Allow one to send empty strings with mysql_stmt_send_long_data()

mysql_stmt_reset() now resets param->long_data_used
Abort if --defaults-file=path-name uses a non-existing file (Bug #3413)
Fixed problem with symlink test (bug in 4.1.2)

libmysql/libmysql.c

@@ -2754,12 +2754,13 @@ mysql_stmt_send_long_data(MYSQL_STMT *stmt, uint param_number,
     DBUG_RETURN(1);
   }
   /* Mark for execute that the result is already sent */
-  param->long_data_used= 1;
-  if (length)
+  if (length || param->long_data_used == 0)
   {
     MYSQL *mysql= stmt->mysql;
     char   *packet, extra_data[MYSQL_LONG_DATA_HEADER];
 
+    param->long_data_used= 1;
+
     packet= extra_data;
     int4store(packet, stmt->stmt_id);	   packet+=4;
     int2store(packet, param_number);	   packet+=2;
@@ -3805,6 +3806,7 @@ my_bool STDCALL mysql_stmt_reset(MYSQL_STMT *stmt)
 {
   char buff[MYSQL_STMT_HEADER];
   MYSQL *mysql;
+  MYSQL_BIND *param, *param_end;
   DBUG_ENTER("mysql_stmt_reset");
   DBUG_ASSERT(stmt != 0);
 
@@ -3820,6 +3822,13 @@ my_bool STDCALL mysql_stmt_reset(MYSQL_STMT *stmt)
                     mysql->net.sqlstate);
     DBUG_RETURN(1);
   }
+
+  /* Clear long_data_used for next call (as we do in mysql_stmt_execute() */
+  for (param= stmt->params, param_end= param + stmt->param_count;
+       param < param_end;
+       param++)
+    param->long_data_used= 0;
+
   DBUG_RETURN(0);
 }
 

mysys/default.c

@@ -166,6 +166,12 @@ int load_defaults(const char *conf_file, const char **groups,
     if ((error= search_default_file(&args, &alloc, "",
 				    forced_default_file, "", &group)) < 0)
       goto err;
+    if (error > 0)
+    {
+      fprintf(stderr, "Could not open required defaults file: %s\n",
+              forced_default_file);
+      goto err;
+    }
   }
   else if (dirname_length(conf_file))
   {

sql/unireg.cc

@@ -214,9 +214,13 @@ int rea_create_table(THD *thd, my_string file_name,
   DBUG_ENTER("rea_create_table");
 
   if (mysql_create_frm(thd, file_name, create_info,
-  		       create_fields, keys, key_info, NULL) ||
-      ha_create_table(file_name,create_info,0))
+  		       create_fields, keys, key_info, NULL))
     DBUG_RETURN(1);
+  if (ha_create_table(file_name,create_info,0))
+  {
+    my_delete(file_name,MYF(0));    
+    DBUG_RETURN(1);
+  }
   DBUG_RETURN(0);
 } /* rea_create_table */