1// SPDX-License-Identifier: GPL-2.0-only
 2#include <stddef.h>
 3
 4/*
 5 * Override the "basic" built-in string helpers so that they can be used in
 6 * guest code.  KVM selftests don't support dynamic loading in guest code and
 7 * will jump into the weeds if the compiler decides to insert an out-of-line
 8 * call via the PLT.
 9 */
10int memcmp(const void *cs, const void *ct, size_t count)
11{
12	const unsigned char *su1, *su2;
13	int res = 0;
14
15	for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--) {
16		if ((res = *su1 - *su2) != 0)
17			break;
18	}
19	return res;
20}
21
22void *memcpy(void *dest, const void *src, size_t count)
23{
24	char *tmp = dest;
25	const char *s = src;
26
27	while (count--)
28		*tmp++ = *s++;
29	return dest;
30}
31
32void *memset(void *s, int c, size_t count)
33{
34	char *xs = s;
35
36	while (count--)
37		*xs++ = c;
38	return s;
39}

 1// SPDX-License-Identifier: GPL-2.0-only
 2#include <stddef.h>
 3
 4/*
 5 * Override the "basic" built-in string helpers so that they can be used in
 6 * guest code.  KVM selftests don't support dynamic loading in guest code and
 7 * will jump into the weeds if the compiler decides to insert an out-of-line
 8 * call via the PLT.
 9 */
10int memcmp(const void *cs, const void *ct, size_t count)
11{
12	const unsigned char *su1, *su2;
13	int res = 0;
14
15	for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--) {
16		if ((res = *su1 - *su2) != 0)
17			break;
18	}
19	return res;
20}
21
22void *memcpy(void *dest, const void *src, size_t count)
23{
24	char *tmp = dest;
25	const char *s = src;
26
27	while (count--)
28		*tmp++ = *s++;
29	return dest;
30}
31
32void *memset(void *s, int c, size_t count)
33{
34	char *xs = s;
35
36	while (count--)
37		*xs++ = c;
38	return s;
39}
40
41size_t strnlen(const char *s, size_t count)
42{
43	const char *sc;
44
45	for (sc = s; count-- && *sc != '\0'; ++sc)
46		/* nothing */;
47	return sc - s;
48}