smatch_annotate.c

   1 /*
   2  * Copyright (C) 2013 Oracle.
   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 /*
  19  * A place to add function annotations for common functions.
  20  *
  21  */
  22
  23 #include "smatch.h"
  24 #include "smatch_extra.h"
  25
  26 static int param_caps_return(struct expression *call, void *_arg, struct range_list **res)
  27 {
  28         int arg = PTR_INT(_arg);
  29         struct expression *expr;
  30         struct range_list *rl;
  31
  32         expr = get_argument_from_call_expr(call->args, arg);
  33         if (get_implied_rl(expr, &rl) && rl_max(rl).value != 0) {
  34                 *res = alloc_rl(sval_type_val(rl_type(rl), 0), rl_max(rl));
  35                 return 1;
  36         }
  37         return 0;
  38 }
  39
  40 void register_annotate(int id)
  41 {
  42         /*
  43          * Technically snprintf() returns the number of bytes which *would* have
  44          * been printed.  I do try calculating that in check_snprintf().  But
  45          * it probably works better to assume the limiter is accurate.
  46          */
  47         add_implied_return_hook("snprintf", &param_caps_return, INT_PTR(1));
  48
  49 }