SQLite

      ** do loop can not be written:
      **
      **   do {...} while( pRoot->iDocid<iDocid && rc==SQLITE_OK );
      */
      fts3EvalRestart(pCsr, pRoot, &rc);
      do {
        fts3EvalNextRow(pCsr, pRoot, &rc);
        assert_fts3_nc( pRoot->bEof==0 );
        if( pRoot->bEof ) rc = FTS_CORRUPT_VTAB;
      }while( pRoot->iDocid!=iDocid && rc==SQLITE_OK );
    }
  }
  return rc;
}

/*

** A read-only or read-write transaction must be opened before calling
** this function.
**
** Write the number of error seen in *pnErr.  Except for some memory
** allocation errors,  an error message held in memory obtained from
** malloc is returned if *pnErr is non-zero.  If *pnErr==0 then NULL is
** returned.  If a memory allocation error occurs, NULL is returned.
**
** If the first entry in aRoot[] is 0, that indicates that the list of
** root pages is incomplete.  This is a "partial integrity-check".  This
** happens when performing an integrity check on a single table.  The
** zero is skipped, of course.  But in addition, the freelist checks
** and the checks to make sure every page is referenced are also skipped,
** since obviously it is not possible to know which pages are covered by
** the unverified btrees.  Except, if aRoot[1] is 1, then the freelist
** checks are still performed.
*/
char *sqlite3BtreeIntegrityCheck(
  sqlite3 *db,  /* Database connection that is running the check */
  Btree *p,     /* The btree to be checked */
  int *aRoot,   /* An array of root pages numbers for individual trees */
  int nRoot,    /* Number of entries in aRoot[] */
  int mxErr,    /* Stop reporting errors after this many */
  int *pnErr    /* Write number of errors seen to this variable */
){
  Pgno i;
  IntegrityCk sCheck;
  BtShared *pBt = p->pBt;
  u64 savedDbFlags = pBt->db->flags;
  char zErr[100];
  VVA_ONLY( int nRef );
  int bPartial = 0;            /* True if not checking all btrees */
  int bCkFreelist = 1;         /* True to scan the freelist */
  assert( nRoot>0 );

  /* aRoot[0]==0 means this is a partial check */
  if( aRoot[0]==0 ){
    assert( nRoot>1 );
    bPartial = 1;
    if( aRoot[1]!=1 ) bCkFreelist = 0;
  }

  sqlite3BtreeEnter(p);
  assert( p->inTrans>TRANS_NONE && pBt->inTransaction>TRANS_NONE );
  VVA_ONLY( nRef = sqlite3PagerRefcount(pBt->pPager) );
  assert( nRef>=0 );
  sCheck.db = db;
  sCheck.pBt = pBt;

  }

  i = PENDING_BYTE_PAGE(pBt);
  if( i<=sCheck.nPage ) setPageReferenced(&sCheck, i);

  /* Check the integrity of the freelist
  */
  if( bCkFreelist ){
    sCheck.zPfx = "Main freelist: ";
    checkList(&sCheck, 1, get4byte(&pBt->pPage1->aData[32]),
              get4byte(&pBt->pPage1->aData[36]));
    sCheck.zPfx = 0;
  }

