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Overview
Comment:Add the "PRAGMA cell_size_check=ON" command.
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SHA1:2ead43f074d01312c7642e1df9abccc95547f019
User & Date: drh 2015-05-27 03:46:18
Context
2015-05-27
15:10
Disallow the use of "rowid" in CTEs - it has never worked correctly and it makes no sense, so we might as well make it an explicit error. Also: add the PRAGMA cell_size_check=ON command. check-in: 19e2cebc user: drh tags: trunk
03:46
Add the "PRAGMA cell_size_check=ON" command. Closed-Leaf check-in: 2ead43f0 user: drh tags: cell-size-check-pragma
2015-05-26
20:31
Avoid a buffer overread when comparing against a corrupt record that spans at least one overflow page. check-in: 62a5b363 user: dan tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to Makefile.in.

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test:	$(TESTPROGS) fuzztest
	./testfixture$(TEXE) $(TOP)/test/veryquick.test

# Run a test using valgrind.  This can take a really long time
# because valgrind is so much slower than a native machine.
#
valgrindtest:	$(TESTPROGS) fuzzcheck$(TEXE)
	valgrind -v ./fuzzcheck$(TEXE) $(FUZZDATA)
	OMIT_MISUSE=1 valgrind -v ./testfixture$(TEXE) $(TOP)/test/permutations.test valgrind

# A very fast test that checks basic sanity.  The name comes from
# the 60s-era electronics testing:  "Turn it on and see if smoke
# comes out."
#
smoketest:	$(TESTPROGS) fuzzcheck$(TEXE)







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test:	$(TESTPROGS) fuzztest
	./testfixture$(TEXE) $(TOP)/test/veryquick.test

# Run a test using valgrind.  This can take a really long time
# because valgrind is so much slower than a native machine.
#
valgrindtest:	$(TESTPROGS) fuzzcheck$(TEXE)
	valgrind -v ./fuzzcheck$(TEXE) --cell-size-check $(FUZZDATA)
	OMIT_MISUSE=1 valgrind -v ./testfixture$(TEXE) $(TOP)/test/permutations.test valgrind

# A very fast test that checks basic sanity.  The name comes from
# the 60s-era electronics testing:  "Turn it on and see if smoke
# comes out."
#
smoketest:	$(TESTPROGS) fuzzcheck$(TEXE)

Changes to main.mk.

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test:	$(TESTPROGS) fuzztest
	./testfixture$(EXE) $(TOP)/test/veryquick.test

# Run a test using valgrind.  This can take a really long time
# because valgrind is so much slower than a native machine.
#
valgrindtest:	$(TESTPROGS) fuzzcheck$(EXE) $(FUZZDATA)
	valgrind -v ./fuzzcheck$(EXE) $(FUZZDATA)
	OMIT_MISUSE=1 valgrind -v ./testfixture$(EXE) $(TOP)/test/permutations.test valgrind

# A very fast test that checks basic sanity.  The name comes from
# the 60s-era electronics testing:  "Turn it on and see if smoke
# comes out."
#
smoketest:	$(TESTPROGS) fuzzcheck$(EXE)







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test:	$(TESTPROGS) fuzztest
	./testfixture$(EXE) $(TOP)/test/veryquick.test

# Run a test using valgrind.  This can take a really long time
# because valgrind is so much slower than a native machine.
#
valgrindtest:	$(TESTPROGS) fuzzcheck$(EXE) $(FUZZDATA)
	valgrind -v ./fuzzcheck$(EXE) --cell-size-check $(FUZZDATA)
	OMIT_MISUSE=1 valgrind -v ./testfixture$(EXE) $(TOP)/test/permutations.test valgrind

# A very fast test that checks basic sanity.  The name comes from
# the 60s-era electronics testing:  "Turn it on and see if smoke
# comes out."
#
smoketest:	$(TESTPROGS) fuzzcheck$(EXE)

Changes to src/btree.c.

