** 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.
**
*************************************************************************
** $Id: btree.c,v 1.299 2006/01/16 15:14:27 danielk1977 Exp $
**
** This file implements a external (disk-based) database using BTrees.
** For a detailed discussion of BTrees, refer to
**
**     Donald E. Knuth, THE ART OF COMPUTER PROGRAMMING, Volume 3:
**     "Sorting And Searching", pages 473-480. Addison-Wesley
**     Publishing Company, Reading, Massachusetts.
................................................................................
#endif
  }
  pBt->usableSize = pBt->pageSize - nReserve;
  assert( (pBt->pageSize & 7)==0 );  /* 8-byte alignment of pageSize */
  sqlite3pager_set_pagesize(pBt->pPager, pBt->pageSize);

#ifndef SQLITE_OMIT_SHARED_CACHE
  /* Add the new btree to the linked list starting at ThreadData.pBtree */




  if( pTsdro->useSharedData && zFilename && !isMemdb ){
    pBt->pNext = pTsdro->pBtree;
    sqlite3ThreadData()->pBtree = pBt;
  }
#endif
  pBt->nRef = 1;
  *ppBtree = p;
................................................................................
  */
  assert( pBt->nRef>0 );
  pBt->nRef--;
  if( pBt->nRef ){
    return SQLITE_OK;
  }

  /* Remove the shared-btree from the thread wide list */



  pTsd = sqlite3ThreadData();
  if( pTsd->pBtree==pBt ){

    pTsd->pBtree = pBt->pNext;
  }else{
    BtShared *pPrev;
    for(pPrev=pTsd->pBtree; pPrev && pPrev->pNext!=pBt; pPrev=pPrev->pNext);
    if( pPrev ){

      pPrev->pNext = pBt->pNext;
    }
  }
#endif

  /* Close the pager and free the shared-btree structure */
  assert( !pBt->pCursor );

** 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.
**
*************************************************************************
** $Id: btree.c,v 1.300 2006/01/18 15:25:17 danielk1977 Exp $
**
** This file implements a external (disk-based) database using BTrees.
** For a detailed discussion of BTrees, refer to
**
**     Donald E. Knuth, THE ART OF COMPUTER PROGRAMMING, Volume 3:
**     "Sorting And Searching", pages 473-480. Addison-Wesley
**     Publishing Company, Reading, Massachusetts.
................................................................................
#endif
  }
  pBt->usableSize = pBt->pageSize - nReserve;
  assert( (pBt->pageSize & 7)==0 );  /* 8-byte alignment of pageSize */
  sqlite3pager_set_pagesize(pBt->pPager, pBt->pageSize);

#ifndef SQLITE_OMIT_SHARED_CACHE
  /* Add the new btree to the linked list starting at ThreadData.pBtree.
  ** There is no chance that a malloc() may fail inside of the 
  ** sqlite3ThreadData() call, as the ThreadData structure must have already
  ** been allocated for pTsdro->useSharedData to be non-zero.
  */
  if( pTsdro->useSharedData && zFilename && !isMemdb ){
    pBt->pNext = pTsdro->pBtree;
    sqlite3ThreadData()->pBtree = pBt;
  }
#endif
  pBt->nRef = 1;
  *ppBtree = p;
................................................................................
  */
  assert( pBt->nRef>0 );
  pBt->nRef--;
  if( pBt->nRef ){
    return SQLITE_OK;
  }

  /* Remove the shared-btree from the thread wide list. Call 
  ** ThreadDataReadOnly() and then cast away the const property of the 
  ** pointer to avoid allocating thread data if it is not really required.
  */
  pTsd = (ThreadData *)sqlite3ThreadDataReadOnly();
  if( pTsd->pBtree==pBt ){
    assert( pTsd==sqlite3ThreadData() );
    pTsd->pBtree = pBt->pNext;
  }else{
    BtShared *pPrev;
    for(pPrev=pTsd->pBtree; pPrev && pPrev->pNext!=pBt; pPrev=pPrev->pNext);
    if( pPrev ){
      assert( pTsd==sqlite3ThreadData() );
      pPrev->pNext = pBt->pNext;
    }
  }
#endif

  /* Close the pager and free the shared-btree structure */
  assert( !pBt->pCursor );

** An tokenizer for SQL
**
** This file contains C code that implements the sqlite3_complete() API.
** This code used to be part of the tokenizer.c source file.  But by
** separating it out, the code will be automatically omitted from
** static links that do not use it.
**
** $Id: complete.c,v 1.2 2005/12/12 06:53:04 danielk1977 Exp $
*/
#include "sqliteInt.h"
#ifndef SQLITE_OMIT_COMPLETE

/*
** This is defined in tokenize.c.  We just have to import the definition.
*/
................................................................................
  int rc = 0;

  pVal = sqlite3ValueNew();
  sqlite3ValueSetStr(pVal, -1, zSql, SQLITE_UTF16NATIVE, SQLITE_STATIC);
  zSql8 = sqlite3ValueText(pVal, SQLITE_UTF8);
  if( zSql8 ){
    rc = sqlite3_complete(zSql8);
  }else if( zSql ){
    rc = SQLITE_NOMEM;
    sqlite3MallocClearFailed();
  }
  sqlite3ValueFree(pVal);
  return rc;
}
#endif /* SQLITE_OMIT_UTF16 */
#endif /* SQLITE_OMIT_COMPLETE */

