Add the savepoint feature. This feature is largely untested at this point. (CVS 6036)

FossilOrigin-Name: 34b56600ec0c5cd7b5faab265750252bc9850e3e

src/main.c

@@ -14,7 +14,7 @@
 ** other files are for internal use by SQLite and should not be
 ** accessed by users of the library.
 **
-** $Id: main.c,v 1.519 2008/12/10 23:04:13 drh Exp $
+** $Id: main.c,v 1.520 2008/12/17 17:30:26 danielk1977 Exp $
 */
 #include "sqliteInt.h"
 #include <ctype.h>
@@ -545,6 +545,21 @@ int sqlite3_total_changes(sqlite3 *db){
   return db->nTotalChange;
 }
 
+/*
+** Close all open savepoints. This function only manipulates fields of the
+** database handle object, it does not close any savepoints that may be open
+** at the b-tree/pager level.
+*/
+void sqlite3CloseSavepoints(sqlite3 *db){
+  while( db->pSavepoint ){
+    Savepoint *pTmp = db->pSavepoint;
+    db->pSavepoint = pTmp->pNext;
+    sqlite3DbFree(db, pTmp);
+  }
+  db->nSavepoint = 0;
+  db->isTransactionSavepoint = 0;
+}
+
 /*
 ** Close an existing SQLite database
 */
@@ -587,6 +602,9 @@ int sqlite3_close(sqlite3 *db){
   }
   assert( sqlite3SafetyCheckSickOrOk(db) );
 
+  /* Free any outstanding Savepoint structures. */
+  sqlite3CloseSavepoints(db);
+
   for(j=0; j<db->nDb; j++){
     struct Db *pDb = &db->aDb[j];
     if( pDb->pBt ){