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  iCellLast = usableSize - 4;
  for(i=0; i<nCell; i++){
    u8 *pAddr;     /* The i-th cell pointer */
    pAddr = &data[cellOffset + i*2];
    pc = get2byte(pAddr);
    testcase( pc==iCellFirst );
    testcase( pc==iCellLast );
#if !defined(SQLITE_ENABLE_OVERSIZE_CELL_CHECK)
    /* These conditions have already been verified in btreeInitPage()
    ** if SQLITE_ENABLE_OVERSIZE_CELL_CHECK is defined 

    */
    if( pc<iCellFirst || pc>iCellLast ){
      return SQLITE_CORRUPT_BKPT;
    }
#endif
    assert( pc>=iCellFirst && pc<=iCellLast );
    size = cellSizePtr(pPage, &src[pc]);
    cbrk -= size;
#if defined(SQLITE_ENABLE_OVERSIZE_CELL_CHECK)
    if( cbrk<iCellFirst ){
      return SQLITE_CORRUPT_BKPT;
    }
#else
    if( cbrk<iCellFirst || pc+size>usableSize ){
      return SQLITE_CORRUPT_BKPT;
    }
#endif
    assert( cbrk+size<=usableSize && cbrk>=iCellFirst );
    testcase( cbrk+size==usableSize );
    testcase( pc+size==usableSize );
    put2byte(pAddr, cbrk);
    if( temp==0 ){
      int x;
      if( cbrk==pc ) continue;
................................................................................
** SQLITE_CORRUPT.  Note that a return of SQLITE_OK does not
** guarantee that the page is well-formed.  It only shows that
** we failed to detect any corruption.
*/
static int btreeInitPage(MemPage *pPage){

  assert( pPage->pBt!=0 );

  assert( sqlite3_mutex_held(pPage->pBt->mutex) );
  assert( pPage->pgno==sqlite3PagerPagenumber(pPage->pDbPage) );
  assert( pPage == sqlite3PagerGetExtra(pPage->pDbPage) );
  assert( pPage->aData == sqlite3PagerGetData(pPage->pDbPage) );

  if( !pPage->isInit ){
    u16 pc;            /* Address of a freeblock within pPage->aData[] */
................................................................................
    **
    ** The following block of code checks early to see if a cell extends
    ** past the end of a page boundary and causes SQLITE_CORRUPT to be 
    ** returned if it does.
    */
    iCellFirst = cellOffset + 2*pPage->nCell;
    iCellLast = usableSize - 4;
#if defined(SQLITE_ENABLE_OVERSIZE_CELL_CHECK)
    {
      int i;            /* Index into the cell pointer array */
      int sz;           /* Size of a cell */

      if( !pPage->leaf ) iCellLast--;
      for(i=0; i<pPage->nCell; i++){
        pc = get2byte(&data[cellOffset+i*2]);
        testcase( pc==iCellFirst );
................................................................................
        testcase( pc+sz==usableSize );
        if( pc+sz>usableSize ){
          return SQLITE_CORRUPT_BKPT;
        }
      }
      if( !pPage->leaf ) iCellLast++;
    }  
#endif

    /* Compute the total free space on the page
    ** EVIDENCE-OF: R-23588-34450 The two-byte integer at offset 1 gives the
    ** start of the first freeblock on the page, or is zero if there are no
    ** freeblocks. */
    pc = get2byte(&data[hdr+1]);
    nFree = data[hdr+7] + top;  /* Init nFree to non-freeblock free space */
................................................................................
          ** fits entirely on the main b-tree page.  */
          testcase( pCell+nCell+2==pPage->aDataEnd );
          c = xRecordCompare(nCell, (void*)&pCell[2], pIdxKey);
        }else{
          /* The record flows over onto one or more overflow pages. In
          ** this case the whole cell needs to be parsed, a buffer allocated
          ** and accessPayload() used to retrieve the record into the
          ** buffer before VdbeRecordCompare() can be called. An extra
          ** byte of zeroed padding is allocated at the end of the buffer,
          ** as this stops the record-compare routines from reading past
          ** the end of the buffer if the record is corrupt.  */
          void *pCellKey;
          u8 * const pCellBody = pCell - pPage->childPtrSize;
          btreeParseCellPtr(pPage, pCellBody, &pCur->info);
          nCell = (int)pCur->info.nKey;
          pCellKey = sqlite3Malloc( nCell+1 );
          if( pCellKey==0 ){
            rc = SQLITE_NOMEM;
            goto moveto_finish;
          }
          pCur->aiIdx[pCur->iPage] = (u16)idx;
          rc = accessPayload(pCur, 0, nCell, (unsigned char*)pCellKey, 2);
          ((unsigned char *)pCellKey)[nCell] = 0;
          if( rc ){
            sqlite3_free(pCellKey);
            goto moveto_finish;
          }
          c = xRecordCompare(nCell, pCellKey, pIdxKey);
          sqlite3_free(pCellKey);
        }







