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Overview
Comment:Change the OP_JournalMode implementation so that it works even if a substitute sqlite3PagerFilename() that might return NULL is used.
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SHA1: 491ff5fb2504173d6905e38b8ea35737338aaa84
User & Date: drh 2011-10-17 23:15:31.767
Context
2011-10-18
12:44
Fix a floating-point exception that can occur when an FTS4 query contains a large number of tokens connected by AND or NEAR operators. (check-in: 3126754c72 user: dan tags: trunk)
2011-10-17
23:15
Change the OP_JournalMode implementation so that it works even if a substitute sqlite3PagerFilename() that might return NULL is used. (check-in: 491ff5fb25 user: drh tags: trunk)
20:41
Avoid 32-bit integer overflow when evaluating the exponent of a floating point value during ascii to binary conversion. (check-in: 4becc47eb4 user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/vdbe.c.
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#ifndef SQLITE_OMIT_WAL
  zFilename = sqlite3PagerFilename(pPager);

  /* Do not allow a transition to journal_mode=WAL for a database
  ** in temporary storage or if the VFS does not support shared memory 
  */
  if( eNew==PAGER_JOURNALMODE_WAL
   && (zFilename[0]==0                         /* Temp file */
       || !sqlite3PagerWalSupported(pPager))   /* No shared-memory support */
  ){
    eNew = eOld;
  }

  if( (eNew!=eOld)
   && (eOld==PAGER_JOURNALMODE_WAL || eNew==PAGER_JOURNALMODE_WAL)








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5463
5464
5465
5466
5467
5468
5469
5470
5471
5472
5473
5474
5475
5476
5477

#ifndef SQLITE_OMIT_WAL
  zFilename = sqlite3PagerFilename(pPager);

  /* Do not allow a transition to journal_mode=WAL for a database
  ** in temporary storage or if the VFS does not support shared memory 
  */
  if( eNew==PAGER_JOURNALMODE_WAL
   && (sqlite3Strlen30(zFilename)==0           /* Temp file */
       || !sqlite3PagerWalSupported(pPager))   /* No shared-memory support */
  ){
    eNew = eOld;
  }

  if( (eNew!=eOld)
   && (eOld==PAGER_JOURNALMODE_WAL || eNew==PAGER_JOURNALMODE_WAL)
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