStmt(p, FTS5_STMT_DELETE_CONTENT, &pDel, 0);
    }
    if( rc==SQLITE_OK ){
      sqlite3_bind_int64(pDel, 1, iDel);
      sqlite3_step(pDel);
      rc = sqlite3_reset(pDel);
    }
  }

  /* Write the averages record */
  if( rc==SQLITE_OK ){
    rc = fts5StorageSaveTotals(p);
  }

  return rc;
}

int sqlite3Fts5StorageSpecialDelete(
  Fts5Storage *p, 
  i64 iDel, 
  sqlite3_value **apVal
){
  Fts5Config *pConfig = p->pConfig;
  int rc;
  sqlite3_stmt *pDel = 0;

  assert( pConfig->eContent!=FTS5_CONTENT_NORMAL );
  rc = fts5StorageLoadTotals(p, 1);

  /* Delete the index records */
  if( rc==SQLITE_OK ){
    int iCol;
    Fts5InsertCtx ctx;
    ctx.pStorage = p;
    ctx.iCol = -1;

    rc = sqlite3Fts5IndexBeginWrite(p->pIndex, 1, iDel);
    for(iCol=0; rc==SQLITE_OK && iCol<pConfig->nCol; iCol++){
      if( pConfig->abUnindexed[iCol] ) continue;
      ctx.szCol = 0;
      rc = sqlite3Fts5Tokenize(pConfig, 
        FTS5_TOKENIZE_DOCUMENT,
        (const char*)sqlite3_value_text(apVal[iCol]),
        sqlite3_value_bytes(apVal[iCol]),
        (void*)&ctx,
        fts5StorageInsertCallback
      );
      p->aTotalSize[iCol] -= (i64)ctx.szCol;
    }
    p->nTotalRow--;
  }

  /* Delete the %_docsize record */
  if( pConfig->bColumnsize ){
    if( rc==SQLITE_OK ){
      rc = fts5StorageGetStmt(p, FTS5_STMT_DELETE_DOCSIZE, &pDel, 0);
    }
    if( rc==SQLITE_OK ){
      sqlite3_bind_int64(pDel, 1, iDel);
      sqlite3_step(pDel);
      rc = sqlite3_reset(pDel);
    }
  }

}

/*
** If a row with rowid iDel is present in the %_content table, add the
** delete-markers to the FTS index necessary to delete it. Do not actually
** remove the %_content row at this time though.
*/
static int fts5StorageDeleteFromIndex(
  Fts5Storage *p, 
  i64 iDel, 
  sqlite3_value **apVal
){
  Fts5Config *pConfig = p->pConfig;
  sqlite3_stmt *pSeek = 0;        /* SELECT to read row iDel from %_data */
  int rc;                         /* Return code */
  int rc2;                        /* sqlite3_reset() return code */
  int iCol;
  Fts5InsertCtx ctx;

  if( apVal==0 ){
    rc = fts5StorageGetStmt(p, FTS5_STMT_LOOKUP, &pSeek, 0);
    if( rc!=SQLITE_OK ) return rc;

    sqlite3_bind_int64(pSeek, 1, iDel);
    if( sqlite3_step(pSeek)!=SQLITE_ROW ){


      return sqlite3_reset(pSeek);
    }
  }

  ctx.pStorage = p;
  ctx.iCol = -1;
  rc = sqlite3Fts5IndexBeginWrite(p->pIndex, 1, iDel);
  for(iCol=1; rc==SQLITE_OK && iCol<=pConfig->nCol; iCol++){
    if( pConfig->abUnindexed[iCol-1]==0 ){



      const char *zText;
      int nText;
      if( pSeek ){
        zText = (const char*)sqlite3_column_text(pSeek, iCol);
        nText = sqlite3_column_bytes(pSeek, iCol);

      }else{
        zText = (const char*)sqlite3_value_text(apVal[iCol-1]);
        nText = sqlite3_value_bytes(apVal[iCol-1]);
      }
      ctx.szCol = 0;
      rc = sqlite3Fts5Tokenize(pConfig, FTS5_TOKENIZE_DOCUMENT, 
          zText, nText, (void*)&ctx, fts5StorageInsertCallback
      );
      p->aTotalSize[iCol-1] -= (i64)ctx.szCol;
    }
  }
  p->nTotalRow--;

  rc2 = sqlite3_reset(pSeek);
  if( rc==SQLITE_OK ) rc = rc2;


  return rc;
}


/*
** Insert a record into the %_docsize table. Specifically, do:
**
................................................................................

  return rc;
}

/*
** Remove a row from the FTS table.
*/
int sqlite3Fts5StorageDelete(Fts5Storage *p, i64 iDel, sqlite3_value **apVal){
  Fts5Config *pConfig = p->pConfig;
  int rc;
  sqlite3_stmt *pDel = 0;

  assert( pConfig->eContent!=FTS5_CONTENT_NORMAL || apVal==0 );
  rc = fts5StorageLoadTotals(p, 1);

  /* Delete the index records */
  if( rc==SQLITE_OK ){
    rc = fts5StorageDeleteFromIndex(p, iDel, apVal);
  }

  /* Delete the %_docsize record */
  if( rc==SQLITE_OK && pConfig->bColumnsize ){
    rc = fts5StorageGetStmt(p, FTS5_STMT_DELETE_DOCSIZE, &pDel, 0);
    if( rc==SQLITE_OK ){
      sqlite3_bind_int64(pDel, 1, iDel);
................................................................................
  }

  /* Delete the %_content record */
  if( pConfig->eContent==FTS5_CONTENT_NORMAL ){
    if( rc==SQLITE_OK ){
      rc = fts5StorageGetStmt(p, FTS5_STMT_DELETE_CONTENT, &pDel, 0);
    }























































    if( rc==SQLITE_OK ){
      sqlite3_bind_int64(pDel, 1, iDel);
      sqlite3_step(pDel);
      rc = sqlite3_reset(pDel);
    }
  }

#ifdef SQLITE_ENABLE_FTS5

#include "fts5.h"
#include <string.h>
#include <assert.h>

extern int sqlite3_fts5_may_be_corrupt;
extern int sqlite3Fts5TestRegisterMatchinfo(sqlite3 *);


/*************************************************************************
** This is a copy of the first part of the SqliteDb structure in 
** tclsqlite.c.  We need it here so that the get_sqlite_pointer routine
** can extract the sqlite3* pointer from an existing Tcl SQLite
** connection.
*/
................................................................................
      Tcl_Obj *pScript = objv[5];
      Fts5PhraseIter iter;

      if( Tcl_GetIntFromObj(interp, objv[2], &iPhrase) ) return TCL_ERROR;
      zColvar = Tcl_GetString(objv[3]);
      zOffvar = Tcl_GetString(objv[4]);

      for(p->pApi->xPhraseFirst(p->pFts, iPhrase, &iter, &iCol, &iOff);
          iCol>=0;



          p->pApi->xPhraseNext(p->pFts, &iter, &iCol, &iOff)
      ){
        Tcl_SetVar2Ex(interp, zColvar, 0, Tcl_NewIntObj(iCol), 0);
        Tcl_SetVar2Ex(interp, zOffvar, 0, Tcl_NewIntObj(iOff), 0);
        rc = Tcl_EvalObjEx(interp, pScript, 0);
        if( rc==TCL_CONTINUE ) rc = TCL_OK;
        if( rc!=TCL_OK ){
          if( rc==TCL_BREAK ) rc = TCL_OK;
          break;
................................................................................
      const char *zColvar;
      Tcl_Obj *pScript = objv[4];
      Fts5PhraseIter iter;

      if( Tcl_GetIntFromObj(interp, objv[2], &iPhrase) ) return TCL_ERROR;
      zColvar = Tcl_GetString(objv[3]);

      for(p->pApi->xPhraseFirstColumn(p->pFts, iPhrase, &iter, &iCol);
          iCol>=0;



          p->pApi->xPhraseNextColumn(p->pFts, &iter, &iCol)
      ){
        Tcl_SetVar2Ex(interp, zColvar, 0, Tcl_NewIntObj(iCol), 0);
        rc = Tcl_EvalObjEx(interp, pScript, 0);
        if( rc==TCL_CONTINUE ) rc = TCL_OK;
        if( rc!=TCL_OK ){
          if( rc==TCL_BREAK ) rc = TCL_OK;
          break;
        }
................................................................................
  rc = sqlite3Fts5TestRegisterMatchinfo(db);
  if( rc!=SQLITE_OK ){
    Tcl_SetResult(interp, (char*)sqlite3ErrName(rc), TCL_VOLATILE);
    return TCL_ERROR;
  }
  return TCL_OK;
}



























/*
** Entry point.
*/
int Fts5tcl_Init(Tcl_Interp *interp){
  static struct Cmd {
    char *zName;
................................................................................
  } aCmd[] = {
    { "sqlite3_fts5_create_tokenizer",   f5tCreateTokenizer, 1 },
    { "sqlite3_fts5_token",              f5tTokenizerReturn, 1 },
    { "sqlite3_fts5_tokenize",           f5tTokenize, 0 },
    { "sqlite3_fts5_create_function",    f5tCreateFunction, 0 },
    { "sqlite3_fts5_may_be_corrupt",     f5tMayBeCorrupt, 0 },
    { "sqlite3_fts5_token_hash",         f5tTokenHash, 0 },
    { "sqlite3_fts5_register_matchinfo", f5tRegisterMatchinfo, 0 }

  };
  int i;
  F5tTokenizerContext *pContext;

  pContext = (F5tTokenizerContext*)ckalloc(sizeof(F5tTokenizerContext));
  memset(pContext, 0, sizeof(*pContext));

#ifdef SQLITE_ENABLE_FTS5

#include "fts5.h"
#include <string.h>
#include <assert.h>

extern int sqlite3_fts5_may_be_corrupt;
extern int sqlite3Fts5TestRegisterMatchinfo(sqlite3*);
extern int sqlite3Fts5TestRegisterTok(sqlite3*, fts5_api*);

/*************************************************************************
** This is a copy of the first part of the SqliteDb structure in 
** tclsqlite.c.  We need it here so that the get_sqlite_pointer routine
** can extract the sqlite3* pointer from an existing Tcl SQLite
** connection.
*/
................................................................................
      Tcl_Obj *pScript = objv[5];
      Fts5PhraseIter iter;

      if( Tcl_GetIntFromObj(interp, objv[2], &iPhrase) ) return TCL_ERROR;
      zColvar = Tcl_GetString(objv[3]);
      zOffvar = Tcl_GetString(objv[4]);

      rc = p->pApi->xPhraseFirst(p->pFts, iPhrase, &iter, &iCol, &iOff);
      if( rc!=SQLITE_OK ){
        Tcl_AppendResult(interp, sqlite3ErrName(rc), 0);
        return TCL_ERROR;
      }
      for( ;iCol>=0; p->pApi->xPhraseNext(p->pFts, &iter, &iCol, &iOff) ){

        Tcl_SetVar2Ex(interp, zColvar, 0, Tcl_NewIntObj(iCol), 0);
        Tcl_SetVar2Ex(interp, zOffvar, 0, Tcl_NewIntObj(iOff), 0);
        rc = Tcl_EvalObjEx(interp, pScript, 0);
        if( rc==TCL_CONTINUE ) rc = TCL_OK;
        if( rc!=TCL_OK ){
          if( rc==TCL_BREAK ) rc = TCL_OK;
          break;
................................................................................
      const char *zColvar;
      Tcl_Obj *pScript = objv[4];
      Fts5PhraseIter iter;

      if( Tcl_GetIntFromObj(interp, objv[2], &iPhrase) ) return TCL_ERROR;
      zColvar = Tcl_GetString(objv[3]);

      rc = p->pApi->xPhraseFirstColumn(p->pFts, iPhrase, &iter, &iCol);
      if( rc!=SQLITE_OK ){
        Tcl_AppendResult(interp, sqlite3ErrName(rc), 0);
        return TCL_ERROR;
      }
      for( ; iCol>=0; p->pApi->xPhraseNextColumn(p->pFts, &iter, &iCol)){

        Tcl_SetVar2Ex(interp, zColvar, 0, Tcl_NewIntObj(iCol), 0);
        rc = Tcl_EvalObjEx(interp, pScript, 0);
        if( rc==TCL_CONTINUE ) rc = TCL_OK;
        if( rc!=TCL_OK ){
          if( rc==TCL_BREAK ) rc = TCL_OK;
          break;
        }
................................................................................
  rc = sqlite3Fts5TestRegisterMatchinfo(db);
  if( rc!=SQLITE_OK ){
    Tcl_SetResult(interp, (char*)sqlite3ErrName(rc), TCL_VOLATILE);
    return TCL_ERROR;
  }
  return TCL_OK;
}

static int f5tRegisterTok(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  int rc;
  sqlite3 *db = 0;
  fts5_api *pApi = 0;

  if( objc!=2 ){
    Tcl_WrongNumArgs(interp, 1, objv, "DB");
    return TCL_ERROR;
  }
  if( f5tDbAndApi(interp, objv[1], &db, &pApi) ){
    return TCL_ERROR;
  }

  rc = sqlite3Fts5TestRegisterTok(db, pApi);
  if( rc!=SQLITE_OK ){
    Tcl_SetResult(interp, (char*)sqlite3ErrName(rc), TCL_VOLATILE);
    return TCL_ERROR;
  }
  return TCL_OK;
}

/*
** Entry point.
*/
int Fts5tcl_Init(Tcl_Interp *interp){
  static struct Cmd {
    char *zName;
................................................................................
  } aCmd[] = {
    { "sqlite3_fts5_create_tokenizer",   f5tCreateTokenizer, 1 },
    { "sqlite3_fts5_token",              f5tTokenizerReturn, 1 },
    { "sqlite3_fts5_tokenize",           f5tTokenize, 0 },
    { "sqlite3_fts5_create_function",    f5tCreateFunction, 0 },
    { "sqlite3_fts5_may_be_corrupt",     f5tMayBeCorrupt, 0 },
    { "sqlite3_fts5_token_hash",         f5tTokenHash, 0 },
    { "sqlite3_fts5_register_matchinfo", f5tRegisterMatchinfo, 0 },
    { "sqlite3_fts5_register_fts5tokenize", f5tRegisterTok, 0 }
  };
  int i;
  F5tTokenizerContext *pContext;

  pContext = (F5tTokenizerContext*)ckalloc(sizeof(F5tTokenizerContext));
  memset(pContext, 0, sizeof(*pContext));

/*
** 2013 Apr 22
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
******************************************************************************
**
** This file contains code for the "fts5tokenize" virtual table module.
** An fts5tokenize virtual table is created as follows:
**
**   CREATE VIRTUAL TABLE <tbl> USING fts5tokenize(
**       <tokenizer-name>, <arg-1>, ...
**   );
**
** The table created has the following schema:
**
**   CREATE TABLE <tbl>(input HIDDEN, token, start, end, position)
**
** When queried, the query must include a WHERE clause of type:
**
**   input = <string>
**
** The virtual table module tokenizes this <string>, using the FTS3 
** tokenizer specified by the arguments to the CREATE VIRTUAL TABLE 
** statement and returns one row for each token in the result. With
** fields set as follows:
**
**   input:   Always set to a copy of <string>
**   token:   A token from the input.
**   start:   Byte offset of the token within the input <string>.
**   end:     Byte offset of the byte immediately following the end of the
**            token within the input string.
**   pos:     Token offset of token within input.
**
*/
#if defined(SQLITE_TEST) && defined(SQLITE_ENABLE_FTS5)

#include <fts5.h>
#include <string.h>
#include <assert.h>

typedef struct Fts5tokTable Fts5tokTable;
typedef struct Fts5tokCursor Fts5tokCursor;
typedef struct Fts5tokRow Fts5tokRow;

/*
** Virtual table structure.
*/
struct Fts5tokTable {
  sqlite3_vtab base;              /* Base class used by SQLite core */
  fts5_tokenizer tok;             /* Tokenizer functions */
  Fts5Tokenizer *pTok;            /* Tokenizer instance */
};

/*
** A container for a rows values.
*/
struct Fts5tokRow {
  char *zToken;
  int iStart;
  int iEnd;
  int iPos;
};

/*
** Virtual table cursor structure.
*/
struct Fts5tokCursor {
  sqlite3_vtab_cursor base;       /* Base class used by SQLite core */
  int iRowid;                     /* Current 'rowid' value */
  char *zInput;                   /* Input string */
  int nRow;                       /* Number of entries in aRow[] */
  Fts5tokRow *aRow;               /* Array of rows to return */
};

static void fts5tokDequote(char *z){
  char q = z[0];

  if( q=='[' || q=='\'' || q=='"' || q=='`' ){
    int iIn = 1;
    int iOut = 0;
    if( q=='[' ) q = ']';  

    while( z[iIn] ){
      if( z[iIn]==q ){
        if( z[iIn+1]!=q ){
          /* Character iIn was the close quote. */
          iIn++;
          break;
        }else{
          /* Character iIn and iIn+1 form an escaped quote character. Skip
          ** the input cursor past both and copy a single quote character 
          ** to the output buffer. */
          iIn += 2;
          z[iOut++] = q;
        }
      }else{
        z[iOut++] = z[iIn++];
      }
    }

    z[iOut] = '\0';
  }
}

/*
** The second argument, argv[], is an array of pointers to nul-terminated
** strings. This function makes a copy of the array and strings into a 
** single block of memory. It then dequotes any of the strings that appear
** to be quoted.
**
** If successful, output parameter *pazDequote is set to point at the
** array of dequoted strings and SQLITE_OK is returned. The caller is
** responsible for eventually calling sqlite3_free() to free the array
** in this case. Or, if an error occurs, an SQLite error code is returned.
** The final value of *pazDequote is undefined in this case.
*/
static int fts5tokDequoteArray(
  int argc,                       /* Number of elements in argv[] */
  const char * const *argv,       /* Input array */
  char ***pazDequote              /* Output array */
){
  int rc = SQLITE_OK;             /* Return code */
  if( argc==0 ){
    *pazDequote = 0;
  }else{
    int i;
    int nByte = 0;
    char **azDequote;

    for(i=0; i<argc; i++){
      nByte += (int)(strlen(argv[i]) + 1);
    }

    *pazDequote = azDequote = sqlite3_malloc(sizeof(char *)*argc + nByte);
    if( azDequote==0 ){
      rc = SQLITE_NOMEM;
    }else{
      char *pSpace = (char *)&azDequote[argc];
      for(i=0; i<argc; i++){
        int n = (int)strlen(argv[i]);
        azDequote[i] = pSpace;
        memcpy(pSpace, argv[i], n+1);
        fts5tokDequote(pSpace);
        pSpace += (n+1);
      }
    }
  }

  return rc;
}

/*
** Schema of the tokenizer table.
*/
#define FTS3_TOK_SCHEMA "CREATE TABLE x(input HIDDEN, token, start, end, position)"

/*
** This function does all the work for both the xConnect and xCreate methods.
** These tables have no persistent representation of their own, so xConnect
** and xCreate are identical operations.
**
**   argv[0]: module name
**   argv[1]: database name 
**   argv[2]: table name
**   argv[3]: first argument (tokenizer name)
*/
static int fts5tokConnectMethod(
  sqlite3 *db,                    /* Database connection */
  void *pCtx,                     /* Pointer to fts5_api object */
  int argc,                       /* Number of elements in argv array */
  const char * const *argv,       /* xCreate/xConnect argument array */
  sqlite3_vtab **ppVtab,          /* OUT: New sqlite3_vtab object */
  char **pzErr                    /* OUT: sqlite3_malloc'd error message */
){
  fts5_api *pApi = (fts5_api*)pCtx;
  Fts5tokTable *pTab = 0;
  int rc;
  char **azDequote = 0;
  int nDequote;

  rc = sqlite3_declare_vtab(db, 
       "CREATE TABLE x(input HIDDEN, token, start, end, position)"
  );

  if( rc==SQLITE_OK ){
    nDequote = argc-3;
    rc = fts5tokDequoteArray(nDequote, &argv[3], &azDequote);
  }

  if( rc==SQLITE_OK ){
    pTab = (Fts5tokTable*)sqlite3_malloc(sizeof(Fts5tokTable));
    if( pTab==0 ){
      rc = SQLITE_NOMEM;
    }else{
      memset(pTab, 0, sizeof(Fts5tokTable));
    }
  }

  if( rc==SQLITE_OK ){
    void *pTokCtx = 0;
    const char *zModule = 0;
    if( nDequote>0 ){
      zModule = azDequote[0];
    }

    rc = pApi->xFindTokenizer(pApi, zModule, &pTokCtx, &pTab->tok);
    if( rc==SQLITE_OK ){
      const char **azArg = (const char **)&azDequote[1];
      int nArg = nDequote>0 ? nDequote-1 : 0;
      rc = pTab->tok.xCreate(pTokCtx, azArg, nArg, &pTab->pTok);
    }
  }

  if( rc!=SQLITE_OK ){
    sqlite3_free(pTab);
    pTab = 0;
  }

  *ppVtab = (sqlite3_vtab*)pTab;
  sqlite3_free(azDequote);
  return rc;
}

/*
** This function does the work for both the xDisconnect and xDestroy methods.
** These tables have no persistent representation of their own, so xDisconnect
** and xDestroy are identical operations.
*/
static int fts5tokDisconnectMethod(sqlite3_vtab *pVtab){
  Fts5tokTable *pTab = (Fts5tokTable *)pVtab;
  if( pTab->pTok ){
    pTab->tok.xDelete(pTab->pTok);
  }
  sqlite3_free(pTab);
  return SQLITE_OK;
}

/*
** xBestIndex - Analyze a WHERE and ORDER BY clause.
*/
static int fts5tokBestIndexMethod(
  sqlite3_vtab *pVTab, 
  sqlite3_index_info *pInfo
){
  int i;

  for(i=0; i<pInfo->nConstraint; i++){
    if( pInfo->aConstraint[i].usable 
     && pInfo->aConstraint[i].iColumn==0 
     && pInfo->aConstraint[i].op==SQLITE_INDEX_CONSTRAINT_EQ 
    ){
      pInfo->idxNum = 1;
      pInfo->aConstraintUsage[i].argvIndex = 1;
      pInfo->aConstraintUsage[i].omit = 1;
      pInfo->estimatedCost = 1;
      return SQLITE_OK;
    }
  }

  pInfo->idxNum = 0;
  assert( pInfo->estimatedCost>1000000.0 );

  return SQLITE_OK;
}

/*
** xOpen - Open a cursor.
*/
static int fts5tokOpenMethod(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCsr){
  Fts5tokCursor *pCsr;

  pCsr = (Fts5tokCursor *)sqlite3_malloc(sizeof(Fts5tokCursor));
  if( pCsr==0 ){
    return SQLITE_NOMEM;
  }
  memset(pCsr, 0, sizeof(Fts5tokCursor));

  *ppCsr = (sqlite3_vtab_cursor *)pCsr;
  return SQLITE_OK;
}

/*
** Reset the tokenizer cursor passed as the only argument. As if it had
** just been returned by fts5tokOpenMethod().
*/
static void fts5tokResetCursor(Fts5tokCursor *pCsr){
  int i;
  for(i=0; i<pCsr->nRow; i++){
    sqlite3_free(pCsr->aRow[i].zToken);
  }
  sqlite3_free(pCsr->zInput);
  sqlite3_free(pCsr->aRow);
  pCsr->zInput = 0;
  pCsr->aRow = 0;
  pCsr->nRow = 0;
  pCsr->iRowid = 0;
}

/*
** xClose - Close a cursor.
*/
static int fts5tokCloseMethod(sqlite3_vtab_cursor *pCursor){
  Fts5tokCursor *pCsr = (Fts5tokCursor *)pCursor;
  fts5tokResetCursor(pCsr);
  sqlite3_free(pCsr);
  return SQLITE_OK;
}

/*
** xNext - Advance the cursor to the next row, if any.
*/
static int fts5tokNextMethod(sqlite3_vtab_cursor *pCursor){
  Fts5tokCursor *pCsr = (Fts5tokCursor *)pCursor;
  pCsr->iRowid++;
  return SQLITE_OK;
}

static int fts5tokCb(
  void *pCtx,         /* Pointer to Fts5tokCursor */
  int tflags,         /* Mask of FTS5_TOKEN_* flags */
  const char *pToken, /* Pointer to buffer containing token */
  int nToken,         /* Size of token in bytes */
  int iStart,         /* Byte offset of token within input text */
  int iEnd            /* Byte offset of end of token within input text */
){
  Fts5tokCursor *pCsr = (Fts5tokCursor*)pCtx;
  Fts5tokRow *pRow;

  if( (pCsr->nRow & (pCsr->nRow-1))==0 ){
    int nNew = pCsr->nRow ? pCsr->nRow*2 : 32;
    Fts5tokRow *aNew;
    aNew = (Fts5tokRow*)sqlite3_realloc(pCsr->aRow, nNew*sizeof(Fts5tokRow));
    if( aNew==0 ) return SQLITE_NOMEM;
    memset(&aNew[pCsr->nRow], 0, sizeof(Fts5tokRow)*(nNew-pCsr->nRow));
    pCsr->aRow = aNew;
  }

  pRow = &pCsr->aRow[pCsr->nRow];
  pRow->iStart = iStart;
  pRow->iEnd = iEnd;
  if( pCsr->nRow ){
    pRow->iPos = pRow[-1].iPos + ((tflags & FTS5_TOKEN_COLOCATED) ? 0 : 1);
  }
  pRow->zToken = sqlite3_malloc(nToken+1);
  if( pRow->zToken==0 ) return SQLITE_NOMEM;
  memcpy(pRow->zToken, pToken, nToken);
  pRow->zToken[nToken] = 0;
  pCsr->nRow++;

  return SQLITE_OK;
}

/*
** xFilter - Initialize a cursor to point at the start of its data.
*/
static int fts5tokFilterMethod(
  sqlite3_vtab_cursor *pCursor,   /* The cursor used for this query */
  int idxNum,                     /* Strategy index */
  const char *idxStr,             /* Unused */
  int nVal,                       /* Number of elements in apVal */
  sqlite3_value **apVal           /* Arguments for the indexing scheme */
){
  int rc = SQLITE_ERROR;
  Fts5tokCursor *pCsr = (Fts5tokCursor *)pCursor;
  Fts5tokTable *pTab = (Fts5tokTable *)(pCursor->pVtab);

  fts5tokResetCursor(pCsr);
  if( idxNum==1 ){
    const char *zByte = (const char *)sqlite3_value_text(apVal[0]);
    int nByte = sqlite3_value_bytes(apVal[0]);
    pCsr->zInput = sqlite3_malloc(nByte+1);
    if( pCsr->zInput==0 ){
      rc = SQLITE_NOMEM;
    }else{
      memcpy(pCsr->zInput, zByte, nByte);
      pCsr->zInput[nByte] = 0;
      rc = pTab->tok.xTokenize(
          pTab->pTok, (void*)pCsr, 0, zByte, nByte, fts5tokCb
      );
    }
  }

  if( rc!=SQLITE_OK ) return rc;
  return fts5tokNextMethod(pCursor);
}

/*
** xEof - Return true if the cursor is at EOF, or false otherwise.
*/
static int fts5tokEofMethod(sqlite3_vtab_cursor *pCursor){
  Fts5tokCursor *pCsr = (Fts5tokCursor *)pCursor;
  return (pCsr->iRowid>pCsr->nRow);
}

/*
** xColumn - Return a column value.
*/
static int fts5tokColumnMethod(
  sqlite3_vtab_cursor *pCursor,   /* Cursor to retrieve value from */
  sqlite3_context *pCtx,          /* Context for sqlite3_result_xxx() calls */
  int iCol                        /* Index of column to read value from */
){
  Fts5tokCursor *pCsr = (Fts5tokCursor *)pCursor;
  Fts5tokRow *pRow = &pCsr->aRow[pCsr->iRowid-1];

  /* CREATE TABLE x(input, token, start, end, position) */
  switch( iCol ){
    case 0:
      sqlite3_result_text(pCtx, pCsr->zInput, -1, SQLITE_TRANSIENT);
      break;
    case 1:
      sqlite3_result_text(pCtx, pRow->zToken, -1, SQLITE_TRANSIENT);
      break;
    case 2:
      sqlite3_result_int(pCtx, pRow->iStart);
      break;
    case 3:
      sqlite3_result_int(pCtx, pRow->iEnd);
      break;
    default:
      assert( iCol==4 );
      sqlite3_result_int(pCtx, pRow->iPos);
      break;
  }
  return SQLITE_OK;
}

/*
** xRowid - Return the current rowid for the cursor.
*/
static int fts5tokRowidMethod(
  sqlite3_vtab_cursor *pCursor,   /* Cursor to retrieve value from */
  sqlite_int64 *pRowid            /* OUT: Rowid value */
){
  Fts5tokCursor *pCsr = (Fts5tokCursor *)pCursor;
  *pRowid = (sqlite3_int64)pCsr->iRowid;
  return SQLITE_OK;
}

/*
** Register the fts5tok module with database connection db. Return SQLITE_OK
** if successful or an error code if sqlite3_create_module() fails.
*/
int sqlite3Fts5TestRegisterTok(sqlite3 *db, fts5_api *pApi){
  static const sqlite3_module fts5tok_module = {
     0,                           /* iVersion      */
     fts5tokConnectMethod,        /* xCreate       */
     fts5tokConnectMethod,        /* xConnect      */
     fts5tokBestIndexMethod,      /* xBestIndex    */
     fts5tokDisconnectMethod,     /* xDisconnect   */
     fts5tokDisconnectMethod,     /* xDestroy      */
     fts5tokOpenMethod,           /* xOpen         */
     fts5tokCloseMethod,          /* xClose        */
     fts5tokFilterMethod,         /* xFilter       */
     fts5tokNextMethod,           /* xNext         */
     fts5tokEofMethod,            /* xEof          */
     fts5tokColumnMethod,         /* xColumn       */
     fts5tokRowidMethod,          /* xRowid        */
     0,                           /* xUpdate       */
     0,                           /* xBegin        */
     0,                           /* xSync         */
     0,                           /* xCommit       */
     0,                           /* xRollback     */
     0,                           /* xFindFunction */
     0,                           /* xRename       */
     0,                           /* xSavepoint    */
     0,                           /* xRelease      */
     0                            /* xRollbackTo   */
  };
  int rc;                         /* Return code */

  rc = sqlite3_create_module(db, "fts5tokenize", &fts5tok_module, (void*)pApi);
  return rc;
}

#endif /* defined(SQLITE_TEST) && defined(SQLITE_ENABLE_FTS5) */

                pCsr->aDoc[0]++;
              }else{
                int iCol = -1;
                while( 0==sqlite3Fts5PoslistNext64(pPos, nPos, &iOff, &iPos) ){
                  int ii = FTS5_POS2COLUMN(iPos);
                  pCsr->aCnt[ii]++;
                  if( iCol!=ii ){




                    pCsr->aDoc[ii]++;
                    iCol = ii;
                  }
                }
              }
            }
            break;
................................................................................
              pCsr->aDoc[0]++;
            }else{
              Fts5Buffer buf = {0, 0, 0};
              rc = sqlite3Fts5IterPoslistBuffer(pCsr->pIter, &buf);
              if( rc==SQLITE_OK ){
                while( 0==sqlite3Fts5PoslistNext64(buf.p, buf.n, &iOff,&iPos) ){
                  assert_nc( iPos>=0 && iPos<nCol );




                  if( iPos<nCol ) pCsr->aDoc[iPos]++;
                }
              }
              sqlite3Fts5BufferFree(&buf);
            }
            break;

          default: 
................................................................................
          }
          if( sqlite3Fts5IterEof(pCsr->pIter) ) break;
        }
      }
    }
  }

  if( pCsr->bEof==0 && pTab->eType==FTS5_VOCAB_COL ){
    while( pCsr->aDoc[pCsr->iCol]==0 ) pCsr->iCol++;
    assert( pCsr->iCol<pCsr->pConfig->nCol );
  }
  return rc;
}

