1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * arch/arm/boot/compressed/string.c
  4 *
  5 * Small subset of simple string routines
  6 */
  7
  8#include <linux/string.h>
  9
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 10void *memcpy(void *__dest, __const void *__src, size_t __n)
 11{
 12	int i = 0;
 13	unsigned char *d = (unsigned char *)__dest, *s = (unsigned char *)__src;
 14
 15	for (i = __n >> 3; i > 0; i--) {
 16		*d++ = *s++;
 17		*d++ = *s++;
 18		*d++ = *s++;
 19		*d++ = *s++;
 20		*d++ = *s++;
 21		*d++ = *s++;
 22		*d++ = *s++;
 23		*d++ = *s++;
 24	}
 25
 26	if (__n & 1 << 2) {
 27		*d++ = *s++;
 28		*d++ = *s++;
 29		*d++ = *s++;
 30		*d++ = *s++;
 31	}
 32
 33	if (__n & 1 << 1) {
 34		*d++ = *s++;
 35		*d++ = *s++;
 36	}
 37
 38	if (__n & 1)
 39		*d++ = *s++;
 40
 41	return __dest;
 42}
 43
 44void *memmove(void *__dest, __const void *__src, size_t count)
 45{
 46	unsigned char *d = __dest;
 47	const unsigned char *s = __src;
 48
 49	if (__dest == __src)
 50		return __dest;
 51
 52	if (__dest < __src)
 53		return memcpy(__dest, __src, count);
 54
 55	while (count--)
 56		d[count] = s[count];
 57	return __dest;
 58}
 59
 60size_t strlen(const char *s)
 61{
 62	const char *sc = s;
 63
 64	while (*sc != '\0')
 65		sc++;
 66	return sc - s;
 67}
 68
 69size_t strnlen(const char *s, size_t count)
 70{
 71	const char *sc;
 72
 73	for (sc = s; count-- && *sc != '\0'; ++sc)
 74		/* nothing */;
 75	return sc - s;
 76}
 77
 78int memcmp(const void *cs, const void *ct, size_t count)
 79{
 80	const unsigned char *su1 = cs, *su2 = ct, *end = su1 + count;
 81	int res = 0;
 82
 83	while (su1 < end) {
 84		res = *su1++ - *su2++;
 85		if (res)
 86			break;
 87	}
 88	return res;
 89}
 90
 91int strcmp(const char *cs, const char *ct)
 92{
 93	unsigned char c1, c2;
 94	int res = 0;
 95
 96	do {
 97		c1 = *cs++;
 98		c2 = *ct++;
 99		res = c1 - c2;
100		if (res)
101			break;
102	} while (c1);
103	return res;
104}
105
106void *memchr(const void *s, int c, size_t count)
107{
108	const unsigned char *p = s;
109
110	while (count--)
111		if ((unsigned char)c == *p++)
112			return (void *)(p - 1);
113	return NULL;
114}
115
116char *strchr(const char *s, int c)
117{
118	while (*s != (char)c)
119		if (*s++ == '\0')
120			return NULL;
121	return (char *)s;
122}
123
124char *strrchr(const char *s, int c)
125{
126	const char *last = NULL;
127	do {
128		if (*s == (char)c)
129			last = s;
130	} while (*s++);
131	return (char *)last;
132}
133
134#undef memset
135
136void *memset(void *s, int c, size_t count)
137{
138	char *xs = s;
139	while (count--)
140		*xs++ = c;
141	return s;
142}

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * arch/arm/boot/compressed/string.c
  4 *
  5 * Small subset of simple string routines
  6 */
  7
  8#include <linux/string.h>
  9
 10/*
 11 * The decompressor is built without KASan but uses the same redirects as the
 12 * rest of the kernel when CONFIG_KASAN is enabled, defining e.g. memcpy()
 13 * to __memcpy() but since we are not linking with the main kernel string
 14 * library in the decompressor, that will lead to link failures.
