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ADD: 'hf emv' - from @peterfillmore emv fork. A bit cleaned up and moved around...
[proxmark3-svn] / armsrc / string.c
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 #include "string.h"
11
12 void *memcpy(void *dest, const void *src, int len)
13 {
14 uint8_t *d = dest;
15 const uint8_t *s = src;
16 while((len--) > 0) {
17 *d = *s;
18 d++;
19 s++;
20 }
21 return dest;
22 }
23
24 void *memset(void *dest, int c, int len)
25 {
26 uint8_t *d = dest;
27 while((len--) > 0) {
28 *d = c;
29 d++;
30 }
31 return dest;
32 }
33
34 int memcmp(const void *av, const void *bv, int len)
35 {
36 const uint8_t *a = av;
37 const uint8_t *b = bv;
38
39 while((len--) > 0) {
40 if(*a != *b) {
41 return *a - *b;
42 }
43 a++;
44 b++;
45 }
46 return 0;
47 }
48
49 void memxor(uint8_t * dest, uint8_t * src, size_t len) {
50 for( ; len > 0; len--,dest++,src++)
51 *dest ^= *src;
52 }
53
54 int strlen(const char *str)
55 {
56 int l = 0;
57 while(*str) {
58 l++;
59 str++;
60 }
61 return l;
62 }
63
64 char* strncat(char *dest, const char *src, unsigned int n)
65 {
66 unsigned int dest_len = strlen(dest);
67 unsigned int i;
68
69 for (i = 0 ; i < n && src[i] != '\0' ; i++)
70 dest[dest_len + i] = src[i];
71 dest[dest_len + i] = '\0';
72
73 return dest;
74 }
75
76 char* strcat(char *dest, const char *src)
77 {
78 unsigned int dest_len = strlen(dest);
79 unsigned int i;
80
81 for (i = 0 ; src[i] != '\0' ; i++)
82 dest[dest_len + i] = src[i];
83 dest[dest_len + i] = '\0';
84
85 return dest;
86 }
87 ////////////////////////////////////////// code to do 'itoa'
88
89 /* reverse: reverse string s in place */
90 void strreverse(char s[])
91 {
92 int c, i, j;
93
94 for (i = 0, j = strlen(s)-1; i<j; i++, j--) {
95 c = s[i];
96 s[i] = s[j];
97 s[j] = c;
98 }
99 }
100
101 /* itoa: convert n to characters in s */
102 void itoa(int n, char s[])
103 {
104 int i, sign;
105
106 if ((sign = n) < 0) /* record sign */
107 n = -n; /* make n positive */
108 i = 0;
109 do { /* generate digits in reverse order */
110 s[i++] = n % 10 + '0'; /* get next digit */
111 } while ((n /= 10) > 0); /* delete it */
112 if (sign < 0)
113 s[i++] = '-';
114 s[i] = '\0';
115 strreverse(s);
116 }
117
118 //////////////////////////////////////// END 'itoa' CODE
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