** An tokenizer for SQL
**
** This file contains C code that implements the sqlite3_complete() API.
** This code used to be part of the tokenizer.c source file.  But by
** separating it out, the code will be automatically omitted from
** static links that do not use it.
**
** $Id: complete.c,v 1.3 2006/01/18 15:25:17 danielk1977 Exp $
*/
#include "sqliteInt.h"
#ifndef SQLITE_OMIT_COMPLETE

/*
** This is defined in tokenize.c.  We just have to import the definition.
*/
................................................................................
  int rc = 0;

  pVal = sqlite3ValueNew();
  sqlite3ValueSetStr(pVal, -1, zSql, SQLITE_UTF16NATIVE, SQLITE_STATIC);
  zSql8 = sqlite3ValueText(pVal, SQLITE_UTF8);
  if( zSql8 ){
    rc = sqlite3_complete(zSql8);



  }
  sqlite3ValueFree(pVal);
  return sqlite3ApiExit(0, rc);
}
#endif /* SQLITE_OMIT_UTF16 */
#endif /* SQLITE_OMIT_COMPLETE */

**
*************************************************************************
** Main file for the SQLite library.  The routines in this file
** implement the programmer interface to the library.  Routines in
** other files are for internal use by SQLite and should not be
** accessed by users of the library.
**
** $Id: legacy.c,v 1.11 2006/01/11 21:41:22 drh Exp $
*/

#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>

/*
................................................................................
    azCols = 0;
  }

exec_out:
  if( pStmt ) sqlite3_finalize(pStmt);
  if( azCols ) sqliteFree(azCols);

  if( sqlite3ThreadDataReadOnly()->mallocFailed ){
    rc = SQLITE_NOMEM;
    sqlite3MallocClearFailed();
  }

  if( rc!=SQLITE_OK && rc==sqlite3_errcode(db) && pzErrMsg ){
    *pzErrMsg = malloc(1+strlen(sqlite3_errmsg(db)));
    if( *pzErrMsg ){
      strcpy(*pzErrMsg, sqlite3_errmsg(db));
    }
  }else if( pzErrMsg ){
    *pzErrMsg = 0;
  }

  return rc;
}

**
*************************************************************************
** Main file for the SQLite library.  The routines in this file
** implement the programmer interface to the library.  Routines in
** other files are for internal use by SQLite and should not be
** accessed by users of the library.
**
** $Id: legacy.c,v 1.12 2006/01/18 15:25:17 danielk1977 Exp $
*/

#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>

/*
................................................................................
    azCols = 0;
  }

exec_out:
  if( pStmt ) sqlite3_finalize(pStmt);
  if( azCols ) sqliteFree(azCols);

  rc = sqlite3ApiExit(0, rc);




  if( rc!=SQLITE_OK && rc==sqlite3_errcode(db) && pzErrMsg ){
    *pzErrMsg = malloc(1+strlen(sqlite3_errmsg(db)));
    if( *pzErrMsg ){
      strcpy(*pzErrMsg, sqlite3_errmsg(db));
    }
  }else if( pzErrMsg ){
    *pzErrMsg = 0;
  }

  return rc;
}

**
*************************************************************************
** Main file for the SQLite library.  The routines in this file
** implement the programmer interface to the library.  Routines in
** other files are for internal use by SQLite and should not be
** accessed by users of the library.
**
** $Id: main.c,v 1.326 2006/01/18 05:51:58 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>

/*
** The following constant value is used by the SQLITE_BIGENDIAN and
................................................................................
  void (*xStep)(sqlite3_context*,int,sqlite3_value **),
  void (*xFinal)(sqlite3_context*)
){
  int rc;
  assert( !sqlite3ThreadDataReadOnly()->mallocFailed );
  rc = sqlite3CreateFunc(db, zFunctionName, nArg, enc, p, xFunc, xStep, xFinal);

  if( sqlite3ThreadDataReadOnly()->mallocFailed ){
    sqlite3MallocClearFailed();
    rc = SQLITE_NOMEM;
    sqlite3Error(db, SQLITE_NOMEM, 0);
  }
  return rc;
}

#ifndef SQLITE_OMIT_UTF16
int sqlite3_create_function16(
  sqlite3 *db,
  const void *zFunctionName,
  int nArg,
................................................................................
  char *zFunc8;
  assert( !sqlite3ThreadDataReadOnly()->mallocFailed );

  zFunc8 = sqlite3utf16to8(zFunctionName, -1);
  rc = sqlite3CreateFunc(db, zFunc8, nArg, eTextRep, p, xFunc, xStep, xFinal);
  sqliteFree(zFunc8);

  if( sqlite3ThreadDataReadOnly()->mallocFailed ){
    sqlite3MallocClearFailed();
    rc = SQLITE_NOMEM;
    sqlite3Error(db, SQLITE_NOMEM, 0);
  }
  return rc;
}
#endif

#ifndef SQLITE_OMIT_TRACE
/*
** Register a trace function.  The pArg from the previously registered trace
** is returned.  
................................................................................
  }
  z = sqlite3_value_text16(db->pErr);
  if( z==0 ){
    sqlite3ValueSetStr(db->pErr, -1, sqlite3ErrStr(db->errCode),
         SQLITE_UTF8, SQLITE_STATIC);
    z = sqlite3_value_text16(db->pErr);
  }
  sqlite3MallocClearFailed();
  return z;
}
#endif /* SQLITE_OMIT_UTF16 */