  /* Check all the tables.
  */
#ifndef SQLITE_OMIT_AUTOVACUUM
  if( !bPartial ){
    if( pBt->autoVacuum ){
      int mx = 0;
      int mxInHdr;
      for(i=0; (int)i<nRoot; i++) if( mx<aRoot[i] ) mx = aRoot[i];
      mxInHdr = get4byte(&pBt->pPage1->aData[52]);
      if( mx!=mxInHdr ){
        checkAppendMsg(&sCheck,
          "max rootpage (%d) disagrees with header (%d)",
          mx, mxInHdr
        );
      }
    }else if( get4byte(&pBt->pPage1->aData[64])!=0 ){
      checkAppendMsg(&sCheck,
        "incremental_vacuum enabled with a max rootpage of zero"
      );
    }
  }
#endif
  testcase( pBt->db->flags & SQLITE_CellSizeCk );
  pBt->db->flags &= ~(u64)SQLITE_CellSizeCk;
  for(i=0; (int)i<nRoot && sCheck.mxErr; i++){
    i64 notUsed;
    if( aRoot[i]==0 ) continue;
#ifndef SQLITE_OMIT_AUTOVACUUM
    if( pBt->autoVacuum && aRoot[i]>1 && !bPartial ){
      checkPtrmap(&sCheck, aRoot[i], PTRMAP_ROOTPAGE, 0);
    }
#endif
    checkTreePage(&sCheck, aRoot[i], &notUsed, LARGEST_INT64);
  }
  pBt->db->flags = savedDbFlags;

  /* Make sure every page in the file is referenced
  */
  if( !bPartial ){
    for(i=1; i<=sCheck.nPage && sCheck.mxErr; i++){
#ifdef SQLITE_OMIT_AUTOVACUUM
      if( getPageReferenced(&sCheck, i)==0 ){
        checkAppendMsg(&sCheck, "Page %d is never used", i);
      }
#else
      /* If the database supports auto-vacuum, make sure no tables contain
      ** references to pointer-map pages.
      */
      if( getPageReferenced(&sCheck, i)==0 && 
         (PTRMAP_PAGENO(pBt, i)!=i || !pBt->autoVacuum) ){
        checkAppendMsg(&sCheck, "Page %d is never used", i);
      }
      if( getPageReferenced(&sCheck, i)!=0 && 
         (PTRMAP_PAGENO(pBt, i)==i && pBt->autoVacuum) ){
        checkAppendMsg(&sCheck, "Pointer map page %d is referenced", i);
      }
    }
#endif
  }

  /* Clean  up and report errors.
  */
integrity_ck_cleanup:

          sqlite3_snprintf(20, &z[j],"%.16g",x.iJD/86400000.0);
          j+=sqlite3Strlen30(&z[j]);
          break;
        }
        case 'm':  sqlite3_snprintf(3, &z[j],"%02d",x.M); j+=2; break;
        case 'M':  sqlite3_snprintf(3, &z[j],"%02d",x.m); j+=2; break;
        case 's': {

          i64 iS = (i64)(x.iJD/1000 - 21086676*(i64)10000);
          sqlite3Int64ToText(iS, &z[j]);
          j += sqlite3Strlen30(&z[j]);
          break;
        }
        case 'S':  sqlite3_snprintf(3,&z[j],"%02d",(int)x.s); j+=2; break;
        case 'w': {
          z[j++] = (char)(((x.iJD+129600000)/86400000) % 7) + '0';
          break;

  **
  ** Verify the integrity of the database.
  **
  ** The "quick_check" is reduced version of 
  ** integrity_check designed to detect most database corruption
  ** without the overhead of cross-checking indexes.  Quick_check
  ** is linear time wherease integrity_check is O(NlogN).
  **
  ** The maximum nubmer of errors is 100 by default.  A different default
  ** can be specified using a numeric parameter N.
  **
  ** Or, the parameter N can be the name of a table.  In that case, only
  ** the one table named is verified.  The freelist is only verified if
  ** the named table is "sqlite_schema" (or one of its aliases).
  **
  ** All schemas are checked by default.  To check just a single
  ** schema, use the form:
  **
  **      PRAGMA schema.integrity_check;
  */
  case PragTyp_INTEGRITY_CHECK: {
    int i, j, addr, mxErr;
    Table *pObjTab = 0;     /* Check only this one table, if not NULL */

    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.

