kolibrios/contrib/kolibri-libc/source/stdlib/itoa.c

#include <string.h>
#include <ksys.h>

char *__reverse(char *str)
{
  char tmp, *src, *dst;
  size_t len;
  if (str != NULL){
      len = strlen (str);
      if (len > 1) {
          src = str;
          dst = src + len - 1;
          while (src < dst) {
              tmp = *src;
              *src++ = *dst;
              *dst-- = tmp;
          }
      }
  }
  return str;
}

/* itoa from K&R */
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++] = '-';

    __reverse(s);
    s[i] = '\0';
    return;
}