/*
** Return the most recent error code generated by an SQLite routine. If NULL is
** passed to this function, we assume a malloc() failed during sqlite3_open().
................................................................................
  ** and UTF-16, so add a version for each to avoid any unnecessary
  ** conversions. The only error that can occur here is a malloc() failure.
  */
  if( createCollation(db, "BINARY", SQLITE_UTF8, 0,binCollFunc) ||
      createCollation(db, "BINARY", SQLITE_UTF16, 0,binCollFunc) ||
      (db->pDfltColl = sqlite3FindCollSeq(db, SQLITE_UTF8, "BINARY", 6, 0))==0 
  ){
    /* sqlite3_create_collation() is an external API. So the mallocFailed flag
    ** will have been cleared before returning. So set it explicitly here.
    */
    sqlite3ThreadData()->mallocFailed = 1;
    db->magic = SQLITE_MAGIC_CLOSED;
    goto opendb_out;
  }

  /* Also add a UTF-8 case-insensitive collation sequence. */
  createCollation(db, "NOCASE", SQLITE_UTF8, 0, nocaseCollatingFunc);

................................................................................

opendb_out:
  if( SQLITE_NOMEM==(rc = sqlite3_errcode(db)) ){
    sqlite3_close(db);
    db = 0;
  }
  *ppDb = db;
  sqlite3MallocClearFailed();
  return rc;
}

/*
** Open a new database handle.
*/
int sqlite3_open(
  const char *zFilename, 
................................................................................
** Open a new database handle.
*/
int sqlite3_open16(
  const void *zFilename, 
  sqlite3 **ppDb
){
  char const *zFilename8;   /* zFilename encoded in UTF-8 instead of UTF-16 */
  int rc = SQLITE_NOMEM;
  sqlite3_value *pVal;

  assert( zFilename );
  assert( ppDb );
  *ppDb = 0;
  pVal = sqlite3ValueNew();
  sqlite3ValueSetStr(pVal, -1, zFilename, SQLITE_UTF16NATIVE, SQLITE_STATIC);
................................................................................
    if( rc==SQLITE_OK && *ppDb ){
      rc = sqlite3_exec(*ppDb, "PRAGMA encoding = 'UTF-16'", 0, 0, 0);
      if( rc!=SQLITE_OK ){
        sqlite3_close(*ppDb);
        *ppDb = 0;
      }
    }
  }else{
    assert( sqlite3ThreadDataReadOnly()->mallocFailed );
    sqlite3MallocClearFailed();
  }
  sqlite3ValueFree(pVal);

  return rc;
}
#endif /* SQLITE_OMIT_UTF16 */

/*
** The following routine destroys a virtual machine that is created by
** the sqlite3_compile() routine. The integer returned is an SQLITE_
** success/failure code that describes the result of executing the virtual
................................................................................
  int enc, 
  void* pCtx,
  int(*xCompare)(void*,int,const void*,int,const void*)
){
  int rc;
  assert( !sqlite3ThreadDataReadOnly()->mallocFailed );
  rc = createCollation(db, zName, enc, pCtx, xCompare);
  if( sqlite3ThreadDataReadOnly()->mallocFailed ){
    sqlite3MallocClearFailed();
    rc = SQLITE_NOMEM;
    sqlite3Error(db, rc, 0);
  }
  return rc;
}

#ifndef SQLITE_OMIT_UTF16
/*
** Register a new collation sequence with the database handle db.
*/
int sqlite3_create_collation16(
................................................................................
  char *zName8; 
  assert( !sqlite3ThreadDataReadOnly()->mallocFailed );
  zName8 = sqlite3utf16to8(zName, -1);
  if( zName8 ){
    rc = createCollation(db, zName8, enc, pCtx, xCompare);
    sqliteFree(zName8);
  }
  if( sqlite3ThreadDataReadOnly()->mallocFailed ){
    sqlite3MallocClearFailed();
    rc = SQLITE_NOMEM;
    sqlite3Error(db, rc, 0);
  }
  return rc;
}
#endif /* SQLITE_OMIT_UTF16 */

/*
** Register a collation sequence factory callback with the database handle
** db. Replace any previously installed collation sequence factory.
*/
................................................................................
** current thread.
**
** This routine should only be called when there are no open
** database connections.
*/
int sqlite3_enable_shared_cache(int enable){
  ThreadData *pTd = sqlite3ThreadData();



  
  /* It is only legal to call sqlite3_enable_shared_cache() when there
  ** are no currently open b-trees that were opened by the calling thread.
  ** This condition is only easy to detect if the shared-cache were 
  ** previously enabled (and is being disabled). 
  */
  if( pTd->pBtree && !enable ){
................................................................................

/*
** This is a convenience routine that makes sure that all thread-specific
** data for this thread has been deallocated.
*/
void sqlite3_thread_cleanup(void){
  ThreadData *pTd = sqlite3ThreadData();

  memset(pTd, 0, sizeof(*pTd));

  sqlite3ReleaseThreadData();
}

**
*************************************************************************
** Main file for the SQLite library.  The routines in this file
** implement the programmer interface to the library.  Routines in
** other files are for internal use by SQLite and should not be
** accessed by users of the library.
**
** $Id: main.c,v 1.327 2006/01/18 15:25:17 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>

/*
** The following constant value is used by the SQLITE_BIGENDIAN and
................................................................................
  void (*xStep)(sqlite3_context*,int,sqlite3_value **),
  void (*xFinal)(sqlite3_context*)
){
  int rc;
  assert( !sqlite3ThreadDataReadOnly()->mallocFailed );
  rc = sqlite3CreateFunc(db, zFunctionName, nArg, enc, p, xFunc, xStep, xFinal);

  return sqlite3ApiExit(db, rc);