    /* Initialize the VDBE program */
    pParse->nMem = 6;

    /* Set the maximum error count */
    mxErr = SQLITE_INTEGRITY_CHECK_ERROR_MAX;
    if( zRight ){
      if( sqlite3GetInt32(zRight, &mxErr) ){
        if( mxErr<=0 ){
          mxErr = SQLITE_INTEGRITY_CHECK_ERROR_MAX;
        }
      }else{
        pObjTab = sqlite3LocateTable(pParse, 0, zRight,
                      iDb>=0 ? db->aDb[iDb].zDbSName : 0);
      }
    }
    sqlite3VdbeAddOp2(v, OP_Integer, mxErr-1, 1); /* reg[1] holds errors left */

    /* Do an integrity check on each database file */
    for(i=0; i<db->nDb; i++){
      HashElem *x;     /* For looping over tables in the schema */

      */
      assert( sqlite3SchemaMutexHeld(db, i, 0) );
      pTbls = &db->aDb[i].pSchema->tblHash;
      for(cnt=0, x=sqliteHashFirst(pTbls); x; x=sqliteHashNext(x)){
        Table *pTab = sqliteHashData(x);  /* Current table */
        Index *pIdx;                      /* An index on pTab */
        int nIdx;                         /* Number of indexes on pTab */
        if( pObjTab && pObjTab!=pTab ) continue;
        if( HasRowid(pTab) ) cnt++;
        for(nIdx=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, nIdx++){ cnt++; }
        if( nIdx>mxIdx ) mxIdx = nIdx;
      }
      if( cnt==0 ) continue;
      if( pObjTab ) cnt++;
      aRoot = sqlite3DbMallocRawNN(db, sizeof(int)*(cnt+1));
      if( aRoot==0 ) break;
      cnt = 0;
      if( pObjTab ) aRoot[++cnt] = 0;
      for(x=sqliteHashFirst(pTbls); x; x=sqliteHashNext(x)){
        Table *pTab = sqliteHashData(x);
        Index *pIdx;
        if( pObjTab && pObjTab!=pTab ) continue;
        if( HasRowid(pTab) ) aRoot[++cnt] = pTab->tnum;
        for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
          aRoot[++cnt] = pIdx->tnum;
        }
      }
      aRoot[0] = cnt;

        Index *pIdx, *pPk;
        Index *pPrior = 0;
        int loopTop;
        int iDataCur, iIdxCur;
        int r1 = -1;

        if( pTab->tnum<1 ) continue;  /* Skip VIEWs or VIRTUAL TABLEs */
        if( pObjTab && pObjTab!=pTab ) continue;
        pPk = HasRowid(pTab) ? 0 : sqlite3PrimaryKeyIndex(pTab);
        sqlite3OpenTableAndIndices(pParse, pTab, OP_OpenRead, 0,
                                   1, 0, &iDataCur, &iIdxCur);
        /* reg[7] counts the number of entries in the table.
        ** reg[8+i] counts the number of entries in the i-th index 
        */
        sqlite3VdbeAddOp2(v, OP_Integer, 0, 7);

/*
** Return the index of a column in a table.  Return -1 if the column
** is not contained in the table.
*/
static int columnIndex(Table *pTab, const char *zCol){
  int i;
  u8 h = sqlite3StrIHash(zCol);
  Column *pCol;
  for(pCol=pTab->aCol, i=0; i<pTab->nCol; pCol++, i++){
    if( pCol->hName==h && sqlite3StrICmp(pCol->zName, zCol)==0 ) return i;
  }
  return -1;
}

/*
** Search the first N tables in pSrc, from left to right, looking for a
** table that has a column named zCol.  

        sqlite3ReleaseTempReg(pParse, r2);
      }
      sqlite3ReleaseTempRange(pParse, r1, nPrefixReg+1);
      break;
    }

    case SRT_Upfrom: {

      if( pSort ){
        pushOntoSorter(
            pParse, pSort, p, regResult, regOrig, nResultCol, nPrefixReg);
      }else{


        int i2 = pDest->iSDParm2;
        int r1 = sqlite3GetTempReg(pParse);

