while( *z2 ){ z2++; }
  return 0x3fffffff & (int)(z2 - z);
}

/*
** Generate the file-name for chunk iChunk of the group with base name
** zBase. The file-name is written to buffer zOut before returning. Buffer
** zOut must be allocated by the caller so that it is at least (nBase+4)
** bytes in size, where nBase is the length of zBase, not including the
** nul-terminator.


















*/
static void multiplexFilename(
  const char *zBase,              /* Filename for chunk 0 */
  int nBase,                      /* Size of zBase in bytes (without \0) */
  int flags,                      /* Flags used to open file */
  int iChunk,                     /* Chunk to generate filename for */
  char *zOut                      /* Buffer to write generated name to */
){

  memcpy(zOut, zBase, nBase+1);
  if( iChunk!=0 && iChunk!=SQLITE_MULTIPLEX_JOURNAL_8_3_OFFSET ){
    int n = nBase;
#ifdef SQLITE_ENABLE_8_3_NAMES
    int i;
    for(i=n-1; i>0 && i>=n-4 && zOut[i]!='.'; i--){}
    if( i>=n-4 ) n = i+1;
    if( flags & SQLITE_OPEN_MAIN_JOURNAL ){
      /* The extensions on overflow files for main databases are 001, 002,
       ** 003 and so forth.  To avoid name collisions, add 400 to the 
       ** extensions of journal files so that they are 401, 402, 403, ....
       */
      iChunk += SQLITE_MULTIPLEX_JOURNAL_8_3_OFFSET;
    }
#endif
    sqlite3_snprintf(4,&zOut[n],"%03d",iChunk);

  }



}

/* Compute the filename for the iChunk-th chunk
*/
static int multiplexSubFilename(multiplexGroup *pGroup, int iChunk){
  if( iChunk>=pGroup->nReal ){
    struct multiplexReal *p;
................................................................................
    memset(&p[pGroup->nReal], 0, sizeof(p[0])*(iChunk+1-pGroup->nReal));
    pGroup->aReal = p;
    pGroup->nReal = iChunk+1;
  }
  if( pGroup->zName && pGroup->aReal[iChunk].z==0 ){
    char *z;
    int n = pGroup->nName;
    pGroup->aReal[iChunk].z = z = sqlite3_malloc( n+4 );
    if( z==0 ){
      return SQLITE_NOMEM;
    }
    multiplexFilename(pGroup->zName, pGroup->nName, pGroup->flags, iChunk, z);
  }
  return SQLITE_OK;
}
................................................................................
  rc = pOrigVfs->xDelete(pOrigVfs, zName, syncDir);
  if( rc==SQLITE_OK ){
    /* If the main chunk was deleted successfully, also delete any subsequent
    ** chunks - starting with the last (highest numbered). 
    */
    int nName = strlen(zName);
    char *z;
    z = sqlite3_malloc(nName + 4);
    if( z==0 ){
      rc = SQLITE_IOERR_NOMEM;
    }else{
      int iChunk = 0;
      int bExists;
      do{
        multiplexFilename(zName, nName, SQLITE_OPEN_MAIN_JOURNAL, ++iChunk, z);

  while( *z2 ){ z2++; }
  return 0x3fffffff & (int)(z2 - z);
}

/*
** Generate the file-name for chunk iChunk of the group with base name
** zBase. The file-name is written to buffer zOut before returning. Buffer
** zOut must be allocated by the caller so that it is at least (nBase+5)
** bytes in size, where nBase is the length of zBase, not including the
** nul-terminator.
**
** If iChunk is 0 (or 400 - the number for the first journal file chunk),
** the output is a copy of the input string. Otherwise, if 
** SQLITE_ENABLE_8_3_NAMES is not defined or the input buffer does not contain
** a "." character, then the output is a copy of the input string with the 
** three-digit zero-padded decimal representation if iChunk appended to it. 
** For example:
**
**   zBase="test.db", iChunk=4  ->  zOut="test.db004"
**
** Or, if SQLITE_ENABLE_8_3_NAMES is defined and the input buffer contains
** a "." character, then everything after the "." is replaced by the 
** three-digit representation of iChunk.
**
**   zBase="test.db", iChunk=4  ->  zOut="test.004"
**
** The output buffer string is terminated by 2 0x00 bytes. This makes it safe
** to pass to sqlite3_uri_parameter() and similar.
*/
static void multiplexFilename(
  const char *zBase,              /* Filename for chunk 0 */
  int nBase,                      /* Size of zBase in bytes (without \0) */
  int flags,                      /* Flags used to open file */
  int iChunk,                     /* Chunk to generate filename for */
  char *zOut                      /* Buffer to write generated name to */
){
  int n = nBase;
  memcpy(zOut, zBase, n+1);
  if( iChunk!=0 && iChunk!=SQLITE_MULTIPLEX_JOURNAL_8_3_OFFSET ){