}

#ifndef SQLITE_OMIT_UTF16
int sqlite3_create_function16(
  sqlite3 *db,
  const void *zFunctionName,
  int nArg,
................................................................................
  char *zFunc8;
  assert( !sqlite3ThreadDataReadOnly()->mallocFailed );

  zFunc8 = sqlite3utf16to8(zFunctionName, -1);
  rc = sqlite3CreateFunc(db, zFunc8, nArg, eTextRep, p, xFunc, xStep, xFinal);
  sqliteFree(zFunc8);

  return sqlite3ApiExit(db, rc);





}
#endif

#ifndef SQLITE_OMIT_TRACE
/*
** Register a trace function.  The pArg from the previously registered trace
** is returned.  
................................................................................
  }
  z = sqlite3_value_text16(db->pErr);
  if( z==0 ){
    sqlite3ValueSetStr(db->pErr, -1, sqlite3ErrStr(db->errCode),
         SQLITE_UTF8, SQLITE_STATIC);
    z = sqlite3_value_text16(db->pErr);
  }
  sqlite3ApiExit(0, 0);
  return z;
}
#endif /* SQLITE_OMIT_UTF16 */

/*
** Return the most recent error code generated by an SQLite routine. If NULL is
** passed to this function, we assume a malloc() failed during sqlite3_open().
................................................................................
  ** and UTF-16, so add a version for each to avoid any unnecessary
  ** conversions. The only error that can occur here is a malloc() failure.
  */
  if( createCollation(db, "BINARY", SQLITE_UTF8, 0,binCollFunc) ||
      createCollation(db, "BINARY", SQLITE_UTF16, 0,binCollFunc) ||
      (db->pDfltColl = sqlite3FindCollSeq(db, SQLITE_UTF8, "BINARY", 6, 0))==0 
  ){



    assert( sqlite3ThreadDataReadOnly()->mallocFailed );
    db->magic = SQLITE_MAGIC_CLOSED;
    goto opendb_out;
  }

  /* Also add a UTF-8 case-insensitive collation sequence. */
  createCollation(db, "NOCASE", SQLITE_UTF8, 0, nocaseCollatingFunc);

................................................................................

opendb_out:
  if( SQLITE_NOMEM==(rc = sqlite3_errcode(db)) ){
    sqlite3_close(db);
    db = 0;
  }
  *ppDb = db;

  return sqlite3ApiExit(0, rc);
}

/*
** Open a new database handle.
*/
int sqlite3_open(
  const char *zFilename, 
................................................................................
** Open a new database handle.
*/
int sqlite3_open16(
  const void *zFilename, 
  sqlite3 **ppDb
){
  char const *zFilename8;   /* zFilename encoded in UTF-8 instead of UTF-16 */
  int rc = SQLITE_OK;
  sqlite3_value *pVal;

  assert( zFilename );
  assert( ppDb );
  *ppDb = 0;
  pVal = sqlite3ValueNew();
  sqlite3ValueSetStr(pVal, -1, zFilename, SQLITE_UTF16NATIVE, SQLITE_STATIC);
................................................................................
    if( rc==SQLITE_OK && *ppDb ){
      rc = sqlite3_exec(*ppDb, "PRAGMA encoding = 'UTF-16'", 0, 0, 0);
      if( rc!=SQLITE_OK ){
        sqlite3_close(*ppDb);
        *ppDb = 0;
      }
    }



  }
  sqlite3ValueFree(pVal);

  return sqlite3ApiExit(0, rc);
}
#endif /* SQLITE_OMIT_UTF16 */

/*
** The following routine destroys a virtual machine that is created by
** the sqlite3_compile() routine. The integer returned is an SQLITE_
** success/failure code that describes the result of executing the virtual
................................................................................
  int enc, 
  void* pCtx,
  int(*xCompare)(void*,int,const void*,int,const void*)
){
  int rc;
  assert( !sqlite3ThreadDataReadOnly()->mallocFailed );
  rc = createCollation(db, zName, enc, pCtx, xCompare);
  return sqlite3ApiExit(db, rc);





}

#ifndef SQLITE_OMIT_UTF16
/*
** Register a new collation sequence with the database handle db.
*/
int sqlite3_create_collation16(
................................................................................
  char *zName8; 
  assert( !sqlite3ThreadDataReadOnly()->mallocFailed );
  zName8 = sqlite3utf16to8(zName, -1);
  if( zName8 ){
    rc = createCollation(db, zName8, enc, pCtx, xCompare);
    sqliteFree(zName8);
  }
  return sqlite3ApiExit(db, rc);





}
#endif /* SQLITE_OMIT_UTF16 */

/*
** Register a collation sequence factory callback with the database handle
** db. Replace any previously installed collation sequence factory.
*/
................................................................................
** current thread.
**
** This routine should only be called when there are no open
** database connections.
*/
int sqlite3_enable_shared_cache(int enable){
  ThreadData *pTd = sqlite3ThreadData();
  if( !pTd ){
    return SQLITE_NOMEM;
  }
  
  /* It is only legal to call sqlite3_enable_shared_cache() when there
  ** are no currently open b-trees that were opened by the calling thread.
  ** This condition is only easy to detect if the shared-cache were 
  ** previously enabled (and is being disabled). 
  */
  if( pTd->pBtree && !enable ){
................................................................................

