proxmark3/armsrc/string.c

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//-----------------------------------------------------------------------------
// Jonathan Westhues, Sept 2005
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// Common string.h functions
//-----------------------------------------------------------------------------
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#include "string.h"
#include <stdint.h>
void *memcpy(void *dest, const void *src, int len)
{
uint8_t *d = dest;
const uint8_t *s = src;
while((len--) > 0) {
*d = *s;
d++;
s++;
}
return dest;
}
void *memset(void *dest, int c, int len)
{
uint8_t *d = dest;
while((len--) > 0) {
*d = c;
d++;
}
return dest;
}
int memcmp(const void *av, const void *bv, int len)
{
const uint8_t *a = av;
const uint8_t *b = bv;
while((len--) > 0) {
if(*a != *b) {
return *a - *b;
}
a++;
b++;
}
return 0;
}
void memxor(uint8_t * dest, uint8_t * src, size_t len) {
for( ; len > 0; len--,dest++,src++)
*dest ^= *src;
}
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int strlen(const char *str)
{
int l = 0;
while(*str) {
l++;
str++;
}
return l;
}
char* strncat(char *dest, const char *src, unsigned int n)
{
unsigned int dest_len = strlen(dest);
unsigned int i;
for (i = 0 ; i < n && src[i] != '\0' ; i++)
dest[dest_len + i] = src[i];
dest[dest_len + i] = '\0';
return dest;
}
char* strcat(char *dest, const char *src)
{
unsigned int dest_len = strlen(dest);
unsigned int i;
for (i = 0 ; src[i] != '\0' ; i++)
dest[dest_len + i] = src[i];
dest[dest_len + i] = '\0';
return dest;
}
////////////////////////////////////////// code to do 'itoa'
/* reverse: reverse string s in place */
void strreverse(char s[])
{
int c, i, j;
for (i = 0, j = strlen(s)-1; i<j; i++, j--) {
c = s[i];
s[i] = s[j];
s[j] = c;
}
}
/* itoa: convert n to characters in s */
void itoa(int n, char s[])
{
int i, sign;
if ((sign = n) < 0) /* record sign */
n = -n; /* make n positive */
i = 0;
do { /* generate digits in reverse order */
s[i++] = n % 10 + '0'; /* get next digit */
} while ((n /= 10) > 0); /* delete it */
if (sign < 0)
s[i++] = '-';
s[i] = '\0';
strreverse(s);
}
//////////////////////////////////////// END 'itoa' CODE