1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
#include <string.h>
#include <malloc.h>
size_t strlen(const char* str) {
size_t ret = 0;
while (str[ret] != 0)
ret++;
return ret;
}
char *strchr(const char *str, char c) {
do {
if (*str == c) return (char*)str;
} while (*(str++));
return NULL;
}
char *strrchr(const char *str, char c) {
char* ret = NULL;
do {
if (*str == c) ret = (char*)str;
} while (*(str++));
return ret;
}
char *strcpy(char *dest, const char *src) {
memcpy(dest, src, strlen(src) + 1);
return (char*)dest;
}
char *strncpy(char *dest, const char *src, size_t n) {
size_t x = strlen(src + 1);
if (n < x) x = n;
memcpy(dest, src, x);
if (n > x) memset(dest + x, 0, n - x);
return (char*)dest;
}
char *strcat(char *dest, const char *src) {
char *dest2 = dest;
dest2 += strlen(dest) - 1;
while (*src) {
*dest2 = *src;
src++;
dest2++;
}
*dest2 = 0;
return dest;
}
int strcmp(const char *s1, const char *s2) {
while ((*s1) && (*s1 == *s2)) {
s1++;
s2++;
}
return (*(unsigned char*)s1 - *(unsigned char*)s2);
}
int strncmp(const char *s1, const char *s2, size_t n) {
size_t i = 0;
while ((*s1) && (*s1 == *s2) && i != n) {
s1++;
s2++;
i++;
}
return (*(unsigned char*)s1 - *(unsigned char*)s2);
}
void *memcpy(void *vd, const void *vs, size_t count) {
uint8_t *dest = (uint8_t*)vd, *src = (uint8_t*)vs;
size_t f = count % 4, n = count / 4, i;
const uint32_t* s = (uint32_t*)src;
uint32_t* d = (uint32_t*)dest;
for (i = 0; i < n; i++) {
d[i] = s[i];
}
if (f != 0) {
for (i = count - f; i < count; i++) {
dest[i] = src[i];
}
}
return vd;
}
void *memmove(void *vd, const void *vs, size_t count) {
uint8_t *dest = (uint8_t*)vd, *src = (uint8_t*)vs;
if (vd < vs) {
for (size_t i = 0; i < count; i++)
dest[i] = src[i];
} else {
for (size_t i = 0; i < count; i++)
dest[count - i] = src[count - i];
}
return vd;
}
int memcmp(const void *va, const void *vb, size_t count) {
uint8_t *a = (uint8_t*)va;
uint8_t *b = (uint8_t*)vb;
for (size_t i = 0; i < count; i++) {
if (a[i] != b[i]) return (int)a[i] - (int)b[i];
}
return 0;
}
void *memset(void *dest, int val, size_t count) {
uint8_t *dest_c = (uint8_t*)dest;
for (size_t i = 0; i < count; i++) {
dest_c[i] = val;
}
return dest;
}
char *strdup(const char* str) {
int len = strlen(str) + 1;
char* ret = (char*)malloc(len);
if (ret == 0) return 0;
memcpy(ret, str, len);
return ret;
}
/* vim: set ts=4 sw=4 tw=0 noet :*/
|