/*
** This is a convenience routine that makes sure that all thread-specific
** data for this thread has been deallocated.
*/
void sqlite3_thread_cleanup(void){
  ThreadData *pTd = sqlite3ThreadData();
  if( pTd ){
    memset(pTd, 0, sizeof(*pTd));
  }
  sqlite3ReleaseThreadData();
}

# else
#   define TSD_COUNTER(N)  sqlite3_tsd_count += N
# endif
#else
# define TSD_COUNTER(N)  /* no-op */
#endif















/*
** If called with allocateFlag>0, then return a pointer to thread
** specific data for the current thread.  Allocate and zero the
** thread-specific data if it does not already exist.
**
** If called with allocateFlag==0, then check the current thread
................................................................................
    }
    sqlite3OsLeaveMutex();
  }

  pTsd = pthread_getspecific(key);
  if( allocateFlag>0 ){
    if( pTsd==0 ){
      pTsd = sqlite3OsMalloc(sizeof(zeroData));
      if( pTsd ){
        *pTsd = zeroData;
        pthread_setspecific(key, pTsd);
        TSD_COUNTER(+1);
      }
    }
  }else if( pTsd!=0 && allocateFlag<0 
................................................................................
    pTsd = 0;
  }
  return pTsd;
#else
  static ThreadData *pTsd = 0;
  if( allocateFlag>0 ){
    if( pTsd==0 ){
      pTsd = sqlite3OsMalloc( sizeof(zeroData) );
      if( pTsd ){
        *pTsd = zeroData;
        TSD_COUNTER(+1);
      }
    }
  }else if( pTsd!=0 && allocateFlag<0
            && memcmp(pTsd, &zeroData, THREADDATASIZE)==0 ){

# else
#   define TSD_COUNTER(N)  sqlite3_tsd_count += N
# endif
#else
# define TSD_COUNTER(N)  /* no-op */
#endif

#if 0 && defined(SQLITE_MEMDEBUG)
static void *mallocThreadData(size_t nBytes){
  if( sqlite3_iMallocFail>=0 ){
    sqlite3_iMallocFail--;
    if( sqlite3_iMallocFail==0 ){
      return 0;
    }
  }
  return sqlite3OsMalloc(nBytes);
}
#else
  #define mallocThreadData(x) sqlite3OsMalloc(x)
#endif

/*
** If called with allocateFlag>0, then return a pointer to thread
** specific data for the current thread.  Allocate and zero the
** thread-specific data if it does not already exist.
**
** If called with allocateFlag==0, then check the current thread
................................................................................
    }
    sqlite3OsLeaveMutex();
  }

  pTsd = pthread_getspecific(key);
  if( allocateFlag>0 ){
    if( pTsd==0 ){
      pTsd = mallocThreadData(sizeof(zeroData));
      if( pTsd ){
        *pTsd = zeroData;
        pthread_setspecific(key, pTsd);
        TSD_COUNTER(+1);
      }
    }
  }else if( pTsd!=0 && allocateFlag<0 
................................................................................
    pTsd = 0;
  }
  return pTsd;
#else
  static ThreadData *pTsd = 0;
  if( allocateFlag>0 ){
    if( pTsd==0 ){
      pTsd = mallocThreadData( sizeof(zeroData) );
      if( pTsd ){
        *pTsd = zeroData;
        TSD_COUNTER(+1);
      }
    }
  }else if( pTsd!=0 && allocateFlag<0
            && memcmp(pTsd, &zeroData, THREADDATASIZE)==0 ){

** The pager is used to access a database disk file.  It implements
** atomic commit and rollback through the use of a journal file that
** is separate from the database file.  The pager also implements file
** locking to prevent two processes from writing the same database
** file simultaneously, or one process from reading the database while
** another is writing.
**
** @(#) $Id: pager.c,v 1.241 2006/01/16 15:32:23 danielk1977 Exp $
*/
#ifndef SQLITE_OMIT_DISKIO
#include "sqliteInt.h"
#include "os.h"
#include "pager.h"
#include <assert.h>
#include <string.h>
................................................................................
  int tempFile = 0;
  int memDb = 0;
  int readOnly = 0;
  int useJournal = (flags & PAGER_OMIT_JOURNAL)==0;
  int noReadlock = (flags & PAGER_NO_READLOCK)!=0;
  char zTemp[SQLITE_TEMPNAME_SIZE];
#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT







  ThreadData *pTsd = sqlite3ThreadData();

#endif

  /* If malloc() has already failed return SQLITE_NOMEM. Before even
  ** testing for this, set *ppPager to NULL so the caller knows the pager
  ** structure was never allocated. 
  */
  *ppPager = 0;
................................................................................
** is made to roll it back. If an error occurs during the rollback 
** a hot journal may be left in the filesystem but no error is returned
** to the caller.
*/
int sqlite3pager_close(Pager *pPager){
  PgHdr *pPg, *pNext;
#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT





  ThreadData *pTsd = sqlite3ThreadData();

#endif

  switch( pPager->state ){
    case PAGER_RESERVED:
    case PAGER_SYNCED: 
    case PAGER_EXCLUSIVE: {
      /* We ignore any IO errors that occur during the rollback

