Move bundled copy of sqlite one level deeper to better separate it...

third_party/sqlite/src/prepare.c

Index: third_party/sqlite/src/prepare.c
===================================================================
--- third_party/sqlite/src/prepare.c	(revision 56608)
+++ third_party/sqlite/src/prepare.c	(working copy)
@@ -1,870 +0,0 @@
-/*
-** 2005 May 25
-**
-** The author disclaims copyright to this source code.  In place of
-** 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.
-**
-*************************************************************************
-** 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 1.131 2009/08/06 17:43:31 drh Exp $
-*/
-#include "sqliteInt.h"
-
-/*
-** Fill the InitData structure with an error message that indicates
-** that the database is corrupt.
-*/
-static void corruptSchema(
-  InitData *pData,     /* Initialization context */
-  const char *zObj,    /* Object being parsed at the point of error */
-  const char *zExtra   /* Error information */
-){
-  sqlite3 *db = pData->db;
-  if( !db->mallocFailed && (db->flags & SQLITE_RecoveryMode)==0 ){
-    if( zObj==0 ) zObj = "?";
-    sqlite3SetString(pData->pzErrMsg, db,
-      "malformed database schema (%s)", zObj);
-    if( zExtra ){
-      *pData->pzErrMsg = sqlite3MAppendf(db, *pData->pzErrMsg, 
-                                 "%s - %s", *pData->pzErrMsg, zExtra);
-    }
-  }
-  pData->rc = db->mallocFailed ? SQLITE_NOMEM : SQLITE_CORRUPT;
-}
-
-/*
-** This is the callback routine for the code that initializes the
-** database.  See sqlite3Init() below for additional information.
-** This routine is also called from the OP_ParseSchema opcode of the VDBE.
-**
-** Each callback contains the following information:
-**
-**     argv[0] = name of thing being created
-**     argv[1] = root page number for table or index. 0 for trigger or view.
-**     argv[2] = SQL text for the CREATE statement.
-**
-*/
-int sqlite3InitCallback(void *pInit, int argc, char **argv, char **NotUsed){
-  InitData *pData = (InitData*)pInit;
-  sqlite3 *db = pData->db;
-  int iDb = pData->iDb;
-
-  assert( argc==3 );
-  UNUSED_PARAMETER2(NotUsed, argc);
-  assert( sqlite3_mutex_held(db->mutex) );
-  DbClearProperty(db, iDb, DB_Empty);
-  if( db->mallocFailed ){
-    corruptSchema(pData, argv[0], 0);
-    return 1;
-  }
-
-  assert( iDb>=0 && iDb<db->nDb );
-  if( argv==0 ) return 0;   /* Might happen if EMPTY_RESULT_CALLBACKS are on */
-  if( argv[1]==0 ){
-    corruptSchema(pData, argv[0], 0);
-  }else if( argv[2] && argv[2][0] ){
-    /* Call the parser to process a CREATE TABLE, INDEX or VIEW.
-    ** But because db->init.busy is set to 1, no VDBE code is generated
-    ** or executed.  All the parser does is build the internal data
-    ** structures that describe the table, index, or view.
-    */
-    char *zErr;
-    int rc;
-    assert( db->init.busy );
-    db->init.iDb = iDb;
-    db->init.newTnum = atoi(argv[1]);
-    db->init.orphanTrigger = 0;
-    rc = sqlite3_exec(db, argv[2], 0, 0, &zErr);
-    db->init.iDb = 0;
-    assert( rc!=SQLITE_OK || zErr==0 );
-    if( SQLITE_OK!=rc ){
-      if( db->init.orphanTrigger ){
-        assert( iDb==1 );
-      }else{
-        pData->rc = rc;
-        if( rc==SQLITE_NOMEM ){
-          db->mallocFailed = 1;
-        }else if( rc!=SQLITE_INTERRUPT && rc!=SQLITE_LOCKED ){
-          corruptSchema(pData, argv[0], zErr);
-        }
-      }
-      sqlite3DbFree(db, zErr);
-    }
-  }else if( argv[0]==0 ){
-    corruptSchema(pData, 0, 0);
-  }else{
-    /* If the SQL column is blank it means this is an index that
-    ** was created to be the PRIMARY KEY or to fulfill a UNIQUE
-    ** constraint for a CREATE TABLE.  The index should have already
-    ** been created when we processed the CREATE TABLE.  All we have
-    ** to do here is record the root page number for that index.