/*

                pCsr->aDoc[0]++;
              }else{
                int iCol = -1;
                while( 0==sqlite3Fts5PoslistNext64(pPos, nPos, &iOff, &iPos) ){
                  int ii = FTS5_POS2COLUMN(iPos);
                  pCsr->aCnt[ii]++;
                  if( iCol!=ii ){
                    if( ii>=nCol ){
                      rc = FTS5_CORRUPT;
                      break;
                    }
                    pCsr->aDoc[ii]++;
                    iCol = ii;
                  }
                }
              }
            }
            break;
................................................................................
              pCsr->aDoc[0]++;
            }else{
              Fts5Buffer buf = {0, 0, 0};
              rc = sqlite3Fts5IterPoslistBuffer(pCsr->pIter, &buf);
              if( rc==SQLITE_OK ){
                while( 0==sqlite3Fts5PoslistNext64(buf.p, buf.n, &iOff,&iPos) ){
                  assert_nc( iPos>=0 && iPos<nCol );
                  if( iPos>=nCol ){
                    rc = FTS5_CORRUPT;
                    break;
                  }
                  pCsr->aDoc[iPos]++;
                }
              }
              sqlite3Fts5BufferFree(&buf);
            }
            break;

          default: 
................................................................................
          }
          if( sqlite3Fts5IterEof(pCsr->pIter) ) break;
        }
      }
    }
  }

  if( rc==SQLITE_OK && pCsr->bEof==0 && pTab->eType==FTS5_VOCAB_COL ){
    while( pCsr->aDoc[pCsr->iCol]==0 ) pCsr->iCol++;
    assert( pCsr->iCol<pCsr->pConfig->nCol );
  }
  return rc;
}

/*

#***********************************************************************
#

if {![info exists testdir]} {
  set testdir [file join [file dirname [info script]] .. .. .. test]
}
source $testdir/tester.tcl






catch { 
  sqlite3_fts5_may_be_corrupt 0 
  reset_db
}







proc fts5_test_poslist {cmd} {
  set res [list]
  for {set i 0} {$i < [$cmd xInstCount]} {incr i} {
    lappend res [string map {{ } .} [$cmd xInst $i]]
  }
  set res
................................................................................
  }

  foreach {rowid poslist collist} [fts5_query_data $expr $tbl $order $dict] {
    lappend res $rowid $poslist
  }
  set res
}

















#-------------------------------------------------------------------------
#

# This command will only work inside a [foreach_detail_mode] block. It tests
# whether or not expression $expr run on FTS5 table $tbl is supported by
# the current mode. If so, 1 is returned. If not, 0.
................................................................................
  nearset_rf $aCol {*}$args
  if {[lsearch $args -col]>=0} { 
    set ::expr_not_ok 1
  }
  list
}

#***********************************************************************
#

if {![info exists testdir]} {
  set testdir [file join [file dirname [info script]] .. .. .. test]
}
source $testdir/tester.tcl

ifcapable !fts5 {
  finish_test
  return
}

catch { 
  sqlite3_fts5_may_be_corrupt 0 
  reset_db
}

# If SQLITE_ENABLE_FTS5 is not defined, skip this test.
ifcapable !fts5 {
  finish_test
  return
}

proc fts5_test_poslist {cmd} {
  set res [list]
  for {set i 0} {$i < [$cmd xInstCount]} {incr i} {
    lappend res [string map {{ } .} [$cmd xInst $i]]
  }
  set res
................................................................................
  }

  foreach {rowid poslist collist} [fts5_query_data $expr $tbl $order $dict] {
    lappend res $rowid $poslist
  }
  set res
}

proc fts5_collist_data {expr tbl {order ASC} {aDictVar ""}} {
  set res [list]

  if {$aDictVar!=""} {
    upvar $aDictVar aDict
    set dict aDict
  } else {
    set dict ""
  }

  foreach {rowid poslist collist} [fts5_query_data $expr $tbl $order $dict] {
    lappend res $rowid $collist
  }
  set res
}

#-------------------------------------------------------------------------
#

# This command will only work inside a [foreach_detail_mode] block. It tests
# whether or not expression $expr run on FTS5 table $tbl is supported by
# the current mode. If so, 1 is returned. If not, 0.
................................................................................
  nearset_rf $aCol {*}$args
  if {[lsearch $args -col]>=0} { 
    set ::expr_not_ok 1
  }
  list
}


#-------------------------------------------------------------------------
# Code for a simple Tcl tokenizer that supports synonyms at query time.
#
proc tclnum_tokenize {mode tflags text} {
  foreach {w iStart iEnd} [fts5_tokenize_split $text] {
    sqlite3_fts5_token $w $iStart $iEnd
    if {$tflags == $mode && [info exists ::tclnum_syn($w)]} {
      foreach s $::tclnum_syn($w)  { sqlite3_fts5_token -colo $s $iStart $iEnd }
    }
  }
}

proc tclnum_create {args} {
  set mode query
  if {[llength $args]} {
    set mode [lindex $args 0]
  }
  if {$mode != "query" && $mode != "document"} { error "bad mode: $mode" }
  return [list tclnum_tokenize $mode]
}

proc fts5_tclnum_register {db} {
  foreach SYNDICT {
    {zero  0}
    {one   1 i}
    {two   2 ii}
    {three 3 iii}
    {four  4 iv}
    {five  5 v}
    {six   6 vi}
    {seven 7 vii}
    {eight 8 viii}
    {nine  9 ix}

    {a1 a2 a3 a4 a5 a6 a7 a8 a9}
    {b1 b2 b3 b4 b5 b6 b7 b8 b9}
    {c1 c2 c3 c4 c5 c6 c7 c8 c9}
  } {
    foreach s $SYNDICT {
      set o [list]
      foreach x $SYNDICT {if {$x!=$s} {lappend o $x}}
      set ::tclnum_syn($s) $o
    }
  }
  sqlite3_fts5_create_tokenizer db tclnum tclnum_create
}
#
# End of tokenizer code.
#-------------------------------------------------------------------------

# 2016 Jan 19
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#*************************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this script is testing the FTS5 module.
#

source [file join [file dirname [info script]] fts5_common.tcl]
set testprefix fts5bigtok

proc rndterm {} {
  set L [list a b c d e f g h i j k l m n o p q r s t u v w x y z]
  set l [lindex $L [expr int(rand() * [llength $L])]]
  string repeat $l [expr int(rand() * 5) + 60]
}

proc rnddoc {n} {
  set res [list]
  for {set i 0} {$i < $n} {incr i} {
    lappend res [rndterm]
  }
  set res
}

foreach_detail_mode $::testprefix {
  db func rnddoc rnddoc
  do_execsql_test 1.0 {
    CREATE VIRTUAL TABLE t1 USING fts5(x, detail=%DETAIL%);
    INSERT INTO t1(t1, rank) VALUES('pgsz', 32);
    CREATE VIRTUAL TABLE t1vocab USING fts5vocab(t1, row);

    WITH s(i) AS ( SELECT 1 UNION ALL SELECT i+1 FROM s WHERE i<10 )
    INSERT INTO t1 SELECT rnddoc(3) FROM s;

    WITH s(i) AS ( SELECT 1 UNION ALL SELECT i+1 FROM s WHERE i<10 )
    INSERT INTO t1 SELECT rnddoc(3) FROM s;
  }

  foreach v [db eval {SELECT term FROM t1vocab}] {
    set res [db eval {SELECT rowid FROM t1($v)}]
    do_execsql_test 1.[string range $v 0 0] {
      SELECT rowid FROM t1($v) ORDER BY rowid DESC
    } [lsort -integer -decr $res]
  }

  do_execsql_test 2.0 {
    INSERT INTO t1(t1) VALUES('optimize');
  }

  foreach v [db eval {SELECT term FROM t1vocab}] {
    set res [db eval {SELECT rowid FROM t1($v)}]
    do_execsql_test 2.[string range $v 0 0] {
      SELECT rowid FROM t1($v) ORDER BY rowid DESC
    } [lsort -integer -decr $res]
  }
}

finish_test

#
foreach {tn opt} {
  1 {prefix=x}  
  2 {prefix='x'}
  3 {prefix='$'}
  4 {prefix='1,2,'}
  5 {prefix=',1'}


} {
  set res [list 1 {malformed prefix=... directive}]
  do_catchsql_test 2.$tn "CREATE VIRTUAL TABLE f1 USING fts5(x, $opt)" $res
}

#-------------------------------------------------------------------------
# Syntax errors in the 'rank' option.
................................................................................

#-------------------------------------------------------------------------
# Errors in:
#
#   9.1.* 'pgsz' options.
#   9.2.* 'automerge' options.
#   9.3.* 'crisismerge' options.


#
do_execsql_test 9.0 {
  CREATE VIRTUAL TABLE abc USING fts5(a, b);
} {}
do_catchsql_test 9.1.1 {
  INSERT INTO abc(abc, rank) VALUES('pgsz', -5);
} {1 {SQL logic error or missing database}}
................................................................................
do_execsql_test 9.3.4 {
  INSERT INTO abc(abc, rank) VALUES('crisismerge', 50000000);
} {}

do_catchsql_test 9.4.1 {
  INSERT INTO abc(abc, rank) VALUES('nosuchoption', 1);
} {1 {SQL logic error or missing database}}











#-------------------------------------------------------------------------
# Too many prefix indexes. Maximum allowed is 31.
#
foreach {tn spec} {
  1 {prefix="1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32"}
  2 {prefix="1 2 3 4", prefix="5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32"}
} {
  set sql "CREATE VIRTUAL TABLE xyz USING fts5(x, $spec)"
  do_catchsql_test 10.$tn $sql {1 {too many prefix indexes (max 31)}}
}
















finish_test

#
foreach {tn opt} {
  1 {prefix=x}  
  2 {prefix='x'}
  3 {prefix='$'}
  4 {prefix='1,2,'}
  5 {prefix=',1'}
  6 {prefix='1,2,3...'}
  7 {prefix='1,2,3xyz'}
} {
  set res [list 1 {malformed prefix=... directive}]
  do_catchsql_test 2.$tn "CREATE VIRTUAL TABLE f1 USING fts5(x, $opt)" $res
}

#-------------------------------------------------------------------------
# Syntax errors in the 'rank' option.
................................................................................

#-------------------------------------------------------------------------
# Errors in:
#
#   9.1.* 'pgsz' options.
#   9.2.* 'automerge' options.
#   9.3.* 'crisismerge' options.
#   9.4.* a non-existant option.
#   9.5.* 'hashsize' options.
#
do_execsql_test 9.0 {
  CREATE VIRTUAL TABLE abc USING fts5(a, b);
} {}
do_catchsql_test 9.1.1 {
  INSERT INTO abc(abc, rank) VALUES('pgsz', -5);
} {1 {SQL logic error or missing database}}
................................................................................
do_execsql_test 9.3.4 {
  INSERT INTO abc(abc, rank) VALUES('crisismerge', 50000000);
} {}

do_catchsql_test 9.4.1 {
  INSERT INTO abc(abc, rank) VALUES('nosuchoption', 1);
} {1 {SQL logic error or missing database}}

do_catchsql_test 9.5.1 {
  INSERT INTO abc(abc, rank) VALUES('hashsize', 'not an integer');
} {1 {SQL logic error or missing database}}
do_catchsql_test 9.5.2 {
  INSERT INTO abc(abc, rank) VALUES('hashsize', -500000);
} {1 {SQL logic error or missing database}}
do_catchsql_test 9.5.3 {
  INSERT INTO abc(abc, rank) VALUES('hashsize', 500000);
} {0 {}}

#-------------------------------------------------------------------------
# Too many prefix indexes. Maximum allowed is 31.
#
foreach {tn spec} {
  1 {prefix="1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32"}
  2 {prefix="1 2 3 4", prefix="5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32"}
} {
  set sql "CREATE VIRTUAL TABLE xyz USING fts5(x, $spec)"
  do_catchsql_test 10.$tn $sql {1 {too many prefix indexes (max 31)}}
}

#-------------------------------------------------------------------------
# errors in the detail= option.
#
foreach {tn opt} {
  1 {detail=x}  
  2 {detail='x'}
  3 {detail='$'}
  4 {detail='1,2,'}
  5 {detail=',1'}
  6 {detail=''}
} {
  set res [list 1 {malformed detail=... directive}]
  do_catchsql_test 11.$tn "CREATE VIRTUAL TABLE f1 USING fts5(x, $opt)" $res
}

finish_test

  execsql { SELECT * FROM xx }
} -body {
  execsql { DROP TABLE xx }
} -test {
  faultsim_test_result [list 0 {}]
}

#-------------------------------------------------------------------------
# An OOM within an "ORDER BY rank" query.
#
db func rnddoc fts5_rnddoc 
do_execsql_test 2.0 {
  CREATE VIRTUAL TABLE xx USING fts5(x);
  INSERT INTO xx VALUES ('abc ' || rnddoc(10));
  INSERT INTO xx VALUES ('abc abc' || rnddoc(9));
  INSERT INTO xx VALUES ('abc abc abc' || rnddoc(8));
} {}
faultsim_save_and_close

do_faultsim_test 2 -faults oom-* -prep {
  faultsim_restore_and_reopen
  execsql { SELECT * FROM xx }
} -body {
  execsql { SELECT rowid FROM xx WHERE xx MATCH 'abc' ORDER BY rank }
} -test {
  faultsim_test_result [list 0 {3 2 1}]
}

#-------------------------------------------------------------------------
# An OOM while "reseeking" an FTS cursor.
#
do_execsql_test 3.0 {
  CREATE VIRTUAL TABLE jj USING fts5(j);
  INSERT INTO jj(rowid, j) VALUES(101, 'm t w t f s s');
  INSERT INTO jj(rowid, j) VALUES(202, 't w t f s');

  execsql { SELECT * FROM xx }
} -body {
  execsql { DROP TABLE xx }
} -test {
  faultsim_test_result [list 0 {}]
}






















#-------------------------------------------------------------------------
# An OOM while "reseeking" an FTS cursor.
#
do_execsql_test 3.0 {
  CREATE VIRTUAL TABLE jj USING fts5(j);
  INSERT INTO jj(rowid, j) VALUES(101, 'm t w t f s s');
  INSERT INTO jj(rowid, j) VALUES(202, 't w t f s');

do_faultsim_test 2.2 -faults oom-t* -body {
  db eval { INSERT INTO tt(tt) VALUES('integrity-check') }
} -test {
  faultsim_test_result {0 {}}
}

#-------------------------------------------------------------------------
# OOM while scanning an fts5vocab table.
#
reset_db
do_test 3.0 {
  execsql {
    CREATE VIRTUAL TABLE tt USING fts5(x);
    CREATE VIRTUAL TABLE tv USING fts5vocab(tt, 'row');




    INSERT INTO tt(tt, rank) VALUES('pgsz', 32);

    BEGIN;
  }

  for {set i 0} {$i < 20} {incr i} {
    set str [string repeat "$i " 50]
    execsql { INSERT INTO tt VALUES($str) }

  }
  execsql COMMIT
} {}

do_faultsim_test 3.1 -faults oom-t* -body {
  db eval {
    SELECT term FROM tv;
................................................................................
do_faultsim_test 3.2 -faults oom-t* -body {
  db eval {
    SELECT term FROM tv WHERE term BETWEEN '1' AND '2';
  }
} -test {
  faultsim_test_result {0 {1 10 11 12 13 14 15 16 17 18 19 2}}
}

























finish_test

do_faultsim_test 2.2 -faults oom-t* -body {
  db eval { INSERT INTO tt(tt) VALUES('integrity-check') }
} -test {
  faultsim_test_result {0 {}}
}

#-------------------------------------------------------------------------
# OOM while scanning fts5vocab tables.
#
reset_db
do_test 3.0 {
  execsql {
    CREATE VIRTUAL TABLE tt USING fts5(x);
    CREATE VIRTUAL TABLE tv USING fts5vocab(tt, 'row');

    CREATE VIRTUAL TABLE tt2 USING fts5(x, detail=col);
    CREATE VIRTUAL TABLE tv2 USING fts5vocab(tt2, 'col');

    INSERT INTO tt(tt, rank) VALUES('pgsz', 32);
    INSERT INTO tt2(tt2, rank) VALUES('pgsz', 32);
    BEGIN;
  }

  for {set i 0} {$i < 20} {incr i} {
    set str [string repeat "$i " 50]
    execsql { INSERT INTO tt VALUES($str) }
    execsql { INSERT INTO tt2 VALUES($str) }
  }
  execsql COMMIT
} {}

do_faultsim_test 3.1 -faults oom-t* -body {
  db eval {
    SELECT term FROM tv;
................................................................................
do_faultsim_test 3.2 -faults oom-t* -body {
  db eval {
    SELECT term FROM tv WHERE term BETWEEN '1' AND '2';
  }
} -test {
  faultsim_test_result {0 {1 10 11 12 13 14 15 16 17 18 19 2}}
}

breakpoint
do_execsql_test 3.3.0 {
  SELECT * FROM tv2;
} {
  0 x 1 {} 1 x 1 {} 10 x 1 {} 11 x 1 {} 12 x 1 {} 13 x 1 {}        
  14 x 1 {} 15 x 1 {} 16 x 1 {} 17 x 1 {} 18 x 1 {} 19  x 1 {}     
  2 x 1 {} 3 x 1 {} 4 x 1 {} 5 x 1 {} 6 x 1 {} 7 x 1 {} 8 x 1 {}   
  9 x 1 {}
}
do_faultsim_test 3.3 -faults oom-t* -body {
  db eval {
    SELECT * FROM tv2;
  }
} -test {
  faultsim_test_result [list 0 [list                                   \
      0 x 1 {} 1 x 1 {} 10 x 1 {} 11 x 1 {} 12 x 1 {} 13 x 1 {}        \
      14 x 1 {} 15 x 1 {} 16 x 1 {} 17 x 1 {} 18 x 1 {} 19  x 1 {}     \
      2 x 1 {} 3 x 1 {} 4 x 1 {} 5 x 1 {} 6 x 1 {} 7 x 1 {} 8 x 1 {}   \
      9 x 1 {}
  ]]
}



finish_test

ifcapable !fts5 {
  finish_test
  return
}

foreach_detail_mode $testprefix {

if {[detail_is_none]==0} continue

fts5_aux_test_functions db
do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(a, b, detail=%DETAIL%);
  INSERT INTO t1 VALUES('a b c d', '1 2 3 4');
  INSERT INTO t1 VALUES('a b a b', NULL);
  INSERT INTO t1 VALUES(NULL, '1 2 1 2');
}

do_faultsim_test 1 -faults oom-t* -body {
  execsql { 
    SELECT rowid, fts5_test_poslist(t1) FROM t1 WHERE t1 MATCH 'b OR 2' 
  }
} -test {
  faultsim_test_result {0 {1 {0.0.1 1.1.1} 2 {0.0.1 0.0.3} 3 {1.1.1 1.1.3}}} \
                       {1 SQLITE_NOMEM}
}









}

finish_test

ifcapable !fts5 {
  finish_test
  return
}

foreach_detail_mode $testprefix {



fts5_aux_test_functions db
do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(a, b, detail=%DETAIL%);
  INSERT INTO t1 VALUES('a b c d', '1 2 3 4');
  INSERT INTO t1 VALUES('a b a b', NULL);
  INSERT INTO t1 VALUES(NULL, '1 2 1 2');
}

do_faultsim_test 1 -faults oom-* -body {
  execsql { 
    SELECT rowid, fts5_test_poslist(t1) FROM t1 WHERE t1 MATCH 'b OR 2' 
  }
} -test {
  faultsim_test_result {0 {1 {0.0.1 1.1.1} 2 {0.0.1 0.0.3} 3 {1.1.1 1.1.3}}} \
                       {1 SQLITE_NOMEM}
}

do_faultsim_test 2 -faults oom-* -body {
  execsql { 
    INSERT INTO t1(t1) VALUES('integrity-check');
  }
} -test {
  faultsim_test_result {0 {}} {1 SQLITE_NOMEM}
}

}

finish_test

# 2015 September 3
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#*************************************************************************
#
# This file is focused on OOM errors.
#

source [file join [file dirname [info script]] fts5_common.tcl]
source $testdir/malloc_common.tcl
set testprefix fts5fault9

# If SQLITE_ENABLE_FTS3 is defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}

foreach_detail_mode $testprefix {

fts5_aux_test_functions db

do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(a, b, detail=%DETAIL%);
  INSERT INTO t1(t1, rank) VALUES('pgsz', 32);
  WITH seq(s) AS ( SELECT 1 UNION ALL SELECT s+1 FROM seq WHERE s<50)
  INSERT INTO t1 SELECT 'x x x y y y', 'a b c d e f' FROM seq;
}

do_faultsim_test 1 -faults oom-* -body {
  execsql { SELECT count(*) FROM t1('x AND y') }
} -test {
  faultsim_test_result {0 50}
}

do_execsql_test 2.0 {
  CREATE VIRTUAL TABLE t2 USING fts5(a, b, detail=%DETAIL%);
  INSERT INTO t2(t2, rank) VALUES('pgsz', 32);
  INSERT INTO t2 VALUES('abc cba', 'cba abc');
  INSERT INTO t2 VALUES('abc cba', 'cba abc');
  INSERT INTO t2 VALUES('abc cba', 'cba abc');

  INSERT INTO t2 VALUES('axy cyx', 'cyx axy');
  INSERT INTO t2 VALUES('axy cyx', 'cyx axy');
  INSERT INTO t2 VALUES('axy cyx', 'cyx axy');
}

do_faultsim_test 2 -faults oom-* -body {
  execsql { SELECT count(*) FROM t2('a* AND c*') }
} -test {
  faultsim_test_result {0 6}
}


do_execsql_test 3.0 {
  CREATE VIRTUAL TABLE t3 USING fts5(a, detail=%DETAIL%);
  INSERT INTO t3 VALUES('a x x a x a a a');
  INSERT INTO t3 VALUES('x a a x a x x x');
}

do_faultsim_test 3.1 -faults oom-* -body {
  execsql { SELECT highlight(t3, 0, '[', ']') FROM t3('a') }
} -test {
  faultsim_test_result {0 {{[a] x x [a] x [a] [a] [a]} {x [a] [a] x [a] x x x}}}
}

do_faultsim_test 3.2 -faults oom-t* -body {
  execsql { SELECT fts5_test_poslist2(t3) FROM t3('x') }
} -test {
  faultsim_test_result \
      {0 {{0.0.1 0.0.2 0.0.4} {0.0.0 0.0.3 0.0.5 0.0.6 0.0.7}}} \
      {1 SQLITE_NOMEM}
}

#-------------------------------------------------------------------------
# Test OOM injection with the xPhraseFirstColumn() API and a tokenizer
# uses query synonyms.
#
fts5_tclnum_register db
do_execsql_test 4.0 {
  CREATE VIRTUAL TABLE t4 USING fts5(x, y, z, detail=%DETAIL%, tokenize=tclnum);
  INSERT INTO t4 VALUES('one two three', '1 2 3', 'i ii iii');
  INSERT INTO t4 VALUES('1 2 3', 'i ii iii', 'one two three');
  INSERT INTO t4 VALUES('i ii iii', 'one two three', 'i ii iii');

  INSERT INTO t4 VALUES('a1 a2 a3', 'a4 a5 a6', 'a7 a8 a9');
  INSERT INTO t4 VALUES('b1 b2 b3', 'b4 b5 b6', 'b7 b8 b9');
  INSERT INTO t4 VALUES('c1 c2 c3', 'c4 c5 c6', 'c7 c8 c9');
}

do_faultsim_test 4.1 -faults oom-t* -body {
  execsql { SELECT rowid, fts5_test_collist(t4) FROM t4('2') }
} -test {
  faultsim_test_result \
      {0 {1 {0.0 0.1 0.2} 2 {0.0 0.1 0.2} 3 {0.0 0.1 0.2}}} {1 SQLITE_NOMEM}
}

do_faultsim_test 4.2 -faults oom-t* -body {
  execsql { SELECT rowid, fts5_test_collist(t4) FROM t4('a5 OR b5 OR c5') }
} -test {
  faultsim_test_result \
      {0 {4 {0.0 0.1 0.2} 5 {1.0 1.1 1.2} 6 {2.0 2.1 2.2}}} {1 SQLITE_NOMEM}
}


#-------------------------------------------------------------------------
# An OOM within an "ORDER BY rank" query.
#
db func rnddoc fts5_rnddoc 
do_execsql_test 5.0 {
  CREATE VIRTUAL TABLE xx USING fts5(x, y, detail=%DETAIL%);
  INSERT INTO xx VALUES ('def', 'abc ' || rnddoc(10));
  INSERT INTO xx VALUES ('def', 'abc abc' || rnddoc(9));
  INSERT INTO xx VALUES ('def', 'abc abc abc' || rnddoc(8));
} {}
faultsim_save_and_close

do_faultsim_test 5 -faults oom-* -prep {
  faultsim_restore_and_reopen
  execsql { SELECT * FROM xx }
} -body {
  execsql { SELECT rowid FROM xx('abc AND def') ORDER BY rank }
} -test {
  faultsim_test_result [list 0 {3 2 1}]
}

set doc [string repeat "xyz " 500]
do_execsql_test 6.0 {
  CREATE VIRTUAL TABLE yy USING fts5(y, detail=%DETAIL%);
  INSERT INTO yy(yy, rank) VALUES('pgsz', 64);
  INSERT INTO yy VALUES ($doc);
  INSERT INTO yy VALUES ('1 2 3');
  INSERT INTO yy VALUES ('xyz');
  UPDATE yy SET y = y WHERE rowid = 1;
  UPDATE yy SET y = y WHERE rowid = 1;
  UPDATE yy SET y = y WHERE rowid = 1;
  UPDATE yy SET y = y WHERE rowid = 1;
} {}

do_faultsim_test 6 -faults oom-* -body {
  execsql { SELECT rowid FROM yy('xyz') }
} -test {
  faultsim_test_result [list 0 {1 3}]
}


} ;# foreach_detail_mode...

finish_test

  for {set i 0} {$i<$nWord} {incr i} {
    set j [expr {int(rand() * $nVocab)}]
    lappend doc [lindex $vocab $j]
  }
  return $doc
}



set vocab [build_vocab1]
db func r random_doc 

do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE eee USING fts5(e, ee);
  BEGIN;
    WITH ii(i) AS (SELECT 1 UNION ALL SELECT i+1 FROM ii WHERE i<100)
    INSERT INTO eee SELECT r($vocab, 5), r($vocab, 7) FROM ii;
    INSERT INTO eee(eee) VALUES('integrity-check');
  COMMIT;
  INSERT INTO eee(eee) VALUES('integrity-check');
}
................................................................................
}
do_test 1.2 {
  for {set i 1} {$i <= 100} {incr i} {
    execsql { INSERT INTO eee VALUES( r($vocab, 5), r($vocab, 7) ) }
  }
} {}
  
do_test 1.2 {
  db eval { SELECT term, doc FROM vocab } {
    set nRow [db one {SELECT count(*) FROM eee WHERE eee MATCH $term}]
    if {$nRow != $doc} {
      error "term=$term fts5vocab=$doc cnt=$nRow"
    }
  }
  set {} {}
} {}

do_execsql_test 1.3 {
  COMMIT;
  INSERT INTO eee(eee) VALUES('integrity-check');
}



finish_test

  for {set i 0} {$i<$nWord} {incr i} {
    set j [expr {int(rand() * $nVocab)}]
    lappend doc [lindex $vocab $j]
  }
  return $doc
}

foreach_detail_mode $testprefix {

set vocab [build_vocab1]
db func r random_doc 

do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE eee USING fts5(e, ee, detail=%DETAIL%);
  BEGIN;
    WITH ii(i) AS (SELECT 1 UNION ALL SELECT i+1 FROM ii WHERE i<100)
    INSERT INTO eee SELECT r($vocab, 5), r($vocab, 7) FROM ii;
    INSERT INTO eee(eee) VALUES('integrity-check');
  COMMIT;
  INSERT INTO eee(eee) VALUES('integrity-check');
}
................................................................................
}
do_test 1.2 {
  for {set i 1} {$i <= 100} {incr i} {
    execsql { INSERT INTO eee VALUES( r($vocab, 5), r($vocab, 7) ) }
  }
} {}
  
do_test 1.3 {
  db eval { SELECT term, doc FROM vocab } {
    set nRow [db one {SELECT count(*) FROM eee WHERE eee MATCH $term}]
    if {$nRow != $doc} {
      error "term=$term fts5vocab=$doc cnt=$nRow"
    }
  }
  set {} {}
} {}

do_execsql_test 1.4 {
  COMMIT;
  INSERT INTO eee(eee) VALUES('integrity-check');
}

} ;# foreach_detail_mode

finish_test

  INSERT INTO gg(gg) VALUES('integrity-check');
}

do_execsql_test 5.2 {
  INSERT INTO gg(gg) VALUES('optimize');
}

breakpoint
do_execsql_test 5.3 {
  INSERT INTO gg(gg) VALUES('integrity-check');
}





























































finish_test

  INSERT INTO gg(gg) VALUES('integrity-check');
}

do_execsql_test 5.2 {
  INSERT INTO gg(gg) VALUES('optimize');
}


do_execsql_test 5.3 {
  INSERT INTO gg(gg) VALUES('integrity-check');
}

do_test 5.4.1 {
  set ok 0
  for {set i 0} {$i < 10000} {incr i} {
    set T [format %.5d $i]
    set res  [db eval { SELECT rowid FROM gg($T) ORDER BY rowid ASC  }]
    set res2 [db eval { SELECT rowid FROM gg($T) ORDER BY rowid DESC }]
    if {$res == [lsort -integer $res2]} { incr ok }
  }
  set ok
} {10000}

do_test 5.4.2 {
  set ok 0
  for {set i 0} {$i < 100} {incr i} {
    set T "[format %.3d $i]*"
    set res  [db eval { SELECT rowid FROM gg($T) ORDER BY rowid ASC  }]
    set res2 [db eval { SELECT rowid FROM gg($T) ORDER BY rowid DESC }]
    if {$res == [lsort -integer $res2]} { incr ok }
  }
  set ok
} {100}

#-------------------------------------------------------------------------
# Similar to 5.*.
#
foreach {tn pgsz} {
  1  32
  2  36
  3  40
  4  44
  5  48
} {
  do_execsql_test 6.$tn.1 {
    DROP TABLE IF EXISTS hh;
    CREATE VIRTUAL TABLE hh USING fts5(y);
    INSERT INTO hh(hh, rank) VALUES('pgsz', $pgsz);

    WITH s(i) AS (SELECT 0 UNION ALL SELECT i+1 FROM s WHERE i<999)
     INSERT INTO hh SELECT printf("%.3d%.3d%.3d %.3d%.3d%.3d",i,i,i,i+1,i+1,i+1)
     FROM s;

    WITH s(i) AS (SELECT 0 UNION ALL SELECT i+1 FROM s WHERE i<999)
     INSERT INTO hh SELECT printf("%.3d%.3d%.3d %.3d%.3d%.3d",i,i,i,i+1,i+1,i+1)
     FROM s;