** The pager is used to access a database disk file.  It implements
** atomic commit and rollback through the use of a journal file that
** is separate from the database file.  The pager also implements file
** locking to prevent two processes from writing the same database
** file simultaneously, or one process from reading the database while
** another is writing.
**
** @(#) $Id: pager.c,v 1.242 2006/01/18 15:25:17 danielk1977 Exp $
*/
#ifndef SQLITE_OMIT_DISKIO
#include "sqliteInt.h"
#include "os.h"
#include "pager.h"
#include <assert.h>
#include <string.h>
................................................................................
  int tempFile = 0;
  int memDb = 0;
  int readOnly = 0;
  int useJournal = (flags & PAGER_OMIT_JOURNAL)==0;
  int noReadlock = (flags & PAGER_NO_READLOCK)!=0;
  char zTemp[SQLITE_TEMPNAME_SIZE];
#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
  /* A malloc() cannot fail in sqlite3ThreadData() as one or more calls to 
  ** malloc() must have already been made by this thread before it gets
  ** to this point. This means the ThreadData must have been allocated already
  ** so that ThreadData.nAlloc can be set. It would be nice to assert
  ** that ThreadData.nAlloc is non-zero, but alas this breaks test cases 
  ** written to invoke the pager directly.
  */
  ThreadData *pTsd = sqlite3ThreadData();
  assert( pTsd );
#endif

  /* If malloc() has already failed return SQLITE_NOMEM. Before even
  ** testing for this, set *ppPager to NULL so the caller knows the pager
  ** structure was never allocated. 
  */
  *ppPager = 0;
................................................................................
** is made to roll it back. If an error occurs during the rollback 
** a hot journal may be left in the filesystem but no error is returned
** to the caller.
*/
int sqlite3pager_close(Pager *pPager){
  PgHdr *pPg, *pNext;
#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
  /* A malloc() cannot fail in sqlite3ThreadData() as one or more calls to 
  ** malloc() must have already been made by this thread before it gets
  ** to this point. This means the ThreadData must have been allocated already
  ** so that ThreadData.nAlloc can be set.
  */
  ThreadData *pTsd = sqlite3ThreadData();
  assert( pTsd && pTsd->nAlloc );
#endif

  switch( pPager->state ){
    case PAGER_RESERVED:
    case PAGER_SYNCED: 
    case PAGER_EXCLUSIVE: {
      /* We ignore any IO errors that occur during the rollback

**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains the implementation of the sqlite3_prepare()
** interface, and routines that contribute to loading the database schema
** from disk.
**
** $Id: prepare.c,v 1.24 2006/01/17 13:21:40 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>

/*
** Fill the InitData structure with an error message that indicates
................................................................................
  if( zErrMsg ){
    sqlite3Error(db, rc, "%s", zErrMsg);
    sqliteFree(zErrMsg);
  }else{
    sqlite3Error(db, rc, 0);
  }

  /* We must check for malloc failure last of all, in case malloc() failed
  ** inside of the sqlite3Error() call above or something.
  */
  if( sParse.pTsd->mallocFailed ){
    rc = SQLITE_NOMEM;
    sqlite3Error(db, rc, 0);
  }

  sParse.pTsd->nRef--;
  sqlite3MallocClearFailed();

  sqlite3ReleaseThreadData();
  return rc;
}

#ifndef SQLITE_OMIT_UTF16
/*
** Compile the UTF-16 encoded SQL statement zSql into a statement handle.
................................................................................
  sqlite3_stmt **ppStmt,    /* OUT: A pointer to the prepared statement */
  const void **pzTail       /* OUT: End of parsed string */
){
  /* This function currently works by first transforming the UTF-16
  ** encoded string to UTF-8, then invoking sqlite3_prepare(). The
  ** tricky bit is figuring out the pointer to return in *pzTail.
  */
  char *zSql8 = 0;
  const char *zTail8 = 0;
  int rc;

  if( sqlite3SafetyCheck(db) ){
    return SQLITE_MISUSE;
  }
  zSql8 = sqlite3utf16to8(zSql, nBytes);
  if( !zSql8 ){
    sqlite3MallocClearFailed();
    sqlite3Error(db, SQLITE_NOMEM, 0);
    return SQLITE_NOMEM;
  }
  rc = sqlite3_prepare(db, zSql8, -1, ppStmt, &zTail8);

  if( zTail8 && pzTail ){
    /* If sqlite3_prepare returns a tail pointer, we calculate the
    ** equivalent pointer into the UTF-16 string by counting the unicode
    ** characters between zSql8 and zTail8, and then returning a pointer
    ** the same number of characters into the UTF-16 string.
    */
    int chars_parsed = sqlite3utf8CharLen(zSql8, zTail8-zSql8);
    *pzTail = (u8 *)zSql + sqlite3utf16ByteLen(zSql, chars_parsed);
  }
  sqliteFree(zSql8); 
  return rc;
}
#endif /* SQLITE_OMIT_UTF16 */

**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains the implementation of the sqlite3_prepare()
** interface, and routines that contribute to loading the database schema
** from disk.
**
** $Id: prepare.c,v 1.25 2006/01/18 15:25:18 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>

