Annotation of embedaddon/sudo/compat/memset_s.c, revision 1.1.1.1
1.1 misho 1: /*
2: * Copyright (c) 2013 Todd C. Miller <Todd.Miller@courtesan.com>
3: *
4: * Permission to use, copy, modify, and distribute this software for any
5: * purpose with or without fee is hereby granted, provided that the above
6: * copyright notice and this permission notice appear in all copies.
7: *
8: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15: */
16:
17: #include <config.h>
18:
19: #include <sys/types.h>
20: #include <errno.h>
21: #include <limits.h>
22: #if defined(HAVE_STDINT_H)
23: # include <stdint.h>
24: #elif defined(HAVE_INTTYPES_H)
25: # include <inttypes.h>
26: #endif
27:
28: #include "missing.h"
29:
30: #ifndef RSIZE_MAX
31: # if defined(SIZE_MAX)
32: # define RSIZE_MAX (SIZE_MAX >> 1)
33: # elif defined(__LP64__)
34: # define RSIZE_MAX 0x7fffffffffffffffUL
35: # else
36: # define RSIZE_MAX 0x7fffffffU
37: # endif
38: #endif
39:
40: /*
41: * Simple implementation of C11 memset_s() function.
42: * We use a volatile pointer when updating the byte string.
43: * Most compilers will avoid optimizing away access to a
44: * volatile pointer, even if the pointer appears to be unused
45: * after the call.
46: *
47: * Note that C11 does not specify the return value on error, only
48: * that it be non-zero. We use EINVAL for all errors.
49: */
50: errno_t
51: memset_s(void *v, rsize_t smax, int c, rsize_t n)
52: {
53: errno_t ret = 0;
54: volatile unsigned char *s = v;
55:
56: /* Fatal runtime-constraint violations. */
57: if (s == NULL || smax > RSIZE_MAX) {
58: ret = errno = EINVAL;
59: goto done;
60: }
61: /* Non-fatal runtime-constraint violation, n must not exceed smax. */
62: if (n > smax) {
63: n = smax;
64: ret = errno = EINVAL;
65: }
66: /* Updating through a volatile pointer should not be optimized away. */
67: while (n--)
68: *s++ = (unsigned char)c;
69: done:
70: return ret;
71: }
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