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}
128