/*
** Fill the InitData structure with an error message that indicates
................................................................................
  if( zErrMsg ){
    sqlite3Error(db, rc, "%s", zErrMsg);
    sqliteFree(zErrMsg);
  }else{
    sqlite3Error(db, rc, 0);
  }









  sParse.pTsd->nRef--;

  rc = sqlite3ApiExit(db, rc);
  sqlite3ReleaseThreadData();
  return rc;
}

#ifndef SQLITE_OMIT_UTF16
/*
** Compile the UTF-16 encoded SQL statement zSql into a statement handle.
................................................................................
  sqlite3_stmt **ppStmt,    /* OUT: A pointer to the prepared statement */
  const void **pzTail       /* OUT: End of parsed string */
){
  /* This function currently works by first transforming the UTF-16
  ** encoded string to UTF-8, then invoking sqlite3_prepare(). The
  ** tricky bit is figuring out the pointer to return in *pzTail.
  */
  char *zSql8;
  const char *zTail8 = 0;
  int rc = SQLITE_OK;

  if( sqlite3SafetyCheck(db) ){
    return SQLITE_MISUSE;
  }
  zSql8 = sqlite3utf16to8(zSql, nBytes);
  if( zSql8 ){
    rc = sqlite3_prepare(db, zSql8, -1, ppStmt, &zTail8);


  }


  if( zTail8 && pzTail ){
    /* If sqlite3_prepare returns a tail pointer, we calculate the
    ** equivalent pointer into the UTF-16 string by counting the unicode
    ** characters between zSql8 and zTail8, and then returning a pointer
    ** the same number of characters into the UTF-16 string.
    */
    int chars_parsed = sqlite3utf8CharLen(zSql8, zTail8-zSql8);
    *pzTail = (u8 *)zSql + sqlite3utf16ByteLen(zSql, chars_parsed);
  }
  sqliteFree(zSql8); 
  return sqlite3ApiExit(db, rc);
}
#endif /* SQLITE_OMIT_UTF16 */

**    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.
**
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.472 2006/01/17 16:10:14 danielk1977 Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_

/*
** Extra interface definitions for those who need them
*/
................................................................................
void sqlite3SchemaFree(void *);
Schema *sqlite3SchemaGet(Btree *);
int sqlite3SchemaToIndex(sqlite3 *db, Schema *);
KeyInfo *sqlite3IndexKeyinfo(Parse *, Index *);
int sqlite3CreateFunc(sqlite3 *, const char *, int, int, void *, 
  void (*)(sqlite3_context*,int,sqlite3_value **),
  void (*)(sqlite3_context*,int,sqlite3_value **), void (*)(sqlite3_context*));


#ifndef SQLITE_OMIT_SHARED_CACHE
  void sqlite3TableLock(Parse *, int, int, u8, const char *);
#else
  #define sqlite3TableLock(v,w,x,y,z)
#endif

void sqlite3MallocClearFailed();
#ifdef SQLITE_MEMDEBUG
  void sqlite3MallocDisallow();
  void sqlite3MallocAllow();
#else
  #define sqlite3MallocDisallow()
  #define sqlite3MallocAllow()
#endif

#ifdef SQLITE_SSE
#include "sseInt.h"
#endif

#endif

**    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.
**
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.473 2006/01/18 15:25:18 danielk1977 Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_

/*
** Extra interface definitions for those who need them
*/
................................................................................
void sqlite3SchemaFree(void *);
Schema *sqlite3SchemaGet(Btree *);
int sqlite3SchemaToIndex(sqlite3 *db, Schema *);
KeyInfo *sqlite3IndexKeyinfo(Parse *, Index *);
int sqlite3CreateFunc(sqlite3 *, const char *, int, int, void *, 
  void (*)(sqlite3_context*,int,sqlite3_value **),
  void (*)(sqlite3_context*,int,sqlite3_value **), void (*)(sqlite3_context*));
int sqlite3ApiExit(sqlite3 *db, int);

#ifndef SQLITE_OMIT_SHARED_CACHE
  void sqlite3TableLock(Parse *, int, int, u8, const char *);
#else
  #define sqlite3TableLock(v,w,x,y,z)
#endif


#ifdef SQLITE_MEMDEBUG
  void sqlite3MallocDisallow();
  void sqlite3MallocAllow();
#else
  #define sqlite3MallocDisallow()
  #define sqlite3MallocAllow()
#endif

#ifdef SQLITE_SSE
#include "sseInt.h"
#endif

#endif

**
*************************************************************************
** Utility functions used throughout sqlite.
**
** This file contains functions for allocating memory, comparing
** strings, and stuff like that.
**
** $Id: util.c,v 1.173 2006/01/17 15:36:32 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <stdarg.h>
#include <ctype.h>

/*
................................................................................
** is, then deallocate it. 
*/
void sqlite3ReleaseThreadData(){
  sqlite3OsThreadSpecificData(-1);
}

/*
** Clear the "mallocFailed" flag. This should be invoked before exiting any
** entry points that may have called sqliteMalloc().









*/
void sqlite3MallocClearFailed(){

  ThreadData *pTd = sqlite3OsThreadSpecificData(0);
  if( pTd && pTd->mallocFailed ){
    pTd->mallocFailed = 0;
    sqlite3OsThreadSpecificData(0);

  }



}

#ifdef SQLITE_MEMDEBUG
/*
** This function sets a flag in the thread-specific-data structure that will
** cause an assert to fail if sqliteMalloc() or sqliteRealloc() is called.
*/

**
*************************************************************************
** Utility functions used throughout sqlite.
**
** This file contains functions for allocating memory, comparing
** strings, and stuff like that.
**
** $Id: util.c,v 1.174 2006/01/18 15:25:18 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <stdarg.h>
#include <ctype.h>

/*
................................................................................
** is, then deallocate it. 
*/
void sqlite3ReleaseThreadData(){
  sqlite3OsThreadSpecificData(-1);
}