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  iCellLast = usableSize - 4;
  for(i=0; i<nCell; i++){
    u8 *pAddr;     /* The i-th cell pointer */
    pAddr = &data[cellOffset + i*2];
    pc = get2byte(pAddr);
    testcase( pc==iCellFirst );
    testcase( pc==iCellLast );

    /* These conditions have already been verified in btreeInitPage()

    ** if PRAGMA cell_size_check=ON.
    */
    if( pc<iCellFirst || pc>iCellLast ){
      return SQLITE_CORRUPT_BKPT;
    }

    assert( pc>=iCellFirst && pc<=iCellLast );
    size = cellSizePtr(pPage, &src[pc]);
    cbrk -= size;





    if( cbrk<iCellFirst || pc+size>usableSize ){
      return SQLITE_CORRUPT_BKPT;
    }

    assert( cbrk+size<=usableSize && cbrk>=iCellFirst );
    testcase( cbrk+size==usableSize );
    testcase( pc+size==usableSize );
    put2byte(pAddr, cbrk);
    if( temp==0 ){
      int x;
      if( cbrk==pc ) continue;
................................................................................
** SQLITE_CORRUPT.  Note that a return of SQLITE_OK does not
** guarantee that the page is well-formed.  It only shows that
** we failed to detect any corruption.
*/
static int btreeInitPage(MemPage *pPage){

  assert( pPage->pBt!=0 );
  assert( pPage->pBt->db!=0 );
  assert( sqlite3_mutex_held(pPage->pBt->mutex) );
  assert( pPage->pgno==sqlite3PagerPagenumber(pPage->pDbPage) );
  assert( pPage == sqlite3PagerGetExtra(pPage->pDbPage) );
  assert( pPage->aData == sqlite3PagerGetData(pPage->pDbPage) );

  if( !pPage->isInit ){
    u16 pc;            /* Address of a freeblock within pPage->aData[] */
................................................................................
    **
    ** The following block of code checks early to see if a cell extends
    ** past the end of a page boundary and causes SQLITE_CORRUPT to be 
    ** returned if it does.
    */
    iCellFirst = cellOffset + 2*pPage->nCell;
    iCellLast = usableSize - 4;
    if( pBt->db->flags & SQLITE_CellSizeCk ){

      int i;            /* Index into the cell pointer array */
      int sz;           /* Size of a cell */

      if( !pPage->leaf ) iCellLast--;
      for(i=0; i<pPage->nCell; i++){
        pc = get2byte(&data[cellOffset+i*2]);
        testcase( pc==iCellFirst );
................................................................................
        testcase( pc+sz==usableSize );
        if( pc+sz>usableSize ){
          return SQLITE_CORRUPT_BKPT;
        }
      }
      if( !pPage->leaf ) iCellLast++;
    }  


    /* Compute the total free space on the page
    ** EVIDENCE-OF: R-23588-34450 The two-byte integer at offset 1 gives the
    ** start of the first freeblock on the page, or is zero if there are no
    ** freeblocks. */
    pc = get2byte(&data[hdr+1]);
    nFree = data[hdr+7] + top;  /* Init nFree to non-freeblock free space */
................................................................................
          ** fits entirely on the main b-tree page.  */
          testcase( pCell+nCell+2==pPage->aDataEnd );
          c = xRecordCompare(nCell, (void*)&pCell[2], pIdxKey);
        }else{
          /* The record flows over onto one or more overflow pages. In
          ** this case the whole cell needs to be parsed, a buffer allocated
          ** and accessPayload() used to retrieve the record into the
          ** buffer before VdbeRecordCompare() can be called. */



          void *pCellKey;
          u8 * const pCellBody = pCell - pPage->childPtrSize;
          btreeParseCellPtr(pPage, pCellBody, &pCur->info);
          nCell = (int)pCur->info.nKey;
          pCellKey = sqlite3Malloc( nCell );
          if( pCellKey==0 ){
            rc = SQLITE_NOMEM;
            goto moveto_finish;
          }
          pCur->aiIdx[pCur->iPage] = (u16)idx;
          rc = accessPayload(pCur, 0, nCell, (unsigned char*)pCellKey, 2);

          if( rc ){
            sqlite3_free(pCellKey);
            goto moveto_finish;
          }
          c = xRecordCompare(nCell, pCellKey, pIdxKey);
          sqlite3_free(pCellKey);
        }