    INSERT INTO hh(hh) VALUES('optimize');
  }

  do_test 6.$tn.2 {
    set ok 0
    for {set i 0} {$i < 1000} {incr i} {
      set T [format %.3d%.3d%.3d $i $i $i]
      set res  [db eval { SELECT rowid FROM hh($T) ORDER BY rowid ASC  }]
      set res2 [db eval { SELECT rowid FROM hh($T) ORDER BY rowid DESC }]
      if {$res == [lsort -integer $res2]} { incr ok }
    }
    set ok
  } {1000}
}

finish_test

# 2014 Dec 20
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
#
# Test that focus on incremental merges of segments.
#

source [file join [file dirname [info script]] fts5_common.tcl]
set testprefix fts5merge

proc dump_structure {} {
  db eval {SELECT fts5_decode(id, block) AS t FROM t1_data WHERE id=10} {
    foreach lvl [lrange $t 1 end] {
      set seg [string repeat . [expr [llength $lvl]-2]]
      puts "[lrange $lvl 0 1] $seg"
    }
  }
}

foreach_detail_mode $testprefix {

if {[detail_is_none]==0} continue

do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(x, detail=%DETAIL%);
  INSERT INTO t1(t1, rank) VALUES('pgsz', 32);
  INSERT INTO t1(t1, rank) VALUES('crisismerge', 2);
  INSERT INTO t1 VALUES('1 2 3 4');
}

expr srand(0)
db func rnddoc fts5_rnddoc
do_test 1.1 {
  for {set i 0} {$i < 100} {incr i} {
    execsql {
      BEGIN;
        DELETE FROM t1 WHERE rowid = 1;
        INSERT INTO t1(rowid, x) VALUES(1, '1 2 3 4');
        INSERT INTO t1 VALUES(rnddoc(10));
      COMMIT;
    }
  }
} {}

do_execsql_test 1.2 {
  INSERT INTO t1(t1) VALUES('integrity-check');
}

}

finish_test

do_execsql_test 2.2 {
  WITH r(a, b) AS (
    SELECT rnddoc(6), rnddoc(6) UNION ALL
    SELECT rnddoc(6), rnddoc(6) FROM r
  )
  INSERT INTO x1 SELECT * FROM r LIMIT 10000;

}

set res [db one {SELECT count(*) FROM x1_data}]
do_execsql_test 2.3 {
  SELECT count(fts5_decode(rowid, block)) FROM x1_data;
} $res
do_execsql_test 2.4 {
  UPDATE x1_data SET block = X'';
  -- SELECT count(fts5_decode(rowid, block)) FROM x1_data;
  SELECT count(*) FROM x1_data;
} $res

do_execsql_test 2.5 {
  INSERT INTO x1(x1, rank) VALUES('pgsz', 1024);
  INSERT INTO x1(x1) VALUES('rebuild');
}

................................................................................
  SELECT rowid FROM x4 WHERE x4 MATCH 'a'
} {1 2 3 4}

set res [db one {SELECT count(*) FROM x4_data}]
do_execsql_test 5.2 {
  SELECT count(fts5_decode(rowid, block)) FROM x4_data;
} $res
































finish_test

do_execsql_test 2.2 {
  WITH r(a, b) AS (
    SELECT rnddoc(6), rnddoc(6) UNION ALL
    SELECT rnddoc(6), rnddoc(6) FROM r
  )
  INSERT INTO x1 SELECT * FROM r LIMIT 10000;
  DELETE FROM x1 WHERE (rowid%2);
}

set res [db one {SELECT count(*) FROM x1_data}]
do_execsql_test 2.3 {
  SELECT count(fts5_decode(rowid, block)) FROM x1_data;
} $res
do_execsql_test 2.4 {
  UPDATE x1_data SET block = X'';
  SELECT count(fts5_decode(rowid, block)) FROM x1_data;

} $res

do_execsql_test 2.5 {
  INSERT INTO x1(x1, rank) VALUES('pgsz', 1024);
  INSERT INTO x1(x1) VALUES('rebuild');
}

................................................................................
  SELECT rowid FROM x4 WHERE x4 MATCH 'a'
} {1 2 3 4}

set res [db one {SELECT count(*) FROM x4_data}]
do_execsql_test 5.2 {
  SELECT count(fts5_decode(rowid, block)) FROM x4_data;
} $res

#-------------------------------------------------------------------------
#

do_execsql_test 6.0 {
  CREATE VIRTUAL TABLE x5 USING fts5(x, detail=none);
  INSERT INTO x5(x5, rank) VALUES('pgsz', 32);
  INSERT INTO x5 VALUES('a b c d e f');
  INSERT INTO x5 VALUES('a b c d e f');
  INSERT INTO x5 VALUES('a b c d e f');
  BEGIN;
    WITH s(i) AS (
      SELECT 1 UNION ALL SELECT i+1 FROM s WHERE i<100
    ) INSERT INTO x5 SELECT 'a b c d e f' FROM s;
  COMMIT;
  SELECT count(fts5_decode_none(rowid, block)) FROM x5_data;
} {32}

do_execsql_test 6.1 {
  DELETE FROM x5 WHERE rowid <= 2;
  SELECT count(fts5_decode_none(rowid, block)) FROM x5_data;
} {34}

do_execsql_test 6.2 {
  UPDATE x5 SET x='a b c d e f' WHERE rowid=3;
  SELECT count(fts5_decode_none(rowid, block)) FROM x5_data;
} {36}

#db eval {SELECT rowid, fts5_decode_none(rowid, block) aS r FROM x5_data} {puts $r}



finish_test

# If SQLITE_ENABLE_FTS5 is defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}

if 1 {

do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(a, detail=none);
  INSERT INTO t1 VALUES('a b c');
}
do_execsql_test 1.1 {
  SELECT rowid FROM t1('c a b')
} {1}
................................................................................
  INSERT INTO t1 VALUES('a b c d');
} {}

do_execsql_test 14.1 {
  SELECT fts5_test_poslist(t1) FROM t1('b') ORDER BY rank;
} {0.0.1}

}

#-------------------------------------------------------------------------
#
reset_db
do_execsql_test 15.1 {
  CREATE VIRTUAL TABLE t1 USING fts5(x, detail=none);
  BEGIN;
    INSERT INTO t1(rowid, x) VALUES(1, 'sqlite');
................................................................................
do_execsql_test 15.3.2 {
  SELECT rowid FROM t1('sqlite') ORDER BY rowid DESC;
} {}

do_test 15.4 {
  execsql { INSERT INTO t1(t1) VALUES('integrity-check') }
} {}
  






































finish_test

# If SQLITE_ENABLE_FTS5 is defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}



do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(a, detail=none);
  INSERT INTO t1 VALUES('a b c');
}
do_execsql_test 1.1 {
  SELECT rowid FROM t1('c a b')
} {1}
................................................................................
  INSERT INTO t1 VALUES('a b c d');
} {}

do_execsql_test 14.1 {
  SELECT fts5_test_poslist(t1) FROM t1('b') ORDER BY rank;
} {0.0.1}



#-------------------------------------------------------------------------
#
reset_db
do_execsql_test 15.1 {
  CREATE VIRTUAL TABLE t1 USING fts5(x, detail=none);
  BEGIN;
    INSERT INTO t1(rowid, x) VALUES(1, 'sqlite');
................................................................................
do_execsql_test 15.3.2 {
  SELECT rowid FROM t1('sqlite') ORDER BY rowid DESC;
} {}

do_test 15.4 {
  execsql { INSERT INTO t1(t1) VALUES('integrity-check') }
} {}

#-------------------------------------------------------------------------
#
reset_db
do_execsql_test 16.0 {
  CREATE VIRTUAL TABLE t2 USING fts5(x, detail=none);
  BEGIN;
    INSERT INTO t2(rowid, x) VALUES(1, 'a b c');
    INSERT INTO t2(rowid, x) VALUES(456, 'a b c');
    INSERT INTO t2(rowid, x) VALUES(1000, 'a b c');
  COMMIT;
  UPDATE t2 SET x=x;
}

do_execsql_test 16.1 {
  INSERT INTO t2(t2) VALUES('integrity-check');
} {}

do_execsql_test 16.2 {
  SELECT rowid FROM t2('b') ORDER BY rowid DESC
} {1000 456 1}


#-------------------------------------------------------------------------
#
reset_db
do_execsql_test 16.0 {
  CREATE VIRTUAL TABLE t2 USING fts5(x, detail=none);
  BEGIN;
    INSERT INTO t2(rowid, x) VALUES(1, 'a b c');
    INSERT INTO t2(rowid, x) VALUES(456, 'a b c');
    INSERT INTO t2(rowid, x) VALUES(1000, 'a b c');
  COMMIT;
  UPDATE t2 SET x=x;
  DELETE FROM t2;
}

#db eval {SELECT rowid, fts5_decode_none(rowid, block) aS r FROM t2_data} {puts $r}
  
finish_test

# If SQLITE_ENABLE_FTS5 is defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}

foreach S {
  {zero 0}
  {one 1 i}
  {two 2 ii}
  {three 3 iii}
  {four 4 iv}
  {five 5 v}
  {six 6 vi}
  {seven 7 vii}
  {eight 8 viii}
  {nine 9 ix}
} {
  foreach s $S {
    set o [list]
    foreach x $S {if {$x!=$s} {lappend o $x}}
    set ::syn($s) $o
  }
}

proc tcl_tokenize {tflags text} {
  foreach {w iStart iEnd} [fts5_tokenize_split $text] {
    sqlite3_fts5_token $w $iStart $iEnd
  }
}

proc tcl_create {args} {
  return "tcl_tokenize"
}

sqlite3_fts5_create_tokenizer db tcl tcl_create


#-------------------------------------------------------------------------
# Warm body test for the code in fts5_tcl.c.
#

do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE ft USING fts5(x, tokenize = tcl);
  INSERT INTO ft VALUES('abc def ghi');
  INSERT INTO ft VALUES('jkl mno pqr');
  SELECT rowid, x FROM ft WHERE ft MATCH 'def';
  SELECT x, rowid FROM ft WHERE ft MATCH 'pqr';
} {1 {abc def ghi} {jkl mno pqr} 2}

#-------------------------------------------------------------------------
# Test a tokenizer that supports synonyms by adding extra entries to the
# FTS index.
#

proc tcl_tokenize {tflags text} {
  foreach {w iStart iEnd} [fts5_tokenize_split $text] {
    sqlite3_fts5_token $w $iStart $iEnd
    if {$tflags=="document" && [info exists ::syn($w)]} {
      foreach s $::syn($w) {
        sqlite3_fts5_token -colo $s $iStart $iEnd
      }
    }
  }
}
reset_db
sqlite3_fts5_create_tokenizer db tcl tcl_create


do_execsql_test 2.0 {
  CREATE VIRTUAL TABLE ft USING fts5(x, tokenize = tcl);


  INSERT INTO ft VALUES('one two three');
  INSERT INTO ft VALUES('four five six');
  INSERT INTO ft VALUES('eight nine ten');
} {}

foreach {tn expr res} {
  1 "3" 1
  2 "eight OR 8 OR 5" {2 3}
  3 "10" {}
  4 "1*" {1}
  5 "1 + 2" {1}
} {

  do_execsql_test 2.1.$tn {
    SELECT rowid FROM ft WHERE ft MATCH $expr
  } $res
}

#-------------------------------------------------------------------------
# Test some broken tokenizers:
................................................................................
  SELECT rowid FROM ft WHERE ft MATCH 'one + two + two + three';
} {}

#-------------------------------------------------------------------------
# Check that expressions with synonyms can be parsed and executed.
#
reset_db
sqlite3_fts5_create_tokenizer db tcl tcl_create
proc tcl_tokenize {tflags text} {
  foreach {w iStart iEnd} [fts5_tokenize_split $text] {
    sqlite3_fts5_token $w $iStart $iEnd
    if {$tflags=="query" && [info exists ::syn($w)]} {
      foreach s $::syn($w) {
        sqlite3_fts5_token -colo $s $iStart $iEnd
      }
    }
  }
}

foreach {tn expr res} {
  1  {abc}                           {"abc"}
  2  {one}                           {"one"|"i"|"1"}
  3  {3}                             {"3"|"iii"|"three"}
  4  {3*}                            {"3"|"iii"|"three" *}
} {

  do_execsql_test 4.1.$tn {SELECT fts5_expr($expr, 'tokenize=tcl')} [list $res]

}

do_execsql_test 4.2.1 {
  CREATE VIRTUAL TABLE xx USING fts5(x, tokenize=tcl);
  INSERT INTO xx VALUES('one two');
  INSERT INTO xx VALUES('three four');
}

do_execsql_test 4.2.2 {
  SELECT rowid FROM xx WHERE xx MATCH '2'
} {1}
................................................................................

do_execsql_test 4.2.3 {
  SELECT rowid FROM xx WHERE xx MATCH '3'
} {2}

do_test 5.0 {
  execsql { 
    CREATE VIRTUAL TABLE t1 USING fts5(a, b, tokenize=tcl)
  }
  foreach {rowid a b} {
    1 {four v 4 i three} {1 3 five five 4 one}
    2 {5 1 3 4 i} {2 2 v two 4}
    3 {5 i 5 2 four 4 1} {iii ii five two 1}
    4 {ii four 4 one 5 three five} {one 5 1 iii 4 3}
    5 {three i v i four 4 1} {ii five five five iii}
................................................................................
  }

  6 {"v v"} {
    1 {four v 4 i three} {1 3 [five five] 4 one}
    5 {three i v i four 4 1} {ii [five five five] iii}
  }
} {

  do_execsql_test 5.1.$tn {
    SELECT rowid, highlight(t1, 0, '[', ']'), highlight(t1, 1, '[', ']')
    FROM t1 WHERE t1 MATCH $q
  } $res
}

# Test that the xQueryPhrase() API works with synonyms.
................................................................................
  }
} {
  do_execsql_test 5.2.$tn {
    SELECT rowid, mit(matchinfo(t1, 'x')) FROM t1 WHERE t1 MATCH $q
  } $res
}


#-------------------------------------------------------------------------
# Test terms with more than 4 synonyms.
#
reset_db
sqlite3_fts5_create_tokenizer db tcl tcl_create
proc tcl_tokenize {tflags text} {
  foreach {w iStart iEnd} [fts5_tokenize_split $text] {
................................................................................
        sqlite3_fts5_token -colo [string repeat $w $i] $iStart $iEnd
      }
    }
  }
}

do_execsql_test 6.0.1 {
  CREATE VIRTUAL TABLE t1 USING fts5(x, tokenize=tcl);
  INSERT INTO t1 VALUES('yy xx qq');
  INSERT INTO t1 VALUES('yy xx xx');
}

do_execsql_test 6.0.2 {
  SELECT * FROM t1 WHERE t1 MATCH 'NEAR(y q)';
} {{yy xx qq}}


do_test 6.0.3 {
  execsql { 
    CREATE VIRTUAL TABLE t2 USING fts5(a, b, tokenize=tcl)
  }
  foreach {rowid a b} {
    1 {yyyy vvvvv qq oo yyyyyy vvvv eee} {ffff uu r qq aaaa}
    2 {ww oooooo bbbbb ssssss mm} {ffffff yy iiii rr s ccc qqqqq}
    3 {zzzz llll gggggg cccc uu} {hhhhhh aaaa ppppp rr ee jjjj}
    4 {r f i rrrrrr ww hhh} {aa yyy t x aaaaa ii}
    5 {fffff mm vvvv ooo ffffff kkkk tttt} {cccccc bb e zzz d n}
................................................................................
  }

  4 {NEAR(q y, 20)} {
    1 {[yyyy] vvvvv [qq] oo [yyyyyy] vvvv eee} {ffff uu r qq aaaa}
    2 {ww oooooo bbbbb ssssss mm} {ffffff [yy] iiii rr s ccc [qqqqq]}
  }
} {


  do_execsql_test 6.1.$tn.asc {
    SELECT rowid, highlight(t2, 0, '[', ']'), highlight(t2, 1, '[', ']')
    FROM t2 WHERE t2 MATCH $q
  } $res

  set res2 [list]
  foreach {rowid a b} $res {
................................................................................
        sqlite3_fts5_token -colo [string repeat $w $i] $iStart $iEnd
      }
    }
  }
}

do_execsql_test 7.0.1 {
  CREATE VIRTUAL TABLE t1 USING fts5(a, b, columnsize=1, tokenize=tcl);
  INSERT INTO t1 VALUES('0 2 3', '4 5 6 7');
  INSERT INTO t1 VALUES('8 9', '0 0 0 0 0 0 0 0 0 0');
  SELECT fts5_test_columnsize(t1) FROM t1 WHERE t1 MATCH '000 AND 00 AND 0';
} {{3 4} {2 10}}

do_execsql_test 7.0.2 {
  INSERT INTO t1(t1) VALUES('integrity-check');
}

do_execsql_test 7.1.1 {
  CREATE VIRTUAL TABLE t2 USING fts5(a, b, columnsize=0, tokenize=tcl);
  INSERT INTO t2 VALUES('0 2 3', '4 5 6 7');
  INSERT INTO t2 VALUES('8 9', '0 0 0 0 0 0 0 0 0 0');
  SELECT fts5_test_columnsize(t2) FROM t2 WHERE t2 MATCH '000 AND 00 AND 0';
} {{3 4} {2 10}}

do_execsql_test 7.1.2 {
  INSERT INTO t2(t2) VALUES('integrity-check');
}



finish_test

# If SQLITE_ENABLE_FTS5 is defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}


























proc tcl_create {args} { return "tcl_tokenize" }




foreach_detail_mode $testprefix {

#-------------------------------------------------------------------------
# Warm body test for the code in fts5_tcl.c.
#
fts5_tclnum_register db
do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE ft USING fts5(x, tokenize = "tclnum document", detail=%DETAIL%);
  INSERT INTO ft VALUES('abc def ghi');
  INSERT INTO ft VALUES('jkl mno pqr');
  SELECT rowid, x FROM ft WHERE ft MATCH 'def';
  SELECT x, rowid FROM ft WHERE ft MATCH 'pqr';
} {1 {abc def ghi} {jkl mno pqr} 2}

#-------------------------------------------------------------------------
# Test a tokenizer that supports synonyms by adding extra entries to the
# FTS index.
#











reset_db

fts5_tclnum_register db

do_execsql_test 2.0 {
  CREATE VIRTUAL TABLE ft USING fts5(
      x, tokenize = "tclnum document", detail=%DETAIL%
  );
  INSERT INTO ft VALUES('one two three');
  INSERT INTO ft VALUES('four five six');
  INSERT INTO ft VALUES('eight nine ten');
} {}

foreach {tn expr res} {
  1 "3" 1
  2 "eight OR 8 OR 5" {2 3}
  3 "10" {}
  4 "1*" {1}
  5 "1 + 2" {1}
} {
  if {![fts5_expr_ok $expr ft]} continue
  do_execsql_test 2.1.$tn {
    SELECT rowid FROM ft WHERE ft MATCH $expr
  } $res
}

#-------------------------------------------------------------------------
# Test some broken tokenizers:
................................................................................
  SELECT rowid FROM ft WHERE ft MATCH 'one + two + two + three';
} {}

#-------------------------------------------------------------------------
# Check that expressions with synonyms can be parsed and executed.
#
reset_db
fts5_tclnum_register db











foreach {tn expr res} {
  1  {abc}                           {"abc"}
  2  {one}                           {"one"|"i"|"1"}
  3  {3}                             {"3"|"iii"|"three"}
  4  {3*}                            {"3"|"iii"|"three" *}
} {
  do_execsql_test 4.1.$tn {
    SELECT fts5_expr($expr, 'tokenize=tclnum')
  } [list $res]
}

do_execsql_test 4.2.1 {
  CREATE VIRTUAL TABLE xx USING fts5(x, tokenize=tclnum, detail=%DETAIL%);
  INSERT INTO xx VALUES('one two');
  INSERT INTO xx VALUES('three four');
}

do_execsql_test 4.2.2 {
  SELECT rowid FROM xx WHERE xx MATCH '2'
} {1}
................................................................................

do_execsql_test 4.2.3 {
  SELECT rowid FROM xx WHERE xx MATCH '3'
} {2}

do_test 5.0 {
  execsql { 
    CREATE VIRTUAL TABLE t1 USING fts5(a, b, tokenize=tclnum, detail=%DETAIL%)
  }
  foreach {rowid a b} {
    1 {four v 4 i three} {1 3 five five 4 one}
    2 {5 1 3 4 i} {2 2 v two 4}
    3 {5 i 5 2 four 4 1} {iii ii five two 1}
    4 {ii four 4 one 5 three five} {one 5 1 iii 4 3}
    5 {three i v i four 4 1} {ii five five five iii}
................................................................................
  }

  6 {"v v"} {
    1 {four v 4 i three} {1 3 [five five] 4 one}
    5 {three i v i four 4 1} {ii [five five five] iii}
  }
} {
  if {![fts5_expr_ok $q t1]} continue
  do_execsql_test 5.1.$tn {
    SELECT rowid, highlight(t1, 0, '[', ']'), highlight(t1, 1, '[', ']')
    FROM t1 WHERE t1 MATCH $q
  } $res
}

# Test that the xQueryPhrase() API works with synonyms.
................................................................................
  }
} {
  do_execsql_test 5.2.$tn {
    SELECT rowid, mit(matchinfo(t1, 'x')) FROM t1 WHERE t1 MATCH $q
  } $res
}


#-------------------------------------------------------------------------
# Test terms with more than 4 synonyms.
#
reset_db
sqlite3_fts5_create_tokenizer db tcl tcl_create
proc tcl_tokenize {tflags text} {
  foreach {w iStart iEnd} [fts5_tokenize_split $text] {
................................................................................
        sqlite3_fts5_token -colo [string repeat $w $i] $iStart $iEnd
      }
    }
  }
}

do_execsql_test 6.0.1 {
  CREATE VIRTUAL TABLE t1 USING fts5(x, tokenize=tcl, detail=%DETAIL%);
  INSERT INTO t1 VALUES('yy xx qq');
  INSERT INTO t1 VALUES('yy xx xx');
}
if {[fts5_expr_ok "NEAR(y q)" t1]} {
  do_execsql_test 6.0.2 {
    SELECT * FROM t1 WHERE t1 MATCH 'NEAR(y q)';
  } {{yy xx qq}}
}

do_test 6.0.3 {
  execsql { 
    CREATE VIRTUAL TABLE t2 USING fts5(a, b, tokenize=tcl, detail=%DETAIL%)
  }
  foreach {rowid a b} {
    1 {yyyy vvvvv qq oo yyyyyy vvvv eee} {ffff uu r qq aaaa}
    2 {ww oooooo bbbbb ssssss mm} {ffffff yy iiii rr s ccc qqqqq}
    3 {zzzz llll gggggg cccc uu} {hhhhhh aaaa ppppp rr ee jjjj}
    4 {r f i rrrrrr ww hhh} {aa yyy t x aaaaa ii}
    5 {fffff mm vvvv ooo ffffff kkkk tttt} {cccccc bb e zzz d n}
................................................................................
  }

  4 {NEAR(q y, 20)} {
    1 {[yyyy] vvvvv [qq] oo [yyyyyy] vvvv eee} {ffff uu r qq aaaa}
    2 {ww oooooo bbbbb ssssss mm} {ffffff [yy] iiii rr s ccc [qqqqq]}
  }
} {
  if {![fts5_expr_ok $q t2]} continue

  do_execsql_test 6.1.$tn.asc {
    SELECT rowid, highlight(t2, 0, '[', ']'), highlight(t2, 1, '[', ']')
    FROM t2 WHERE t2 MATCH $q
  } $res

  set res2 [list]
  foreach {rowid a b} $res {
................................................................................
        sqlite3_fts5_token -colo [string repeat $w $i] $iStart $iEnd
      }
    }
  }
}

do_execsql_test 7.0.1 {
  CREATE VIRTUAL TABLE t1 USING fts5(a, b, columnsize=1, tokenize=tcl, detail=%DETAIL%);
  INSERT INTO t1 VALUES('0 2 3', '4 5 6 7');
  INSERT INTO t1 VALUES('8 9', '0 0 0 0 0 0 0 0 0 0');
  SELECT fts5_test_columnsize(t1) FROM t1 WHERE t1 MATCH '000 AND 00 AND 0';
} {{3 4} {2 10}}

do_execsql_test 7.0.2 {
  INSERT INTO t1(t1) VALUES('integrity-check');
}

do_execsql_test 7.1.1 {
  CREATE VIRTUAL TABLE t2 USING fts5(a, b, columnsize=0, tokenize=tcl, detail=%DETAIL%);
  INSERT INTO t2 VALUES('0 2 3', '4 5 6 7');
  INSERT INTO t2 VALUES('8 9', '0 0 0 0 0 0 0 0 0 0');
  SELECT fts5_test_columnsize(t2) FROM t2 WHERE t2 MATCH '000 AND 00 AND 0';
} {{3 4} {2 10}}

do_execsql_test 7.1.2 {
  INSERT INTO t2(t2) VALUES('integrity-check');
}

} ;# foreach_detail_mode

finish_test

# If SQLITE_ENABLE_FTS5 is defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}

#-------------------------------------------------------------------------

# Code for a simple Tcl tokenizer that supports synonyms at query time.
#
foreach SYNDICT {
  {zero  0}
  {one   1 i}
  {two   2 ii}
  {three 3 iii}
  {four  4 iv}
  {five  5 v}
  {six   6 vi}
  {seven 7 vii}
  {eight 8 viii}
  {nine  9 ix}
} {
  foreach s $SYNDICT {
    set o [list]
    foreach x $SYNDICT {if {$x!=$s} {lappend o $x}}
    set ::syn($s) $o
  }


}





proc tcl_tokenize {tflags text} {
  foreach {w iStart iEnd} [fts5_tokenize_split $text] {
    sqlite3_fts5_token $w $iStart $iEnd
    if {$tflags == "query"} {
      foreach s $::syn($w)  { sqlite3_fts5_token -colo $s $iStart $iEnd }
    }
  }
}

proc tcl_create {args} {
  return "tcl_tokenize"
}

#
# End of tokenizer code.
#-------------------------------------------------------------------------

foreach_detail_mode $testprefix {

sqlite3_fts5_create_tokenizer db tcl tcl_create
fts5_aux_test_functions db

do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE ss USING fts5(a, b, tokenize=tcl, detail=%DETAIL%);
  INSERT INTO ss VALUES('5 5 five seven 3 seven i', '2 1 5 0 two 1 i');
  INSERT INTO ss VALUES('six ix iii 7 i vii iii', 'one seven nine 4 9 1 vi');
  INSERT INTO ss VALUES('6 viii i five six zero seven', '5 v iii iv iv 3');
  INSERT INTO ss VALUES('9 ii six 8 1 6', 'six 4 iv iv 7');
  INSERT INTO ss VALUES('1 5 4 eight ii iv iii', 'nine 2 eight ix v vii');
  INSERT INTO ss VALUES('one 7 seven six 2 two', '1 2 four 7 4 3 4');
  INSERT INTO ss VALUES('eight iv 4 nine vii six 1', '5 6 v one zero 4');
................................................................................
  3.3 "a:one OR b:1 OR {a b} : i"

  4.1 "NEAR(one two, 2)"
  4.2 "NEAR(one two three, 2)"
  4.3 "NEAR(eight nine, 1) OR NEAR(six seven, 1)"
} {
  if {[fts5_expr_ok $expr ss]==0} {
    do_test 1.$tn.OMITTED { list } [list]
    continue
  }

  set res [fts5_query_data $expr ss ASC ::syn]
  breakpoint



  do_execsql_test 1.$tn.[llength $res].asc {
    SELECT rowid, fts5_test_poslist(ss), fts5_test_collist(ss) FROM ss($expr)

  } $res
}


}

finish_test

# If SQLITE_ENABLE_FTS5 is defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}


foreach tok {query document} {
foreach_detail_mode $testprefix {

fts5_tclnum_register db
fts5_aux_test_functions db















proc fts5_rowid {cmd} { expr [$cmd xColumnText -1] }
sqlite3_fts5_create_function db fts5_rowid fts5_rowid

do_execsql_test 1.$tok.0.1 "
  CREATE VIRTUAL TABLE ss USING fts5(a, b, 
       tokenize='tclnum $tok', detail=%DETAIL%);
  INSERT INTO ss(ss, rank) VALUES('rank', 'fts5_rowid()');
"






















do_execsql_test 1.$tok.0.2 {

  INSERT INTO ss VALUES('5 5 five seven 3 seven i', '2 1 5 0 two 1 i');
  INSERT INTO ss VALUES('six ix iii 7 i vii iii', 'one seven nine 4 9 1 vi');
  INSERT INTO ss VALUES('6 viii i five six zero seven', '5 v iii iv iv 3');
  INSERT INTO ss VALUES('9 ii six 8 1 6', 'six 4 iv iv 7');
  INSERT INTO ss VALUES('1 5 4 eight ii iv iii', 'nine 2 eight ix v vii');
  INSERT INTO ss VALUES('one 7 seven six 2 two', '1 2 four 7 4 3 4');
  INSERT INTO ss VALUES('eight iv 4 nine vii six 1', '5 6 v one zero 4');
................................................................................
  3.3 "a:one OR b:1 OR {a b} : i"

  4.1 "NEAR(one two, 2)"
  4.2 "NEAR(one two three, 2)"
  4.3 "NEAR(eight nine, 1) OR NEAR(six seven, 1)"
} {
  if {[fts5_expr_ok $expr ss]==0} {
    do_test 1.$tok.$tn.OMITTED { list } [list]
    continue
  }

  set res [fts5_query_data $expr ss ASC ::tclnum_syn]
  do_execsql_test 1.$tok.$tn.[llength $res].asc.1 {
    SELECT rowid, fts5_test_poslist(ss), fts5_test_collist(ss) FROM ss($expr)
  } $res

  do_execsql_test 1.$tok.$tn.[llength $res].asc.2 {
    SELECT rowid, fts5_test_poslist(ss), fts5_test_collist(ss) FROM ss($expr)
    ORDER BY rank ASC
  } $res
}

}
}

finish_test

# 2016 Jan 15
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#*************************************************************************
#

source [file join [file dirname [info script]] fts5_common.tcl]
ifcapable !fts5 { finish_test ; return }
set ::testprefix fts5tok1


sqlite3_fts5_register_fts5tokenize db

#-------------------------------------------------------------------------
# Simple test cases. Using the default (ascii) tokenizer.
#
do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE t1 USING fts5tokenize(ascii);
  CREATE VIRTUAL TABLE t2 USING fts5tokenize();
  CREATE VIRTUAL TABLE t3 USING fts5tokenize(
      ascii, 'separators', 'xyz', tokenchars, ''''
  );
}

foreach {tn tbl} {1 t1 2 t2 3 t3} {
  do_execsql_test 1.$tn.1 "SELECT input, * FROM $tbl ('one two three')" {
    {one two three} one   0  3 0 
    {one two three} two   4  7 1 
    {one two three} three 8 13 2
  }

  do_execsql_test 1.$tn.2 "
    SELECT token FROM $tbl WHERE input = 'OnE tWo tHrEe'
  " {
    one two three
  }
}

do_execsql_test 1.4 {
  SELECT token FROM t3 WHERE input = '1x2x3x'
} {1 2 3}

do_execsql_test 1.5 {
  SELECT token FROM t1 WHERE input = '1x2x3x'
} {1x2x3x}

do_execsql_test 1.6 {
  SELECT token FROM t3 WHERE input = '1''2x3x'
} {1'2 3}

do_execsql_test 1.7 {
  SELECT token FROM t3 WHERE input = ''
} {}

do_execsql_test 1.8 {
  SELECT token FROM t3 WHERE input = NULL
} {}

do_execsql_test 1.9 {
  SELECT input, * FROM t3 WHERE input = 123
} {123 123 0 3 0}

do_execsql_test 1.10 {
  SELECT input, * FROM t1 WHERE input = 'a b c' AND token = 'b';
} {
  {a b c} b 2 3 1
}

do_execsql_test 1.11 {
  SELECT input, * FROM t1 WHERE token = 'b' AND input = 'a b c';
} {
  {a b c} b 2 3 1
}

do_execsql_test 1.12 {
  SELECT input, * FROM t1 WHERE input < 'b' AND input = 'a b c';
} {
  {a b c} a 0 1 0 
  {a b c} b 2 3 1 
  {a b c} c 4 5 2
}

do_execsql_test 1.13.1 {
  CREATE TABLE c1(x);
  INSERT INTO c1(x) VALUES('a b c');
  INSERT INTO c1(x) VALUES('d e f');
}
do_execsql_test 1.13.2 {
  SELECT c1.*, input, t1.* FROM c1, t1 WHERE input = x AND c1.rowid=t1.rowid;
} {
  {a b c} {a b c} a 0 1 0 
  {d e f} {d e f} e 2 3 1 
}


