1 /* 2 * Copyright (C) 2011 Dan Carpenter. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 2 7 * of the License, or (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt 16 */ 17 18 #include "smatch.h" 19 20 static int my_id; 21 22 static void match_memset(const char *fn, struct expression *expr, void *data) 23 { 24 struct expression *arg_expr; 25 sval_t sval; 26 27 arg_expr = get_argument_from_call_expr(expr->args, 2); 28 29 if (arg_expr->type != EXPR_VALUE) 30 return; 31 if (!get_value(arg_expr, &sval)) 32 return; 33 if (sval.value != 0) 34 return; 35 sm_error("calling memset(x, y, 0);"); 36 } 37 38 void check_memset(int id) 39 { 40 my_id = id; 41 add_function_hook("memset", &match_memset, NULL); 42 add_function_hook("__builtin_memset", &match_memset, NULL); 43 } 44