1 /*-
2 * Copyright (c) 2017 Juniper Networks. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 *
25 * $FreeBSD: head/lib/libc/string/memset_s.c 322427 2017-08-12 15:18:17Z kib $
26 */
27
28 #include <errno.h>
29 #include <stddef.h>
30 #include <stdint.h>
31 #include <string.h>
32 #include "libc_private.h"
33
34 /* ISO/IEC 9899:2011 K.3.7.4.1 */
35 errno_t
memset_s(void * s,rsize_t smax,int c,rsize_t n)36 memset_s(void *s, rsize_t smax, int c, rsize_t n)
37 {
38 errno_t ret;
39 rsize_t lim;
40 unsigned char v;
41 volatile unsigned char *dst;
42
43 ret = EINVAL;
44 lim = n < smax ? n : smax;
45 v = (unsigned char)c;
46 dst = (unsigned char *)s;
47 if (s == NULL) {
48 __throw_constraint_handler_s("memset_s : s is NULL", ret);
49 } else if (smax > RSIZE_MAX) {
50 __throw_constraint_handler_s("memset_s : smax > RSIZE_MAX",
51 ret);
52 } else if (n > RSIZE_MAX) {
53 __throw_constraint_handler_s("memset_s : n > RSIZE_MAX", ret);
54 } else {
55 while (lim > 0)
56 dst[--lim] = v;
57 if (n > smax) {
58 __throw_constraint_handler_s("memset_s : n > smax",
59 ret);
60 } else {
61 ret = 0;
62 }
63 }
64 return (ret);
65 }
66