-    */
-    Index *pIndex;
-    pIndex = sqlite3FindIndex(db, argv[0], db->aDb[iDb].zName);
-    if( pIndex==0 ){
-      /* This can occur if there exists an index on a TEMP table which
-      ** has the same name as another index on a permanent index.  Since
-      ** the permanent table is hidden by the TEMP table, we can also
-      ** safely ignore the index on the permanent table.
-      */
-      /* Do Nothing */;
-    }else if( sqlite3GetInt32(argv[1], &pIndex->tnum)==0 ){
-      corruptSchema(pData, argv[0], "invalid rootpage");
-    }
-  }
-  return 0;
-}
-
-/*
-** Attempt to read the database schema and initialize internal
-** data structures for a single database file.  The index of the
-** database file is given by iDb.  iDb==0 is used for the main
-** database.  iDb==1 should never be used.  iDb>=2 is used for
-** auxiliary databases.  Return one of the SQLITE_ error codes to
-** indicate success or failure.
-*/
-static int sqlite3InitOne(sqlite3 *db, int iDb, char **pzErrMsg){
-  int rc;
-  int i;
-  int size;
-  Table *pTab;
-  Db *pDb;
-  char const *azArg[4];
-  int meta[5];
-  InitData initData;
-  char const *zMasterSchema;
-  char const *zMasterName = SCHEMA_TABLE(iDb);
-  int openedTransaction = 0;
-
-  /*
-  ** The master database table has a structure like this
-  */
-  static const char master_schema[] = 
-     "CREATE TABLE sqlite_master(\n"
-     "  type text,\n"
-     "  name text,\n"
-     "  tbl_name text,\n"
-     "  rootpage integer,\n"
-     "  sql text\n"
-     ")"
-  ;
-#ifndef SQLITE_OMIT_TEMPDB
-  static const char temp_master_schema[] = 
-     "CREATE TEMP TABLE sqlite_temp_master(\n"
-     "  type text,\n"
-     "  name text,\n"
-     "  tbl_name text,\n"
-     "  rootpage integer,\n"
-     "  sql text\n"
-     ")"
-  ;
-#else
-  #define temp_master_schema 0
-#endif
-
-  assert( iDb>=0 && iDb<db->nDb );
-  assert( db->aDb[iDb].pSchema );
-  assert( sqlite3_mutex_held(db->mutex) );
-  assert( iDb==1 || sqlite3BtreeHoldsMutex(db->aDb[iDb].pBt) );
-
-  /* zMasterSchema and zInitScript are set to point at the master schema
-  ** and initialisation script appropriate for the database being
-  ** initialised. zMasterName is the name of the master table.
-  */
-  if( !OMIT_TEMPDB && iDb==1 ){
-    zMasterSchema = temp_master_schema;
-  }else{
-    zMasterSchema = master_schema;
-  }
-  zMasterName = SCHEMA_TABLE(iDb);
-
-  /* Construct the schema tables.  */
-  azArg[0] = zMasterName;
-  azArg[1] = "1";
-  azArg[2] = zMasterSchema;
-  azArg[3] = 0;
-  initData.db = db;
-  initData.iDb = iDb;
-  initData.rc = SQLITE_OK;
-  initData.pzErrMsg = pzErrMsg;
-  (void)sqlite3SafetyOff(db);
-  sqlite3InitCallback(&initData, 3, (char **)azArg, 0);
-  (void)sqlite3SafetyOn(db);
-  if( initData.rc ){
-    rc = initData.rc;
-    goto error_out;
-  }
-  pTab = sqlite3FindTable(db, zMasterName, db->aDb[iDb].zName);
-  if( ALWAYS(pTab) ){
-    pTab->tabFlags |= TF_Readonly;
-  }
-
-  /* Create a cursor to hold the database open
-  */
-  pDb = &db->aDb[iDb];
-  if( pDb->pBt==0 ){
-    if( !OMIT_TEMPDB && ALWAYS(iDb==1) ){
-      DbSetProperty(db, 1, DB_SchemaLoaded);
-    }
-    return SQLITE_OK;
-  }
-
-  /* If there is not already a read-only (or read-write) transaction opened
-  ** on the b-tree database, open one now. If a transaction is opened, it 
-  ** will be closed before this function returns.  */
-  sqlite3BtreeEnter(pDb->pBt);
-  if( !sqlite3BtreeIsInReadTrans(pDb->pBt) ){
-    rc = sqlite3BtreeBeginTrans(pDb->pBt, 0);
-    if( rc!=SQLITE_OK ){
-      sqlite3SetString(pzErrMsg, db, "%s", sqlite3ErrStr(rc));
-      goto initone_error_out;
-    }
-    openedTransaction = 1;
-  }
-
-  /* Get the database meta information.