#-------------------------------------------------------------------------
# Error cases.
#
do_catchsql_test 2.0 {
  CREATE VIRTUAL TABLE tX USING fts5tokenize(nosuchtokenizer);
} {1 {vtable constructor failed: tX}}

do_catchsql_test 2.1 {
  CREATE VIRTUAL TABLE t4 USING fts5tokenize;
  SELECT * FROM t4;
} {1 {SQL logic error or missing database}}


finish_test

# 2016 Jan 15
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#*************************************************************************
#

source [file join [file dirname [info script]] fts5_common.tcl]
ifcapable !fts5||!fts3 { finish_test ; return }
set ::testprefix fts5tok2

sqlite3_fts5_register_fts5tokenize db

#-------------------------------------------------------------------------
# Simple test cases. Using the default (ascii) tokenizer.
#
do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE t5 USING fts5tokenize(unicode61);
  CREATE VIRTUAL TABLE t3 USING fts3tokenize(unicode61);
}

do_test 1.1 {
  array unset -nocomplain A

  for {set i 1} {$i < 65536} {incr i} {
    set input [format "abc%cxyz" $i]
      set expect [execsql {
        SELECT input, token, start, end FROM t3 WHERE input=$input
    }]

    incr A([llength $expect])

    set res [execsql {
      SELECT input, token, start, end FROM t5($input)
    }]
    if {$res != $expect} {error "failed at i=$i"}
  }
} {}

do_test 1.1.nTokenChars=$A(4).nSeparators=$A(8) {} {}

finish_test

# 2016 Jan 16
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#*************************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this script is testing the FTS5 module.
#

source [file join [file dirname [info script]] fts5_common.tcl]
set testprefix fts5update

# If SQLITE_ENABLE_FTS5 is not defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}

set docs {
  "eight zero iv eight 7"            "ix one 8 one three ii one"        
  "1 9 9 three viii"                 "5 zero ii 6 nine ix 3"            
  "3 zero 5 2 seven nine"            "two eight viii eight 1"           
  "4 six two 5 9 vii"                "viii ii four 8 i i iv"            
  "vii 0 iv seven 7 viii"            "five 1 nine vi seven"             
  "1 zero zero iii 1"                "one one six 6 nine seven"         
  "one v 4 zero 4 iii ii"            "2 3 eight six ix"                 
  "six iv 7 three 5"                 "ix zero 0 8 ii 7 3"               
  "four six nine 2 vii 3"            "five viii 5 8 0 7"                
}

foreach_detail_mode $::testprefix {

do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(a, b, detail=%DETAIL%);
} {}

do_test 1.1 {
  foreach {a b} $docs {
    execsql {INSERT INTO t1 VALUES($a, $b)}
  }
} {}

proc update {iRowid iA iB} {
  set a [lindex $::docs $iA]
  set b [lindex $::docs $iB]
  execsql { UPDATE t1 SET a=$a, b=$b WHERE rowid=$iRowid }
}

set nDoc [llength $::docs]
foreach n {1 5 10 50 100} {
  do_test 1.2.$n {
    execsql BEGIN
    for {set i 1} {$i <= 1000} {incr i} {
      set iRowid [expr {int(rand() * ($nDoc/2)) + 1}]
      set iA [expr {int(rand() * $nDoc)}]
      set iB [expr {int(rand() * $nDoc)}]
      update $iRowid $iA $iB

      if {($i % $n)==0} {
        execsql { COMMIT; BEGIN }
      }

      if {($i % $n)==100} {
        execsql { INSERT INTO t1(t1) VALUES('integrity-check') }
      }
    }
    execsql COMMIT
    execsql { INSERT INTO t1(t1) VALUES('integrity-check') }
  } {}
}

do_execsql_test 1.3 {
  UPDATE t1 SET a=a AND b=b;
  INSERT INTO t1(t1) VALUES('integrity-check');
}

do_test 1.4 {
  execsql { INSERT INTO t1(t1, rank) VALUES('pgsz', 32) }
  for {set i 0} {$i < 50} {incr i} {
    execsql { UPDATE t1 SET a=a AND b=b }
    execsql { INSERT INTO t1(t1) VALUES('integrity-check') }
  }
} {}

#-------------------------------------------------------------------------
# Lots of deletes/inserts of the same document with the same rowid.
#
do_execsql_test 2.0 {
  CREATE VIRTUAL TABLE x2 USING fts5(x, detail=%DETAIL%);
  INSERT INTO x2(x2, rank) VALUES('crisismerge', 2);
  INSERT INTO x2 VALUES('a b c');
  INSERT INTO x2 VALUES('a b c');
}
do_test 2.1 {
  for {set i 0} {$i < 1000} {incr i} {
    execsql { DELETE FROM x2 WHERE rowid = 2 }
    execsql { INSERT INTO x2(rowid, x) VALUES(2, 'a b c') }
  }
} {}
do_execsql_test 2.1.integrity {
  INSERT INTO x2(x2) VALUES('integrity-check');
}

do_test 2.2 {
  for {set i 0} {$i < 1000} {incr i} {
    execsql { UPDATE x2 SET x=x WHERE rowid=2 }
  }
} {}
do_execsql_test 2.2.integrity {
  INSERT INTO x2(x2) VALUES('integrity-check');
}

}
finish_test

  if {[detail_is_none]==0} { error "this is for detail=none mode" }
  set ret [list]
  foreach {a b c} $L {
    lappend ret $a {} $b {}
  }
  set ret
}



do_execsql_test 1.1.1 {
  CREATE VIRTUAL TABLE t1 USING fts5(one, prefix=1, detail=%DETAIL%);
  CREATE VIRTUAL TABLE v1 USING fts5vocab(t1, 'row');
  PRAGMA table_info = v1;
} {
  0 term {} 0 {} 0
................................................................................
if {![detail_is_none]} {
  do_execsql_test 7.3.2 {
    SELECT count(*) FROM txc, txc_c
      WHERE txc.term = txc_c.term AND txc.col=txc_c.col;
  } {57}
}

}





















































finish_test

  if {[detail_is_none]==0} { error "this is for detail=none mode" }
  set ret [list]
  foreach {a b c} $L {
    lappend ret $a {} $b {}
  }
  set ret
}

if 1 {

do_execsql_test 1.1.1 {
  CREATE VIRTUAL TABLE t1 USING fts5(one, prefix=1, detail=%DETAIL%);
  CREATE VIRTUAL TABLE v1 USING fts5vocab(t1, 'row');
  PRAGMA table_info = v1;
} {
  0 term {} 0 {} 0
................................................................................
if {![detail_is_none]} {
  do_execsql_test 7.3.2 {
    SELECT count(*) FROM txc, txc_c
      WHERE txc.term = txc_c.term AND txc.col=txc_c.col;
  } {57}
}

}

#-------------------------------------------------------------------------
# Test the fts5vocab tables response to a specific types of corruption:
# where the fts5 index contains hits for columns that do not exist.
#
do_execsql_test 8.0 {
  CREATE VIRTUAL TABLE x1 USING fts5(a, b, c, detail=%DETAIL%);
  INSERT INTO x1 VALUES('a b c', 'd e f', 'g h i');
  INSERT INTO x1 VALUES('g h i', 'a b c', 'd e f');
  INSERT INTO x1 VALUES('d e f', 'g h i', 'a b c');
  CREATE VIRTUAL TABLE x1_r USING fts5vocab(x1, row);
  CREATE VIRTUAL TABLE x1_c USING fts5vocab(x1, col);
}

set resr [star_from_row {a 3 3 b 3 3 c 3 3 d 3 3 e 3 3 f 3 3 g 3 3 h 3 3 i 3 3}]
set resc [star_from_col {
  a a 1 1 a b 1 1 a c 1 1 b a 1 1 
  b b 1 1 b c 1 1 c a 1 1 c b 1 1 
  c c 1 1 d a 1 1 d b 1 1 d c 1 1
  e a 1 1 e b 1 1 e c 1 1 f a 1 1 
  f b 1 1 f c 1 1 g a 1 1 g b 1 1 
  g c 1 1 h a 1 1 h b 1 1 h c 1 1 
  i a 1 1 i b 1 1 i c 1 1
}]
if {[detail_is_none]} { set resc [row_to_col $resr] }

do_execsql_test 8.1.1 { SELECT * FROM x1_r; } $resr
do_execsql_test 8.1.2 { SELECT * FROM x1_c } $resc

do_execsql_test 8.2 {
  PRAGMA writable_schema = 1;
  UPDATE sqlite_master 
  SET sql = 'CREATE VIRTUAL TABLE x1 USING fts5(a, detail=%DETAIL%)'
  WHERE name = 'x1';
}
db close
sqlite3 db test.db
sqlite3_fts5_may_be_corrupt 1

do_execsql_test 8.2.1 { SELECT * FROM x1_r } $resr

if {[detail_is_none]} {
  do_execsql_test 8.2.2 { SELECT * FROM x1_c } $resc
} else {
  do_catchsql_test 8.2.2 { 
    SELECT * FROM x1_c 
  } {1 {database disk image is malformed}}
}

sqlite3_fts5_may_be_corrupt 0

}

finish_test

  $(TOP)/ext/misc/regexp.c \
  $(TOP)/ext/misc/series.c \
  $(TOP)/ext/misc/spellfix.c \
  $(TOP)/ext/misc/totype.c \
  $(TOP)/ext/misc/wholenumber.c \
  $(TOP)/ext/misc/vfslog.c \
  $(TOP)/ext/fts5/fts5_tcl.c \
  $(TOP)/ext/fts5/fts5_test_mi.c



#TESTSRC += $(TOP)/ext/fts2/fts2_tokenizer.c
#TESTSRC += $(TOP)/ext/fts3/fts3_tokenizer.c

TESTSRC2 = \
  $(TOP)/src/attach.c \

  $(TOP)/ext/misc/regexp.c \
  $(TOP)/ext/misc/series.c \
  $(TOP)/ext/misc/spellfix.c \
  $(TOP)/ext/misc/totype.c \
  $(TOP)/ext/misc/wholenumber.c \
  $(TOP)/ext/misc/vfslog.c \
  $(TOP)/ext/fts5/fts5_tcl.c \
  $(TOP)/ext/fts5/fts5_test_mi.c \
  $(TOP)/ext/fts5/fts5_test_tok.c 


#TESTSRC += $(TOP)/ext/fts2/fts2_tokenizer.c
#TESTSRC += $(TOP)/ext/fts3/fts3_tokenizer.c

TESTSRC2 = \
  $(TOP)/src/attach.c \

  sqlite3_result_blob(context, p, sizeof(*p), stat4Destructor);
}
static const FuncDef statInitFuncdef = {
  2+IsStat34,      /* nArg */
  SQLITE_UTF8,     /* funcFlags */
  0,               /* pUserData */
  0,               /* pNext */
  statInit,        /* xFunc */
  0,               /* xStep */
  0,               /* xFinalize */
  "stat_init",     /* zName */
  0,               /* pHash */
  0                /* pDestructor */
};

#ifdef SQLITE_ENABLE_STAT4
................................................................................
#endif
}
static const FuncDef statPushFuncdef = {
  2+IsStat34,      /* nArg */
  SQLITE_UTF8,     /* funcFlags */
  0,               /* pUserData */
  0,               /* pNext */
  statPush,        /* xFunc */
  0,               /* xStep */
  0,               /* xFinalize */
  "stat_push",     /* zName */
  0,               /* pHash */
  0                /* pDestructor */
};

#define STAT_GET_STAT1 0          /* "stat" column of stat1 table */
................................................................................
#endif
}
static const FuncDef statGetFuncdef = {
  1+IsStat34,      /* nArg */
  SQLITE_UTF8,     /* funcFlags */
  0,               /* pUserData */
  0,               /* pNext */
  statGet,         /* xFunc */
  0,               /* xStep */
  0,               /* xFinalize */
  "stat_get",      /* zName */
  0,               /* pHash */
  0                /* pDestructor */
};

static void callStatGet(Vdbe *v, int regStat4, int iParam, int regOut){
................................................................................
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
  sqlite3VdbeAddOp2(v, OP_Integer, iParam, regStat4+1);
#elif SQLITE_DEBUG
  assert( iParam==STAT_GET_STAT1 );
#else
  UNUSED_PARAMETER( iParam );
#endif
  sqlite3VdbeAddOp3(v, OP_Function0, 0, regStat4, regOut);
  sqlite3VdbeChangeP4(v, -1, (char*)&statGetFuncdef, P4_FUNCDEF);
  sqlite3VdbeChangeP5(v, 1 + IsStat34);
}

/*
** Generate code to do an analysis of all indices associated with
** a single table.
*/
................................................................................
    ** The third argument is only used for STAT3 and STAT4
    */
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
    sqlite3VdbeAddOp2(v, OP_Count, iIdxCur, regStat4+3);
#endif
    sqlite3VdbeAddOp2(v, OP_Integer, nCol, regStat4+1);
    sqlite3VdbeAddOp2(v, OP_Integer, pIdx->nKeyCol, regStat4+2);
    sqlite3VdbeAddOp3(v, OP_Function0, 0, regStat4+1, regStat4);
    sqlite3VdbeChangeP4(v, -1, (char*)&statInitFuncdef, P4_FUNCDEF);
    sqlite3VdbeChangeP5(v, 2+IsStat34);

    /* Implementation of the following:
    **
    **   Rewind csr
    **   if eof(csr) goto end_of_scan;
    **   regChng = 0
................................................................................
        VdbeComment((v, "%s", pTab->aCol[pPk->aiColumn[j]].zName));
      }
      sqlite3VdbeAddOp3(v, OP_MakeRecord, regKey, pPk->nKeyCol, regRowid);
      sqlite3ReleaseTempRange(pParse, regKey, pPk->nKeyCol);
    }
#endif
    assert( regChng==(regStat4+1) );
    sqlite3VdbeAddOp3(v, OP_Function0, 1, regStat4, regTemp);
    sqlite3VdbeChangeP4(v, -1, (char*)&statPushFuncdef, P4_FUNCDEF);
    sqlite3VdbeChangeP5(v, 2+IsStat34);
    sqlite3VdbeAddOp2(v, OP_Next, iIdxCur, addrNextRow); VdbeCoverage(v);

    /* Add the entry to the stat1 table. */
    callStatGet(v, regStat4, STAT_GET_STAT1, regStat1);
    assert( "BBB"[0]==SQLITE_AFF_TEXT );
    sqlite3VdbeAddOp4(v, OP_MakeRecord, regTabname, 3, regTemp, "BBB", 0);

  sqlite3_result_blob(context, p, sizeof(*p), stat4Destructor);
}
static const FuncDef statInitFuncdef = {
  2+IsStat34,      /* nArg */
  SQLITE_UTF8,     /* funcFlags */
  0,               /* pUserData */
  0,               /* pNext */
  statInit,        /* xSFunc */

  0,               /* xFinalize */
  "stat_init",     /* zName */
  0,               /* pHash */
  0                /* pDestructor */
};

#ifdef SQLITE_ENABLE_STAT4
................................................................................
#endif
}
static const FuncDef statPushFuncdef = {
  2+IsStat34,      /* nArg */
  SQLITE_UTF8,     /* funcFlags */
  0,               /* pUserData */
  0,               /* pNext */
  statPush,        /* xSFunc */

  0,               /* xFinalize */
  "stat_push",     /* zName */
  0,               /* pHash */
  0                /* pDestructor */
};

#define STAT_GET_STAT1 0          /* "stat" column of stat1 table */
................................................................................
#endif
}
static const FuncDef statGetFuncdef = {
  1+IsStat34,      /* nArg */
  SQLITE_UTF8,     /* funcFlags */
  0,               /* pUserData */
  0,               /* pNext */
  statGet,         /* xSFunc */

  0,               /* xFinalize */
  "stat_get",      /* zName */
  0,               /* pHash */
  0                /* pDestructor */
};

static void callStatGet(Vdbe *v, int regStat4, int iParam, int regOut){
................................................................................
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
  sqlite3VdbeAddOp2(v, OP_Integer, iParam, regStat4+1);
#elif SQLITE_DEBUG
  assert( iParam==STAT_GET_STAT1 );
#else
  UNUSED_PARAMETER( iParam );
#endif
  sqlite3VdbeAddOp4(v, OP_Function0, 0, regStat4, regOut,
                    (char*)&statGetFuncdef, P4_FUNCDEF);
  sqlite3VdbeChangeP5(v, 1 + IsStat34);
}

/*
** Generate code to do an analysis of all indices associated with
** a single table.
*/
................................................................................
    ** The third argument is only used for STAT3 and STAT4
    */
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
    sqlite3VdbeAddOp2(v, OP_Count, iIdxCur, regStat4+3);
#endif
    sqlite3VdbeAddOp2(v, OP_Integer, nCol, regStat4+1);
    sqlite3VdbeAddOp2(v, OP_Integer, pIdx->nKeyCol, regStat4+2);
    sqlite3VdbeAddOp4(v, OP_Function0, 0, regStat4+1, regStat4,
                     (char*)&statInitFuncdef, P4_FUNCDEF);
    sqlite3VdbeChangeP5(v, 2+IsStat34);

    /* Implementation of the following:
    **
    **   Rewind csr
    **   if eof(csr) goto end_of_scan;
    **   regChng = 0
................................................................................
        VdbeComment((v, "%s", pTab->aCol[pPk->aiColumn[j]].zName));
      }
      sqlite3VdbeAddOp3(v, OP_MakeRecord, regKey, pPk->nKeyCol, regRowid);
      sqlite3ReleaseTempRange(pParse, regKey, pPk->nKeyCol);
    }
#endif
    assert( regChng==(regStat4+1) );
    sqlite3VdbeAddOp4(v, OP_Function0, 1, regStat4, regTemp,
                     (char*)&statPushFuncdef, P4_FUNCDEF);
    sqlite3VdbeChangeP5(v, 2+IsStat34);
    sqlite3VdbeAddOp2(v, OP_Next, iIdxCur, addrNextRow); VdbeCoverage(v);

    /* Add the entry to the stat1 table. */
    callStatGet(v, regStat4, STAT_GET_STAT1, regStat1);
    assert( "BBB"[0]==SQLITE_AFF_TEXT );
    sqlite3VdbeAddOp4(v, OP_MakeRecord, regTabname, 3, regTemp, "BBB", 0);

  regArgs = sqlite3GetTempRange(pParse, 4);
  sqlite3ExprCode(pParse, pFilename, regArgs);
  sqlite3ExprCode(pParse, pDbname, regArgs+1);
  sqlite3ExprCode(pParse, pKey, regArgs+2);

  assert( v || db->mallocFailed );
  if( v ){
    sqlite3VdbeAddOp3(v, OP_Function0, 0, regArgs+3-pFunc->nArg, regArgs+3);

    assert( pFunc->nArg==-1 || (pFunc->nArg&0xff)==pFunc->nArg );
    sqlite3VdbeChangeP5(v, (u8)(pFunc->nArg));
    sqlite3VdbeChangeP4(v, -1, (char *)pFunc, P4_FUNCDEF);

    /* Code an OP_Expire. For an ATTACH statement, set P1 to true (expire this
    ** statement only). For DETACH, set it to false (expire all existing
    ** statements).
    */
    sqlite3VdbeAddOp1(v, OP_Expire, (type==SQLITE_ATTACH));
  }
  
................................................................................
*/
void sqlite3Detach(Parse *pParse, Expr *pDbname){
  static const FuncDef detach_func = {
    1,                /* nArg */
    SQLITE_UTF8,      /* funcFlags */
    0,                /* pUserData */
    0,                /* pNext */
    detachFunc,       /* xFunc */
    0,                /* xStep */
    0,                /* xFinalize */
    "sqlite_detach",  /* zName */
    0,                /* pHash */
    0                 /* pDestructor */
  };
  codeAttach(pParse, SQLITE_DETACH, &detach_func, pDbname, 0, 0, pDbname);
}
................................................................................
*/
void sqlite3Attach(Parse *pParse, Expr *p, Expr *pDbname, Expr *pKey){
  static const FuncDef attach_func = {
    3,                /* nArg */
    SQLITE_UTF8,      /* funcFlags */
    0,                /* pUserData */
    0,                /* pNext */
    attachFunc,       /* xFunc */
    0,                /* xStep */
    0,                /* xFinalize */
    "sqlite_attach",  /* zName */
    0,                /* pHash */
    0                 /* pDestructor */
  };
  codeAttach(pParse, SQLITE_ATTACH, &attach_func, p, p, pDbname, pKey);
}

  regArgs = sqlite3GetTempRange(pParse, 4);
  sqlite3ExprCode(pParse, pFilename, regArgs);
  sqlite3ExprCode(pParse, pDbname, regArgs+1);
  sqlite3ExprCode(pParse, pKey, regArgs+2);

  assert( v || db->mallocFailed );
  if( v ){
    sqlite3VdbeAddOp4(v, OP_Function0, 0, regArgs+3-pFunc->nArg, regArgs+3,
                      (char *)pFunc, P4_FUNCDEF);
    assert( pFunc->nArg==-1 || (pFunc->nArg&0xff)==pFunc->nArg );
    sqlite3VdbeChangeP5(v, (u8)(pFunc->nArg));

 
    /* Code an OP_Expire. For an ATTACH statement, set P1 to true (expire this
    ** statement only). For DETACH, set it to false (expire all existing
    ** statements).
    */
    sqlite3VdbeAddOp1(v, OP_Expire, (type==SQLITE_ATTACH));
  }
  
................................................................................
*/
void sqlite3Detach(Parse *pParse, Expr *pDbname){
  static const FuncDef detach_func = {
    1,                /* nArg */
    SQLITE_UTF8,      /* funcFlags */
    0,                /* pUserData */
    0,                /* pNext */
    detachFunc,       /* xSFunc */

    0,                /* xFinalize */
    "sqlite_detach",  /* zName */
    0,                /* pHash */
    0                 /* pDestructor */
  };
  codeAttach(pParse, SQLITE_DETACH, &detach_func, pDbname, 0, 0, pDbname);
}
................................................................................
*/
void sqlite3Attach(Parse *pParse, Expr *p, Expr *pDbname, Expr *pKey){
  static const FuncDef attach_func = {
    3,                /* nArg */
    SQLITE_UTF8,      /* funcFlags */
    0,                /* pUserData */
    0,                /* pNext */
    attachFunc,       /* xSFunc */

    0,                /* xFinalize */
    "sqlite_attach",  /* zName */
    0,                /* pHash */
    0                 /* pDestructor */
  };
  codeAttach(pParse, SQLITE_ATTACH, &attach_func, p, p, pDbname, pKey);
}

    ** invariant.
    **
    ** This must be done in advance.  Once the balance starts, the cell
    ** offset section of the btree page will be overwritten and we will no
    ** long be able to find the cells if a pointer to each cell is not saved
    ** first.
    */
    memset(&b.szCell[b.nCell], 0, sizeof(b.szCell[0])*limit);
    if( pOld->nOverflow>0 ){
      memset(&b.szCell[b.nCell+limit], 0, sizeof(b.szCell[0])*pOld->nOverflow);
      limit = pOld->aiOvfl[0];
      for(j=0; j<limit; j++){
        b.apCell[b.nCell] = aData + (maskPage & get2byteAligned(piCell));
        piCell += 2;
        b.nCell++;
      }
      for(k=0; k<pOld->nOverflow; k++){
................................................................................
  **
  ** This error is caught long before control reaches this point.
  */
  if( NEVER(pBt->pCursor) ){
    sqlite3ConnectionBlocked(p->db, pBt->pCursor->pBtree->db);
    return SQLITE_LOCKED_SHAREDCACHE;
  }









  rc = btreeGetPage(pBt, (Pgno)iTable, &pPage, 0);
  if( rc ) return rc;
  rc = sqlite3BtreeClearTable(p, iTable, 0);
  if( rc ){
    releasePage(pPage);
    return rc;
  }

  *piMoved = 0;

  if( iTable>1 ){
#ifdef SQLITE_OMIT_AUTOVACUUM
    freePage(pPage, &rc);
    releasePage(pPage);
#else
    if( pBt->autoVacuum ){
      Pgno maxRootPgno;
      sqlite3BtreeGetMeta(p, BTREE_LARGEST_ROOT_PAGE, &maxRootPgno);

      if( iTable==maxRootPgno ){
        /* If the table being dropped is the table with the largest root-page
        ** number in the database, put the root page on the free list. 
        */
        freePage(pPage, &rc);
        releasePage(pPage);
        if( rc!=SQLITE_OK ){
          return rc;
        }
      }else{
        /* The table being dropped does not have the largest root-page
        ** number in the database. So move the page that does into the 
        ** gap left by the deleted root-page.
        */
        MemPage *pMove;
        releasePage(pPage);
        rc = btreeGetPage(pBt, maxRootPgno, &pMove, 0);
        if( rc!=SQLITE_OK ){
          return rc;
        }
        rc = relocatePage(pBt, pMove, PTRMAP_ROOTPAGE, 0, iTable, 0);
        releasePage(pMove);
        if( rc!=SQLITE_OK ){
          return rc;
        }
        pMove = 0;
        rc = btreeGetPage(pBt, maxRootPgno, &pMove, 0);
        freePage(pMove, &rc);
        releasePage(pMove);
        if( rc!=SQLITE_OK ){
          return rc;
        }
        *piMoved = maxRootPgno;
      }

      /* Set the new 'max-root-page' value in the database header. This
      ** is the old value less one, less one more if that happens to
      ** be a root-page number, less one again if that is the
      ** PENDING_BYTE_PAGE.
      */
      maxRootPgno--;
      while( maxRootPgno==PENDING_BYTE_PAGE(pBt)
             || PTRMAP_ISPAGE(pBt, maxRootPgno) ){
        maxRootPgno--;
      }
      assert( maxRootPgno!=PENDING_BYTE_PAGE(pBt) );

      rc = sqlite3BtreeUpdateMeta(p, 4, maxRootPgno);
    }else{
      freePage(pPage, &rc);
      releasePage(pPage);
    }
#endif
  }else{
    /* If sqlite3BtreeDropTable was called on page 1.
    ** This really never should happen except in a corrupt
    ** database. 
    */
    zeroPage(pPage, PTF_INTKEY|PTF_LEAF );
    releasePage(pPage);
  }
  return rc;  
}
int sqlite3BtreeDropTable(Btree *p, int iTable, int *piMoved){
  int rc;
  sqlite3BtreeEnter(p);
  rc = btreeDropTable(p, iTable, piMoved);
  sqlite3BtreeLeave(p);

    ** invariant.
    **
    ** This must be done in advance.  Once the balance starts, the cell
    ** offset section of the btree page will be overwritten and we will no
    ** long be able to find the cells if a pointer to each cell is not saved
    ** first.
    */
    memset(&b.szCell[b.nCell], 0, sizeof(b.szCell[0])*(limit+pOld->nOverflow));
    if( pOld->nOverflow>0 ){

      limit = pOld->aiOvfl[0];
      for(j=0; j<limit; j++){
        b.apCell[b.nCell] = aData + (maskPage & get2byteAligned(piCell));
        piCell += 2;
        b.nCell++;
      }
      for(k=0; k<pOld->nOverflow; k++){
................................................................................
  **
  ** This error is caught long before control reaches this point.
  */
  if( NEVER(pBt->pCursor) ){
    sqlite3ConnectionBlocked(p->db, pBt->pCursor->pBtree->db);
    return SQLITE_LOCKED_SHAREDCACHE;
  }

  /*
  ** It is illegal to drop the sqlite_master table on page 1.  But again,
  ** this error is caught long before reaching this point.
  */
  if( NEVER(iTable<2) ){
    return SQLITE_CORRUPT_BKPT;
  }

  rc = btreeGetPage(pBt, (Pgno)iTable, &pPage, 0);
  if( rc ) return rc;
  rc = sqlite3BtreeClearTable(p, iTable, 0);
  if( rc ){
    releasePage(pPage);
    return rc;
  }

  *piMoved = 0;


#ifdef SQLITE_OMIT_AUTOVACUUM
  freePage(pPage, &rc);
  releasePage(pPage);
#else
  if( pBt->autoVacuum ){
    Pgno maxRootPgno;
    sqlite3BtreeGetMeta(p, BTREE_LARGEST_ROOT_PAGE, &maxRootPgno);

    if( iTable==maxRootPgno ){
      /* If the table being dropped is the table with the largest root-page
      ** number in the database, put the root page on the free list. 
      */
      freePage(pPage, &rc);
      releasePage(pPage);
      if( rc!=SQLITE_OK ){
        return rc;
      }
    }else{
      /* The table being dropped does not have the largest root-page
      ** number in the database. So move the page that does into the 
      ** gap left by the deleted root-page.
      */
      MemPage *pMove;
      releasePage(pPage);
      rc = btreeGetPage(pBt, maxRootPgno, &pMove, 0);
      if( rc!=SQLITE_OK ){
        return rc;
      }
      rc = relocatePage(pBt, pMove, PTRMAP_ROOTPAGE, 0, iTable, 0);
      releasePage(pMove);
      if( rc!=SQLITE_OK ){
        return rc;
      }
      pMove = 0;
      rc = btreeGetPage(pBt, maxRootPgno, &pMove, 0);
      freePage(pMove, &rc);
      releasePage(pMove);
      if( rc!=SQLITE_OK ){
        return rc;
      }
      *piMoved = maxRootPgno;
    }

    /* Set the new 'max-root-page' value in the database header. This
    ** is the old value less one, less one more if that happens to
    ** be a root-page number, less one again if that is the
    ** PENDING_BYTE_PAGE.
    */
    maxRootPgno--;
    while( maxRootPgno==PENDING_BYTE_PAGE(pBt)
           || PTRMAP_ISPAGE(pBt, maxRootPgno) ){
      maxRootPgno--;
    }
    assert( maxRootPgno!=PENDING_BYTE_PAGE(pBt) );

    rc = sqlite3BtreeUpdateMeta(p, 4, maxRootPgno);
  }else{
    freePage(pPage, &rc);
    releasePage(pPage);
  }
#endif








  return rc;  
}
int sqlite3BtreeDropTable(Btree *p, int iTable, int *piMoved){
  int rc;
  sqlite3BtreeEnter(p);
  rc = btreeDropTable(p, iTable, piMoved);
  sqlite3BtreeLeave(p);

  if( v && pParse->nErr==0 && !db->mallocFailed ){
    assert( pParse->iCacheLevel==0 );  /* Disables and re-enables match */
    /* A minimum of one cursor is required if autoincrement is used
    *  See ticket [a696379c1f08866] */
    if( pParse->pAinc!=0 && pParse->nTab==0 ) pParse->nTab = 1;
    sqlite3VdbeMakeReady(v, pParse);
    pParse->rc = SQLITE_DONE;
    pParse->colNamesSet = 0;
  }else{
    pParse->rc = SQLITE_ERROR;
  }




  pParse->nTab = 0;
  pParse->nMem = 0;
  pParse->nSet = 0;
  pParse->nVar = 0;
  DbMaskZero(pParse->cookieMask);

}

/*
** Run the parser and code generator recursively in order to generate
** code for the SQL statement given onto the end of the pParse context
** currently under construction.  When the parser is run recursively
** this way, the final OP_Halt is not appended and other initialization
................................................................................
      continue;
    }
    if( j<i ){
      db->aDb[j] = db->aDb[i];
    }
    j++;
  }
  memset(&db->aDb[j], 0, (db->nDb-j)*sizeof(db->aDb[j]));
  db->nDb = j;
  if( db->nDb<=2 && db->aDb!=db->aDbStatic ){
    memcpy(db->aDbStatic, db->aDb, 2*sizeof(db->aDb[0]));
    sqlite3DbFree(db, db->aDb);
    db->aDb = db->aDbStatic;
  }
}
................................................................................
  Token *pName1,      /* The "xxx" in the name "xxx.yyy" or "xxx" */
  Token *pName2,      /* The "yyy" in the name "xxx.yyy" */
  Token **pUnqual     /* Write the unqualified object name here */
){
  int iDb;                    /* Database holding the object */
  sqlite3 *db = pParse->db;


  if( ALWAYS(pName2!=0) && pName2->n>0 ){
    if( db->init.busy ) {
      sqlite3ErrorMsg(pParse, "corrupt database");
      return -1;
    }
    *pUnqual = pName2;
    iDb = sqlite3FindDb(db, pName1);
    if( iDb<0 ){
................................................................................
  Table *pTable;
  char *zName = 0; /* The name of the new table */
  sqlite3 *db = pParse->db;
  Vdbe *v;
  int iDb;         /* Database number to create the table in */
  Token *pName;    /* Unqualified name of the table to create */

  /* The table or view name to create is passed to this routine via tokens
  ** pName1 and pName2. If the table name was fully qualified, for example:
  **

  ** CREATE TABLE xxx.yyy (...);
  ** 

  ** Then pName1 is set to "xxx" and pName2 "yyy". On the other hand if
  ** the table name is not fully qualified, i.e.:
  **
  ** CREATE TABLE yyy(...);
  **
  ** Then pName1 is set to "yyy" and pName2 is "".
  **
  ** The call below sets the pName pointer to point at the token (pName1 or
  ** pName2) that stores the unqualified table name. The variable iDb is
  ** set to the index of the database that the table or view is to be
  ** created in.
  */
  iDb = sqlite3TwoPartName(pParse, pName1, pName2, &pName);
  if( iDb<0 ) return;
  if( !OMIT_TEMPDB && isTemp && pName2->n>0 && iDb!=1 ){
    /* If creating a temp table, the name may not be qualified. Unless 
    ** the database name is "temp" anyway.  */
    sqlite3ErrorMsg(pParse, "temporary table name must be unqualified");
    return;
  }
  if( !OMIT_TEMPDB && isTemp ) iDb = 1;


  pParse->sNameToken = *pName;
  zName = sqlite3NameFromToken(db, pName);
  if( zName==0 ) return;
  if( SQLITE_OK!=sqlite3CheckObjectName(pParse, zName) ){
    goto begin_table_error;
  }
  if( db->init.iDb==1 ) isTemp = 1;
#ifndef SQLITE_OMIT_AUTHORIZATION
  assert( (isTemp & 1)==isTemp );


  {
    int code;






    char *zDb = db->aDb[iDb].zName;
    if( sqlite3AuthCheck(pParse, SQLITE_INSERT, SCHEMA_TABLE(isTemp), 0, zDb) ){
      goto begin_table_error;
    }
    if( isView ){
      if( !OMIT_TEMPDB && isTemp ){
        code = SQLITE_CREATE_TEMP_VIEW;
      }else{
        code = SQLITE_CREATE_VIEW;
      }
    }else{
      if( !OMIT_TEMPDB && isTemp ){
        code = SQLITE_CREATE_TEMP_TABLE;
      }else{
        code = SQLITE_CREATE_TABLE;
      }
    }
    if( !isVirtual && sqlite3AuthCheck(pParse, code, zName, 0, zDb) ){

      goto begin_table_error;
    }
  }
#endif

  /* Make sure the new table name does not collide with an existing
  ** index or table name in the same database.  Issue an error message if
................................................................................
  assert( !db->init.busy || !pSelect );

  /* If the db->init.busy is 1 it means we are reading the SQL off the
  ** "sqlite_master" or "sqlite_temp_master" table on the disk.
  ** So do not write to the disk again.  Extract the root page number
  ** for the table from the db->init.newTnum field.  (The page number
  ** should have been put there by the sqliteOpenCb routine.)



