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 /*
27 * Copyright 2018 Nexenta Systems, Inc.
28 */
29
30 #define __STDC_WANT_LIB_EXT1__ 1
31
32 #include "lint.h"
33
34 #include <errno.h>
35 #include <stddef.h>
36 #include <stdint.h>
37 #include <string.h>
38
39 #include "libc.h"
40
41 /* __memset_vp is a volatile pointer to memset() function */
42 static void *(*const volatile __memset_vp)(void *, int, size_t) = (memset);
43
44 /* ISO/IEC 9899:2011 K.3.7.4.1 */
45 errno_t
memset_s(void * s,rsize_t smax,int c,rsize_t n)46 memset_s(void *s, rsize_t smax, int c, rsize_t n)
47 {
48 errno_t ret;
49 rsize_t lim;
50 unsigned char v;
51
52 ret = EINVAL;
53 lim = n < smax ? n : smax;
54 v = (unsigned char)c;
55 if (s == NULL) {
56 __throw_constraint_handler_s("memset_s: s is NULL", ret);
57 } else if (smax > RSIZE_MAX) {
58 __throw_constraint_handler_s("memset_s: smax > RSIZE_MAX",
59 ret);
60 } else {
61 /*
62 * Both s and smax are valid, fill the memory buffer using
63 * memset() called through a volatile pointer to guarantee
64 * it will not be optimized away.
65 */
66 (void) (*__memset_vp)(s, v, lim);
67
68 if (n > RSIZE_MAX) {
69 __throw_constraint_handler_s("memset_s: n > RSIZE_MAX",
70 ret);
71 } else if (n > smax) {
72 __throw_constraint_handler_s("memset_s: n > smax", ret);
73 } else {
74 ret = 0;
75 }
76 }
77 return (ret);
78 }
79