git.zerfleddert.de Git - proxmark3-svn/blob - armsrc/string.c

   1 /* Implementations of the common string.h functions */
   2 #include "string.h"
   3 #include <stdint.h>
   4
   5 void *memcpy(void *dest, const void *src, int len)
   6 {
   7         uint8_t *d = dest;
   8         const uint8_t *s = src;
   9         while((len--) > 0) {
  10                 *d = *s;
  11                 d++;
  12                 s++;
  13         }
  14         return dest;
  15 }
  16
  17 void *memset(void *dest, int c, int len)
  18 {
  19         uint8_t *d = dest;
  20         while((len--) > 0) {
  21                 *d = c;
  22                 d++;
  23         }
  24         return dest;
  25 }
  26
  27 int memcmp(const void *av, const void *bv, int len)
  28 {
  29         const uint8_t *a = av;
  30         const uint8_t *b = bv;
  31
  32         while((len--) > 0) {
  33                 if(*a != *b) {
  34                         return *a - *b;
  35                 }
  36                 a++;
  37                 b++;
  38         }
  39         return 0;
  40 }
  41
  42 int strlen(const char *str)
  43 {
  44         int l = 0;
  45         while(*str) {
  46                 l++;
  47                 str++;
  48         }
  49         return l;
  50 }
  51
  52 char* strncat(char *dest, const char *src, unsigned int n)
  53 {
  54         unsigned int dest_len = strlen(dest);
  55         unsigned int i;
  56
  57         for (i = 0 ; i < n && src[i] != '\0' ; i++)
  58                 dest[dest_len + i] = src[i];
  59         dest[dest_len + i] = '\0';
  60
  61         return dest;
  62 }