  */
  if( db->init.busy ){
    p->tnum = db->init.newTnum;

  }

  /* Special processing for WITHOUT ROWID Tables */
  if( tabOpts & TF_WithoutRowid ){
    if( (p->tabFlags & TF_Autoincrement) ){
      sqlite3ErrorMsg(pParse,
          "AUTOINCREMENT not allowed on WITHOUT ROWID tables");
................................................................................
** Also write code to modify the sqlite_master table and internal schema
** if a root-page of another table is moved by the btree-layer whilst
** erasing iTable (this can happen with an auto-vacuum database).
*/ 
static void destroyRootPage(Parse *pParse, int iTable, int iDb){
  Vdbe *v = sqlite3GetVdbe(pParse);
  int r1 = sqlite3GetTempReg(pParse);

  sqlite3VdbeAddOp3(v, OP_Destroy, iTable, r1, iDb);
  sqlite3MayAbort(pParse);
#ifndef SQLITE_OMIT_AUTOVACUUM
  /* OP_Destroy stores an in integer r1. If this integer
  ** is non-zero, then it is the root page number of a table moved to
  ** location iTable. The following code modifies the sqlite_master table to
  ** reflect this.
................................................................................
  SrcList *pList,     /* Append to this SrcList. NULL creates a new SrcList */
  Token *pTable,      /* Table to append */
  Token *pDatabase    /* Database of the table */
){
  struct SrcList_item *pItem;
  assert( pDatabase==0 || pTable!=0 );  /* Cannot have C without B */
  if( pList==0 ){
    pList = sqlite3DbMallocZero(db, sizeof(SrcList) );
    if( pList==0 ) return 0;
    pList->nAlloc = 1;

  }
  pList = sqlite3SrcListEnlarge(db, pList, 1, pList->nSrc);
  if( db->mallocFailed ){
    sqlite3SrcListDelete(db, pList);
    return 0;
  }
  pItem = &pList->a[pList->nSrc-1];
................................................................................
){
  Vdbe *v = sqlite3GetVdbe(pParse);
  assert( (errCode&0xff)==SQLITE_CONSTRAINT );
  if( onError==OE_Abort ){
    sqlite3MayAbort(pParse);
  }
  sqlite3VdbeAddOp4(v, OP_Halt, errCode, onError, 0, p4, p4type);
  if( p5Errmsg ) sqlite3VdbeChangeP5(v, p5Errmsg);
}

/*
** Code an OP_Halt due to UNIQUE or PRIMARY KEY constraint violation.
*/
void sqlite3UniqueConstraint(
  Parse *pParse,    /* Parsing context */

  if( v && pParse->nErr==0 && !db->mallocFailed ){
    assert( pParse->iCacheLevel==0 );  /* Disables and re-enables match */
    /* A minimum of one cursor is required if autoincrement is used
    *  See ticket [a696379c1f08866] */
    if( pParse->pAinc!=0 && pParse->nTab==0 ) pParse->nTab = 1;
    sqlite3VdbeMakeReady(v, pParse);
    pParse->rc = SQLITE_DONE;

  }else{
    pParse->rc = SQLITE_ERROR;
  }

  /* We are done with this Parse object. There is no need to de-initialize it */
#if 0
  pParse->colNamesSet = 0;
  pParse->nTab = 0;
  pParse->nMem = 0;
  pParse->nSet = 0;
  pParse->nVar = 0;
  DbMaskZero(pParse->cookieMask);
#endif
}

/*
** Run the parser and code generator recursively in order to generate
** code for the SQL statement given onto the end of the pParse context
** currently under construction.  When the parser is run recursively
** this way, the final OP_Halt is not appended and other initialization
................................................................................
      continue;
    }
    if( j<i ){
      db->aDb[j] = db->aDb[i];
    }
    j++;
  }

  db->nDb = j;
  if( db->nDb<=2 && db->aDb!=db->aDbStatic ){
    memcpy(db->aDbStatic, db->aDb, 2*sizeof(db->aDb[0]));
    sqlite3DbFree(db, db->aDb);
    db->aDb = db->aDbStatic;
  }
}
................................................................................
  Token *pName1,      /* The "xxx" in the name "xxx.yyy" or "xxx" */
  Token *pName2,      /* The "yyy" in the name "xxx.yyy" */
  Token **pUnqual     /* Write the unqualified object name here */
){
  int iDb;                    /* Database holding the object */
  sqlite3 *db = pParse->db;

  assert( pName2!=0 );
  if( pName2->n>0 ){
    if( db->init.busy ) {
      sqlite3ErrorMsg(pParse, "corrupt database");
      return -1;
    }
    *pUnqual = pName2;
    iDb = sqlite3FindDb(db, pName1);
    if( iDb<0 ){
................................................................................
  Table *pTable;
  char *zName = 0; /* The name of the new table */
  sqlite3 *db = pParse->db;
  Vdbe *v;
  int iDb;         /* Database number to create the table in */
  Token *pName;    /* Unqualified name of the table to create */

  if( db->init.busy && db->init.newTnum==1 ){
    /* Special case:  Parsing the sqlite_master or sqlite_temp_master schema */

    iDb = db->init.iDb;
    zName = sqlite3DbStrDup(db, SCHEMA_TABLE(iDb));

    pName = pName1;
  }else{
    /* The common case */










    iDb = sqlite3TwoPartName(pParse, pName1, pName2, &pName);
    if( iDb<0 ) return;
    if( !OMIT_TEMPDB && isTemp && pName2->n>0 && iDb!=1 ){
      /* If creating a temp table, the name may not be qualified. Unless 
      ** the database name is "temp" anyway.  */
      sqlite3ErrorMsg(pParse, "temporary table name must be unqualified");
      return;
    }
    if( !OMIT_TEMPDB && isTemp ) iDb = 1;
    zName = sqlite3NameFromToken(db, pName);
  }
  pParse->sNameToken = *pName;

  if( zName==0 ) return;
  if( SQLITE_OK!=sqlite3CheckObjectName(pParse, zName) ){
    goto begin_table_error;
  }
  if( db->init.iDb==1 ) isTemp = 1;
#ifndef SQLITE_OMIT_AUTHORIZATION

  assert( isTemp==0 || isTemp==1 );
  assert( isView==0 || isView==1 );
  {

    static const u8 aCode[] = {
       SQLITE_CREATE_TABLE,
       SQLITE_CREATE_TEMP_TABLE,
       SQLITE_CREATE_VIEW,
       SQLITE_CREATE_TEMP_VIEW
    };
    char *zDb = db->aDb[iDb].zName;
    if( sqlite3AuthCheck(pParse, SQLITE_INSERT, SCHEMA_TABLE(isTemp), 0, zDb) ){
      goto begin_table_error;
    }













    if( !isVirtual && sqlite3AuthCheck(pParse, (int)aCode[isTemp+2*isView],
                                       zName, 0, zDb) ){
      goto begin_table_error;
    }
  }
#endif

  /* Make sure the new table name does not collide with an existing
  ** index or table name in the same database.  Issue an error message if
................................................................................
  assert( !db->init.busy || !pSelect );

  /* If the db->init.busy is 1 it means we are reading the SQL off the
  ** "sqlite_master" or "sqlite_temp_master" table on the disk.
  ** So do not write to the disk again.  Extract the root page number
  ** for the table from the db->init.newTnum field.  (The page number
  ** should have been put there by the sqliteOpenCb routine.)
  **
  ** If the root page number is 1, that means this is the sqlite_master
  ** table itself.  So mark it read-only.
  */
  if( db->init.busy ){
    p->tnum = db->init.newTnum;
    if( p->tnum==1 ) p->tabFlags |= TF_Readonly;
  }

  /* Special processing for WITHOUT ROWID Tables */
  if( tabOpts & TF_WithoutRowid ){
    if( (p->tabFlags & TF_Autoincrement) ){
      sqlite3ErrorMsg(pParse,
          "AUTOINCREMENT not allowed on WITHOUT ROWID tables");
................................................................................
** Also write code to modify the sqlite_master table and internal schema
** if a root-page of another table is moved by the btree-layer whilst
** erasing iTable (this can happen with an auto-vacuum database).
*/ 
static void destroyRootPage(Parse *pParse, int iTable, int iDb){
  Vdbe *v = sqlite3GetVdbe(pParse);
  int r1 = sqlite3GetTempReg(pParse);
  assert( iTable>1 );
  sqlite3VdbeAddOp3(v, OP_Destroy, iTable, r1, iDb);
  sqlite3MayAbort(pParse);
#ifndef SQLITE_OMIT_AUTOVACUUM
  /* OP_Destroy stores an in integer r1. If this integer
  ** is non-zero, then it is the root page number of a table moved to
  ** location iTable. The following code modifies the sqlite_master table to
  ** reflect this.
................................................................................
  SrcList *pList,     /* Append to this SrcList. NULL creates a new SrcList */
  Token *pTable,      /* Table to append */
  Token *pDatabase    /* Database of the table */
){
  struct SrcList_item *pItem;
  assert( pDatabase==0 || pTable!=0 );  /* Cannot have C without B */
  if( pList==0 ){
    pList = sqlite3DbMallocRaw(db, sizeof(SrcList) );
    if( pList==0 ) return 0;
    pList->nAlloc = 1;
    pList->nSrc = 0;
  }
  pList = sqlite3SrcListEnlarge(db, pList, 1, pList->nSrc);
  if( db->mallocFailed ){
    sqlite3SrcListDelete(db, pList);
    return 0;
  }
  pItem = &pList->a[pList->nSrc-1];
................................................................................
){
  Vdbe *v = sqlite3GetVdbe(pParse);
  assert( (errCode&0xff)==SQLITE_CONSTRAINT );
  if( onError==OE_Abort ){
    sqlite3MayAbort(pParse);
  }
  sqlite3VdbeAddOp4(v, OP_Halt, errCode, onError, 0, p4, p4type);
  sqlite3VdbeChangeP5(v, p5Errmsg);
}

/*
** Code an OP_Halt due to UNIQUE or PRIMARY KEY constraint violation.
*/
void sqlite3UniqueConstraint(
  Parse *pParse,    /* Parsing context */

** 1: UTF8/16 conversion required and function takes any number of arguments.
** 2: UTF16 byte order change required and function takes any number of args.
** 3: encoding matches and function takes any number of arguments
** 4: UTF8/16 conversion required - argument count matches exactly
** 5: UTF16 byte order conversion required - argument count matches exactly
** 6: Perfect match:  encoding and argument count match exactly.
**
** If nArg==(-2) then any function with a non-null xStep or xFunc is
** a perfect match and any function with both xStep and xFunc NULL is
** a non-match.
*/
#define FUNC_PERFECT_MATCH 6  /* The score for a perfect match */
static int matchQuality(
  FuncDef *p,     /* The function we are evaluating for match quality */
  int nArg,       /* Desired number of arguments.  (-1)==any */
  u8 enc          /* Desired text encoding */
){
  int match;

  /* nArg of -2 is a special case */
  if( nArg==(-2) ) return (p->xFunc==0 && p->xStep==0) ? 0 : FUNC_PERFECT_MATCH;

  /* Wrong number of arguments means "no match" */
  if( p->nArg!=nArg && p->nArg>=0 ) return 0;

  /* Give a better score to a function with a specific number of arguments
  ** than to function that accepts any number of arguments. */
  if( p->nArg==nArg ){
................................................................................
** NULL if the function does not exist.
**
** If the createFlag argument is true, then a new (blank) FuncDef
** structure is created and liked into the "db" structure if a
** no matching function previously existed.
**
** If nArg is -2, then the first valid function found is returned.  A
** function is valid if either xFunc or xStep is non-zero.  The nArg==(-2)
** case is used to see if zName is a valid function name for some number
** of arguments.  If nArg is -2, then createFlag must be 0.
**
** If createFlag is false, then a function with the required name and
** number of arguments may be returned even if the eTextRep flag does not
** match that requested.
*/
................................................................................
    pBest->nArg = (u16)nArg;
    pBest->funcFlags = enc;
    memcpy(pBest->zName, zName, nName);
    pBest->zName[nName] = 0;
    sqlite3FuncDefInsert(&db->aFunc, pBest);
  }

  if( pBest && (pBest->xStep || pBest->xFunc || createFlag) ){
    return pBest;
  }
  return 0;
}

/*
** Free all resources held by the schema structure. The void* argument points

** 1: UTF8/16 conversion required and function takes any number of arguments.
** 2: UTF16 byte order change required and function takes any number of args.
** 3: encoding matches and function takes any number of arguments
** 4: UTF8/16 conversion required - argument count matches exactly
** 5: UTF16 byte order conversion required - argument count matches exactly
** 6: Perfect match:  encoding and argument count match exactly.
**
** If nArg==(-2) then any function with a non-null xSFunc is
** a perfect match and any function with xSFunc NULL is
** a non-match.
*/
#define FUNC_PERFECT_MATCH 6  /* The score for a perfect match */
static int matchQuality(
  FuncDef *p,     /* The function we are evaluating for match quality */
  int nArg,       /* Desired number of arguments.  (-1)==any */
  u8 enc          /* Desired text encoding */
){
  int match;

  /* nArg of -2 is a special case */
  if( nArg==(-2) ) return (p->xSFunc==0) ? 0 : FUNC_PERFECT_MATCH;

  /* Wrong number of arguments means "no match" */
  if( p->nArg!=nArg && p->nArg>=0 ) return 0;

  /* Give a better score to a function with a specific number of arguments
  ** than to function that accepts any number of arguments. */
  if( p->nArg==nArg ){
................................................................................
** NULL if the function does not exist.
**
** If the createFlag argument is true, then a new (blank) FuncDef
** structure is created and liked into the "db" structure if a
** no matching function previously existed.
**
** If nArg is -2, then the first valid function found is returned.  A
** function is valid if xSFunc is non-zero.  The nArg==(-2)
** case is used to see if zName is a valid function name for some number
** of arguments.  If nArg is -2, then createFlag must be 0.
**
** If createFlag is false, then a function with the required name and
** number of arguments may be returned even if the eTextRep flag does not
** match that requested.
*/
................................................................................
    pBest->nArg = (u16)nArg;
    pBest->funcFlags = enc;
    memcpy(pBest->zName, zName, nName);
    pBest->zName[nName] = 0;
    sqlite3FuncDefInsert(&db->aFunc, pBest);
  }

  if( pBest && (pBest->xSFunc || createFlag) ){
    return pBest;
  }
  return 0;
}

/*
** Free all resources held by the schema structure. The void* argument points

  char validJD;      /* True (1) if iJD is valid */
  char validTZ;      /* True (1) if tz is valid */
  char tzSet;        /* Timezone was set explicitly */
};


/*
** Convert zDate into one or more integers.  Additional arguments
** come in groups of 5 as follows:
**
**       N       number of digits in the integer
**       min     minimum allowed value of the integer
**       max     maximum allowed value of the integer
**       nextC   first character after the integer
**       pVal    where to write the integers value.










**
** Conversions continue until one with nextC==0 is encountered.





** The function returns the number of successful conversions.
*/
static int getDigits(const char *zDate, ...){



  va_list ap;
  int val;
  int N;
  int min;
  int max;
  int nextC;
  int *pVal;
  int cnt = 0;
  va_start(ap, zDate);
  do{
    N = va_arg(ap, int);
    min = va_arg(ap, int);
    max = va_arg(ap, int);







    nextC = va_arg(ap, int);
    pVal = va_arg(ap, int*);
    val = 0;
    while( N-- ){
      if( !sqlite3Isdigit(*zDate) ){
        goto end_getDigits;
      }
      val = val*10 + *zDate - '0';
      zDate++;
    }
    if( val<min || val>max || (nextC!=0 && nextC!=*zDate) ){
      goto end_getDigits;
    }
    *pVal = val;
    zDate++;
    cnt++;

  }while( nextC );
end_getDigits:
  va_end(ap);
  return cnt;
}

/*
................................................................................
  }else if( c=='Z' || c=='z' ){
    zDate++;
    goto zulu_time;
  }else{
    return c!=0;
  }
  zDate++;
  if( getDigits(zDate, 2, 0, 14, ':', &nHr, 2, 0, 59, 0, &nMn)!=2 ){
    return 1;
  }
  zDate += 5;
  p->tz = sgn*(nMn + nHr*60);
zulu_time:
  while( sqlite3Isspace(*zDate) ){ zDate++; }
  p->tzSet = 1;
................................................................................
** fractional seconds FFFF can be one or more digits.
**
** Return 1 if there is a parsing error and 0 on success.
*/
static int parseHhMmSs(const char *zDate, DateTime *p){
  int h, m, s;
  double ms = 0.0;
  if( getDigits(zDate, 2, 0, 24, ':', &h, 2, 0, 59, 0, &m)!=2 ){
    return 1;
  }
  zDate += 5;
  if( *zDate==':' ){
    zDate++;
    if( getDigits(zDate, 2, 0, 59, 0, &s)!=1 ){
      return 1;
    }
    zDate += 2;
    if( *zDate=='.' && sqlite3Isdigit(zDate[1]) ){
      double rScale = 1.0;
      zDate++;
      while( sqlite3Isdigit(*zDate) ){
................................................................................

  if( zDate[0]=='-' ){
    zDate++;
    neg = 1;
  }else{
    neg = 0;
  }
  if( getDigits(zDate,4,0,9999,'-',&Y,2,1,12,'-',&M,2,1,31,0,&D)!=3 ){
    return 1;
  }
  zDate += 10;
  while( sqlite3Isspace(*zDate) || 'T'==*(u8*)zDate ){ zDate++; }
  if( parseHhMmSs(zDate, p)==0 ){
    /* We got the time */
  }else if( *zDate==0 ){

  char validJD;      /* True (1) if iJD is valid */
  char validTZ;      /* True (1) if tz is valid */
  char tzSet;        /* Timezone was set explicitly */
};


/*
** Convert zDate into one or more integers according to the conversion
** specifier zFormat.
**
** zFormat[] contains 4 characters for each integer converted, except for
** the last integer which is specified by three characters.  The meaning
** of a four-character format specifiers ABCD is:
**
**    A:   number of digits to convert.  Always "2" or "4".
**    B:   minimum value.  Always "0" or "1".
**    C:   maximum value, decoded as:
**           a:  12
**           b:  14
**           c:  24
**           d:  31
**           e:  59
**           f:  9999
**    D:   the separator character, or \000 to indicate this is the
**         last number to convert.
**

** Example:  To translate an ISO-8601 date YYYY-MM-DD, the format would
** be "40f-21a-20c".  The "40f-" indicates the 4-digit year followed by "-".
** The "21a-" indicates the 2-digit month followed by "-".  The "20c" indicates
** the 2-digit day which is the last integer in the set.
**
** The function returns the number of successful conversions.
*/
static int getDigits(const char *zDate, const char *zFormat, ...){
  /* The aMx[] array translates the 3rd character of each format
  ** spec into a max size:    a   b   c   d   e     f */
  static const u16 aMx[] = { 12, 14, 24, 31, 59, 9999 };
  va_list ap;

  int cnt = 0;


  char nextC;


  va_start(ap, zFormat);
  do{



    char N = zFormat[0] - '0';
    char min = zFormat[1] - '0';
    int val = 0;
    u16 max;

    assert( zFormat[2]>='a' && zFormat[2]<='f' );
    max = aMx[zFormat[2] - 'a'];
    nextC = zFormat[3];

    val = 0;
    while( N-- ){
      if( !sqlite3Isdigit(*zDate) ){
        goto end_getDigits;
      }
      val = val*10 + *zDate - '0';
      zDate++;
    }
    if( val<(int)min || val>(int)max || (nextC!=0 && nextC!=*zDate) ){
      goto end_getDigits;
    }
    *va_arg(ap,int*) = val;
    zDate++;
    cnt++;
    zFormat += 4;
  }while( nextC );
end_getDigits:
  va_end(ap);
  return cnt;
}

/*
................................................................................
  }else if( c=='Z' || c=='z' ){
    zDate++;
    goto zulu_time;
  }else{
    return c!=0;
  }
  zDate++;
  if( getDigits(zDate, "20b:20e", &nHr, &nMn)!=2 ){
    return 1;
  }
  zDate += 5;
  p->tz = sgn*(nMn + nHr*60);
zulu_time:
  while( sqlite3Isspace(*zDate) ){ zDate++; }
  p->tzSet = 1;
................................................................................
** fractional seconds FFFF can be one or more digits.
**
** Return 1 if there is a parsing error and 0 on success.
*/
static int parseHhMmSs(const char *zDate, DateTime *p){
  int h, m, s;
  double ms = 0.0;
  if( getDigits(zDate, "20c:20e", &h, &m)!=2 ){
    return 1;
  }
  zDate += 5;
  if( *zDate==':' ){
    zDate++;
    if( getDigits(zDate, "20e", &s)!=1 ){
      return 1;
    }
    zDate += 2;
    if( *zDate=='.' && sqlite3Isdigit(zDate[1]) ){
      double rScale = 1.0;
      zDate++;
      while( sqlite3Isdigit(*zDate) ){
................................................................................

  if( zDate[0]=='-' ){
    zDate++;
    neg = 1;
  }else{
    neg = 0;
  }
  if( getDigits(zDate, "40f-21a-21d", &Y, &M, &D)!=3 ){
    return 1;
  }
  zDate += 10;
  while( sqlite3Isspace(*zDate) || 'T'==*(u8*)zDate ){ zDate++; }
  if( parseHhMmSs(zDate, p)==0 ){
    /* We got the time */
  }else if( *zDate==0 ){

ExprList *sqlite3ExprListAppend(
  Parse *pParse,          /* Parsing context */
  ExprList *pList,        /* List to which to append. Might be NULL */
  Expr *pExpr             /* Expression to be appended. Might be NULL */
){
  sqlite3 *db = pParse->db;
  if( pList==0 ){
    pList = sqlite3DbMallocZero(db, sizeof(ExprList) );
    if( pList==0 ){
      goto no_mem;
    }

    pList->a = sqlite3DbMallocRaw(db, sizeof(pList->a[0]));
    if( pList->a==0 ) goto no_mem;
  }else if( (pList->nExpr & (pList->nExpr-1))==0 ){
    struct ExprList_item *a;
    assert( pList->nExpr>0 );
    a = sqlite3DbRealloc(db, pList->a, pList->nExpr*2*sizeof(pList->a[0]));
    if( a==0 ){
................................................................................
        pFarg = pExpr->x.pList;
      }
      nFarg = pFarg ? pFarg->nExpr : 0;
      assert( !ExprHasProperty(pExpr, EP_IntValue) );
      zId = pExpr->u.zToken;
      nId = sqlite3Strlen30(zId);
      pDef = sqlite3FindFunction(db, zId, nId, nFarg, enc, 0);
      if( pDef==0 || pDef->xFunc==0 ){
        sqlite3ErrorMsg(pParse, "unknown function: %.*s()", nId, zId);
        break;
      }

      /* Attempt a direct implementation of the built-in COALESCE() and
      ** IFNULL() functions.  This avoids unnecessary evaluation of
      ** arguments past the first non-NULL argument.

ExprList *sqlite3ExprListAppend(
  Parse *pParse,          /* Parsing context */
  ExprList *pList,        /* List to which to append. Might be NULL */
  Expr *pExpr             /* Expression to be appended. Might be NULL */
){
  sqlite3 *db = pParse->db;
  if( pList==0 ){
    pList = sqlite3DbMallocRaw(db, sizeof(ExprList) );
    if( pList==0 ){
      goto no_mem;
    }
    pList->nExpr = 0;
    pList->a = sqlite3DbMallocRaw(db, sizeof(pList->a[0]));
    if( pList->a==0 ) goto no_mem;
  }else if( (pList->nExpr & (pList->nExpr-1))==0 ){
    struct ExprList_item *a;
    assert( pList->nExpr>0 );
    a = sqlite3DbRealloc(db, pList->a, pList->nExpr*2*sizeof(pList->a[0]));
    if( a==0 ){
................................................................................
        pFarg = pExpr->x.pList;
      }
      nFarg = pFarg ? pFarg->nExpr : 0;
      assert( !ExprHasProperty(pExpr, EP_IntValue) );
      zId = pExpr->u.zToken;
      nId = sqlite3Strlen30(zId);
      pDef = sqlite3FindFunction(db, zId, nId, nFarg, enc, 0);
      if( pDef==0 || pDef->xFinalize!=0 ){
        sqlite3ErrorMsg(pParse, "unknown function: %.*s()", nId, zId);
        break;
      }

      /* Attempt a direct implementation of the built-in COALESCE() and
      ** IFNULL() functions.  This avoids unnecessary evaluation of
      ** arguments past the first non-NULL argument.

    sqlite3VdbeAddOp2(v, OP_IdxInsert, iIdxCur+i, aRegIdx[i]);
    pik_flags = 0;
    if( useSeekResult ) pik_flags = OPFLAG_USESEEKRESULT;
    if( IsPrimaryKeyIndex(pIdx) && !HasRowid(pTab) ){
      assert( pParse->nested==0 );
      pik_flags |= OPFLAG_NCHANGE;
    }
    if( pik_flags )  sqlite3VdbeChangeP5(v, pik_flags);
  }
  if( !HasRowid(pTab) ) return;
  regData = regNewData + 1;
  regRec = sqlite3GetTempReg(pParse);
  sqlite3VdbeAddOp3(v, OP_MakeRecord, regData, pTab->nCol, regRec);
  if( !bAffinityDone ) sqlite3TableAffinity(v, pTab, 0);
  sqlite3ExprCacheAffinityChange(pParse, regData, pTab->nCol);
................................................................................
    }else if( pDest->pIndex==0 ){
      addr1 = sqlite3VdbeAddOp2(v, OP_NewRowid, iDest, regRowid);
    }else{
      addr1 = sqlite3VdbeAddOp2(v, OP_Rowid, iSrc, regRowid);
      assert( (pDest->tabFlags & TF_Autoincrement)==0 );
    }
    sqlite3VdbeAddOp2(v, OP_RowData, iSrc, regData);
    sqlite3VdbeAddOp3(v, OP_Insert, iDest, regData, regRowid);

    sqlite3VdbeChangeP5(v, OPFLAG_NCHANGE|OPFLAG_LASTROWID|OPFLAG_APPEND);
    sqlite3VdbeChangeP4(v, -1, pDest->zName, 0);
    sqlite3VdbeAddOp2(v, OP_Next, iSrc, addr1); VdbeCoverage(v);
    sqlite3VdbeAddOp2(v, OP_Close, iSrc, 0);
    sqlite3VdbeAddOp2(v, OP_Close, iDest, 0);
  }else{
    sqlite3TableLock(pParse, iDbDest, pDest->tnum, 1, pDest->zName);
    sqlite3TableLock(pParse, iDbSrc, pSrc->tnum, 0, pSrc->zName);
  }

    sqlite3VdbeAddOp2(v, OP_IdxInsert, iIdxCur+i, aRegIdx[i]);
    pik_flags = 0;
    if( useSeekResult ) pik_flags = OPFLAG_USESEEKRESULT;
    if( IsPrimaryKeyIndex(pIdx) && !HasRowid(pTab) ){
      assert( pParse->nested==0 );
      pik_flags |= OPFLAG_NCHANGE;
    }
    sqlite3VdbeChangeP5(v, pik_flags);
  }
  if( !HasRowid(pTab) ) return;
  regData = regNewData + 1;
  regRec = sqlite3GetTempReg(pParse);
  sqlite3VdbeAddOp3(v, OP_MakeRecord, regData, pTab->nCol, regRec);
  if( !bAffinityDone ) sqlite3TableAffinity(v, pTab, 0);
  sqlite3ExprCacheAffinityChange(pParse, regData, pTab->nCol);
................................................................................
    }else if( pDest->pIndex==0 ){
      addr1 = sqlite3VdbeAddOp2(v, OP_NewRowid, iDest, regRowid);
    }else{
      addr1 = sqlite3VdbeAddOp2(v, OP_Rowid, iSrc, regRowid);
      assert( (pDest->tabFlags & TF_Autoincrement)==0 );
    }
    sqlite3VdbeAddOp2(v, OP_RowData, iSrc, regData);
    sqlite3VdbeAddOp4(v, OP_Insert, iDest, regData, regRowid,
                      pDest->zName, 0);
    sqlite3VdbeChangeP5(v, OPFLAG_NCHANGE|OPFLAG_LASTROWID|OPFLAG_APPEND);

    sqlite3VdbeAddOp2(v, OP_Next, iSrc, addr1); VdbeCoverage(v);
    sqlite3VdbeAddOp2(v, OP_Close, iSrc, 0);
    sqlite3VdbeAddOp2(v, OP_Close, iDest, 0);
  }else{
    sqlite3TableLock(pParse, iDbDest, pDest->tnum, 1, pDest->zName);
    sqlite3TableLock(pParse, iDbSrc, pSrc->tnum, 0, pSrc->zName);
  }