-  **
-  ** Meta values are as follows:
-  **    meta[0]   Schema cookie.  Changes with each schema change.
-  **    meta[1]   File format of schema layer.
-  **    meta[2]   Size of the page cache.
-  **    meta[3]   Largest rootpage (auto/incr_vacuum mode)
-  **    meta[4]   Db text encoding. 1:UTF-8 2:UTF-16LE 3:UTF-16BE
-  **    meta[5]   User version
-  **    meta[6]   Incremental vacuum mode
-  **    meta[7]   unused
-  **    meta[8]   unused
-  **    meta[9]   unused
-  **
-  ** Note: The #defined SQLITE_UTF* symbols in sqliteInt.h correspond to
-  ** the possible values of meta[4].
-  */
-  for(i=0; i<ArraySize(meta); i++){
-    sqlite3BtreeGetMeta(pDb->pBt, i+1, (u32 *)&meta[i]);
-  }
-  pDb->pSchema->schema_cookie = meta[BTREE_SCHEMA_VERSION-1];
-
-  /* If opening a non-empty database, check the text encoding. For the
-  ** main database, set sqlite3.enc to the encoding of the main database.
-  ** For an attached db, it is an error if the encoding is not the same
-  ** as sqlite3.enc.
-  */
-  if( meta[BTREE_TEXT_ENCODING-1] ){  /* text encoding */
-    if( iDb==0 ){
-      u8 encoding;
-      /* If opening the main database, set ENC(db). */
-      encoding = (u8)meta[BTREE_TEXT_ENCODING-1] & 3;
-      if( encoding==0 ) encoding = SQLITE_UTF8;
-      ENC(db) = encoding;
-      db->pDfltColl = sqlite3FindCollSeq(db, SQLITE_UTF8, "BINARY", 0);
-    }else{
-      /* If opening an attached database, the encoding much match ENC(db) */
-      if( meta[BTREE_TEXT_ENCODING-1]!=ENC(db) ){
-        sqlite3SetString(pzErrMsg, db, "attached databases must use the same"
-            " text encoding as main database");
-        rc = SQLITE_ERROR;
-        goto initone_error_out;
-      }
-    }
-  }else{
-    DbSetProperty(db, iDb, DB_Empty);
-  }
-  pDb->pSchema->enc = ENC(db);
-
-  if( pDb->pSchema->cache_size==0 ){
-    size = meta[BTREE_DEFAULT_CACHE_SIZE-1];
-    if( size==0 ){ size = SQLITE_DEFAULT_CACHE_SIZE; }
-    if( size<0 ) size = -size;
-    pDb->pSchema->cache_size = size;
-    sqlite3BtreeSetCacheSize(pDb->pBt, pDb->pSchema->cache_size);
-  }
-
-  /*
-  ** file_format==1    Version 3.0.0.
-  ** file_format==2    Version 3.1.3.  // ALTER TABLE ADD COLUMN
-  ** file_format==3    Version 3.1.4.  // ditto but with non-NULL defaults
-  ** file_format==4    Version 3.3.0.  // DESC indices.  Boolean constants
-  */
-  pDb->pSchema->file_format = (u8)meta[BTREE_FILE_FORMAT-1];
-  if( pDb->pSchema->file_format==0 ){
-    pDb->pSchema->file_format = 1;
-  }
-  if( pDb->pSchema->file_format>SQLITE_MAX_FILE_FORMAT ){
-    sqlite3SetString(pzErrMsg, db, "unsupported file format");
-    rc = SQLITE_ERROR;
-    goto initone_error_out;
-  }
-
-  /* Ticket #2804:  When we open a database in the newer file format,
-  ** clear the legacy_file_format pragma flag so that a VACUUM will
-  ** not downgrade the database and thus invalidate any descending
-  ** indices that the user might have created.
