bd20f8f4 |
1 | //----------------------------------------------------------------------------- |
2 | // Jonathan Westhues, Sept 2005 |
3 | // |
4 | // This code is licensed to you under the terms of the GNU GPL, version 2 or, |
5 | // at your option, any later version. See the LICENSE.txt file for the text of |
6 | // the license. |
7 | //----------------------------------------------------------------------------- |
8 | // Common string.h functions |
9 | //----------------------------------------------------------------------------- |
10 | |
9ab7a6c7 |
11 | #include "string.h" |
12 | #include <stdint.h> |
13 | |
14 | void *memcpy(void *dest, const void *src, int len) |
15 | { |
16 | uint8_t *d = dest; |
17 | const uint8_t *s = src; |
18 | while((len--) > 0) { |
19 | *d = *s; |
20 | d++; |
21 | s++; |
22 | } |
23 | return dest; |
24 | } |
25 | |
26 | void *memset(void *dest, int c, int len) |
27 | { |
28 | uint8_t *d = dest; |
29 | while((len--) > 0) { |
30 | *d = c; |
31 | d++; |
32 | } |
33 | return dest; |
34 | } |
35 | |
36 | int memcmp(const void *av, const void *bv, int len) |
37 | { |
38 | const uint8_t *a = av; |
39 | const uint8_t *b = bv; |
40 | |
41 | while((len--) > 0) { |
42 | if(*a != *b) { |
43 | return *a - *b; |
44 | } |
45 | a++; |
46 | b++; |
47 | } |
48 | return 0; |
49 | } |
50 | |
52ab55ab |
51 | void memxor(uint8_t * dest, uint8_t * src, size_t len) { |
52 | for( ; len > 0; len--,dest++,src++) |
53 | *dest ^= *src; |
54 | } |
55 | |
9ab7a6c7 |
56 | int strlen(const char *str) |
57 | { |
58 | int l = 0; |
59 | while(*str) { |
60 | l++; |
61 | str++; |
62 | } |
63 | return l; |
64 | } |
65 | |
66 | char* strncat(char *dest, const char *src, unsigned int n) |
67 | { |
68 | unsigned int dest_len = strlen(dest); |
69 | unsigned int i; |
70 | |
71 | for (i = 0 ; i < n && src[i] != '\0' ; i++) |
72 | dest[dest_len + i] = src[i]; |
73 | dest[dest_len + i] = '\0'; |
74 | |
75 | return dest; |
76 | } |
9455b51c |
77 | |
78 | char* strcat(char *dest, const char *src) |
79 | { |
80 | unsigned int dest_len = strlen(dest); |
81 | unsigned int i; |
82 | |
83 | for (i = 0 ; src[i] != '\0' ; i++) |
84 | dest[dest_len + i] = src[i]; |
85 | dest[dest_len + i] = '\0'; |
86 | |
87 | return dest; |
88 | } |
89 | ////////////////////////////////////////// code to do 'itoa' |
90 | |
91 | /* reverse: reverse string s in place */ |
92 | void strreverse(char s[]) |
93 | { |
94 | int c, i, j; |
95 | |
96 | for (i = 0, j = strlen(s)-1; i<j; i++, j--) { |
97 | c = s[i]; |
98 | s[i] = s[j]; |
99 | s[j] = c; |
100 | } |
101 | } |
102 | |
103 | /* itoa: convert n to characters in s */ |
104 | void itoa(int n, char s[]) |
105 | { |
106 | int i, sign; |
107 | |
108 | if ((sign = n) < 0) /* record sign */ |
109 | n = -n; /* make n positive */ |
110 | i = 0; |
111 | do { /* generate digits in reverse order */ |
112 | s[i++] = n % 10 + '0'; /* get next digit */ |
113 | } while ((n /= 10) > 0); /* delete it */ |
114 | if (sign < 0) |
115 | s[i++] = '-'; |
116 | s[i] = '\0'; |
117 | strreverse(s); |
118 | } |
119 | |
120 | //////////////////////////////////////// END 'itoa' CODE |