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
26#include <errno.h>
27#include <stddef.h>
28#include <stdint.h>
29#include <string.h>
30#include "libc_private.h"
31
32/* ISO/IEC 9899:2011 K.3.7.4.1 */
33errno_t
34memset_s(void *s, rsize_t smax, int c, rsize_t n)
35{
36	errno_t ret;
37	rsize_t lim;
38	unsigned char v;
39	volatile unsigned char *dst;
40
41	ret = EINVAL;
42	lim = n < smax ? n : smax;
43	v = (unsigned char)c;
44	dst = (unsigned char *)s;
45	if (s == NULL) {
46		__throw_constraint_handler_s("memset_s : s is NULL", ret);
47	} else if (smax > RSIZE_MAX) {
48		__throw_constraint_handler_s("memset_s : smax > RSIZE_MAX",
49		    ret);
50	} else if (n > RSIZE_MAX) {
51		__throw_constraint_handler_s("memset_s : n > RSIZE_MAX", ret);
52	} else {
53		while (lim > 0)
54			dst[--lim] = v;
55		if (n > smax) {
56			__throw_constraint_handler_s("memset_s : n > smax",
57			    ret);
58		} else {
59			ret = 0;
60		}
61	}
62	return (ret);
63}
64