-  */
-  if( iDb==0 && meta[BTREE_FILE_FORMAT-1]>=4 ){
-    db->flags &= ~SQLITE_LegacyFileFmt;
-  }
-
-  /* Read the schema information out of the schema tables
-  */
-  assert( db->init.busy );
-  {
-    char *zSql;
-    zSql = sqlite3MPrintf(db, 
-        "SELECT name, rootpage, sql FROM '%q'.%s",
-        db->aDb[iDb].zName, zMasterName);
-    (void)sqlite3SafetyOff(db);
-#ifndef SQLITE_OMIT_AUTHORIZATION
-    {
-      int (*xAuth)(void*,int,const char*,const char*,const char*,const char*);
-      xAuth = db->xAuth;
-      db->xAuth = 0;
-#endif
-      rc = sqlite3_exec(db, zSql, sqlite3InitCallback, &initData, 0);
-#ifndef SQLITE_OMIT_AUTHORIZATION
-      db->xAuth = xAuth;
-    }
-#endif
-    if( rc==SQLITE_OK ) rc = initData.rc;
-    (void)sqlite3SafetyOn(db);
-    sqlite3DbFree(db, zSql);
-#ifndef SQLITE_OMIT_ANALYZE
-    if( rc==SQLITE_OK ){
-      sqlite3AnalysisLoad(db, iDb);
-    }
-#endif
-  }
-  if( db->mallocFailed ){
-    rc = SQLITE_NOMEM;
-    sqlite3ResetInternalSchema(db, 0);
-  }
-  if( rc==SQLITE_OK || (db->flags&SQLITE_RecoveryMode)){
-    /* Black magic: If the SQLITE_RecoveryMode flag is set, then consider
-    ** the schema loaded, even if errors occurred. In this situation the 
-    ** current sqlite3_prepare() operation will fail, but the following one
-    ** will attempt to compile the supplied statement against whatever subset
-    ** of the schema was loaded before the error occurred. The primary
-    ** purpose of this is to allow access to the sqlite_master table
-    ** even when its contents have been corrupted.
-    */
-    DbSetProperty(db, iDb, DB_SchemaLoaded);
-    rc = SQLITE_OK;
-  }
-
-  /* Jump here for an error that occurs after successfully allocating
-  ** curMain and calling sqlite3BtreeEnter(). For an error that occurs
-  ** before that point, jump to error_out.
-  */
-initone_error_out:
-  if( openedTransaction ){
-    sqlite3BtreeCommit(pDb->pBt);
-  }
-  sqlite3BtreeLeave(pDb->pBt);
-
-error_out:
-  if( rc==SQLITE_NOMEM || rc==SQLITE_IOERR_NOMEM ){
-    db->mallocFailed = 1;
-  }
-  return rc;
-}
-
-/*
-** Initialize all database files - the main database file, the file
-** used to store temporary tables, and any additional database files
-** created using ATTACH statements.  Return a success code.  If an
-** error occurs, write an error message into *pzErrMsg.
-**
-** After a database is initialized, the DB_SchemaLoaded bit is set
-** bit is set in the flags field of the Db structure. If the database
-** file was of zero-length, then the DB_Empty flag is also set.
-*/
-int sqlite3Init(sqlite3 *db, char **pzErrMsg){
-  int i, rc;
-  int commit_internal = !(db->flags&SQLITE_InternChanges);
-  
-  assert( sqlite3_mutex_held(db->mutex) );
-  rc = SQLITE_OK;
-  db->init.busy = 1;
-  for(i=0; rc==SQLITE_OK && i<db->nDb; i++){
-    if( DbHasProperty(db, i, DB_SchemaLoaded) || i==1 ) continue;
-    rc = sqlite3InitOne(db, i, pzErrMsg);
-    if( rc ){
-      sqlite3ResetInternalSchema(db, i);
-    }
-  }
-
-  /* Once all the other databases have been initialised, load the schema
-  ** for the TEMP database. This is loaded last, as the TEMP database
-  ** schema may contain references to objects in other databases.
-  */
-#ifndef SQLITE_OMIT_TEMPDB
-  if( rc==SQLITE_OK && ALWAYS(db->nDb>1)
-                    && !DbHasProperty(db, 1, DB_SchemaLoaded) ){
-    rc = sqlite3InitOne(db, 1, pzErrMsg);
-    if( rc ){
-      sqlite3ResetInternalSchema(db, 1);
-    }
-  }
-#endif
-
-  db->init.busy = 0;
-  if( rc==SQLITE_OK && commit_internal ){
-    sqlite3CommitInternalChanges(db);
-  }
-
-  return rc; 
-}
-
-/*
-** This routine is a no-op if the database schema is already initialised.
-** Otherwise, the schema is loaded. An error code is returned.
-*/
-int sqlite3ReadSchema(Parse *pParse){
-  int rc = SQLITE_OK;
-  sqlite3 *db = pParse->db;
-  assert( sqlite3_mutex_held(db->mutex) );
-  if( !db->init.busy ){
-    rc = sqlite3Init(db, &pParse->zErrMsg);
-  }
-  if( rc!=SQLITE_OK ){
-    pParse->rc = rc;
-    pParse->nErr++;
-  }
-  return rc;
-}
-
-
-/*
-** Check schema cookies in all databases.  If any cookie is out
-** of date set pParse->rc to SQLITE_SCHEMA.  If all schema cookies
-** make no changes to pParse->rc.
