check_memset.c

   1 /*
   2  * sparse/check_memset.c
   3  *
   4  * Copyright (C) 2011 Dan Carpenter.
   5  *
   6  * Licensed under the Open Software License version 1.1
   7  *
   8  */
   9
  10 #include "smatch.h"
  11
  12 static int my_id;
  13
  14 static void match_memset(const char *fn, struct expression *expr, void *data)
  15 {
  16         struct expression *arg_expr;
  17         sval_t sval;
  18
  19         arg_expr = get_argument_from_call_expr(expr->args, 2);
  20
  21         if (arg_expr->type != EXPR_VALUE)
  22                 return;
  23         if (!get_value_sval(arg_expr, &sval))
  24                 return;
  25         if (sval.value != 0)
  26                 return;
  27         sm_msg("error: calling memset(x, y, 0);");
  28 }
  29
  30 void check_memset(int id)
  31 {
  32         my_id = id;
  33         add_function_hook("memset", &match_memset, NULL);
  34         add_function_hook("__builtin_memset", &match_memset, NULL);
  35 }