Function strlcat

mapstring.c:141–166

* Appends src to string dst of size siz (unlike strncat, siz is the * full size of dst, not space left). At most siz-1 characters * will be copied. Always NUL terminates (unless siz <= strlen(dst)). * Returns strlen(src) + MIN(siz, strlen(initial dst)). * If retval >= siz, truncation occurred. */

 * If retval >= siz, truncation occurred.
 */
size_t strlcat(char *dst, const char *src, size_t siz)
{
  register char *d = dst;
  register const char *s = src;
  register size_t n = siz;
  size_t dlen;

  /* Find the end of dst and adjust bytes left but don't go past end */
  while (n-- != 0 && *d != '\0')
    d++;
  dlen = d - dst;
  n = siz - dlen;

  if (n == 0)
    return(dlen + strlen(s));
  while (*s != '\0') {
    if (n != 1) {
      *d++ = *s;
      n--;
    }
    s++;
  }
  *d = '\0';

  return(dlen + (s - src));/* count does not include NUL */
}
#endif

#ifdef NEED_STRLCPY