*/
int sqlite3CreateFunc(
  sqlite3 *db,
  const char *zFunctionName,
  int nArg,
  int enc,
  void *pUserData,
  void (*xFunc)(sqlite3_context*,int,sqlite3_value **),
  void (*xStep)(sqlite3_context*,int,sqlite3_value **),
  void (*xFinal)(sqlite3_context*),
  FuncDestructor *pDestructor
){
  FuncDef *p;
  int nName;
  int extraFlags;

  assert( sqlite3_mutex_held(db->mutex) );
  if( zFunctionName==0 ||
      (xFunc && (xFinal || xStep)) || 
      (!xFunc && (xFinal && !xStep)) ||
      (!xFunc && (!xFinal && xStep)) ||
      (nArg<-1 || nArg>SQLITE_MAX_FUNCTION_ARG) ||
      (255<(nName = sqlite3Strlen30( zFunctionName))) ){
    return SQLITE_MISUSE_BKPT;
  }

  assert( SQLITE_FUNC_CONSTANT==SQLITE_DETERMINISTIC );
  extraFlags = enc &  SQLITE_DETERMINISTIC;
................................................................................
  ** to the hash table.
  */
  if( enc==SQLITE_UTF16 ){
    enc = SQLITE_UTF16NATIVE;
  }else if( enc==SQLITE_ANY ){
    int rc;
    rc = sqlite3CreateFunc(db, zFunctionName, nArg, SQLITE_UTF8|extraFlags,
         pUserData, xFunc, xStep, xFinal, pDestructor);
    if( rc==SQLITE_OK ){
      rc = sqlite3CreateFunc(db, zFunctionName, nArg, SQLITE_UTF16LE|extraFlags,
          pUserData, xFunc, xStep, xFinal, pDestructor);
    }
    if( rc!=SQLITE_OK ){
      return rc;
    }
    enc = SQLITE_UTF16BE;
  }
#else
................................................................................

  if( pDestructor ){
    pDestructor->nRef++;
  }
  p->pDestructor = pDestructor;
  p->funcFlags = (p->funcFlags & SQLITE_FUNC_ENCMASK) | extraFlags;
  testcase( p->funcFlags & SQLITE_DETERMINISTIC );
  p->xFunc = xFunc;
  p->xStep = xStep;
  p->xFinalize = xFinal;
  p->pUserData = pUserData;
  p->nArg = (u16)nArg;
  return SQLITE_OK;
}

/*
................................................................................
*/
int sqlite3_create_function(
  sqlite3 *db,
  const char *zFunc,
  int nArg,
  int enc,
  void *p,
  void (*xFunc)(sqlite3_context*,int,sqlite3_value **),
  void (*xStep)(sqlite3_context*,int,sqlite3_value **),
  void (*xFinal)(sqlite3_context*)
){
  return sqlite3_create_function_v2(db, zFunc, nArg, enc, p, xFunc, xStep,
                                    xFinal, 0);
}

int sqlite3_create_function_v2(
  sqlite3 *db,
  const char *zFunc,
  int nArg,
  int enc,
  void *p,
  void (*xFunc)(sqlite3_context*,int,sqlite3_value **),
  void (*xStep)(sqlite3_context*,int,sqlite3_value **),
  void (*xFinal)(sqlite3_context*),
  void (*xDestroy)(void *)
){
  int rc = SQLITE_ERROR;
  FuncDestructor *pArg = 0;

................................................................................
    if( !pArg ){
      xDestroy(p);
      goto out;
    }
    pArg->xDestroy = xDestroy;
    pArg->pUserData = p;
  }
  rc = sqlite3CreateFunc(db, zFunc, nArg, enc, p, xFunc, xStep, xFinal, pArg);
  if( pArg && pArg->nRef==0 ){
    assert( rc!=SQLITE_OK );
    xDestroy(p);
    sqlite3DbFree(db, pArg);
  }

 out:
................................................................................
#ifndef SQLITE_OMIT_UTF16
int sqlite3_create_function16(
  sqlite3 *db,
  const void *zFunctionName,
  int nArg,
  int eTextRep,
  void *p,
  void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
  void (*xStep)(sqlite3_context*,int,sqlite3_value**),
  void (*xFinal)(sqlite3_context*)
){
  int rc;
  char *zFunc8;

#ifdef SQLITE_ENABLE_API_ARMOR
  if( !sqlite3SafetyCheckOk(db) || zFunctionName==0 ) return SQLITE_MISUSE_BKPT;
#endif
  sqlite3_mutex_enter(db->mutex);
  assert( !db->mallocFailed );
  zFunc8 = sqlite3Utf16to8(db, zFunctionName, -1, SQLITE_UTF16NATIVE);
  rc = sqlite3CreateFunc(db, zFunc8, nArg, eTextRep, p, xFunc, xStep, xFinal,0);
  sqlite3DbFree(db, zFunc8);
  rc = sqlite3ApiExit(db, rc);
  sqlite3_mutex_leave(db->mutex);
  return rc;
}
#endif

................................................................................
  /* Enable the lookaside-malloc subsystem */
  setupLookaside(db, 0, sqlite3GlobalConfig.szLookaside,
                        sqlite3GlobalConfig.nLookaside);

  sqlite3_wal_autocheckpoint(db, SQLITE_DEFAULT_WAL_AUTOCHECKPOINT);

opendb_out:
  sqlite3_free(zOpen);
  if( db ){
    assert( db->mutex!=0 || isThreadsafe==0
           || sqlite3GlobalConfig.bFullMutex==0 );
    sqlite3_mutex_leave(db->mutex);
  }
  rc = sqlite3_errcode(db);
  assert( db!=0 || rc==SQLITE_NOMEM );
................................................................................
        iByte = (iByte<<4) + sqlite3HexToInt(zHexKey[i]);
        if( (i&1)!=0 ) zKey[i/2] = iByte;
      }
      sqlite3_key_v2(db, 0, zKey, i/2);
    }
  }
#endif

  return rc & 0xff;
}

/*
** Open a new database handle.
*/
int sqlite3_open(

*/
int sqlite3CreateFunc(
  sqlite3 *db,
  const char *zFunctionName,
  int nArg,
  int enc,
  void *pUserData,
  void (*xSFunc)(sqlite3_context*,int,sqlite3_value **),
  void (*xStep)(sqlite3_context*,int,sqlite3_value **),
  void (*xFinal)(sqlite3_context*),
  FuncDestructor *pDestructor
){
  FuncDef *p;
  int nName;
  int extraFlags;

  assert( sqlite3_mutex_held(db->mutex) );
  if( zFunctionName==0 ||
      (xSFunc && (xFinal || xStep)) || 
      (!xSFunc && (xFinal && !xStep)) ||
      (!xSFunc && (!xFinal && xStep)) ||
      (nArg<-1 || nArg>SQLITE_MAX_FUNCTION_ARG) ||
      (255<(nName = sqlite3Strlen30( zFunctionName))) ){
    return SQLITE_MISUSE_BKPT;
  }

  assert( SQLITE_FUNC_CONSTANT==SQLITE_DETERMINISTIC );
  extraFlags = enc &  SQLITE_DETERMINISTIC;
................................................................................
  ** to the hash table.
  */
  if( enc==SQLITE_UTF16 ){
    enc = SQLITE_UTF16NATIVE;
  }else if( enc==SQLITE_ANY ){
    int rc;
    rc = sqlite3CreateFunc(db, zFunctionName, nArg, SQLITE_UTF8|extraFlags,
         pUserData, xSFunc, xStep, xFinal, pDestructor);
    if( rc==SQLITE_OK ){
      rc = sqlite3CreateFunc(db, zFunctionName, nArg, SQLITE_UTF16LE|extraFlags,
          pUserData, xSFunc, xStep, xFinal, pDestructor);
    }
    if( rc!=SQLITE_OK ){
      return rc;
    }
    enc = SQLITE_UTF16BE;
  }
#else
................................................................................

  if( pDestructor ){
    pDestructor->nRef++;
  }
  p->pDestructor = pDestructor;
  p->funcFlags = (p->funcFlags & SQLITE_FUNC_ENCMASK) | extraFlags;
  testcase( p->funcFlags & SQLITE_DETERMINISTIC );
  p->xSFunc = xSFunc ? xSFunc : xStep;

  p->xFinalize = xFinal;
  p->pUserData = pUserData;
  p->nArg = (u16)nArg;
  return SQLITE_OK;
}

/*
................................................................................
*/
int sqlite3_create_function(
  sqlite3 *db,
  const char *zFunc,
  int nArg,
  int enc,
  void *p,
  void (*xSFunc)(sqlite3_context*,int,sqlite3_value **),
  void (*xStep)(sqlite3_context*,int,sqlite3_value **),
  void (*xFinal)(sqlite3_context*)
){
  return sqlite3_create_function_v2(db, zFunc, nArg, enc, p, xSFunc, xStep,
                                    xFinal, 0);
}

int sqlite3_create_function_v2(
  sqlite3 *db,
  const char *zFunc,
  int nArg,
  int enc,
  void *p,
  void (*xSFunc)(sqlite3_context*,int,sqlite3_value **),
  void (*xStep)(sqlite3_context*,int,sqlite3_value **),
  void (*xFinal)(sqlite3_context*),
  void (*xDestroy)(void *)
){
  int rc = SQLITE_ERROR;
  FuncDestructor *pArg = 0;

................................................................................
    if( !pArg ){
      xDestroy(p);
      goto out;
    }
    pArg->xDestroy = xDestroy;
    pArg->pUserData = p;
  }
  rc = sqlite3CreateFunc(db, zFunc, nArg, enc, p, xSFunc, xStep, xFinal, pArg);
  if( pArg && pArg->nRef==0 ){
    assert( rc!=SQLITE_OK );
    xDestroy(p);
    sqlite3DbFree(db, pArg);
  }

 out:
................................................................................
#ifndef SQLITE_OMIT_UTF16
int sqlite3_create_function16(
  sqlite3 *db,
  const void *zFunctionName,
  int nArg,
  int eTextRep,
  void *p,
  void (*xSFunc)(sqlite3_context*,int,sqlite3_value**),
  void (*xStep)(sqlite3_context*,int,sqlite3_value**),
  void (*xFinal)(sqlite3_context*)
){
  int rc;
  char *zFunc8;

#ifdef SQLITE_ENABLE_API_ARMOR
  if( !sqlite3SafetyCheckOk(db) || zFunctionName==0 ) return SQLITE_MISUSE_BKPT;
#endif
  sqlite3_mutex_enter(db->mutex);
  assert( !db->mallocFailed );
  zFunc8 = sqlite3Utf16to8(db, zFunctionName, -1, SQLITE_UTF16NATIVE);
  rc = sqlite3CreateFunc(db, zFunc8, nArg, eTextRep, p, xSFunc,xStep,xFinal,0);
  sqlite3DbFree(db, zFunc8);
  rc = sqlite3ApiExit(db, rc);
  sqlite3_mutex_leave(db->mutex);
  return rc;
}
#endif

................................................................................
  /* Enable the lookaside-malloc subsystem */
  setupLookaside(db, 0, sqlite3GlobalConfig.szLookaside,
                        sqlite3GlobalConfig.nLookaside);

  sqlite3_wal_autocheckpoint(db, SQLITE_DEFAULT_WAL_AUTOCHECKPOINT);

opendb_out:

  if( db ){
    assert( db->mutex!=0 || isThreadsafe==0
           || sqlite3GlobalConfig.bFullMutex==0 );
    sqlite3_mutex_leave(db->mutex);
  }
  rc = sqlite3_errcode(db);
  assert( db!=0 || rc==SQLITE_NOMEM );
................................................................................
        iByte = (iByte<<4) + sqlite3HexToInt(zHexKey[i]);
        if( (i&1)!=0 ) zKey[i/2] = iByte;
      }
      sqlite3_key_v2(db, 0, zKey, i/2);
    }
  }
#endif
  sqlite3_free(zOpen);
  return rc & 0xff;
}

/*
** Open a new database handle.
*/
int sqlite3_open(

  if( p ){
    memset(p, 0, (size_t)n);
  }
  return p;
}

/*

** Allocate and zero memory.  If the allocation fails, make
** the mallocFailed flag in the connection pointer.
**
** If db!=0 and db->mallocFailed is true (indicating a prior malloc
** failure on the same database connection) then always return 0.
** Hence for a particular database connection, once malloc starts
** failing, it fails consistently until mallocFailed is reset.
** This is an important assumption.  There are many places in the
** code that do things like this:
................................................................................
**         int *a = (int*)sqlite3DbMallocRaw(db, 100);
**         int *b = (int*)sqlite3DbMallocRaw(db, 200);
**         if( b ) a[10] = 9;
**
** In other words, if a subsequent malloc (ex: "b") worked, it is assumed
** that all prior mallocs (ex: "a") worked too.
*/

void *sqlite3DbMallocRaw(sqlite3 *db, u64 n){
  void *p;
  assert( db==0 || sqlite3_mutex_held(db->mutex) );
  assert( db==0 || db->pnBytesFreed==0 );
#ifndef SQLITE_OMIT_LOOKASIDE
  if( db ){
    LookasideSlot *pBuf;
    if( db->mallocFailed ){
      return 0;
................................................................................
    }
  }
#else
  if( db && db->mallocFailed ){
    return 0;
  }
#endif



  p = sqlite3Malloc(n);
  if( !p && db ){
    db->mallocFailed = 1;
  }
  sqlite3MemdebugSetType(p, 
         (db && db->lookaside.bEnabled) ? MEMTYPE_LOOKASIDE : MEMTYPE_HEAP);
  return p;
}

  if( p ){
    memset(p, 0, (size_t)n);
  }
  return p;
}

/*
** Allocate memory, either lookaside (if possible) or heap.  
** If the allocation fails, set the mallocFailed flag in
** the connection pointer.
**
** If db!=0 and db->mallocFailed is true (indicating a prior malloc
** failure on the same database connection) then always return 0.
** Hence for a particular database connection, once malloc starts
** failing, it fails consistently until mallocFailed is reset.
** This is an important assumption.  There are many places in the
** code that do things like this:
................................................................................
**         int *a = (int*)sqlite3DbMallocRaw(db, 100);
**         int *b = (int*)sqlite3DbMallocRaw(db, 200);
**         if( b ) a[10] = 9;
**
** In other words, if a subsequent malloc (ex: "b") worked, it is assumed
** that all prior mallocs (ex: "a") worked too.
*/
static SQLITE_NOINLINE void *dbMallocRawFinish(sqlite3 *db, u64 n);
void *sqlite3DbMallocRaw(sqlite3 *db, u64 n){

  assert( db==0 || sqlite3_mutex_held(db->mutex) );
  assert( db==0 || db->pnBytesFreed==0 );
#ifndef SQLITE_OMIT_LOOKASIDE
  if( db ){
    LookasideSlot *pBuf;
    if( db->mallocFailed ){
      return 0;
................................................................................
    }
  }
#else
  if( db && db->mallocFailed ){
    return 0;
  }
#endif
  return dbMallocRawFinish(db, n);
}
static SQLITE_NOINLINE void *dbMallocRawFinish(sqlite3 *db, u64 n){
  void *p = sqlite3Malloc(n);
  if( !p && db ){
    db->mallocFailed = 1;
  }
  sqlite3MemdebugSetType(p, 
         (db && db->lookaside.bEnabled) ? MEMTYPE_LOOKASIDE : MEMTYPE_HEAP);
  return p;
}

      { OP_Integer,     0, 2,        0},
      { OP_Subtract,    1, 2,        1},
      { OP_IfPos,       1, 8,        0},
      { OP_Integer,     0, 1,        0},                         /* 6 */
      { OP_Noop,        0, 0,        0},
      { OP_ResultRow,   1, 1,        0},
    };
    int addr;
    sqlite3VdbeUsesBtree(v, iDb);
    if( !zRight ){
      setOneColumnName(v, "cache_size");
      pParse->nMem += 2;

      addr = sqlite3VdbeAddOpList(v, ArraySize(getCacheSize), getCacheSize,iLn);
      sqlite3VdbeChangeP1(v, addr, iDb);
      sqlite3VdbeChangeP1(v, addr+1, iDb);


      sqlite3VdbeChangeP1(v, addr+6, SQLITE_DEFAULT_CACHE_SIZE);
    }else{
      int size = sqlite3AbsInt32(sqlite3Atoi(zRight));
      sqlite3BeginWriteOperation(pParse, 0, iDb);
      sqlite3VdbeAddOp2(v, OP_Integer, size, 1);
      sqlite3VdbeAddOp3(v, OP_SetCookie, iDb, BTREE_DEFAULT_CACHE_SIZE, 1);
      assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
      pDb->pSchema->cache_size = size;
................................................................................
          { OP_Transaction,    0,         1,                 0},    /* 0 */
          { OP_ReadCookie,     0,         1,         BTREE_LARGEST_ROOT_PAGE},
          { OP_If,             1,         0,                 0},    /* 2 */
          { OP_Halt,           SQLITE_OK, OE_Abort,          0},    /* 3 */
          { OP_Integer,        0,         1,                 0},    /* 4 */
          { OP_SetCookie,      0,         BTREE_INCR_VACUUM, 1},    /* 5 */
        };

        int iAddr;

        iAddr = sqlite3VdbeAddOpList(v, ArraySize(setMeta6), setMeta6, iLn);
        sqlite3VdbeChangeP1(v, iAddr, iDb);
        sqlite3VdbeChangeP1(v, iAddr+1, iDb);
        sqlite3VdbeChangeP2(v, iAddr+2, iAddr+4);
        sqlite3VdbeChangeP1(v, iAddr+4, eAuto-1);
        sqlite3VdbeChangeP1(v, iAddr+5, iDb);



        sqlite3VdbeUsesBtree(v, iDb);
      }
    }
    break;
  }
#endif

................................................................................
  /* Pragma "quick_check" is reduced version of 
  ** integrity_check designed to detect most database corruption
  ** without most of the overhead of a full integrity-check.
  */
  case PragTyp_INTEGRITY_CHECK: {
    int i, j, addr, mxErr;

    /* Code that appears at the end of the integrity check.  If no error
    ** messages have been generated, output OK.  Otherwise output the
    ** error message
    */
    static const int iLn = VDBE_OFFSET_LINENO(2);
    static const VdbeOpList endCode[] = {
      { OP_AddImm,      1, 0,        0},    /* 0 */
      { OP_If,          1, 0,        0},    /* 1 */
      { OP_String8,     0, 3,        0},    /* 2 */
      { OP_ResultRow,   3, 1,        0},
    };

    int isQuick = (sqlite3Tolower(zLeft[0])=='q');

    /* If the PRAGMA command was of the form "PRAGMA <db>.integrity_check",
    ** then iDb is set to the index of the database identified by <db>.
    ** In this case, the integrity of database iDb only is verified by
    ** the VDBE created below.
    **
................................................................................
          sqlite3VdbeLoadString(v, 3, pIdx->zName);
          sqlite3VdbeAddOp3(v, OP_Concat, 3, 2, 7);
          sqlite3VdbeAddOp2(v, OP_ResultRow, 7, 1);
        }
#endif /* SQLITE_OMIT_BTREECOUNT */
      } 
    }










    addr = sqlite3VdbeAddOpList(v, ArraySize(endCode), endCode, iLn);
    sqlite3VdbeChangeP2(v, addr, -mxErr);
    sqlite3VdbeJumpHere(v, addr+1);
    sqlite3VdbeChangeP4(v, addr+2, "ok", P4_STATIC);







  }
  break;
#endif /* SQLITE_OMIT_INTEGRITY_CHECK */

#ifndef SQLITE_OMIT_UTF16
  /*
  **   PRAGMA encoding
................................................................................
    if( zRight && (pPragma->mPragFlag & PragFlag_ReadOnly)==0 ){
      /* Write the specified cookie value */
      static const VdbeOpList setCookie[] = {
        { OP_Transaction,    0,  1,  0},    /* 0 */
        { OP_Integer,        0,  1,  0},    /* 1 */
        { OP_SetCookie,      0,  0,  1},    /* 2 */
      };
      int addr = sqlite3VdbeAddOpList(v, ArraySize(setCookie), setCookie, 0);
      sqlite3VdbeChangeP1(v, addr, iDb);
      sqlite3VdbeChangeP1(v, addr+1, sqlite3Atoi(zRight));
      sqlite3VdbeChangeP1(v, addr+2, iDb);
      sqlite3VdbeChangeP2(v, addr+2, iCookie);



    }else{
      /* Read the specified cookie value */
      static const VdbeOpList readCookie[] = {
        { OP_Transaction,     0,  0,  0},    /* 0 */
        { OP_ReadCookie,      0,  1,  0},    /* 1 */
        { OP_ResultRow,       1,  1,  0}
      };
      int addr = sqlite3VdbeAddOpList(v, ArraySize(readCookie), readCookie, 0);
      sqlite3VdbeChangeP1(v, addr, iDb);
      sqlite3VdbeChangeP1(v, addr+1, iDb);
      sqlite3VdbeChangeP3(v, addr+1, iCookie);



      sqlite3VdbeSetNumCols(v, 1);
      sqlite3VdbeSetColName(v, 0, COLNAME_NAME, zLeft, SQLITE_TRANSIENT);
    }
  }
  break;
#endif /* SQLITE_OMIT_SCHEMA_VERSION_PRAGMAS */

      { OP_Integer,     0, 2,        0},
      { OP_Subtract,    1, 2,        1},
      { OP_IfPos,       1, 8,        0},
      { OP_Integer,     0, 1,        0},                         /* 6 */
      { OP_Noop,        0, 0,        0},
      { OP_ResultRow,   1, 1,        0},
    };
    VdbeOp *aOp;
    sqlite3VdbeUsesBtree(v, iDb);
    if( !zRight ){
      setOneColumnName(v, "cache_size");
      pParse->nMem += 2;
      sqlite3VdbeVerifyNoMallocRequired(v, ArraySize(getCacheSize));
      aOp = sqlite3VdbeAddOpList(v, ArraySize(getCacheSize), getCacheSize, iLn);

      if( ONLY_IF_REALLOC_STRESS(aOp==0) ) break;
      aOp[0].p1 = iDb;
      aOp[1].p1 = iDb;
      aOp[6].p1 = SQLITE_DEFAULT_CACHE_SIZE;
    }else{
      int size = sqlite3AbsInt32(sqlite3Atoi(zRight));
      sqlite3BeginWriteOperation(pParse, 0, iDb);
      sqlite3VdbeAddOp2(v, OP_Integer, size, 1);
      sqlite3VdbeAddOp3(v, OP_SetCookie, iDb, BTREE_DEFAULT_CACHE_SIZE, 1);
      assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
      pDb->pSchema->cache_size = size;
................................................................................
          { OP_Transaction,    0,         1,                 0},    /* 0 */
          { OP_ReadCookie,     0,         1,         BTREE_LARGEST_ROOT_PAGE},
          { OP_If,             1,         0,                 0},    /* 2 */
          { OP_Halt,           SQLITE_OK, OE_Abort,          0},    /* 3 */
          { OP_Integer,        0,         1,                 0},    /* 4 */
          { OP_SetCookie,      0,         BTREE_INCR_VACUUM, 1},    /* 5 */
        };
        VdbeOp *aOp;
        int iAddr = sqlite3VdbeCurrentAddr(v);
        sqlite3VdbeVerifyNoMallocRequired(v, ArraySize(setMeta6));
        aOp = sqlite3VdbeAddOpList(v, ArraySize(setMeta6), setMeta6, iLn);


        if( ONLY_IF_REALLOC_STRESS(aOp==0) ) break;
        aOp[0].p1 = iDb;
        aOp[1].p1 = iDb;
        aOp[2].p2 = iAddr+4;
        aOp[4].p1 = eAuto - 1;
        aOp[5].p1 = iDb;
        sqlite3VdbeUsesBtree(v, iDb);
      }
    }
    break;
  }
#endif

................................................................................
  /* Pragma "quick_check" is reduced version of 
  ** integrity_check designed to detect most database corruption
  ** without most of the overhead of a full integrity-check.
  */
  case PragTyp_INTEGRITY_CHECK: {
    int i, j, addr, mxErr;













    int isQuick = (sqlite3Tolower(zLeft[0])=='q');

    /* If the PRAGMA command was of the form "PRAGMA <db>.integrity_check",
    ** then iDb is set to the index of the database identified by <db>.
    ** In this case, the integrity of database iDb only is verified by
    ** the VDBE created below.
    **
................................................................................
          sqlite3VdbeLoadString(v, 3, pIdx->zName);
          sqlite3VdbeAddOp3(v, OP_Concat, 3, 2, 7);
          sqlite3VdbeAddOp2(v, OP_ResultRow, 7, 1);
        }
#endif /* SQLITE_OMIT_BTREECOUNT */
      } 
    }
    {
      static const int iLn = VDBE_OFFSET_LINENO(2);
      static const VdbeOpList endCode[] = {
        { OP_AddImm,      1, 0,        0},    /* 0 */
        { OP_If,          1, 0,        0},    /* 1 */
        { OP_String8,     0, 3,        0},    /* 2 */
        { OP_ResultRow,   3, 1,        0},
      };
      VdbeOp *aOp;

      aOp = sqlite3VdbeAddOpList(v, ArraySize(endCode), endCode, iLn);



      if( aOp ){
        aOp[0].p2 = -mxErr;
        aOp[1].p2 = sqlite3VdbeCurrentAddr(v);
        aOp[2].p4type = P4_STATIC;
        aOp[2].p4.z = "ok";
      }
    }
  }
  break;
#endif /* SQLITE_OMIT_INTEGRITY_CHECK */

#ifndef SQLITE_OMIT_UTF16
  /*
  **   PRAGMA encoding
................................................................................
    if( zRight && (pPragma->mPragFlag & PragFlag_ReadOnly)==0 ){
      /* Write the specified cookie value */
      static const VdbeOpList setCookie[] = {
        { OP_Transaction,    0,  1,  0},    /* 0 */
        { OP_Integer,        0,  1,  0},    /* 1 */
        { OP_SetCookie,      0,  0,  1},    /* 2 */
      };
      VdbeOp *aOp;
      sqlite3VdbeVerifyNoMallocRequired(v, ArraySize(setCookie));
      aOp = sqlite3VdbeAddOpList(v, ArraySize(setCookie), setCookie, 0);
      if( ONLY_IF_REALLOC_STRESS(aOp==0) ) break;
      aOp[0].p1 = iDb;
      aOp[1].p1 = sqlite3Atoi(zRight);
      aOp[2].p1 = iDb;
      aOp[2].p2 = iCookie;
    }else{
      /* Read the specified cookie value */
      static const VdbeOpList readCookie[] = {
        { OP_Transaction,     0,  0,  0},    /* 0 */
        { OP_ReadCookie,      0,  1,  0},    /* 1 */
        { OP_ResultRow,       1,  1,  0}
      };
      VdbeOp *aOp;
      sqlite3VdbeVerifyNoMallocRequired(v, ArraySize(readCookie));
      aOp = sqlite3VdbeAddOpList(v, ArraySize(readCookie),readCookie,0);
      if( ONLY_IF_REALLOC_STRESS(aOp==0) ) break;
      aOp[0].p1 = iDb;
      aOp[1].p1 = iDb;
      aOp[1].p3 = iCookie;
      sqlite3VdbeSetNumCols(v, 1);
      sqlite3VdbeSetColName(v, 0, COLNAME_NAME, zLeft, SQLITE_TRANSIENT);
    }
  }
  break;
#endif /* SQLITE_OMIT_SCHEMA_VERSION_PRAGMAS */

*/
static int sqlite3InitOne(sqlite3 *db, int iDb, char **pzErrMsg){
  int rc;
  int i;
#ifndef SQLITE_OMIT_DEPRECATED
  int size;
#endif
  Table *pTab;
  Db *pDb;
  char const *azArg[4];
  int meta[5];
  InitData initData;
  char const *zMasterSchema;
  char const *zMasterName;
  int openedTransaction = 0;

  /*
  ** The master database table has a structure like this
  */
  static const char master_schema[] = 
     "CREATE TABLE sqlite_master(\n"
     "  type text,\n"
     "  name text,\n"
     "  tbl_name text,\n"
     "  rootpage integer,\n"
     "  sql text\n"
     ")"
  ;
#ifndef SQLITE_OMIT_TEMPDB
  static const char temp_master_schema[] = 
     "CREATE TEMP TABLE sqlite_temp_master(\n"
     "  type text,\n"
     "  name text,\n"
     "  tbl_name text,\n"
     "  rootpage integer,\n"
     "  sql text\n"
     ")"
  ;
#else
  #define temp_master_schema 0
#endif

  assert( iDb>=0 && iDb<db->nDb );
  assert( db->aDb[iDb].pSchema );
  assert( sqlite3_mutex_held(db->mutex) );
  assert( iDb==1 || sqlite3BtreeHoldsMutex(db->aDb[iDb].pBt) );

  /* zMasterSchema and zInitScript are set to point at the master schema
  ** and initialisation script appropriate for the database being
  ** initialized. zMasterName is the name of the master table.
  */
  if( !OMIT_TEMPDB && iDb==1 ){
    zMasterSchema = temp_master_schema;
  }else{
    zMasterSchema = master_schema;
  }
  zMasterName = SCHEMA_TABLE(iDb);





  /* Construct the schema tables.  */
  azArg[0] = zMasterName;
  azArg[1] = "1";
  azArg[2] = zMasterSchema;


  azArg[3] = 0;
  initData.db = db;
  initData.iDb = iDb;
  initData.rc = SQLITE_OK;
  initData.pzErrMsg = pzErrMsg;
  sqlite3InitCallback(&initData, 3, (char **)azArg, 0);
  if( initData.rc ){
    rc = initData.rc;
    goto error_out;
  }
  pTab = sqlite3FindTable(db, zMasterName, db->aDb[iDb].zName);
  if( ALWAYS(pTab) ){
    pTab->tabFlags |= TF_Readonly;
  }

  /* Create a cursor to hold the database open
  */
  pDb = &db->aDb[iDb];
  if( pDb->pBt==0 ){
    if( !OMIT_TEMPDB && ALWAYS(iDb==1) ){
      DbSetProperty(db, 1, DB_SchemaLoaded);
................................................................................

  /* Read the schema information out of the schema tables
  */
  assert( db->init.busy );
  {
    char *zSql;
    zSql = sqlite3MPrintf(db, 
        "SELECT name, rootpage, sql FROM '%q'.%s ORDER BY rowid",
        db->aDb[iDb].zName, zMasterName);
#ifndef SQLITE_OMIT_AUTHORIZATION
    {
      sqlite3_xauth xAuth;
      xAuth = db->xAuth;
      db->xAuth = 0;
#endif

*/
static int sqlite3InitOne(sqlite3 *db, int iDb, char **pzErrMsg){
  int rc;
  int i;
#ifndef SQLITE_OMIT_DEPRECATED
  int size;
#endif

  Db *pDb;
  char const *azArg[4];
  int meta[5];
  InitData initData;

  const char *zMasterName;
  int openedTransaction = 0;



























  assert( iDb>=0 && iDb<db->nDb );
  assert( db->aDb[iDb].pSchema );
  assert( sqlite3_mutex_held(db->mutex) );
  assert( iDb==1 || sqlite3BtreeHoldsMutex(db->aDb[iDb].pBt) );












  /* Construct the in-memory representation schema tables (sqlite_master or
  ** sqlite_temp_master) by invoking the parser directly.  The appropriate
  ** table name will be inserted automatically by the parser so we can just
  ** use the abbreviation "x" here.  The parser will also automatically tag
  ** the schema table as read-only. */
  azArg[0] = zMasterName = SCHEMA_TABLE(iDb);
  azArg[1] = "1";

  azArg[2] = "CREATE TABLE x(type text,name text,tbl_name text,"
                            "rootpage integer,sql text)";
  azArg[3] = 0;
  initData.db = db;
  initData.iDb = iDb;
  initData.rc = SQLITE_OK;
  initData.pzErrMsg = pzErrMsg;
  sqlite3InitCallback(&initData, 3, (char **)azArg, 0);
  if( initData.rc ){
    rc = initData.rc;
    goto error_out;
  }





  /* Create a cursor to hold the database open
  */
  pDb = &db->aDb[iDb];
  if( pDb->pBt==0 ){
    if( !OMIT_TEMPDB && ALWAYS(iDb==1) ){
      DbSetProperty(db, 1, DB_SchemaLoaded);
................................................................................