        /* If the UPDATE FROM join is an aggregate that matches no rows, it
        ** might still be trying to return one row, because that is what
        ** aggregates do.  Don't record that empty row in the output table. */
        sqlite3VdbeAddOp2(v, OP_IsNull, regResult, iBreak); VdbeCoverage(v);

        sqlite3VdbeAddOp3(v, OP_MakeRecord,
                          regResult+(i2<0), nResultCol-(i2<0), r1);
        if( i2<0 ){
          sqlite3VdbeAddOp3(v, OP_Insert, iParm, r1, regResult);
        }else{
          sqlite3VdbeAddOp4Int(v, OP_IdxInsert, iParm, r1, regResult, i2);
        }
      }
      break;

      break;
    }
    case SRT_Mem: {
      /* The LIMIT clause will terminate the loop for us */
      break;
    }
#endif

    case SRT_Upfrom: {
      int i2 = pDest->iSDParm2;
      int r1 = sqlite3GetTempReg(pParse);
      sqlite3VdbeAddOp3(v, OP_MakeRecord,regRow+(i2<0),nColumn-(i2<0),r1);
      if( i2<0 ){
        sqlite3VdbeAddOp3(v, OP_Insert, iParm, r1, regRow);
      }else{
        sqlite3VdbeAddOp4Int(v, OP_IdxInsert, iParm, r1, regRow, i2);
      }
      break;
    }

    default: {
      assert( eDest==SRT_Output || eDest==SRT_Coroutine ); 
      testcase( eDest==SRT_Output );
      testcase( eDest==SRT_Coroutine );
      if( eDest==SRT_Output ){
        sqlite3VdbeAddOp2(v, OP_ResultRow, pDest->iSdst, nColumn);
      }else{

  int n = 0;
  while( *z ){
    if( (0xc0&*(z++))!=0x80 ) n++;
  }
  return n;
}

/*
** Return true if zFile does not exist or if it is not an ordinary file.
*/
#ifdef _WIN32
# define notNormalFile(X) 0
#else
static int notNormalFile(const char *zFile){
  struct stat x;
  int rc;
  memset(&x, 0, sizeof(x));
  rc = stat(zFile, &x);
  return rc || !S_ISREG(x.st_mode);
}
#endif

/*
** This routine reads a line of text from FILE in, stores
** the text in memory obtained from malloc() and returns a pointer
** to the text.  NULL is returned at end of file, or if malloc()
** fails.
**
** If zLine is not NULL then it is a malloced buffer returned from

    FILE *inSaved = p->in;
    int savedLineno = p->lineno;
    if( nArg!=2 ){
      raw_printf(stderr, "Usage: .read FILE\n");
      rc = 1;
      goto meta_command_exit;
    }
    if( notNormalFile(azArg[1])
     || (p->in = fopen(azArg[1], "rb"))==0
    ){
      utf8_printf(stderr,"Error: cannot open \"%s\"\n", azArg[1]);
      rc = 1;
    }else{
      rc = process_input(p);
      fclose(p->in);
    }
    p->in = inSaved;

void sqlite3FixInit(DbFixer*, Parse*, int, const char*, const Token*);
int sqlite3FixSrcList(DbFixer*, SrcList*);
int sqlite3FixSelect(DbFixer*, Select*);
int sqlite3FixExpr(DbFixer*, Expr*);
int sqlite3FixExprList(DbFixer*, ExprList*);
int sqlite3FixTriggerStep(DbFixer*, TriggerStep*);
int sqlite3RealSameAsInt(double,sqlite3_int64);
void sqlite3Int64ToText(i64,char*);
int sqlite3AtoF(const char *z, double*, int, u8);
int sqlite3GetInt32(const char *, int*);
int sqlite3Atoi(const char*);
#ifndef SQLITE_OMIT_UTF16
int sqlite3Utf16ByteLen(const void *pData, int nChar);
#endif
int sqlite3Utf8CharLen(const char *pData, int nByte);

#else
  return !sqlite3Atoi64(z, pResult, length, enc);
#endif /* SQLITE_OMIT_FLOATING_POINT */
}
#if defined(_MSC_VER)
#pragma warning(default : 4756)
#endif

