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