Changes to src/main.c.

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                 | SQLITE_RecTriggers
#endif
#if defined(SQLITE_DEFAULT_FOREIGN_KEYS) && SQLITE_DEFAULT_FOREIGN_KEYS
                 | SQLITE_ForeignKeys
#endif
#if defined(SQLITE_REVERSE_UNORDERED_SELECTS)
                 | SQLITE_ReverseOrder



#endif
      ;
  sqlite3HashInit(&db->aCollSeq);
#ifndef SQLITE_OMIT_VIRTUALTABLE
  sqlite3HashInit(&db->aModule);
#endif








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                 | SQLITE_RecTriggers
#endif
#if defined(SQLITE_DEFAULT_FOREIGN_KEYS) && SQLITE_DEFAULT_FOREIGN_KEYS
                 | SQLITE_ForeignKeys
#endif
#if defined(SQLITE_REVERSE_UNORDERED_SELECTS)
                 | SQLITE_ReverseOrder
#endif
#if defined(SQLITE_ENABLE_OVERSIZE_CELL_CHECK)
                 | SQLITE_CellSizeCk
#endif
      ;
  sqlite3HashInit(&db->aCollSeq);
#ifndef SQLITE_OMIT_VIRTUALTABLE
  sqlite3HashInit(&db->aModule);
#endif

Changes to src/pragma.h.

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    /* ePragFlag: */ 0,
    /* iArg:      */ SQLITE_CacheSpill },
#endif
  { /* zName:     */ "case_sensitive_like",
    /* ePragTyp:  */ PragTyp_CASE_SENSITIVE_LIKE,
    /* ePragFlag: */ 0,
    /* iArg:      */ 0 },




#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
  { /* zName:     */ "checkpoint_fullfsync",
    /* ePragTyp:  */ PragTyp_FLAG,
    /* ePragFlag: */ 0,
    /* iArg:      */ SQLITE_CkptFullFSync },
#endif
#if !defined(SQLITE_OMIT_SCHEMA_PRAGMAS)
................................................................................
#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
  { /* zName:     */ "writable_schema",
    /* ePragTyp:  */ PragTyp_FLAG,
    /* ePragFlag: */ 0,
    /* iArg:      */ SQLITE_WriteSchema|SQLITE_RecoveryMode },
#endif
};
/* Number of pragmas: 59 on by default, 72 total. */







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    /* ePragFlag: */ 0,
    /* iArg:      */ SQLITE_CacheSpill },
#endif
  { /* zName:     */ "case_sensitive_like",
    /* ePragTyp:  */ PragTyp_CASE_SENSITIVE_LIKE,
    /* ePragFlag: */ 0,
    /* iArg:      */ 0 },
  { /* zName:     */ "cell_size_check",
    /* ePragTyp:  */ PragTyp_FLAG,
    /* ePragFlag: */ 0,
    /* iArg:      */ SQLITE_CellSizeCk },
#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
  { /* zName:     */ "checkpoint_fullfsync",
    /* ePragTyp:  */ PragTyp_FLAG,
    /* ePragFlag: */ 0,
    /* iArg:      */ SQLITE_CkptFullFSync },
#endif
#if !defined(SQLITE_OMIT_SCHEMA_PRAGMAS)
................................................................................
#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
  { /* zName:     */ "writable_schema",
    /* ePragTyp:  */ PragTyp_FLAG,
    /* ePragFlag: */ 0,
    /* iArg:      */ SQLITE_WriteSchema|SQLITE_RecoveryMode },
#endif
};
/* Number of pragmas: 60 on by default, 73 total. */

Changes to src/sqliteInt.h.

