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
 68int memcmp(const void *cs, const void *ct, size_t count)
 69{
 70	const unsigned char *su1 = cs, *su2 = ct, *end = su1 + count;
 71	int res = 0;
 72
 73	while (su1 < end) {
 74		res = *su1++ - *su2++;
 75		if (res)
 76			break;
 77	}
 78	return res;
 79}
 80
 81int strcmp(const char *cs, const char *ct)
 82{
 83	unsigned char c1, c2;
 84	int res = 0;
 85
 86	do {
 87		c1 = *cs++;
 88		c2 = *ct++;
 89		res = c1 - c2;
 90		if (res)
 91			break;
 92	} while (c1);
 93	return res;
 94}
 95
 96void *memchr(const void *s, int c, size_t count)
 97{
 98	const unsigned char *p = s;
 99
100	while (count--)
101		if ((unsigned char)c == *p++)
102			return (void *)(p - 1);
103	return NULL;
104}
105
106char *strchr(const char *s, int c)
107{
108	while (*s != (char)c)
109		if (*s++ == '\0')
110			return NULL;
111	return (char *)s;
112}
113
114#undef memset
115
116void *memset(void *s, int c, size_t count)
117{
118	char *xs = s;
119	while (count--)
120		*xs++ = c;
121	return s;
122}
123
124void __memzero(void *s, size_t count)
125{
126	memset(s, 0, count);
127}