-*/
-static void schemaIsValid(Parse *pParse){
-  sqlite3 *db = pParse->db;
-  int iDb;
-  int rc;
-  int cookie;
-
-  assert( pParse->checkSchema );
-  assert( sqlite3_mutex_held(db->mutex) );
-  for(iDb=0; iDb<db->nDb; iDb++){
-    int openedTransaction = 0;         /* True if a transaction is opened */
-    Btree *pBt = db->aDb[iDb].pBt;     /* Btree database to read cookie from */
-    if( pBt==0 ) continue;
-
-    /* If there is not already a read-only (or read-write) transaction opened
-    ** on the b-tree database, open one now. If a transaction is opened, it 
-    ** will be closed immediately after reading the meta-value. */
-    if( !sqlite3BtreeIsInReadTrans(pBt) ){
-      rc = sqlite3BtreeBeginTrans(pBt, 0);
-      if( rc==SQLITE_NOMEM || rc==SQLITE_IOERR_NOMEM ){
-        db->mallocFailed = 1;
-      }
-      if( rc!=SQLITE_OK ) return;
-      openedTransaction = 1;
-    }
-
-    /* Read the schema cookie from the database. If it does not match the 
-    ** value stored as part of the in the in-memory schema representation,
-    ** set Parse.rc to SQLITE_SCHEMA. */
-    sqlite3BtreeGetMeta(pBt, BTREE_SCHEMA_VERSION, (u32 *)&cookie);
-    if( cookie!=db->aDb[iDb].pSchema->schema_cookie ){
-      pParse->rc = SQLITE_SCHEMA;
-    }
-
-    /* Close the transaction, if one was opened. */
-    if( openedTransaction ){
-      sqlite3BtreeCommit(pBt);
-    }
-  }
-}
-
-/*
-** Convert a schema pointer into the iDb index that indicates
-** which database file in db->aDb[] the schema refers to.
-**
-** If the same database is attached more than once, the first
-** attached database is returned.
-*/
-int sqlite3SchemaToIndex(sqlite3 *db, Schema *pSchema){
-  int i = -1000000;
-
-  /* If pSchema is NULL, then return -1000000. This happens when code in 
-  ** expr.c is trying to resolve a reference to a transient table (i.e. one
-  ** created by a sub-select). In this case the return value of this 
-  ** function should never be used.
-  **
-  ** We return -1000000 instead of the more usual -1 simply because using
-  ** -1000000 as the incorrect index into db->aDb[] is much 
-  ** more likely to cause a segfault than -1 (of course there are assert()
-  ** statements too, but it never hurts to play the odds).
-  */
-  assert( sqlite3_mutex_held(db->mutex) );
-  if( pSchema ){
-    for(i=0; ALWAYS(i<db->nDb); i++){
-      if( db->aDb[i].pSchema==pSchema ){
-        break;
-      }
-    }
-    assert( i>=0 && i<db->nDb );
-  }
-  return i;
-}
-
-/*
-** Compile the UTF-8 encoded SQL statement zSql into a statement handle.
-*/
-static int sqlite3Prepare(
-  sqlite3 *db,              /* Database handle. */
-  const char *zSql,         /* UTF-8 encoded SQL statement. */
-  int nBytes,               /* Length of zSql in bytes. */
-  int saveSqlFlag,          /* True to copy SQL text into the sqlite3_stmt */
-  sqlite3_stmt **ppStmt,    /* OUT: A pointer to the prepared statement */
-  const char **pzTail       /* OUT: End of parsed string */
-){
-  Parse *pParse;            /* Parsing context */
-  char *zErrMsg = 0;        /* Error message */
-  int rc = SQLITE_OK;       /* Result code */
-  int i;                    /* Loop counter */
-
-  /* Allocate the parsing context */
-  pParse = sqlite3StackAllocZero(db, sizeof(*pParse));
-  if( pParse==0 ){
-    rc = SQLITE_NOMEM;
-    goto end_prepare;
-  }
-
-  if( sqlite3SafetyOn(db) ){
-    rc = SQLITE_MISUSE;
-    goto end_prepare;
-  }
-  assert( ppStmt && *ppStmt==0 );
-  assert( !db->mallocFailed );
-  assert( sqlite3_mutex_held(db->mutex) );
-
-  /* Check to verify that it is possible to get a read lock on all
-  ** database schemas.  The inability to get a read lock indicates that
-  ** some other database connection is holding a write-lock, which in
-  ** turn means that the other connection has made uncommitted changes
-  ** to the schema.