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#define SQLITE_PreferBuiltin  0x00200000  /* Preference to built-in funcs */
#define SQLITE_LoadExtension  0x00400000  /* Enable load_extension */
#define SQLITE_EnableTrigger  0x00800000  /* True to enable triggers */
#define SQLITE_DeferFKs       0x01000000  /* Defer all FK constraints */
#define SQLITE_QueryOnly      0x02000000  /* Disable database changes */
#define SQLITE_VdbeEQP        0x04000000  /* Debug EXPLAIN QUERY PLAN */
#define SQLITE_Vacuum         0x08000000  /* Currently in a VACUUM */



/*
** Bits of the sqlite3.dbOptFlags field that are used by the
** sqlite3_test_control(SQLITE_TESTCTRL_OPTIMIZATIONS,...) interface to
** selectively disable various optimizations.
*/







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#define SQLITE_PreferBuiltin  0x00200000  /* Preference to built-in funcs */
#define SQLITE_LoadExtension  0x00400000  /* Enable load_extension */
#define SQLITE_EnableTrigger  0x00800000  /* True to enable triggers */
#define SQLITE_DeferFKs       0x01000000  /* Defer all FK constraints */
#define SQLITE_QueryOnly      0x02000000  /* Disable database changes */
#define SQLITE_VdbeEQP        0x04000000  /* Debug EXPLAIN QUERY PLAN */
#define SQLITE_Vacuum         0x08000000  /* Currently in a VACUUM */
#define SQLITE_CellSizeCk     0x10000000  /* Check btree cell sizes on load */


/*
** Bits of the sqlite3.dbOptFlags field that are used by the
** sqlite3_test_control(SQLITE_TESTCTRL_OPTIMIZATIONS,...) interface to
** selectively disable various optimizations.
*/

Changes to test/fuzzcheck.c.

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*/
static void showHelp(void){
  printf("Usage: %s [options] SOURCE-DB ?ARGS...?\n", g.zArgv0);
  printf(
"Read databases and SQL scripts from SOURCE-DB and execute each script against\n"
"each database, checking for crashes and memory leaks.\n"
"Options:\n"

"  --dbid N              Use only the database where dbid=N\n"
"  --help                Show this help text\n"    
"  -q                    Reduced output\n"
"  --quiet               Reduced output\n"
"  --load-sql ARGS...    Load SQL scripts fro files into SOURCE-DB\n"
"  --load-db ARGS...     Load template databases from files into SOURCE_DB\n"
"  -m TEXT               Add a description to the database\n"
................................................................................
  char *zMsg = 0;              /* Add this message */
  int nSrcDb = 0;              /* Number of source databases */
  char **azSrcDb = 0;          /* Array of source database names */
  int iSrcDb;                  /* Loop over all source databases */
  int nTest = 0;               /* Total number of tests performed */
  char *zDbName = "";          /* Appreviated name of a source database */
  const char *zFailCode = 0;   /* Value of the TEST_FAILURE environment variable */


  iBegin = timeOfDay();
  g.zArgv0 = argv[0];
  zFailCode = getenv("TEST_FAILURE");
  for(i=1; i<argc; i++){
    const char *z = argv[i];
    if( z[0]=='-' ){
      z++;
      if( z[0]=='-' ) z++;



      if( strcmp(z,"dbid")==0 ){
        if( i>=argc-1 ) fatalError("missing arguments on %s", argv[i]);
        onlyDbid = atoi(argv[++i]);
      }else
      if( strcmp(z,"help")==0 ){
        showHelp();
        return 0;
................................................................................
        openFlags = SQLITE_OPEN_CREATE | SQLITE_OPEN_READWRITE;
        if( nativeFlag && pDb->sz==0 ){
          openFlags |= SQLITE_OPEN_MEMORY;
          zVfs = 0;
        }
        rc = sqlite3_open_v2("main.db", &db, openFlags, zVfs);
        if( rc ) fatalError("cannot open inmem database");

        runSql(db, (char*)pSql->a, runFlags);
        sqlite3_close(db);
        if( sqlite3_memory_used()>0 ) fatalError("memory leak");
        reformatVfs();
        nTest++;
        g.zTestName[0] = 0;