 15 *
 16 * Undefine KASan's versions, define the wrapped functions and alias them to
 17 * the right names so that when e.g. __memcpy() appear in the code, it will
 18 * still be linked to this local version of memcpy().
 19 */
 20#ifdef CONFIG_KASAN
 21#undef memcpy
 22#undef memmove
 23#undef memset
 24void *__memcpy(void *__dest, __const void *__src, size_t __n) __alias(memcpy);
 25void *__memmove(void *__dest, __const void *__src, size_t count) __alias(memmove);
 26void *__memset(void *s, int c, size_t count) __alias(memset);
 27#endif
 28
 29void *memcpy(void *__dest, __const void *__src, size_t __n)
 30{
 31	int i = 0;
 32	unsigned char *d = (unsigned char *)__dest, *s = (unsigned char *)__src;
 33
 34	for (i = __n >> 3; i > 0; i--) {
 35		*d++ = *s++;
 36		*d++ = *s++;
 37		*d++ = *s++;
 38		*d++ = *s++;
 39		*d++ = *s++;
 40		*d++ = *s++;
 41		*d++ = *s++;
 42		*d++ = *s++;
 43	}
 44
 45	if (__n & 1 << 2) {
 46		*d++ = *s++;
 47		*d++ = *s++;
 48		*d++ = *s++;
 49		*d++ = *s++;
 50	}
 51
 52	if (__n & 1 << 1) {
 53		*d++ = *s++;
 54		*d++ = *s++;
 55	}
 56
 57	if (__n & 1)
 58		*d++ = *s++;
 59
 60	return __dest;
 61}
 62
 63void *memmove(void *__dest, __const void *__src, size_t count)
 64{
 65	unsigned char *d = __dest;
 66	const unsigned char *s = __src;
 67
 68	if (__dest == __src)
 69		return __dest;
 70
 71	if (__dest < __src)
 72		return memcpy(__dest, __src, count);
 73
 74	while (count--)
 75		d[count] = s[count];
 76	return __dest;
 77}
 78
 79size_t strlen(const char *s)
 80{
 81	const char *sc = s;
 82
 83	while (*sc != '\0')
 84		sc++;
 85	return sc - s;
 86}
 87
 88size_t strnlen(const char *s, size_t count)
 89{
 90	const char *sc;
 91
 92	for (sc = s; count-- && *sc != '\0'; ++sc)
 93		/* nothing */;
 94	return sc - s;
 95}
 96
 97int memcmp(const void *cs, const void *ct, size_t count)
 98{
 99	const unsigned char *su1 = cs, *su2 = ct, *end = su1 + count;
100	int res = 0;
101
102	while (su1 < end) {
103		res = *su1++ - *su2++;
104		if (res)
105			break;
106	}
107	return res;
108}
109
110int strcmp(const char *cs, const char *ct)
111{
112	unsigned char c1, c2;
113	int res = 0;
114
115	do {
116		c1 = *cs++;
117		c2 = *ct++;
118		res = c1 - c2;
119		if (res)
120			break;
121	} while (c1);
122	return res;
123}
124
125void *memchr(const void *s, int c, size_t count)
126{
127	const unsigned char *p = s;
128
129	while (count--)
130		if ((unsigned char)c == *p++)
131			return (void *)(p - 1);
132	return NULL;
133}
134
135char *strchr(const char *s, int c)
136{
137	while (*s != (char)c)
138		if (*s++ == '\0')
139			return NULL;
140	return (char *)s;
141}
142
143char *strrchr(const char *s, int c)
144{
145	const char *last = NULL;
146	do {
147		if (*s == (char)c)
148			last = s;
149	} while (*s++);
150	return (char *)last;
151}
152
153#undef memset
154
155void *memset(void *s, int c, size_t count)
156{
157	char *xs = s;
158	while (count--)
159		*xs++ = c;
160	return s;
161}