-  **
-  ** Were we to proceed and prepare the statement against the uncommitted
-  ** schema changes and if those schema changes are subsequently rolled
-  ** back and different changes are made in their place, then when this
-  ** prepared statement goes to run the schema cookie would fail to detect
-  ** the schema change.  Disaster would follow.
-  **
-  ** This thread is currently holding mutexes on all Btrees (because
-  ** of the sqlite3BtreeEnterAll() in sqlite3LockAndPrepare()) so it
-  ** is not possible for another thread to start a new schema change
-  ** while this routine is running.  Hence, we do not need to hold 
-  ** locks on the schema, we just need to make sure nobody else is 
-  ** holding them.
-  **
-  ** Note that setting READ_UNCOMMITTED overrides most lock detection,
-  ** but it does *not* override schema lock detection, so this all still
-  ** works even if READ_UNCOMMITTED is set.
-  */
-  for(i=0; i<db->nDb; i++) {
-    Btree *pBt = db->aDb[i].pBt;
-    if( pBt ){
-      assert( sqlite3BtreeHoldsMutex(pBt) );
-      rc = sqlite3BtreeSchemaLocked(pBt);
-      if( rc ){
-        const char *zDb = db->aDb[i].zName;
-        sqlite3Error(db, rc, "database schema is locked: %s", zDb);
-        (void)sqlite3SafetyOff(db);
-        testcase( db->flags & SQLITE_ReadUncommitted );
-        goto end_prepare;
-      }
-    }
-  }
-
-  sqlite3VtabUnlockList(db);
-
-  pParse->db = db;
-  if( nBytes>=0 && (nBytes==0 || zSql[nBytes-1]!=0) ){
-    char *zSqlCopy;
-    int mxLen = db->aLimit[SQLITE_LIMIT_SQL_LENGTH];
-    testcase( nBytes==mxLen );
-    testcase( nBytes==mxLen+1 );
-    if( nBytes>mxLen ){
-      sqlite3Error(db, SQLITE_TOOBIG, "statement too long");
-      (void)sqlite3SafetyOff(db);
-      rc = sqlite3ApiExit(db, SQLITE_TOOBIG);
-      goto end_prepare;
-    }
-    zSqlCopy = sqlite3DbStrNDup(db, zSql, nBytes);
-    if( zSqlCopy ){
-      sqlite3RunParser(pParse, zSqlCopy, &zErrMsg);
-      sqlite3DbFree(db, zSqlCopy);
-      pParse->zTail = &zSql[pParse->zTail-zSqlCopy];
-    }else{
-      pParse->zTail = &zSql[nBytes];
-    }
-  }else{
-    sqlite3RunParser(pParse, zSql, &zErrMsg);
-  }
-
-  if( db->mallocFailed ){
-    pParse->rc = SQLITE_NOMEM;
-  }
-  if( pParse->rc==SQLITE_DONE ) pParse->rc = SQLITE_OK;
-  if( pParse->checkSchema ){
-    schemaIsValid(pParse);
-  }
-  if( pParse->rc==SQLITE_SCHEMA ){
-    sqlite3ResetInternalSchema(db, 0);
-  }
-  if( db->mallocFailed ){
-    pParse->rc = SQLITE_NOMEM;
-  }
-  if( pzTail ){
-    *pzTail = pParse->zTail;
-  }
-  rc = pParse->rc;
-
-#ifndef SQLITE_OMIT_EXPLAIN
-  if( rc==SQLITE_OK && pParse->pVdbe && pParse->explain ){
-    static const char * const azColName[] = {
-       "addr", "opcode", "p1", "p2", "p3", "p4", "p5", "comment",
-       "order", "from", "detail"
-    };
-    int iFirst, mx;
-    if( pParse->explain==2 ){
-      sqlite3VdbeSetNumCols(pParse->pVdbe, 3);
-      iFirst = 8;
-      mx = 11;
-    }else{
-      sqlite3VdbeSetNumCols(pParse->pVdbe, 8);
-      iFirst = 0;
-      mx = 8;
-    }
-    for(i=iFirst; i<mx; i++){
-      sqlite3VdbeSetColName(pParse->pVdbe, i-iFirst, COLNAME_NAME,
-                            azColName[i], SQLITE_STATIC);
-    }
-  }
-#endif
-
-  if( sqlite3SafetyOff(db) ){
-    rc = SQLITE_MISUSE;
-  }
-
-  assert( db->init.busy==0 || saveSqlFlag==0 );
