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 38 void register_annotate(int id) 39 { 40 /* 41 * Technically snprintf() returns the number of bytes which *would* have 42 * been printed. I do try caclulating that in check_snprintf(). But 43 * it probably works better to assume the limitter is accurate. 44 */ 45 add_implied_return_hook("snprintf", ¶m_caps_return, INT_PTR(1)); 46 47 } 48