  /* Read the schema information out of the schema tables
  */
  assert( db->init.busy );
  {
    char *zSql;
    zSql = sqlite3MPrintf(db, 
        "SELECT name, rootpage, sql FROM \"%w\".%s ORDER BY rowid",
        db->aDb[iDb].zName, zMasterName);
#ifndef SQLITE_OMIT_AUTHORIZATION
    {
      sqlite3_xauth xAuth;
      xAuth = db->xAuth;
      db->xAuth = 0;
#endif

        pDef = sqlite3FindFunction(pParse->db, zId, nId, -2, enc, 0);
        if( pDef==0 ){
          no_such_func = 1;
        }else{
          wrong_num_args = 1;
        }
      }else{
        is_agg = pDef->xFunc==0;
        if( pDef->funcFlags & SQLITE_FUNC_UNLIKELY ){
          ExprSetProperty(pExpr, EP_Unlikely|EP_Skip);
          if( n==2 ){
            pExpr->iTable = exprProbability(pList->a[1].pExpr);
            if( pExpr->iTable<0 ){
              sqlite3ErrorMsg(pParse,
                "second argument to likelihood() must be a "
................................................................................
      return 1;
    }
    pParse->nHeight += pExpr->nHeight;
  }
#endif
  savedHasAgg = pNC->ncFlags & (NC_HasAgg|NC_MinMaxAgg);
  pNC->ncFlags &= ~(NC_HasAgg|NC_MinMaxAgg);
  memset(&w, 0, sizeof(w));
  w.xExprCallback = resolveExprStep;
  w.xSelectCallback = resolveSelectStep;
  w.pParse = pNC->pParse;


  w.u.pNC = pNC;
  sqlite3WalkExpr(&w, pExpr);
#if SQLITE_MAX_EXPR_DEPTH>0
  pNC->pParse->nHeight -= pExpr->nHeight;
#endif
  if( pNC->nErr>0 || w.pParse->nErr>0 ){
    ExprSetProperty(pExpr, EP_Error);

        pDef = sqlite3FindFunction(pParse->db, zId, nId, -2, enc, 0);
        if( pDef==0 ){
          no_such_func = 1;
        }else{
          wrong_num_args = 1;
        }
      }else{
        is_agg = pDef->xFinalize!=0;
        if( pDef->funcFlags & SQLITE_FUNC_UNLIKELY ){
          ExprSetProperty(pExpr, EP_Unlikely|EP_Skip);
          if( n==2 ){
            pExpr->iTable = exprProbability(pList->a[1].pExpr);
            if( pExpr->iTable<0 ){
              sqlite3ErrorMsg(pParse,
                "second argument to likelihood() must be a "
................................................................................
      return 1;
    }
    pParse->nHeight += pExpr->nHeight;
  }
#endif
  savedHasAgg = pNC->ncFlags & (NC_HasAgg|NC_MinMaxAgg);
  pNC->ncFlags &= ~(NC_HasAgg|NC_MinMaxAgg);
  w.pParse = pNC->pParse;
  w.xExprCallback = resolveExprStep;
  w.xSelectCallback = resolveSelectStep;
  w.xSelectCallback2 = 0;
  w.walkerDepth = 0;
  w.eCode = 0;
  w.u.pNC = pNC;
  sqlite3WalkExpr(&w, pExpr);
#if SQLITE_MAX_EXPR_DEPTH>0
  pNC->pParse->nHeight -= pExpr->nHeight;
#endif
  if( pNC->nErr>0 || w.pParse->nErr>0 ){
    ExprSetProperty(pExpr, EP_Error);

}

/*
** Allocate a KeyInfo object sufficient for an index of N key columns and
** X extra columns.
*/
KeyInfo *sqlite3KeyInfoAlloc(sqlite3 *db, int N, int X){
  KeyInfo *p = sqlite3DbMallocZero(0, 
                   sizeof(KeyInfo) + (N+X)*(sizeof(CollSeq*)+1));
  if( p ){
    p->aSortOrder = (u8*)&p->aColl[N+X];
    p->nField = (u16)N;
    p->nXField = (u16)X;
    p->enc = ENC(db);
    p->db = db;
    p->nRef = 1;

  }else{
    db->mallocFailed = 1;
  }
  return p;
}

/*

}

/*
** Allocate a KeyInfo object sufficient for an index of N key columns and
** X extra columns.
*/
KeyInfo *sqlite3KeyInfoAlloc(sqlite3 *db, int N, int X){
  int nExtra = (N+X)*(sizeof(CollSeq*)+1);
  KeyInfo *p = sqlite3Malloc(sizeof(KeyInfo) + nExtra);
  if( p ){
    p->aSortOrder = (u8*)&p->aColl[N+X];
    p->nField = (u16)N;
    p->nXField = (u16)X;
    p->enc = ENC(db);
    p->db = db;
    p->nRef = 1;
    memset(&p[1], 0, nExtra);
  }else{
    db->mallocFailed = 1;
  }
  return p;
}

/*

# define ALWAYS(X)      ((X)?1:(assert(0),0))
# define NEVER(X)       ((X)?(assert(0),1):0)
#else
# define ALWAYS(X)      (X)
# define NEVER(X)       (X)
#endif
















/*
** Declarations used for tracing the operating system interfaces.
*/
#if defined(SQLITE_FORCE_OS_TRACE) || defined(SQLITE_TEST) || \
    (defined(SQLITE_DEBUG) && SQLITE_OS_WIN)
  extern int sqlite3OSTrace;
# define OSTRACE(X)          if( sqlite3OSTrace ) sqlite3DebugPrintf X
................................................................................
** points to a linked list of these structures.
*/
struct FuncDef {
  i16 nArg;            /* Number of arguments.  -1 means unlimited */
  u16 funcFlags;       /* Some combination of SQLITE_FUNC_* */
  void *pUserData;     /* User data parameter */
  FuncDef *pNext;      /* Next function with same name */
  void (*xFunc)(sqlite3_context*,int,sqlite3_value**); /* Regular function */
  void (*xStep)(sqlite3_context*,int,sqlite3_value**); /* Aggregate step */
  void (*xFinalize)(sqlite3_context*);                /* Aggregate finalizer */
  char *zName;         /* SQL name of the function. */
  FuncDef *pHash;      /* Next with a different name but the same hash */
  FuncDestructor *pDestructor;   /* Reference counted destructor function */
};

/*
** This structure encapsulates a user-function destructor callback (as
................................................................................
**     function likeFunc. Argument pArg is cast to a (void *) and made
**     available as the function user-data (sqlite3_user_data()). The
**     FuncDef.flags variable is set to the value passed as the flags
**     parameter.
*/
#define FUNCTION(zName, nArg, iArg, bNC, xFunc) \
  {nArg, SQLITE_FUNC_CONSTANT|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, 0, #zName, 0, 0}
#define VFUNCTION(zName, nArg, iArg, bNC, xFunc) \
  {nArg, SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, 0, #zName, 0, 0}
#define DFUNCTION(zName, nArg, iArg, bNC, xFunc) \
  {nArg, SQLITE_FUNC_SLOCHNG|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, 0, #zName, 0, 0}
#define FUNCTION2(zName, nArg, iArg, bNC, xFunc, extraFlags) \
  {nArg,SQLITE_FUNC_CONSTANT|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL)|extraFlags,\
   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, 0, #zName, 0, 0}
#define STR_FUNCTION(zName, nArg, pArg, bNC, xFunc) \
  {nArg, SQLITE_FUNC_SLOCHNG|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
   pArg, 0, xFunc, 0, 0, #zName, 0, 0}
#define LIKEFUNC(zName, nArg, arg, flags) \
  {nArg, SQLITE_FUNC_CONSTANT|SQLITE_UTF8|flags, \
   (void *)arg, 0, likeFunc, 0, 0, #zName, 0, 0}
#define AGGREGATE(zName, nArg, arg, nc, xStep, xFinal) \
  {nArg, SQLITE_UTF8|(nc*SQLITE_FUNC_NEEDCOLL), \
   SQLITE_INT_TO_PTR(arg), 0, 0, xStep,xFinal,#zName,0,0}
#define AGGREGATE2(zName, nArg, arg, nc, xStep, xFinal, extraFlags) \
  {nArg, SQLITE_UTF8|(nc*SQLITE_FUNC_NEEDCOLL)|extraFlags, \
   SQLITE_INT_TO_PTR(arg), 0, 0, xStep,xFinal,#zName,0,0}

/*
** All current savepoints are stored in a linked list starting at
** sqlite3.pSavepoint. The first element in the list is the most recently
** opened savepoint. Savepoints are added to the list by the vdbe
** OP_Savepoint instruction.
*/
................................................................................
  /************************************************************************
  ** Above is constant between recursions.  Below is reset before and after
  ** each recursion.  The boundary between these two regions is determined
  ** using offsetof(Parse,nVar) so the nVar field must be the first field
  ** in the recursive region.
  ************************************************************************/

  int nVar;                 /* Number of '?' variables seen in the SQL so far */
  int nzVar;                /* Number of available slots in azVar[] */
  u8 iPkSortOrder;          /* ASC or DESC for INTEGER PRIMARY KEY */
  u8 explain;               /* True if the EXPLAIN flag is found on the query */
#ifndef SQLITE_OMIT_VIRTUALTABLE
  u8 declareVtab;           /* True if inside sqlite3_declare_vtab() */
  int nVtabLock;            /* Number of virtual tables to lock */
#endif
................................................................................
*/
#define CORRUPT_DB  (sqlite3Config.neverCorrupt==0)

/*
** Context pointer passed down through the tree-walk.
*/
struct Walker {

  int (*xExprCallback)(Walker*, Expr*);     /* Callback for expressions */
  int (*xSelectCallback)(Walker*,Select*);  /* Callback for SELECTs */
  void (*xSelectCallback2)(Walker*,Select*);/* Second callback for SELECTs */
  Parse *pParse;                            /* Parser context.  */
  int walkerDepth;                          /* Number of subqueries */
  u8 eCode;                                 /* A small processing code */
  union {                                   /* Extra data for callback */
    NameContext *pNC;                          /* Naming context */
    int n;                                     /* A counter */
    int iCur;                                  /* A cursor number */
    SrcList *pSrcList;                         /* FROM clause */

# define ALWAYS(X)      ((X)?1:(assert(0),0))
# define NEVER(X)       ((X)?(assert(0),1):0)
#else
# define ALWAYS(X)      (X)
# define NEVER(X)       (X)
#endif

/*
** Some malloc failures are only possible if SQLITE_TEST_REALLOC_STRESS is
** defined.  We need to defend against those failures when testing with
** SQLITE_TEST_REALLOC_STRESS, but we don't want the unreachable branches
** during a normal build.  The following macro can be used to disable tests
** that are always false except when SQLITE_TEST_REALLOC_STRESS is set.
*/
#if defined(SQLITE_TEST_REALLOC_STRESS)
# define ONLY_IF_REALLOC_STRESS(X)  (X)
#elif !defined(NDEBUG)
# define ONLY_IF_REALLOC_STRESS(X)  ((X)?(assert(0),1):0)
#else
# define ONLY_IF_REALLOC_STRESS(X)  (0)
#endif

/*
** Declarations used for tracing the operating system interfaces.
*/
#if defined(SQLITE_FORCE_OS_TRACE) || defined(SQLITE_TEST) || \
    (defined(SQLITE_DEBUG) && SQLITE_OS_WIN)
  extern int sqlite3OSTrace;
# define OSTRACE(X)          if( sqlite3OSTrace ) sqlite3DebugPrintf X
................................................................................
** points to a linked list of these structures.
*/
struct FuncDef {
  i16 nArg;            /* Number of arguments.  -1 means unlimited */
  u16 funcFlags;       /* Some combination of SQLITE_FUNC_* */
  void *pUserData;     /* User data parameter */
  FuncDef *pNext;      /* Next function with same name */
  void (*xSFunc)(sqlite3_context*,int,sqlite3_value**); /* func or agg-step */

  void (*xFinalize)(sqlite3_context*);                  /* Agg finalizer */
  char *zName;         /* SQL name of the function. */
  FuncDef *pHash;      /* Next with a different name but the same hash */
  FuncDestructor *pDestructor;   /* Reference counted destructor function */
};

/*
** This structure encapsulates a user-function destructor callback (as
................................................................................
**     function likeFunc. Argument pArg is cast to a (void *) and made
**     available as the function user-data (sqlite3_user_data()). The
**     FuncDef.flags variable is set to the value passed as the flags
**     parameter.
*/
#define FUNCTION(zName, nArg, iArg, bNC, xFunc) \
  {nArg, SQLITE_FUNC_CONSTANT|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, #zName, 0, 0}
#define VFUNCTION(zName, nArg, iArg, bNC, xFunc) \
  {nArg, SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, #zName, 0, 0}
#define DFUNCTION(zName, nArg, iArg, bNC, xFunc) \
  {nArg, SQLITE_FUNC_SLOCHNG|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, #zName, 0, 0}
#define FUNCTION2(zName, nArg, iArg, bNC, xFunc, extraFlags) \
  {nArg,SQLITE_FUNC_CONSTANT|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL)|extraFlags,\
   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, #zName, 0, 0}
#define STR_FUNCTION(zName, nArg, pArg, bNC, xFunc) \
  {nArg, SQLITE_FUNC_SLOCHNG|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
   pArg, 0, xFunc, 0, #zName, 0, 0}
#define LIKEFUNC(zName, nArg, arg, flags) \
  {nArg, SQLITE_FUNC_CONSTANT|SQLITE_UTF8|flags, \
   (void *)arg, 0, likeFunc, 0, #zName, 0, 0}
#define AGGREGATE(zName, nArg, arg, nc, xStep, xFinal) \
  {nArg, SQLITE_UTF8|(nc*SQLITE_FUNC_NEEDCOLL), \
   SQLITE_INT_TO_PTR(arg), 0, xStep,xFinal,#zName,0,0}
#define AGGREGATE2(zName, nArg, arg, nc, xStep, xFinal, extraFlags) \
  {nArg, SQLITE_UTF8|(nc*SQLITE_FUNC_NEEDCOLL)|extraFlags, \
   SQLITE_INT_TO_PTR(arg), 0, xStep,xFinal,#zName,0,0}

/*
** All current savepoints are stored in a linked list starting at
** sqlite3.pSavepoint. The first element in the list is the most recently
** opened savepoint. Savepoints are added to the list by the vdbe
** OP_Savepoint instruction.
*/
................................................................................
  /************************************************************************
  ** Above is constant between recursions.  Below is reset before and after
  ** each recursion.  The boundary between these two regions is determined
  ** using offsetof(Parse,nVar) so the nVar field must be the first field
  ** in the recursive region.
  ************************************************************************/

  ynVar nVar;               /* Number of '?' variables seen in the SQL so far */
  int nzVar;                /* Number of available slots in azVar[] */
  u8 iPkSortOrder;          /* ASC or DESC for INTEGER PRIMARY KEY */
  u8 explain;               /* True if the EXPLAIN flag is found on the query */
#ifndef SQLITE_OMIT_VIRTUALTABLE
  u8 declareVtab;           /* True if inside sqlite3_declare_vtab() */
  int nVtabLock;            /* Number of virtual tables to lock */
#endif
................................................................................
*/
#define CORRUPT_DB  (sqlite3Config.neverCorrupt==0)

/*
** Context pointer passed down through the tree-walk.
*/
struct Walker {
  Parse *pParse;                            /* Parser context.  */
  int (*xExprCallback)(Walker*, Expr*);     /* Callback for expressions */
  int (*xSelectCallback)(Walker*,Select*);  /* Callback for SELECTs */
  void (*xSelectCallback2)(Walker*,Select*);/* Second callback for SELECTs */

  int walkerDepth;                          /* Number of subqueries */
  u8 eCode;                                 /* A small processing code */
  union {                                   /* Extra data for callback */
    NameContext *pNC;                          /* Naming context */
    int n;                                     /* A counter */
    int iCur;                                  /* A cursor number */
    SrcList *pSrcList;                         /* FROM clause */

  assert( pPrg || pParse->nErr || pParse->db->mallocFailed );

  /* Code the OP_Program opcode in the parent VDBE. P4 of the OP_Program 
  ** is a pointer to the sub-vdbe containing the trigger program.  */
  if( pPrg ){
    int bRecursive = (p->zName && 0==(pParse->db->flags&SQLITE_RecTriggers));

    sqlite3VdbeAddOp3(v, OP_Program, reg, ignoreJump, ++pParse->nMem);
    sqlite3VdbeChangeP4(v, -1, (const char *)pPrg->pProgram, P4_SUBPROGRAM);
    VdbeComment(
        (v, "Call: %s.%s", (p->zName?p->zName:"fkey"), onErrorText(orconf)));

    /* Set the P5 operand of the OP_Program instruction to non-zero if
    ** recursive invocation of this trigger program is disallowed. Recursive
    ** invocation is disallowed if (a) the sub-program is really a trigger,
    ** not a foreign key action, and (b) the flag to enable recursive triggers

  assert( pPrg || pParse->nErr || pParse->db->mallocFailed );

  /* Code the OP_Program opcode in the parent VDBE. P4 of the OP_Program 
  ** is a pointer to the sub-vdbe containing the trigger program.  */
  if( pPrg ){
    int bRecursive = (p->zName && 0==(pParse->db->flags&SQLITE_RecTriggers));

    sqlite3VdbeAddOp4(v, OP_Program, reg, ignoreJump, ++pParse->nMem,
                      (const char *)pPrg->pProgram, P4_SUBPROGRAM);
    VdbeComment(
        (v, "Call: %s.%s", (p->zName?p->zName:"fkey"), onErrorText(orconf)));

    /* Set the P5 operand of the OP_Program instruction to non-zero if
    ** recursive invocation of this trigger program is disallowed. Recursive
    ** invocation is disallowed if (a) the sub-program is really a trigger,
    ** not a foreign key action, and (b) the flag to enable recursive triggers

    assert( memIsValid(pCtx->argv[i]) );
    REGISTER_TRACE(pOp->p2+i, pCtx->argv[i]);
  }
#endif
  MemSetTypeFlag(pCtx->pOut, MEM_Null);
  pCtx->fErrorOrAux = 0;
  db->lastRowid = lastRowid;
  (*pCtx->pFunc->xFunc)(pCtx, pCtx->argc, pCtx->argv); /* IMP: R-24505-23230 */
  lastRowid = db->lastRowid;  /* Remember rowid changes made by xFunc */

  /* If the function returned an error, throw an exception */
  if( pCtx->fErrorOrAux ){
    if( pCtx->isError ){
      sqlite3VdbeError(p, "%s", sqlite3_value_text(pCtx->pOut));
      rc = pCtx->isError;
    }
................................................................................
** See also: Clear
*/
case OP_Destroy: {     /* out2 */
  int iMoved;
  int iDb;

  assert( p->readOnly==0 );

  pOut = out2Prerelease(p, pOp);
  pOut->flags = MEM_Null;
  if( db->nVdbeRead > db->nVDestroy+1 ){
    rc = SQLITE_LOCKED;
    p->errorAction = OE_Abort;
  }else{
    iDb = pOp->p3;
................................................................................
#endif

  pMem->n++;
  sqlite3VdbeMemInit(&t, db, MEM_Null);
  pCtx->pOut = &t;
  pCtx->fErrorOrAux = 0;
  pCtx->skipFlag = 0;
  (pCtx->pFunc->xStep)(pCtx,pCtx->argc,pCtx->argv); /* IMP: R-24505-23230 */
  if( pCtx->fErrorOrAux ){
    if( pCtx->isError ){
      sqlite3VdbeError(p, "%s", sqlite3_value_text(&t));
      rc = pCtx->isError;
    }
    sqlite3VdbeMemRelease(&t);
  }else{

    assert( memIsValid(pCtx->argv[i]) );
    REGISTER_TRACE(pOp->p2+i, pCtx->argv[i]);
  }
#endif
  MemSetTypeFlag(pCtx->pOut, MEM_Null);
  pCtx->fErrorOrAux = 0;
  db->lastRowid = lastRowid;
  (*pCtx->pFunc->xSFunc)(pCtx, pCtx->argc, pCtx->argv);/* IMP: R-24505-23230 */
  lastRowid = db->lastRowid;  /* Remember rowid changes made by xSFunc */

  /* If the function returned an error, throw an exception */
  if( pCtx->fErrorOrAux ){
    if( pCtx->isError ){
      sqlite3VdbeError(p, "%s", sqlite3_value_text(pCtx->pOut));
      rc = pCtx->isError;
    }
................................................................................
** See also: Clear
*/
case OP_Destroy: {     /* out2 */
  int iMoved;
  int iDb;

  assert( p->readOnly==0 );
  assert( pOp->p1>1 );
  pOut = out2Prerelease(p, pOp);
  pOut->flags = MEM_Null;
  if( db->nVdbeRead > db->nVDestroy+1 ){
    rc = SQLITE_LOCKED;
    p->errorAction = OE_Abort;
  }else{
    iDb = pOp->p3;
................................................................................
#endif

  pMem->n++;
  sqlite3VdbeMemInit(&t, db, MEM_Null);
  pCtx->pOut = &t;
  pCtx->fErrorOrAux = 0;
  pCtx->skipFlag = 0;
  (pCtx->pFunc->xSFunc)(pCtx,pCtx->argc,pCtx->argv); /* IMP: R-24505-23230 */
  if( pCtx->fErrorOrAux ){
    if( pCtx->isError ){
      sqlite3VdbeError(p, "%s", sqlite3_value_text(&t));
      rc = pCtx->isError;
    }
    sqlite3VdbeMemRelease(&t);
  }else{

int sqlite3VdbeGoto(Vdbe*,int);
int sqlite3VdbeLoadString(Vdbe*,int,const char*);
void sqlite3VdbeMultiLoad(Vdbe*,int,const char*,...);
int sqlite3VdbeAddOp3(Vdbe*,int,int,int,int);
int sqlite3VdbeAddOp4(Vdbe*,int,int,int,int,const char *zP4,int);
int sqlite3VdbeAddOp4Dup8(Vdbe*,int,int,int,int,const u8*,int);
int sqlite3VdbeAddOp4Int(Vdbe*,int,int,int,int,int);





int sqlite3VdbeAddOpList(Vdbe*, int nOp, VdbeOpList const *aOp, int iLineno);
void sqlite3VdbeAddParseSchemaOp(Vdbe*,int,char*);
void sqlite3VdbeChangeOpcode(Vdbe*, u32 addr, u8);
void sqlite3VdbeChangeP1(Vdbe*, u32 addr, int P1);
void sqlite3VdbeChangeP2(Vdbe*, u32 addr, int P2);
void sqlite3VdbeChangeP3(Vdbe*, u32 addr, int P3);
void sqlite3VdbeChangeP5(Vdbe*, u8 P5);
void sqlite3VdbeJumpHere(Vdbe*, int addr);
void sqlite3VdbeChangeToNoop(Vdbe*, int addr);
int sqlite3VdbeDeletePriorOpcode(Vdbe*, u8 op);
void sqlite3VdbeChangeP4(Vdbe*, int addr, const char *zP4, int N);
void sqlite3VdbeSetP4KeyInfo(Parse*, Index*);
void sqlite3VdbeUsesBtree(Vdbe*, int);
VdbeOp *sqlite3VdbeGetOp(Vdbe*, int);
int sqlite3VdbeMakeLabel(Vdbe*);
void sqlite3VdbeRunOnlyOnce(Vdbe*);

int sqlite3VdbeGoto(Vdbe*,int);
int sqlite3VdbeLoadString(Vdbe*,int,const char*);
void sqlite3VdbeMultiLoad(Vdbe*,int,const char*,...);
int sqlite3VdbeAddOp3(Vdbe*,int,int,int,int);
int sqlite3VdbeAddOp4(Vdbe*,int,int,int,int,const char *zP4,int);
int sqlite3VdbeAddOp4Dup8(Vdbe*,int,int,int,int,const u8*,int);
int sqlite3VdbeAddOp4Int(Vdbe*,int,int,int,int,int);
#if defined(SQLITE_DEBUG) && !defined(SQLITE_TEST_REALLOC_STRESS)
  void sqlite3VdbeVerifyNoMallocRequired(Vdbe *p, int N);
#else
# define sqlite3VdbeVerifyNoMallocRequired(A,B)
#endif
VdbeOp *sqlite3VdbeAddOpList(Vdbe*, int nOp, VdbeOpList const *aOp, int iLineno);
void sqlite3VdbeAddParseSchemaOp(Vdbe*,int,char*);
void sqlite3VdbeChangeOpcode(Vdbe*, u32 addr, u8);
void sqlite3VdbeChangeP1(Vdbe*, u32 addr, int P1);
void sqlite3VdbeChangeP2(Vdbe*, u32 addr, int P2);
void sqlite3VdbeChangeP3(Vdbe*, u32 addr, int P3);
void sqlite3VdbeChangeP5(Vdbe*, u8 P5);
void sqlite3VdbeJumpHere(Vdbe*, int addr);
int sqlite3VdbeChangeToNoop(Vdbe*, int addr);
int sqlite3VdbeDeletePriorOpcode(Vdbe*, u8 op);
void sqlite3VdbeChangeP4(Vdbe*, int addr, const char *zP4, int N);
void sqlite3VdbeSetP4KeyInfo(Parse*, Index*);
void sqlite3VdbeUsesBtree(Vdbe*, int);
VdbeOp *sqlite3VdbeGetOp(Vdbe*, int);
int sqlite3VdbeMakeLabel(Vdbe*);
void sqlite3VdbeRunOnlyOnce(Vdbe*);

/*
** Allocate or return the aggregate context for a user function.  A new
** context is allocated on the first call.  Subsequent calls return the
** same context that was returned on prior calls.
*/
void *sqlite3_aggregate_context(sqlite3_context *p, int nByte){
  assert( p && p->pFunc && p->pFunc->xStep );
  assert( sqlite3_mutex_held(p->pOut->db->mutex) );
  testcase( nByte<0 );
  if( (p->pMem->flags & MEM_Agg)==0 ){
    return createAggContext(p, nByte);
  }else{
    return (void*)p->pMem->z;
  }
................................................................................
**
** This function is deprecated.  Do not use it for new code.  It is
** provide only to avoid breaking legacy code.  New aggregate function
** implementations should keep their own counts within their aggregate
** context.
*/
int sqlite3_aggregate_count(sqlite3_context *p){
  assert( p && p->pMem && p->pFunc && p->pFunc->xStep );
  return p->pMem->n;
}
#endif

/*
** Return the number of columns in the result set for the statement pStmt.
*/

/*
** Allocate or return the aggregate context for a user function.  A new
** context is allocated on the first call.  Subsequent calls return the
** same context that was returned on prior calls.
*/
void *sqlite3_aggregate_context(sqlite3_context *p, int nByte){
  assert( p && p->pFunc && p->pFunc->xFinalize );
  assert( sqlite3_mutex_held(p->pOut->db->mutex) );
  testcase( nByte<0 );
  if( (p->pMem->flags & MEM_Agg)==0 ){
    return createAggContext(p, nByte);
  }else{
    return (void*)p->pMem->z;
  }
................................................................................
**
** This function is deprecated.  Do not use it for new code.  It is
** provide only to avoid breaking legacy code.  New aggregate function
** implementations should keep their own counts within their aggregate
** context.
*/
int sqlite3_aggregate_count(sqlite3_context *p){
  assert( p && p->pMem && p->pFunc && p->pFunc->xFinalize );
  return p->pMem->n;
}
#endif

/*
** Return the number of columns in the result set for the statement pStmt.
*/

  va_list ap;
  int i;
  char c;
  va_start(ap, zTypes);
  for(i=0; (c = zTypes[i])!=0; i++){
    if( c=='s' ){
      const char *z = va_arg(ap, const char*);
      int addr = sqlite3VdbeAddOp2(p, z==0 ? OP_Null : OP_String8, 0, iDest++);
      if( z ) sqlite3VdbeChangeP4(p, addr, z, 0);
    }else{
      assert( c=='i' );
      sqlite3VdbeAddOp2(p, OP_Integer, va_arg(ap, int), iDest++);
    }
  }
  va_end(ap);
}
................................................................................
** Return the address of the next instruction to be inserted.
*/
int sqlite3VdbeCurrentAddr(Vdbe *p){
  assert( p->magic==VDBE_MAGIC_INIT );
  return p->nOp;
}















/*
** This function returns a pointer to the array of opcodes associated with
** the Vdbe passed as the first argument. It is the callers responsibility
** to arrange for the returned array to be eventually freed using the 
** vdbeFreeOpArray() function.
**
** Before returning, *pnOp is set to the number of entries in the returned
................................................................................
  resolveP2Values(p, pnMaxArg);
  *pnOp = p->nOp;
  p->aOp = 0;
  return aOp;
}

/*
** Add a whole list of operations to the operation stack.  Return the
** address of the first operation added.
*/
int sqlite3VdbeAddOpList(Vdbe *p, int nOp, VdbeOpList const *aOp, int iLineno){





  int addr, i;
  VdbeOp *pOut;
  assert( nOp>0 );
  assert( p->magic==VDBE_MAGIC_INIT );
  if( p->nOp + nOp > p->pParse->nOpAlloc && growOpArray(p, nOp) ){
    return 0;
  }
  addr = p->nOp;
  pOut = &p->aOp[addr];
  for(i=0; i<nOp; i++, aOp++, pOut++){
    pOut->opcode = aOp->opcode;
    pOut->p1 = aOp->p1;
    pOut->p2 = aOp->p2;
    assert( aOp->p2>=0 );
    pOut->p3 = aOp->p3;
    pOut->p4type = P4_NOTUSED;
................................................................................
#ifdef SQLITE_VDBE_COVERAGE
    pOut->iSrcLine = iLineno+i;
#else
    (void)iLineno;
#endif
#ifdef SQLITE_DEBUG
    if( p->db->flags & SQLITE_VdbeAddopTrace ){
      sqlite3VdbePrintOp(0, i+addr, &p->aOp[i+addr]);
    }
#endif
  }
  p->nOp += nOp;
  return addr;
}

#if defined(SQLITE_ENABLE_STMT_SCANSTATUS)
/*
** Add an entry to the array of counters managed by sqlite3_stmt_scanstatus().
*/
void sqlite3VdbeScanStatus(
................................................................................
void sqlite3VdbeChangeP2(Vdbe *p, u32 addr, int val){
  sqlite3VdbeGetOp(p,addr)->p2 = val;
}
void sqlite3VdbeChangeP3(Vdbe *p, u32 addr, int val){
  sqlite3VdbeGetOp(p,addr)->p3 = val;
}
void sqlite3VdbeChangeP5(Vdbe *p, u8 p5){
  sqlite3VdbeGetOp(p,-1)->p5 = p5;
}

/*
** Change the P2 operand of instruction addr so that it points to
** the address of the next instruction to be coded.
*/
void sqlite3VdbeJumpHere(Vdbe *p, int addr){
................................................................................
  p->pNext = pVdbe->pProgram;
  pVdbe->pProgram = p;
}

/*
** Change the opcode at addr into OP_Noop
*/
void sqlite3VdbeChangeToNoop(Vdbe *p, int addr){
  if( addr<p->nOp ){


