Add an experimental "pointer type" parameter to sqlite3_bind_pointer(),

sqlite3_result_pointer(), and sqlite3_value_pointer().  The pointer type is
a string that must compare equal using strcmp() or else the pointer comes
through as a NULL.

FossilOrigin-Name: 211cce04e97d2e325a6ea3e99738fc71115d673dc13daeffb03ac3140deb11de

1 files changed, 10 insertions, 6 deletions

diff --git a/src/vdbeapi.c b/src/vdbeapi.c
index b94facead..9de248633 100644
--- a/src/vdbeapi.c
+++ b/src/vdbeapi.c
@@ -199,9 +199,13 @@ unsigned int sqlite3_value_subtype(sqlite3_value *pVal){
   Mem *pMem = (Mem*)pVal;
   return ((pMem->flags & MEM_Subtype) ? pMem->eSubtype : 0);
 }
-void *sqlite3_value_pointer(sqlite3_value *pVal){
+void *sqlite3_value_pointer(sqlite3_value *pVal, const char *zPType){
   Mem *p = (Mem*)pVal;
-  if( (p->flags & MEM_TypeMask)==(MEM_Null|MEM_Subtype) && p->eSubtype=='p' ){
+  if( (p->flags & MEM_TypeMask)==(MEM_Null|MEM_Subtype)
+   && p->eSubtype=='p'
+   && zPType!=0
+   && strcmp(p->z, zPType)==0
+  ){
     return p->u.pPtr;
   }else{
     return 0;
@@ -385,11 +389,11 @@ void sqlite3_result_null(sqlite3_context *pCtx){
   assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
   sqlite3VdbeMemSetNull(pCtx->pOut);
 }
-void sqlite3_result_pointer(sqlite3_context *pCtx, void *pPtr){
+void sqlite3_result_pointer(sqlite3_context *pCtx, void *pPtr, const char *zPT){
   Mem *pOut = pCtx->pOut;
   assert( sqlite3_mutex_held(pOut->db->mutex) );
   sqlite3VdbeMemSetNull(pOut);
-  sqlite3VdbeMemSetPointer(pOut, pPtr);
+  sqlite3VdbeMemSetPointer(pOut, pPtr, zPT);
 }
 void sqlite3_result_subtype(sqlite3_context *pCtx, unsigned int eSubtype){
   Mem *pOut = pCtx->pOut;
@@ -1394,12 +1398,12 @@ int sqlite3_bind_null(sqlite3_stmt *pStmt, int i){
   }
   return rc;
 }
-int sqlite3_bind_pointer(sqlite3_stmt *pStmt, int i, void *pPtr){
+int sqlite3_bind_pointer(sqlite3_stmt *pStmt, int i, void *pPtr,const char *zT){
   int rc;
   Vdbe *p = (Vdbe*)pStmt;
   rc = vdbeUnbind(p, i);
   if( rc==SQLITE_OK ){
-    sqlite3VdbeMemSetPointer(&p->aVar[i-1], pPtr);
+    sqlite3VdbeMemSetPointer(&p->aVar[i-1], pPtr, zT);
     sqlite3_mutex_leave(p->db->mutex);
   }
   return rc;