/*---------------------------------------------------------------------
  I use the strl* functions for extracting and copying strings. These
  are present in the BSD systems I use mostly, but are missing on
  Linux, AIX, HP-UX, and maybe others. For this reason, I include
  copies here.

  Copyright (c) 1998, 2015 Todd C. Miller <Todd.Miller@courtesan.com>
 
  Permission to use, copy, modify, and distribute this software for any
  purpose with or without fee is hereby granted, provided that the above
  copyright notice and this permission notice appear in all copies.
 
  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  --------------------------------------------------------------------*/

size_t bsd_strlcat(char *dst, const char *src, size_t dsize) {
  const char *odst = dst;
  const char *osrc = src;
  size_t n = dsize;
  size_t dlen;

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

  if (n-- == 0)
    return(dlen + strlen(src));
  while (*src != '\0') {
    if (n != 0) {
      *dst++ = *src;
      n--;
    }
    src++;
  }
  *dst = '\0';
  return(dlen + (src - osrc));	/* count does not include NUL */
}

size_t bsd_strlcpy(char *dst, const char *src, size_t dsize) {
  const char *osrc = src;
  size_t nleft = dsize;

  /* Copy as many bytes as will fit. */
  if (nleft != 0) {
    while (--nleft != 0) {
      if ((*dst++ = *src++) == '\0')
        break;
    }
  }

  /* Not enough room in dst, add NUL and traverse rest of src. */
  if (nleft == 0) {
    if (dsize != 0)
      *dst = '\0';		/* NUL-terminate dst */
    while (*src++)
      ;
  }
  return(src - osrc - 1);	/* count does not include NUL */
}