/*
** This function must be called before exiting any API function (i.e. 
** returning control to the user) that has called sqlite3Malloc or
** sqlite3Realloc.
**
** The returned value is normally a copy of the second argument to this
** function. However, if a malloc() failure has occured since the previous
** invocation SQLITE_NOMEM is returned instead. 
**
** If the first argument, db, is not NULL and a malloc() error has occured,
** then the connection error-code (the value returned by sqlite3_errcode())
** is set to SQLITE_NOMEM.
*/

int sqlite3ApiExit(sqlite3* db, int rc){
  ThreadData *pTd = sqlite3OsThreadSpecificData(0);
  if( pTd && pTd->mallocFailed ){
    pTd->mallocFailed = 0;
    if( db ){
      sqlite3Error(db, SQLITE_NOMEM, 0);
    }
    return SQLITE_NOMEM;
  }
  return rc;
}

#ifdef SQLITE_MEMDEBUG
/*
** This function sets a flag in the thread-specific-data structure that will
** cause an assert to fail if sqliteMalloc() or sqliteRealloc() is called.
*/

    assert( p->aOp[p->nOp-1].p3!=0 );
    assert( p->aOp[p->nOp-1].p3type==P3_DYNAMIC );
    db->xProfile(db->pProfileArg, p->aOp[p->nOp-1].p3, elapseTime);
  }
#endif

  sqlite3Error(p->db, rc, p->zErrMsg ? "%s" : 0, p->zErrMsg);
  sqlite3MallocClearFailed();
  return rc;
}

/*
** Extract the user data from a sqlite3_context structure and return a
** pointer to it.
*/
void *sqlite3_user_data(sqlite3_context *p){
................................................................................
static void columnMallocFailure(sqlite3_stmt *pStmt)
{
  /* If malloc() failed during an encoding conversion within an
  ** sqlite3_column_XXX API, then set the return code of the statement to
  ** SQLITE_NOMEM. The next call to _step() (if any) will return SQLITE_ERROR
  ** and _finalize() will return NOMEM.
  */
  if( sqlite3ThreadDataReadOnly()->mallocFailed ){
    ((Vdbe *)pStmt)->rc = SQLITE_NOMEM;
    sqlite3MallocClearFailed();
  }

}

/**************************** sqlite3_column_  *******************************
** The following routines are used to access elements of the current row
** in the result set.
*/
const void *sqlite3_column_blob(sqlite3_stmt *pStmt, int i){
................................................................................
  }
  N += useType*n;
  ret = xFunc(&p->aColName[N]);

  /* A malloc may have failed inside of the xFunc() call. If this is the case,
  ** clear the mallocFailed flag and return NULL.
  */
  sqlite3MallocClearFailed();
  return ret;
}

/*
** Return the name of the Nth column of the result set returned by SQL
** statement pStmt.
*/
................................................................................
    return rc;
  }
  pVar = &p->aVar[i-1];
  rc = sqlite3VdbeMemSetStr(pVar, zData, nData, encoding, xDel);
  if( rc==SQLITE_OK && encoding!=0 ){
    rc = sqlite3VdbeChangeEncoding(pVar, ENC(p->db));
  }
  sqlite3MallocClearFailed();

  sqlite3Error(((Vdbe *)pStmt)->db, rc, 0);
  return rc;
}


/*
** Bind a blob value to an SQL statement variable.
*/
int sqlite3_bind_blob(

    assert( p->aOp[p->nOp-1].p3!=0 );
    assert( p->aOp[p->nOp-1].p3type==P3_DYNAMIC );
    db->xProfile(db->pProfileArg, p->aOp[p->nOp-1].p3, elapseTime);
  }
#endif

  sqlite3Error(p->db, rc, p->zErrMsg ? "%s" : 0, p->zErrMsg);
  return sqlite3ApiExit(p->db, rc);

}

/*
** Extract the user data from a sqlite3_context structure and return a
** pointer to it.
*/
void *sqlite3_user_data(sqlite3_context *p){
................................................................................
static void columnMallocFailure(sqlite3_stmt *pStmt)
{
  /* If malloc() failed during an encoding conversion within an
  ** sqlite3_column_XXX API, then set the return code of the statement to
  ** SQLITE_NOMEM. The next call to _step() (if any) will return SQLITE_ERROR
  ** and _finalize() will return NOMEM.
  */

  Vdbe *p = (Vdbe *)pStmt;


  p->rc = sqlite3ApiExit(0, p->rc);
}

/**************************** sqlite3_column_  *******************************
** The following routines are used to access elements of the current row
** in the result set.
*/
const void *sqlite3_column_blob(sqlite3_stmt *pStmt, int i){
................................................................................
  }
  N += useType*n;
  ret = xFunc(&p->aColName[N]);

  /* A malloc may have failed inside of the xFunc() call. If this is the case,
  ** clear the mallocFailed flag and return NULL.
  */
  sqlite3ApiExit(0, 0);
  return ret;
}

/*
** Return the name of the Nth column of the result set returned by SQL
** statement pStmt.
*/
................................................................................
    return rc;
  }
  pVar = &p->aVar[i-1];
  rc = sqlite3VdbeMemSetStr(pVar, zData, nData, encoding, xDel);
  if( rc==SQLITE_OK && encoding!=0 ){
    rc = sqlite3VdbeChangeEncoding(pVar, ENC(p->db));
  }


  sqlite3Error(((Vdbe *)pStmt)->db, rc, 0);
  return sqlite3ApiExit(((Vdbe *)pStmt)->db, rc);
}


/*
** Bind a blob value to an SQL statement variable.
*/
int sqlite3_bind_blob(