    VdbeOp *pOp = &p->aOp[addr];
    sqlite3 *db = p->db;
    freeP4(db, pOp->p4type, pOp->p4.p);
    memset(pOp, 0, sizeof(pOp[0]));


    pOp->opcode = OP_Noop;
  }

}

/*
** If the last opcode is "op" and it is not a jump destination,
** then remove it.  Return true if and only if an opcode was removed.
*/
int sqlite3VdbeDeletePriorOpcode(Vdbe *p, u8 op){
  if( (p->nOp-1)>(p->pParse->iFixedOp) && p->aOp[p->nOp-1].opcode==op ){
    sqlite3VdbeChangeToNoop(p, p->nOp-1);
    return 1;
  }else{
    return 0;
  }
}

/*
** Change the value of the P4 operand for a specific instruction.
................................................................................
  ** reduce the amount of memory held by a prepared statement.
  */
  do {
    nByte = 0;
    p->aMem = allocSpace(p->aMem, nMem*sizeof(Mem), zCsr, &nFree, &nByte);
    p->aVar = allocSpace(p->aVar, nVar*sizeof(Mem), zCsr, &nFree, &nByte);
    p->apArg = allocSpace(p->apArg, nArg*sizeof(Mem*), zCsr, &nFree, &nByte);
    p->azVar = allocSpace(p->azVar, nVar*sizeof(char*), zCsr, &nFree, &nByte);
    p->apCsr = allocSpace(p->apCsr, nCursor*sizeof(VdbeCursor*),
                          zCsr, &nFree, &nByte);
    p->aOnceFlag = allocSpace(p->aOnceFlag, nOnce, zCsr, &nFree, &nByte);
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
    p->anExec = allocSpace(p->anExec, p->nOp*sizeof(i64), zCsr, &nFree, &nByte);
#endif
    if( nByte ){
................................................................................
  if( p->aVar ){
    p->nVar = (ynVar)nVar;
    for(n=0; n<nVar; n++){
      p->aVar[n].flags = MEM_Null;
      p->aVar[n].db = db;
    }
  }
  if( p->azVar && pParse->nzVar>0 ){
    p->nzVar = pParse->nzVar;
    memcpy(p->azVar, pParse->azVar, p->nzVar*sizeof(p->azVar[0]));
    memset(pParse->azVar, 0, pParse->nzVar*sizeof(pParse->azVar[0]));
  }
  if( p->aMem ){
    p->aMem--;                      /* aMem[] goes from 1..nMem */
    p->nMem = nMem;                 /*       not from 0..nMem-1 */
    for(n=1; n<=nMem; n++){
      p->aMem[n].flags = MEM_Undefined;
      p->aMem[n].db = db;
    }
................................................................................
  releaseMemArray(p->aColName, p->nResColumn*COLNAME_N);
  for(pSub=p->pProgram; pSub; pSub=pNext){
    pNext = pSub->pNext;
    vdbeFreeOpArray(db, pSub->aOp, pSub->nOp);
    sqlite3DbFree(db, pSub);
  }
  for(i=p->nzVar-1; i>=0; i--) sqlite3DbFree(db, p->azVar[i]);

  vdbeFreeOpArray(db, p->aOp, p->nOp);
  sqlite3DbFree(db, p->aColName);
  sqlite3DbFree(db, p->zSql);
  sqlite3DbFree(db, p->pFree);
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
  for(i=0; i<p->nScan; i++){
    sqlite3DbFree(db, p->aScan[i].zName);
................................................................................
    sqlite3VdbeMemShallowCopy(&c1, pMem1, MEM_Ephem);
    sqlite3VdbeMemShallowCopy(&c2, pMem2, MEM_Ephem);
    v1 = sqlite3ValueText((sqlite3_value*)&c1, pColl->enc);
    n1 = v1==0 ? 0 : c1.n;
    v2 = sqlite3ValueText((sqlite3_value*)&c2, pColl->enc);
    n2 = v2==0 ? 0 : c2.n;
    rc = pColl->xCmp(pColl->pUser, n1, v1, n2, v2);

    sqlite3VdbeMemRelease(&c1);
    sqlite3VdbeMemRelease(&c2);
    if( (v1==0 || v2==0) && prcErr ) *prcErr = SQLITE_NOMEM;
    return rc;
  }
}

/*
** Compare two blobs.  Return negative, zero, or positive if the first
** is less than, equal to, or greater than the second, respectively.
................................................................................
#ifndef SQLITE_OMIT_VIRTUALTABLE
/*
** Transfer error message text from an sqlite3_vtab.zErrMsg (text stored
** in memory obtained from sqlite3_malloc) into a Vdbe.zErrMsg (text stored
** in memory obtained from sqlite3DbMalloc).
*/
void sqlite3VtabImportErrmsg(Vdbe *p, sqlite3_vtab *pVtab){

  sqlite3 *db = p->db;
  sqlite3DbFree(db, p->zErrMsg);
  p->zErrMsg = sqlite3DbStrDup(db, pVtab->zErrMsg);
  sqlite3_free(pVtab->zErrMsg);
  pVtab->zErrMsg = 0;
}

#endif /* SQLITE_OMIT_VIRTUALTABLE */

  va_list ap;
  int i;
  char c;
  va_start(ap, zTypes);
  for(i=0; (c = zTypes[i])!=0; i++){
    if( c=='s' ){
      const char *z = va_arg(ap, const char*);
      sqlite3VdbeAddOp4(p, z==0 ? OP_Null : OP_String8, 0, iDest++, 0, z, 0);

    }else{
      assert( c=='i' );
      sqlite3VdbeAddOp2(p, OP_Integer, va_arg(ap, int), iDest++);
    }
  }
  va_end(ap);
}
................................................................................
** Return the address of the next instruction to be inserted.
*/
int sqlite3VdbeCurrentAddr(Vdbe *p){
  assert( p->magic==VDBE_MAGIC_INIT );
  return p->nOp;
}

/*
** Verify that at least N opcode slots are available in p without
** having to malloc for more space (except when compiled using
** SQLITE_TEST_REALLOC_STRESS).  This interface is used during testing
** to verify that certain calls to sqlite3VdbeAddOpList() can never
** fail due to a OOM fault and hence that the return value from
** sqlite3VdbeAddOpList() will always be non-NULL.
*/
#if defined(SQLITE_DEBUG) && !defined(SQLITE_TEST_REALLOC_STRESS)
void sqlite3VdbeVerifyNoMallocRequired(Vdbe *p, int N){
  assert( p->nOp + N <= p->pParse->nOpAlloc );
}
#endif

/*
** This function returns a pointer to the array of opcodes associated with
** the Vdbe passed as the first argument. It is the callers responsibility
** to arrange for the returned array to be eventually freed using the 
** vdbeFreeOpArray() function.
**
** Before returning, *pnOp is set to the number of entries in the returned
................................................................................
  resolveP2Values(p, pnMaxArg);
  *pnOp = p->nOp;
  p->aOp = 0;
  return aOp;
}

/*
** Add a whole list of operations to the operation stack.  Return a
** pointer to the first operation inserted.
*/
VdbeOp *sqlite3VdbeAddOpList(
  Vdbe *p,                     /* Add opcodes to the prepared statement */
  int nOp,                     /* Number of opcodes to add */
  VdbeOpList const *aOp,       /* The opcodes to be added */
  int iLineno                  /* Source-file line number of first opcode */
){
  int i;
  VdbeOp *pOut, *pFirst;
  assert( nOp>0 );
  assert( p->magic==VDBE_MAGIC_INIT );
  if( p->nOp + nOp > p->pParse->nOpAlloc && growOpArray(p, nOp) ){
    return 0;
  }

  pFirst = pOut = &p->aOp[p->nOp];
  for(i=0; i<nOp; i++, aOp++, pOut++){
    pOut->opcode = aOp->opcode;
    pOut->p1 = aOp->p1;
    pOut->p2 = aOp->p2;
    assert( aOp->p2>=0 );
    pOut->p3 = aOp->p3;
    pOut->p4type = P4_NOTUSED;
................................................................................
#ifdef SQLITE_VDBE_COVERAGE
    pOut->iSrcLine = iLineno+i;
#else
    (void)iLineno;
#endif
#ifdef SQLITE_DEBUG
    if( p->db->flags & SQLITE_VdbeAddopTrace ){
      sqlite3VdbePrintOp(0, i+p->nOp, &p->aOp[i+p->nOp]);
    }
#endif
  }
  p->nOp += nOp;
  return pFirst;
}

#if defined(SQLITE_ENABLE_STMT_SCANSTATUS)
/*
** Add an entry to the array of counters managed by sqlite3_stmt_scanstatus().
*/
void sqlite3VdbeScanStatus(
................................................................................
void sqlite3VdbeChangeP2(Vdbe *p, u32 addr, int val){
  sqlite3VdbeGetOp(p,addr)->p2 = val;
}
void sqlite3VdbeChangeP3(Vdbe *p, u32 addr, int val){
  sqlite3VdbeGetOp(p,addr)->p3 = val;
}
void sqlite3VdbeChangeP5(Vdbe *p, u8 p5){
  if( !p->db->mallocFailed ) p->aOp[p->nOp-1].p5 = p5;
}

/*
** Change the P2 operand of instruction addr so that it points to
** the address of the next instruction to be coded.
*/
void sqlite3VdbeJumpHere(Vdbe *p, int addr){
................................................................................
  p->pNext = pVdbe->pProgram;
  pVdbe->pProgram = p;
}

/*
** Change the opcode at addr into OP_Noop
*/
int sqlite3VdbeChangeToNoop(Vdbe *p, int addr){
  VdbeOp *pOp;
  if( p->db->mallocFailed ) return 0;
  assert( addr>=0 && addr<p->nOp );
  pOp = &p->aOp[addr];

  freeP4(p->db, pOp->p4type, pOp->p4.p);

  pOp->p4type = P4_NOTUSED;
  pOp->p4.z = 0;
  pOp->opcode = OP_Noop;

  return 1;
}

/*
** If the last opcode is "op" and it is not a jump destination,
** then remove it.  Return true if and only if an opcode was removed.
*/
int sqlite3VdbeDeletePriorOpcode(Vdbe *p, u8 op){
  if( (p->nOp-1)>(p->pParse->iFixedOp) && p->aOp[p->nOp-1].opcode==op ){
    return sqlite3VdbeChangeToNoop(p, p->nOp-1);

  }else{
    return 0;
  }
}

/*
** Change the value of the P4 operand for a specific instruction.
................................................................................
  ** reduce the amount of memory held by a prepared statement.
  */
  do {
    nByte = 0;
    p->aMem = allocSpace(p->aMem, nMem*sizeof(Mem), zCsr, &nFree, &nByte);
    p->aVar = allocSpace(p->aVar, nVar*sizeof(Mem), zCsr, &nFree, &nByte);
    p->apArg = allocSpace(p->apArg, nArg*sizeof(Mem*), zCsr, &nFree, &nByte);

    p->apCsr = allocSpace(p->apCsr, nCursor*sizeof(VdbeCursor*),
                          zCsr, &nFree, &nByte);
    p->aOnceFlag = allocSpace(p->aOnceFlag, nOnce, zCsr, &nFree, &nByte);
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
    p->anExec = allocSpace(p->anExec, p->nOp*sizeof(i64), zCsr, &nFree, &nByte);
#endif
    if( nByte ){
................................................................................
  if( p->aVar ){
    p->nVar = (ynVar)nVar;
    for(n=0; n<nVar; n++){
      p->aVar[n].flags = MEM_Null;
      p->aVar[n].db = db;
    }
  }
  p->nzVar = pParse->nzVar;
  p->azVar = pParse->azVar;
  pParse->nzVar =  0;
  pParse->azVar = 0;

  if( p->aMem ){
    p->aMem--;                      /* aMem[] goes from 1..nMem */
    p->nMem = nMem;                 /*       not from 0..nMem-1 */
    for(n=1; n<=nMem; n++){
      p->aMem[n].flags = MEM_Undefined;
      p->aMem[n].db = db;
    }
................................................................................
  releaseMemArray(p->aColName, p->nResColumn*COLNAME_N);
  for(pSub=p->pProgram; pSub; pSub=pNext){
    pNext = pSub->pNext;
    vdbeFreeOpArray(db, pSub->aOp, pSub->nOp);
    sqlite3DbFree(db, pSub);
  }
  for(i=p->nzVar-1; i>=0; i--) sqlite3DbFree(db, p->azVar[i]);
  sqlite3DbFree(db, p->azVar);
  vdbeFreeOpArray(db, p->aOp, p->nOp);
  sqlite3DbFree(db, p->aColName);
  sqlite3DbFree(db, p->zSql);
  sqlite3DbFree(db, p->pFree);
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
  for(i=0; i<p->nScan; i++){
    sqlite3DbFree(db, p->aScan[i].zName);
................................................................................
    sqlite3VdbeMemShallowCopy(&c1, pMem1, MEM_Ephem);
    sqlite3VdbeMemShallowCopy(&c2, pMem2, MEM_Ephem);
    v1 = sqlite3ValueText((sqlite3_value*)&c1, pColl->enc);
    n1 = v1==0 ? 0 : c1.n;
    v2 = sqlite3ValueText((sqlite3_value*)&c2, pColl->enc);
    n2 = v2==0 ? 0 : c2.n;
    rc = pColl->xCmp(pColl->pUser, n1, v1, n2, v2);
    if( (v1==0 || v2==0) && prcErr ) *prcErr = SQLITE_NOMEM;
    sqlite3VdbeMemRelease(&c1);
    sqlite3VdbeMemRelease(&c2);

    return rc;
  }
}

/*
** Compare two blobs.  Return negative, zero, or positive if the first
** is less than, equal to, or greater than the second, respectively.
................................................................................
#ifndef SQLITE_OMIT_VIRTUALTABLE
/*
** Transfer error message text from an sqlite3_vtab.zErrMsg (text stored
** in memory obtained from sqlite3_malloc) into a Vdbe.zErrMsg (text stored
** in memory obtained from sqlite3DbMalloc).
*/
void sqlite3VtabImportErrmsg(Vdbe *p, sqlite3_vtab *pVtab){
  if( pVtab->zErrMsg ){
    sqlite3 *db = p->db;
    sqlite3DbFree(db, p->zErrMsg);
    p->zErrMsg = sqlite3DbStrDup(db, pVtab->zErrMsg);
    sqlite3_free(pVtab->zErrMsg);
    pVtab->zErrMsg = 0;
  }
}
#endif /* SQLITE_OMIT_VIRTUALTABLE */

  const char *zColumn,    /* The column containing the blob */
  sqlite_int64 iRow,      /* The row containing the glob */
  int flags,              /* True -> read/write access, false -> read-only */
  sqlite3_blob **ppBlob   /* Handle for accessing the blob returned here */
){
  int nAttempt = 0;
  int iCol;               /* Index of zColumn in row-record */

  /* This VDBE program seeks a btree cursor to the identified 
  ** db/table/row entry. The reason for using a vdbe program instead
  ** of writing code to use the b-tree layer directly is that the
  ** vdbe program will take advantage of the various transaction,
  ** locking and error handling infrastructure built into the vdbe.
  **
  ** After seeking the cursor, the vdbe executes an OP_ResultRow.
  ** Code external to the Vdbe then "borrows" the b-tree cursor and
  ** uses it to implement the blob_read(), blob_write() and 
  ** blob_bytes() functions.
  **
  ** The sqlite3_blob_close() function finalizes the vdbe program,
  ** which closes the b-tree cursor and (possibly) commits the 
  ** transaction.
  */
  static const int iLn = VDBE_OFFSET_LINENO(4);
  static const VdbeOpList openBlob[] = {
    /* {OP_Transaction, 0, 0, 0},  // 0: Inserted separately */
    {OP_TableLock, 0, 0, 0},       /* 1: Acquire a read or write lock */
    /* One of the following two instructions is replaced by an OP_Noop. */
    {OP_OpenRead, 0, 0, 0},        /* 2: Open cursor 0 for reading */
    {OP_OpenWrite, 0, 0, 0},       /* 3: Open cursor 0 for read/write */
    {OP_Variable, 1, 1, 1},        /* 4: Push the rowid to the stack */
    {OP_NotExists, 0, 10, 1},      /* 5: Seek the cursor */
    {OP_Column, 0, 0, 1},          /* 6  */
    {OP_ResultRow, 1, 0, 0},       /* 7  */
    {OP_Goto, 0, 4, 0},            /* 8  */
    {OP_Close, 0, 0, 0},           /* 9  */
    {OP_Halt, 0, 0, 0},            /* 10 */
  };

  int rc = SQLITE_OK;
  char *zErr = 0;
  Table *pTab;
  Parse *pParse = 0;
  Incrblob *pBlob = 0;

#ifdef SQLITE_ENABLE_API_ARMOR
................................................................................
        goto blob_open_out;
      }
    }

    pBlob->pStmt = (sqlite3_stmt *)sqlite3VdbeCreate(pParse);
    assert( pBlob->pStmt || db->mallocFailed );
    if( pBlob->pStmt ){






























      Vdbe *v = (Vdbe *)pBlob->pStmt;
      int iDb = sqlite3SchemaToIndex(db, pTab->pSchema);



      sqlite3VdbeAddOp4Int(v, OP_Transaction, iDb, flags, 
                           pTab->pSchema->schema_cookie,
                           pTab->pSchema->iGeneration);
      sqlite3VdbeChangeP5(v, 1);     
      sqlite3VdbeAddOpList(v, ArraySize(openBlob), openBlob, iLn);

      /* Make sure a mutex is held on the table to be accessed */
      sqlite3VdbeUsesBtree(v, iDb); 



      /* Configure the OP_TableLock instruction */
#ifdef SQLITE_OMIT_SHARED_CACHE
      sqlite3VdbeChangeToNoop(v, 1);

#else
      sqlite3VdbeChangeP1(v, 1, iDb);

      sqlite3VdbeChangeP2(v, 1, pTab->tnum);
      sqlite3VdbeChangeP3(v, 1, flags);

      sqlite3VdbeChangeP4(v, 1, pTab->zName, P4_TRANSIENT);


#endif

      /* Remove either the OP_OpenWrite or OpenRead. Set the P2 
      ** parameter of the other to pTab->tnum.  */
      sqlite3VdbeChangeToNoop(v, 3 - flags);
      sqlite3VdbeChangeP2(v, 2 + flags, pTab->tnum);
      sqlite3VdbeChangeP3(v, 2 + flags, iDb);




      /* Configure the number of columns. Configure the cursor to
      ** think that the table has one more column than it really
      ** does. An OP_Column to retrieve this imaginary column will
      ** always return an SQL NULL. This is useful because it means
      ** we can invoke OP_Column to fill in the vdbe cursors type 
      ** and offset cache without causing any IO.
      */
      sqlite3VdbeChangeP4(v, 2+flags, SQLITE_INT_TO_PTR(pTab->nCol+1),P4_INT32);


      sqlite3VdbeChangeP2(v, 6, pTab->nCol);
      if( !db->mallocFailed ){

        pParse->nVar = 1;
        pParse->nMem = 1;
        pParse->nTab = 1;
        sqlite3VdbeMakeReady(v, pParse);
      }
    }
   

  const char *zColumn,    /* The column containing the blob */
  sqlite_int64 iRow,      /* The row containing the glob */
  int flags,              /* True -> read/write access, false -> read-only */
  sqlite3_blob **ppBlob   /* Handle for accessing the blob returned here */
){
  int nAttempt = 0;
  int iCol;               /* Index of zColumn in row-record */
































  int rc = SQLITE_OK;
  char *zErr = 0;
  Table *pTab;
  Parse *pParse = 0;
  Incrblob *pBlob = 0;

#ifdef SQLITE_ENABLE_API_ARMOR
................................................................................
        goto blob_open_out;
      }
    }

    pBlob->pStmt = (sqlite3_stmt *)sqlite3VdbeCreate(pParse);
    assert( pBlob->pStmt || db->mallocFailed );
    if( pBlob->pStmt ){
      
      /* This VDBE program seeks a btree cursor to the identified 
      ** db/table/row entry. The reason for using a vdbe program instead
      ** of writing code to use the b-tree layer directly is that the
      ** vdbe program will take advantage of the various transaction,
      ** locking and error handling infrastructure built into the vdbe.
      **
      ** After seeking the cursor, the vdbe executes an OP_ResultRow.
      ** Code external to the Vdbe then "borrows" the b-tree cursor and
      ** uses it to implement the blob_read(), blob_write() and 
      ** blob_bytes() functions.
      **
      ** The sqlite3_blob_close() function finalizes the vdbe program,
      ** which closes the b-tree cursor and (possibly) commits the 
      ** transaction.
      */
      static const int iLn = VDBE_OFFSET_LINENO(4);
      static const VdbeOpList openBlob[] = {
                                    /* addr/ofst */
        /* {OP_Transaction, 0, 0, 0},  // 0/   inserted separately */
        {OP_TableLock, 0, 0, 0},       /* 1/0: Acquire a read or write lock */
        {OP_OpenRead, 0, 0, 0},        /* 2/1: Open a cursor */
        {OP_Variable, 1, 1, 0},        /* 3/2: Move ?1 into reg[1] */
        {OP_NotExists, 0, 8, 1},       /* 4/3: Seek the cursor */
        {OP_Column, 0, 0, 1},          /* 5/4  */
        {OP_ResultRow, 1, 0, 0},       /* 6/5  */
        {OP_Goto, 0, 3, 0},            /* 7/6  */
        {OP_Close, 0, 0, 0},           /* 8/7  */
        {OP_Halt, 0, 0, 0},            /* 9/8  */
      };
      Vdbe *v = (Vdbe *)pBlob->pStmt;
      int iDb = sqlite3SchemaToIndex(db, pTab->pSchema);

      VdbeOp *aOp;

      sqlite3VdbeAddOp4Int(v, OP_Transaction, iDb, flags, 
                           pTab->pSchema->schema_cookie,
                           pTab->pSchema->iGeneration);
      sqlite3VdbeChangeP5(v, 1);     
      aOp = sqlite3VdbeAddOpList(v, ArraySize(openBlob), openBlob, iLn);

      /* Make sure a mutex is held on the table to be accessed */
      sqlite3VdbeUsesBtree(v, iDb); 

      if( db->mallocFailed==0 ){
        assert( aOp!=0 );
        /* Configure the OP_TableLock instruction */
#ifdef SQLITE_OMIT_SHARED_CACHE

        aOp[0].opcode = OP_Noop;
#else

        aOp[0].p1 = iDb;
        aOp[0].p2 = pTab->tnum;

        aOp[0].p3 = flags;
        sqlite3VdbeChangeP4(v, 1, pTab->zName, P4_TRANSIENT);
      }
      if( db->mallocFailed==0 ){
#endif

        /* Remove either the OP_OpenWrite or OpenRead. Set the P2 
        ** parameter of the other to pTab->tnum.  */



        if( flags ) aOp[1].opcode = OP_OpenWrite;
        aOp[1].p2 = pTab->tnum;
        aOp[1].p3 = iDb;   

        /* Configure the number of columns. Configure the cursor to
        ** think that the table has one more column than it really
        ** does. An OP_Column to retrieve this imaginary column will
        ** always return an SQL NULL. This is useful because it means
        ** we can invoke OP_Column to fill in the vdbe cursors type 
        ** and offset cache without causing any IO.
        */

        aOp[1].p4type = P4_INT32;
        aOp[1].p4.i = pTab->nCol+1;
        aOp[4].p2 = pTab->nCol;


        pParse->nVar = 1;
        pParse->nMem = 1;
        pParse->nTab = 1;
        sqlite3VdbeMakeReady(v, pParse);
      }
    }
   

    goto value_from_function_out;
  }

  assert( pCtx->pParse->rc==SQLITE_OK );
  memset(&ctx, 0, sizeof(ctx));
  ctx.pOut = pVal;
  ctx.pFunc = pFunc;
  pFunc->xFunc(&ctx, nVal, apVal);
  if( ctx.isError ){
    rc = ctx.isError;
    sqlite3ErrorMsg(pCtx->pParse, "%s", sqlite3_value_text(pVal));
  }else{
    sqlite3ValueApplyAffinity(pVal, aff, SQLITE_UTF8);
    assert( rc==SQLITE_OK );
    rc = sqlite3VdbeChangeEncoding(pVal, enc);

    goto value_from_function_out;
  }

  assert( pCtx->pParse->rc==SQLITE_OK );
  memset(&ctx, 0, sizeof(ctx));
  ctx.pOut = pVal;
  ctx.pFunc = pFunc;
  pFunc->xSFunc(&ctx, nVal, apVal);
  if( ctx.isError ){
    rc = ctx.isError;
    sqlite3ErrorMsg(pCtx->pParse, "%s", sqlite3_value_text(pVal));
  }else{
    sqlite3ValueApplyAffinity(pVal, aff, SQLITE_UTF8);
    assert( rc==SQLITE_OK );
    rc = sqlite3VdbeChangeEncoding(pVal, enc);

  FuncDef *pDef,  /* Function to possibly overload */
  int nArg,       /* Number of arguments to the function */
  Expr *pExpr     /* First argument to the function */
){
  Table *pTab;
  sqlite3_vtab *pVtab;
  sqlite3_module *pMod;
  void (*xFunc)(sqlite3_context*,int,sqlite3_value**) = 0;
  void *pArg = 0;
  FuncDef *pNew;
  int rc = 0;
  char *zLowerName;
  unsigned char *z;


................................................................................
  ** to see if the implementation wants to overload this function 
  */
  zLowerName = sqlite3DbStrDup(db, pDef->zName);
  if( zLowerName ){
    for(z=(unsigned char*)zLowerName; *z; z++){
      *z = sqlite3UpperToLower[*z];
    }
    rc = pMod->xFindFunction(pVtab, nArg, zLowerName, &xFunc, &pArg);
    sqlite3DbFree(db, zLowerName);
  }
  if( rc==0 ){
    return pDef;
  }

  /* Create a new ephemeral function definition for the overloaded
................................................................................
                             + sqlite3Strlen30(pDef->zName) + 1);
  if( pNew==0 ){
    return pDef;
  }
  *pNew = *pDef;
  pNew->zName = (char *)&pNew[1];
  memcpy(pNew->zName, pDef->zName, sqlite3Strlen30(pDef->zName)+1);
  pNew->xFunc = xFunc;
  pNew->pUserData = pArg;
  pNew->funcFlags |= SQLITE_FUNC_EPHEM;
  return pNew;
}

/*
** Make sure virtual table pTab is contained in the pParse->apVirtualLock[]

  FuncDef *pDef,  /* Function to possibly overload */
  int nArg,       /* Number of arguments to the function */
  Expr *pExpr     /* First argument to the function */
){
  Table *pTab;
  sqlite3_vtab *pVtab;
  sqlite3_module *pMod;
  void (*xSFunc)(sqlite3_context*,int,sqlite3_value**) = 0;
  void *pArg = 0;
  FuncDef *pNew;
  int rc = 0;
  char *zLowerName;
  unsigned char *z;


................................................................................
  ** to see if the implementation wants to overload this function 
  */
  zLowerName = sqlite3DbStrDup(db, pDef->zName);
  if( zLowerName ){
    for(z=(unsigned char*)zLowerName; *z; z++){
      *z = sqlite3UpperToLower[*z];
    }
    rc = pMod->xFindFunction(pVtab, nArg, zLowerName, &xSFunc, &pArg);
    sqlite3DbFree(db, zLowerName);
  }
  if( rc==0 ){
    return pDef;
  }

  /* Create a new ephemeral function definition for the overloaded
................................................................................
                             + sqlite3Strlen30(pDef->zName) + 1);
  if( pNew==0 ){
    return pDef;
  }
  *pNew = *pDef;
  pNew->zName = (char *)&pNew[1];
  memcpy(pNew->zName, pDef->zName, sqlite3Strlen30(pDef->zName)+1);
  pNew->xSFunc = xSFunc;
  pNew->pUserData = pArg;
  pNew->funcFlags |= SQLITE_FUNC_EPHEM;
  return pNew;
}

/*
** Make sure virtual table pTab is contained in the pParse->apVirtualLock[]

  }
  while( n>1 && zAff[n-1]==SQLITE_AFF_BLOB ){
    n--;
  }

  /* Code the OP_Affinity opcode if there is anything left to do. */
  if( n>0 ){
    sqlite3VdbeAddOp2(v, OP_Affinity, base, n);
    sqlite3VdbeChangeP4(v, -1, zAff, n);
    sqlite3ExprCacheAffinityChange(pParse, base, n);
  }
}


/*
** Generate code for a single equality term of the WHERE clause.  An equality

  }
  while( n>1 && zAff[n-1]==SQLITE_AFF_BLOB ){
    n--;
  }

  /* Code the OP_Affinity opcode if there is anything left to do. */
  if( n>0 ){
    sqlite3VdbeAddOp4(v, OP_Affinity, base, n, 0, zAff, n);

    sqlite3ExprCacheAffinityChange(pParse, base, n);
  }
}


/*
** Generate code for a single equality term of the WHERE clause.  An equality

  ExprList *pList;           /* List of operands to the LIKE operator */
  int c;                     /* One character in z[] */
  int cnt;                   /* Number of non-wildcard prefix characters */
  char wc[3];                /* Wildcard characters */
  sqlite3 *db = pParse->db;  /* Database connection */
  sqlite3_value *pVal = 0;
  int op;                    /* Opcode of pRight */


  if( !sqlite3IsLikeFunction(db, pExpr, pnoCase, wc) ){
    return 0;
  }
#ifdef SQLITE_EBCDIC
  if( *pnoCase ) return 0;
#endif
................................................................................
        }
      }
    }else{
      z = 0;
    }
  }


  sqlite3ValueFree(pVal);
  return (z!=0);
}
#endif /* SQLITE_OMIT_LIKE_OPTIMIZATION */


#ifndef SQLITE_OMIT_VIRTUALTABLE
/*
** Check to see if the given expression is of the form

  ExprList *pList;           /* List of operands to the LIKE operator */
  int c;                     /* One character in z[] */
  int cnt;                   /* Number of non-wildcard prefix characters */
  char wc[3];                /* Wildcard characters */
  sqlite3 *db = pParse->db;  /* Database connection */
  sqlite3_value *pVal = 0;
  int op;                    /* Opcode of pRight */
  int rc;                    /* Result code to return */

  if( !sqlite3IsLikeFunction(db, pExpr, pnoCase, wc) ){
    return 0;
  }
#ifdef SQLITE_EBCDIC
  if( *pnoCase ) return 0;
#endif
................................................................................
        }
      }
    }else{
      z = 0;
    }
  }

  rc = (z!=0);
  sqlite3ValueFree(pVal);
  return rc;
}
#endif /* SQLITE_OMIT_LIKE_OPTIMIZATION */


#ifndef SQLITE_OMIT_VIRTUALTABLE
/*
** Check to see if the given expression is of the form

*/
static double timelimit = 0.0;

static double currentTime(void){
  double t;
  static sqlite3_vfs *pTimelimitVfs = 0;
  if( pTimelimitVfs==0 ) pTimelimitVfs = sqlite3_vfs_find(0);
  if( pTimelimitVfs->iVersion>=1 && pTimelimitVfs->xCurrentTimeInt64!=0 ){
    sqlite3_int64 tm;
    pTimelimitVfs->xCurrentTimeInt64(pTimelimitVfs, &tm);
    t = tm/86400000.0;
  }else{
    pTimelimitVfs->xCurrentTime(pTimelimitVfs, &t);
  }
  return t;

*/
static double timelimit = 0.0;

static double currentTime(void){
  double t;
  static sqlite3_vfs *pTimelimitVfs = 0;
  if( pTimelimitVfs==0 ) pTimelimitVfs = sqlite3_vfs_find(0);
  if( pTimelimitVfs->iVersion>=2 && pTimelimitVfs->xCurrentTimeInt64!=0 ){
    sqlite3_int64 tm;
    pTimelimitVfs->xCurrentTimeInt64(pTimelimitVfs, &tm);
    t = tm/86400000.0;
  }else{
    pTimelimitVfs->xCurrentTime(pTimelimitVfs, &t);
  }
  return t;