-  if( db->init.busy==0 ){
-    Vdbe *pVdbe = pParse->pVdbe;
-    sqlite3VdbeSetSql(pVdbe, zSql, (int)(pParse->zTail-zSql), saveSqlFlag);
-  }
-  if( pParse->pVdbe && (rc!=SQLITE_OK || db->mallocFailed) ){
-    sqlite3VdbeFinalize(pParse->pVdbe);
-    assert(!(*ppStmt));
-  }else{
-    *ppStmt = (sqlite3_stmt*)pParse->pVdbe;
-  }
-
-  if( zErrMsg ){
-    sqlite3Error(db, rc, "%s", zErrMsg);
-    sqlite3DbFree(db, zErrMsg);
-  }else{
-    sqlite3Error(db, rc, 0);
-  }
-
-  /* Delete any TriggerPrg structures allocated while parsing this statement. */
-  while( pParse->pTriggerPrg ){
-    TriggerPrg *pT = pParse->pTriggerPrg;
-    pParse->pTriggerPrg = pT->pNext;
-    sqlite3VdbeProgramDelete(db, pT->pProgram, 0);
-    sqlite3DbFree(db, pT);
-  }
-
-end_prepare:
-
-  sqlite3StackFree(db, pParse);
-  rc = sqlite3ApiExit(db, rc);
-  assert( (rc&db->errMask)==rc );
-  return rc;
-}
-static int sqlite3LockAndPrepare(
-  sqlite3 *db,              /* Database handle. */
-  const char *zSql,         /* UTF-8 encoded SQL statement. */
-  int nBytes,               /* Length of zSql in bytes. */
-  int saveSqlFlag,          /* True to copy SQL text into the sqlite3_stmt */
-  sqlite3_stmt **ppStmt,    /* OUT: A pointer to the prepared statement */
-  const char **pzTail       /* OUT: End of parsed string */
-){
-  int rc;
-  assert( ppStmt!=0 );
-  *ppStmt = 0;
-  if( !sqlite3SafetyCheckOk(db) ){
-    return SQLITE_MISUSE;
-  }
-  sqlite3_mutex_enter(db->mutex);
-  sqlite3BtreeEnterAll(db);
-  rc = sqlite3Prepare(db, zSql, nBytes, saveSqlFlag, ppStmt, pzTail);
-  if( rc==SQLITE_SCHEMA ){
-    sqlite3_finalize(*ppStmt);
-    rc = sqlite3Prepare(db, zSql, nBytes, saveSqlFlag, ppStmt, pzTail);
-  }
-  sqlite3BtreeLeaveAll(db);
-  sqlite3_mutex_leave(db->mutex);
-  return rc;
-}
-
-/*
-** Rerun the compilation of a statement after a schema change.
-**
-** If the statement is successfully recompiled, return SQLITE_OK. Otherwise,
-** if the statement cannot be recompiled because another connection has
-** locked the sqlite3_master table, return SQLITE_LOCKED. If any other error
-** occurs, return SQLITE_SCHEMA.
-*/
-int sqlite3Reprepare(Vdbe *p){
-  int rc;
-  sqlite3_stmt *pNew;
-  const char *zSql;
-  sqlite3 *db;
-
-  assert( sqlite3_mutex_held(sqlite3VdbeDb(p)->mutex) );
-  zSql = sqlite3_sql((sqlite3_stmt *)p);
-  assert( zSql!=0 );  /* Reprepare only called for prepare_v2() statements */
-  db = sqlite3VdbeDb(p);
-  assert( sqlite3_mutex_held(db->mutex) );
-  rc = sqlite3LockAndPrepare(db, zSql, -1, 0, &pNew, 0);
-  if( rc ){
-    if( rc==SQLITE_NOMEM ){
-      db->mallocFailed = 1;
-    }
-    assert( pNew==0 );
-    return (rc==SQLITE_LOCKED) ? SQLITE_LOCKED : SQLITE_SCHEMA;
-  }else{
-    assert( pNew!=0 );
-  }
-  sqlite3VdbeSwap((Vdbe*)pNew, p);
-  sqlite3TransferBindings(pNew, (sqlite3_stmt*)p);
-  sqlite3VdbeResetStepResult((Vdbe*)pNew);
-  sqlite3VdbeFinalize((Vdbe*)pNew);
-  return SQLITE_OK;
-}
-
-
-/*
-** Two versions of the official API.  Legacy and new use.  In the legacy
-** version, the original SQL text is not saved in the prepared statement
-** and so if a schema change occurs, SQLITE_SCHEMA is returned by
-** sqlite3_step().  In the new version, the original SQL text is retained
-** and the statement is automatically recompiled if an schema change
-** occurs.