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...
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*/
static void showHelp(void){
  printf("Usage: %s [options] SOURCE-DB ?ARGS...?\n", g.zArgv0);
  printf(
"Read databases and SQL scripts from SOURCE-DB and execute each script against\n"
"each database, checking for crashes and memory leaks.\n"
"Options:\n"
"  --cell-size-check     Set the PRAGMA cell_size_check=ON\n"
"  --dbid N              Use only the database where dbid=N\n"
"  --help                Show this help text\n"    
"  -q                    Reduced output\n"
"  --quiet               Reduced output\n"
"  --load-sql ARGS...    Load SQL scripts fro files into SOURCE-DB\n"
"  --load-db ARGS...     Load template databases from files into SOURCE_DB\n"
"  -m TEXT               Add a description to the database\n"
................................................................................
  char *zMsg = 0;              /* Add this message */
  int nSrcDb = 0;              /* Number of source databases */
  char **azSrcDb = 0;          /* Array of source database names */
  int iSrcDb;                  /* Loop over all source databases */
  int nTest = 0;               /* Total number of tests performed */
  char *zDbName = "";          /* Appreviated name of a source database */
  const char *zFailCode = 0;   /* Value of the TEST_FAILURE environment variable */
  int cellSzCkFlag = 0;        /* --cell-size-check */

  iBegin = timeOfDay();
  g.zArgv0 = argv[0];
  zFailCode = getenv("TEST_FAILURE");
  for(i=1; i<argc; i++){
    const char *z = argv[i];
    if( z[0]=='-' ){
      z++;
      if( z[0]=='-' ) z++;
      if( strcmp(z,"cell-size-check")==0 ){
        cellSzCkFlag = 1;
      }else
      if( strcmp(z,"dbid")==0 ){
        if( i>=argc-1 ) fatalError("missing arguments on %s", argv[i]);
        onlyDbid = atoi(argv[++i]);
      }else
      if( strcmp(z,"help")==0 ){
        showHelp();
        return 0;
................................................................................
        openFlags = SQLITE_OPEN_CREATE | SQLITE_OPEN_READWRITE;
        if( nativeFlag && pDb->sz==0 ){
          openFlags |= SQLITE_OPEN_MEMORY;
          zVfs = 0;
        }
        rc = sqlite3_open_v2("main.db", &db, openFlags, zVfs);
        if( rc ) fatalError("cannot open inmem database");
        if( cellSzCkFlag ) runSql(db, "PRAGMA cell_size_check=ON", runFlags);
        runSql(db, (char*)pSql->a, runFlags);
        sqlite3_close(db);
        if( sqlite3_memory_used()>0 ) fatalError("memory leak");
        reformatVfs();
        nTest++;
        g.zTestName[0] = 0;

Changes to tool/mkpragmatab.tcl.

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  NAME: defer_foreign_keys
  TYPE: FLAG
  ARG:  SQLITE_DeferFKs
  IF:   !defined(SQLITE_OMIT_FLAG_PRAGMAS)
  IF:   !defined(SQLITE_OMIT_FOREIGN_KEY) && !defined(SQLITE_OMIT_TRIGGER)





  NAME: default_cache_size
  FLAG: NeedSchema
  IF:   !defined(SQLITE_OMIT_PAGER_PRAGMAS) && !defined(SQLITE_OMIT_DEPRECATED)

  NAME: page_size
  IF:   !defined(SQLITE_OMIT_PAGER_PRAGMAS)








>
>
>
>







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  NAME: defer_foreign_keys
  TYPE: FLAG
  ARG:  SQLITE_DeferFKs
  IF:   !defined(SQLITE_OMIT_FLAG_PRAGMAS)
  IF:   !defined(SQLITE_OMIT_FOREIGN_KEY) && !defined(SQLITE_OMIT_TRIGGER)

  NAME: cell_size_check
  TYPE: FLAG
  ARG:  SQLITE_CellSizeCk

  NAME: default_cache_size
  FLAG: NeedSchema
  IF:   !defined(SQLITE_OMIT_PAGER_PRAGMAS) && !defined(SQLITE_OMIT_DEPRECATED)

  NAME: page_size
  IF:   !defined(SQLITE_OMIT_PAGER_PRAGMAS)