/*
** Render an signed 64-bit integer as text.  Store the result in zOut[].
**
** The caller must ensure that zOut[] is at least 21 bytes in size.
*/
void sqlite3Int64ToText(i64 v, char *zOut){
  int i;
  u64 x;
  char zTemp[22];
  if( v<0 ){
    x = (v==SMALLEST_INT64) ? ((u64)1)<<63 : -v;
  }else{
    x = v;
  }
  i = sizeof(zTemp)-2;
  zTemp[sizeof(zTemp)-1] = 0;
  do{
    zTemp[i--] = (x%10) + '0';
    x = x/10;
  }while( x );
  if( v<0 ) zTemp[i--] = '-';
  memcpy(zOut, &zTemp[i+1], sizeof(zTemp)-1-i);
}

/*
** Compare the 19-character string zNum against the text representation
** value 2^63:  9223372036854775808.  Return negative, zero, or positive
** if zNum is less than, equal to, or greater than the string.
** Note that zNum must contain exactly 19 characters.
**

/*
** Render a Mem object which is one of MEM_Int, MEM_Real, or MEM_IntReal
** into a buffer.
*/
static void vdbeMemRenderNum(int sz, char *zBuf, Mem *p){
  StrAccum acc;
  assert( p->flags & (MEM_Int|MEM_Real|MEM_IntReal) );
  assert( sz>22 );
  if( p->flags & MEM_Int ){
#if GCC_VERSION>=7000000
    /* Work-around for GCC bug
    ** https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96270 */
    i64 x;
    assert( (p->flags&MEM_Int)*2==sizeof(x) );
    memcpy(&x, (char*)&p->u, (p->flags&MEM_Int)*2);
    sqlite3Int64ToText(x, zBuf);
#else
    sqlite3Int64ToText(p->u.i, zBuf);
#endif
  }else{
    sqlite3StrAccumInit(&acc, 0, zBuf, sz, 0);
    sqlite3_str_appendf(&acc, "%!.15g", 

         (p->flags & MEM_IntReal)!=0 ? (double)p->u.i : p->u.r);
    assert( acc.zText==zBuf && acc.mxAlloc<=0 );
    zBuf[acc.nChar] = 0; /* Fast version of sqlite3StrAccumFinish(&acc) */
  }
}

#ifdef SQLITE_DEBUG
/*
** Validity checks on pMem.  pMem holds a string.
**
** (1) Check that string value of pMem agrees with its integer or real value.

do_catchsql_test 46.2 {
  SELECT * FROM t0
    WHERE t0 MATCH x'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';
} {1 {database disk image is malformed}}

set sqlite_fts3_enable_parentheses $saved

#-------------------------------------------------------------------------
reset_db
do_execsql_test 47.1 {
  CREATE VIRTUAL TABLE t1 USING fts3(a,b,c);
}
do_execsql_test 47.2 {
  INSERT INTO t1_segdir VALUES(0,0,0,0,0,X'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');
  INSERT INTO t1_segdir VALUES(0,1,0,0,0,X'0001300425061b000008323031363036303903250700000134032505000001350325040001073030303030303003251a000008636f6d70696c657203250200000664627374617403250a00010465627567032508000006656e61626c650925090504040404040001087874656e73696f6e03251d0000046674733403250d0003013503250f000003676363032503000106656f706f6c790325110000056a736f6e310325130000046c6f616403251c0000036d6178032518000105656d6f7279032519000304737973350325150000046f6d697403251b000005727472656503251700000a7468726561647361666503251e0000047674616333250b00');
}

do_catchsql_test 47.3 {
  SELECT matchinfo(t1) FROM t1 WHERE t1 MATCH '"json1 enable"';
} {1 {database disk image is malformed}}


finish_test

      }
    } {{row 1 missing from index i2} {row 2 missing from index i2} {wrong # of entries in index i2} {row 1 missing from index i2} {row 2 missing from index i2} {wrong # of entries in index i2}}
    do_test pragma-3.5 {
      execsql {
        PRAGMA integrity_check=4
      }
    } {{row 1 missing from index i2} {row 2 missing from index i2} {wrong # of entries in index i2} {row 1 missing from index i2}}
    do_catchsql_test pragma-3.6 {
      PRAGMA integrity_check=xyz
    } {1 {no such table: xyz}}
    do_catchsql_test pragma-3.6b {
      PRAGMA integrity_check=t2