#ifdef SQLITE_ENABLE_8_3_NAMES
    int i;
    for(i=n-1; i>0 && i>=n-4 && zOut[i]!='.'; i--){}
    if( i>=n-4 ) n = i+1;
    if( flags & SQLITE_OPEN_MAIN_JOURNAL ){
      /* The extensions on overflow files for main databases are 001, 002,
       ** 003 and so forth.  To avoid name collisions, add 400 to the 
       ** extensions of journal files so that they are 401, 402, 403, ....
       */
      iChunk += SQLITE_MULTIPLEX_JOURNAL_8_3_OFFSET;
    }
#endif
    sqlite3_snprintf(4,&zOut[n],"%03d",iChunk);
    n += 3;
  }

  assert( zOut[n]=='\0' );
  zOut[n+1] = '\0';
}

/* Compute the filename for the iChunk-th chunk
*/
static int multiplexSubFilename(multiplexGroup *pGroup, int iChunk){
  if( iChunk>=pGroup->nReal ){
    struct multiplexReal *p;
................................................................................
    memset(&p[pGroup->nReal], 0, sizeof(p[0])*(iChunk+1-pGroup->nReal));
    pGroup->aReal = p;
    pGroup->nReal = iChunk+1;
  }
  if( pGroup->zName && pGroup->aReal[iChunk].z==0 ){
    char *z;
    int n = pGroup->nName;
    pGroup->aReal[iChunk].z = z = sqlite3_malloc( n+5 );
    if( z==0 ){
      return SQLITE_NOMEM;
    }
    multiplexFilename(pGroup->zName, pGroup->nName, pGroup->flags, iChunk, z);
  }
  return SQLITE_OK;
}
................................................................................
  rc = pOrigVfs->xDelete(pOrigVfs, zName, syncDir);
  if( rc==SQLITE_OK ){
    /* If the main chunk was deleted successfully, also delete any subsequent
    ** chunks - starting with the last (highest numbered). 
    */
    int nName = strlen(zName);
    char *z;
    z = sqlite3_malloc(nName + 5);
    if( z==0 ){
      rc = SQLITE_IOERR_NOMEM;
    }else{
      int iChunk = 0;
      int bExists;
      do{
        multiplexFilename(zName, nName, SQLITE_OPEN_MAIN_JOURNAL, ++iChunk, z);

  test_set $allquicktests -exclude *malloc* *ioerr* *fault*
]

test_suite "valgrind" -prefix "" -description {
  Run the "veryquick" test suite with a couple of multi-process tests (that
  fail under valgrind) omitted.
} -files [
  test_set $allquicktests -exclude *malloc* *ioerr* *fault*
] -initialize {
  set ::G(valgrind) 1
} -shutdown {
  unset -nocomplain ::G(valgrind)
}

test_suite "quick" -prefix "" -description {

  test_set $allquicktests -exclude *malloc* *ioerr* *fault*
]

test_suite "valgrind" -prefix "" -description {
  Run the "veryquick" test suite with a couple of multi-process tests (that
  fail under valgrind) omitted.
} -files [
  test_set $allquicktests -exclude *malloc* *ioerr* *fault* wal.test
] -initialize {
  set ::G(valgrind) 1
} -shutdown {
  unset -nocomplain ::G(valgrind)
}

test_suite "quick" -prefix "" -description {