/*  $OpenBSD: pcap_strlcpy.c,v 1.12 2015/01/15 03:54:12 millert Exp $ */

/*

 * 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.

 */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <stddef.h>

#include <string.h>

#include "portability.h"

/*

 * Copy string src to buffer dst of size dsize.  At most dsize-1

 * chars will be copied.  Always NUL terminates (unless dsize == 0).

 * Returns strlen(src); if retval >= dsize, truncation occurred.

 */

size_t

pcap_strlcpy(char * restrict dst, const char * restrict 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 */

}