    } {0 {{row 1 missing from index i2} {row 2 missing from index i2} {wrong # of entries in index i2}}}
    do_catchsql_test pragma-3.6c {
      PRAGMA integrity_check=sqlite_schema
    } {0 ok}
    do_test pragma-3.7 {
      execsql {
        PRAGMA integrity_check=0
      }
    } {{row 1 missing from index i2} {row 2 missing from index i2} {wrong # of entries in index i2} {row 1 missing from index i2} {row 2 missing from index i2} {wrong # of entries in index i2}}
  
    # Add additional corruption by appending unused pages to the end of

    } {ok}
    do_test pragma-3.8.1 {
      execsql {PRAGMA quick_check}
    } {ok}
    do_test pragma-3.8.2 {
      execsql {PRAGMA QUICK_CHECK}
    } {ok}
    do_test pragma-3.9a {
      execsql {
        ATTACH 'testerr.db' AS t2;
        PRAGMA integrity_check
      }
    } {{*** in database t2 ***
Page 4 is never used
Page 5 is never used
Page 6 is never used} {row 1 missing from index i2} {row 2 missing from index i2} {wrong # of entries in index i2}}
    do_execsql_test pragma-3.9b {
      PRAGMA t2.integrity_check=t2;
    } {{row 1 missing from index i2} {row 2 missing from index i2} {wrong # of entries in index i2}}
    do_execsql_test pragma-3.9c {
      PRAGMA t2.integrity_check=sqlite_schema;
    } {ok}
    do_test pragma-3.10 {
      execsql {
        PRAGMA integrity_check=1
      }
    } {{*** in database t2 ***
Page 4 is never used}}
    do_test pragma-3.11 {

  UPDATE t5 SET b=1 FROM t5;
} } } 1

# PG says ERROR:  table name "apples" specified more than once
do_test 2.3.2 { catch { execsql {
  UPDATE t5 AS apples SET b=1 FROM t5 AS apples;
} } } 1

# Problem found by OSSFuzz on 2020-07-20
# https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=24282
#
reset_db
do_execsql_test 3.1 {
  CREATE TABLE t0(a);
  CREATE TABLE t1(b);
  UPDATE t1 SET b=sum(a) FROM t0;
  SELECT * FROM t0, t1;
} {}

finish_test

do_execsql_test 4.1 {
  BEGIN;
    DELETE FROM x1 ORDER BY a LIMIT 2;
    SELECT a FROM x1;
  ROLLBACK;
} {3 4 5 6}

# 2020-06-03: Query planner improved so that a solution is possible.
#
#do_catchsql_test 4.2 {
#  DELETE FROM x1 INDEXED BY x1bc WHERE d=3 LIMIT 1;
#} {1 {no query solution}}

do_execsql_test 4.3 {
  DELETE FROM x1 INDEXED BY x1bc WHERE b=3 LIMIT 1;
  SELECT a FROM x1;
} {1 2 3 4 6}

# 2020-06-03: Query planner improved so that a solution is possible.
#
#do_catchsql_test 4.4 {
#  UPDATE x1 INDEXED BY x1bc SET d=5 WHERE d=3 LIMIT 1;
#} {1 {no query solution}}

do_execsql_test 4.5 {
  UPDATE x1 INDEXED BY x1bc SET d=5 WHERE b=2 LIMIT 1;
  SELECT a, d FROM x1;
} {1 1 2 2 3 5 4 3 6 1}

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