add sqlite3mc attach API

Author: avinassh

libsql-ffi/bundled/src/sqlite3.c

@@ -121872,6 +121872,8 @@ SQLITE_PRIVATE int sqlite3DbIsNamed(sqlite3 *db, int iDb, const char *zName){
 int libsql_handle_extra_attach_params(sqlite3* db, const char* zName, const char* zPath, sqlite3_value* pKey, char** zErrDyn);
 #endif
 
+SQLITE_PRIVATE int sqlite3mcHandleAttachKey(sqlite3*, const char*, const char*, sqlite3_value*, char**);
+
 /*
 ** An SQL user-function registered to do the work of an ATTACH statement. The
 ** three arguments to the function come directly from an attach statement:
@@ -122031,6 +122033,16 @@ static void attachFunc(
     rc = libsql_handle_extra_attach_params(db, zName, zPath, argv, &zErrDyn);
   }
 #endif
+
+  /* Handle KEY parameter. */
+  if( rc==SQLITE_OK ){
+    printf("attempting to handle the attach key\n");
+    fflush(stdout);
+    if( argv != NULL && argv[0] != NULL && argv[1] != NULL && argv[2] != NULL ){
+      rc = sqlite3mcHandleAttachKey(db, zName, zPath, argv[2], &zErrDyn);
+    }
+  }
+
   sqlite3_free_filename( zPath );
 
   /* If the file was opened successfully, read the schema for the new database.