1 /*
2 * arch/arm/boot/compressed/string.c
3 *
4 * Small subset of simple string routines
5 */
6
7 #include <linux/string.h>
8
memcpy(void * __dest,__const void * __src,size_t __n)9 void *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
memmove(void * __dest,__const void * __src,size_t count)43 void *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
strlen(const char * s)59 size_t strlen(const char *s)
60 {
61 const char *sc = s;
62
63 while (*sc != '\0')
64 sc++;
65 return sc - s;
66 }
67
strnlen(const char * s,size_t count)68 size_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
memcmp(const void * cs,const void * ct,size_t count)77 int 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
strcmp(const char * cs,const char * ct)90 int 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
memchr(const void * s,int c,size_t count)105 void *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
strchr(const char * s,int c)115 char *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
memset(void * s,int c,size_t count)125 void *memset(void *s, int c, size_t count)
126 {
127 char *xs = s;
128 while (count--)
129 *xs++ = c;
130 return s;
131 }
132
__memzero(void * s,size_t count)133 void __memzero(void *s, size_t count)
134 {
135 memset(s, 0, count);
136 }
137