-*/
-int sqlite3_prepare(
-  sqlite3 *db,              /* Database handle. */
-  const char *zSql,         /* UTF-8 encoded SQL statement. */
-  int nBytes,               /* Length of zSql in bytes. */
-  sqlite3_stmt **ppStmt,    /* OUT: A pointer to the prepared statement */
-  const char **pzTail       /* OUT: End of parsed string */
-){
-  int rc;
-  rc = sqlite3LockAndPrepare(db,zSql,nBytes,0,ppStmt,pzTail);
-  assert( rc==SQLITE_OK || ppStmt==0 || *ppStmt==0 );  /* VERIFY: F13021 */
-  return rc;
-}
-int sqlite3_prepare_v2(
-  sqlite3 *db,              /* Database handle. */
-  const char *zSql,         /* UTF-8 encoded SQL statement. */
-  int nBytes,               /* Length of zSql in bytes. */
-  sqlite3_stmt **ppStmt,    /* OUT: A pointer to the prepared statement */
-  const char **pzTail       /* OUT: End of parsed string */
-){
-  int rc;
-  rc = sqlite3LockAndPrepare(db,zSql,nBytes,1,ppStmt,pzTail);
-  assert( rc==SQLITE_OK || ppStmt==0 || *ppStmt==0 );  /* VERIFY: F13021 */
-  return rc;
-}
-
-
-#ifndef SQLITE_OMIT_UTF16
-/*
-** Compile the UTF-16 encoded SQL statement zSql into a statement handle.
-*/
-static int sqlite3Prepare16(
-  sqlite3 *db,              /* Database handle. */ 
-  const void *zSql,         /* UTF-8 encoded SQL statement. */
-  int nBytes,               /* Length of zSql in bytes. */
-  int saveSqlFlag,          /* True to save SQL text into the sqlite3_stmt */
-  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;
-
-  assert( ppStmt );
-  *ppStmt = 0;
-  if( !sqlite3SafetyCheckOk(db) ){
-    return SQLITE_MISUSE;
-  }
-  sqlite3_mutex_enter(db->mutex);
-  zSql8 = sqlite3Utf16to8(db, zSql, nBytes);
-  if( zSql8 ){
-    rc = sqlite3LockAndPrepare(db, zSql8, -1, saveSqlFlag, 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, (int)(zTail8-zSql8));
-    *pzTail = (u8 *)zSql + sqlite3Utf16ByteLen(zSql, chars_parsed);
-  }
-  sqlite3DbFree(db, zSql8); 
-  rc = sqlite3ApiExit(db, rc);
-  sqlite3_mutex_leave(db->mutex);
-  return rc;
-}
-
-/*
-** Two versions of the official API.  Legacy and new use.  In the legacy
-** version, the original SQL text is not saved in the prepared statement
-** and so if a schema change occurs, SQLITE_SCHEMA is returned by
-** sqlite3_step().  In the new version, the original SQL text is retained
-** and the statement is automatically recompiled if an schema change
-** occurs.
-*/
-int sqlite3_prepare16(
-  sqlite3 *db,              /* Database handle. */ 
-  const void *zSql,         /* UTF-8 encoded SQL statement. */
-  int nBytes,               /* Length of zSql in bytes. */
-  sqlite3_stmt **ppStmt,    /* OUT: A pointer to the prepared statement */
-  const void **pzTail       /* OUT: End of parsed string */
-){
-  int rc;
-  rc = sqlite3Prepare16(db,zSql,nBytes,0,ppStmt,pzTail);
-  assert( rc==SQLITE_OK || ppStmt==0 || *ppStmt==0 );  /* VERIFY: F13021 */
-  return rc;
-}
-int sqlite3_prepare16_v2(
-  sqlite3 *db,              /* Database handle. */ 
-  const void *zSql,         /* UTF-8 encoded SQL statement. */
-  int nBytes,               /* Length of zSql in bytes. */
-  sqlite3_stmt **ppStmt,    /* OUT: A pointer to the prepared statement */
-  const void **pzTail       /* OUT: End of parsed string */
-){
-  int rc;
-  rc = sqlite3Prepare16(db,zSql,nBytes,1,ppStmt,pzTail);
-  assert( rc==SQLITE_OK || ppStmt==0 || *ppStmt==0 );  /* VERIFY: F13021 */
-  return rc;
-}
-
-#endif /* SQLITE_OMIT_UTF16 */