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strlcat.c

/*    $OpenBSD: strlcat.c,v 1.11 2003/06/17 21:56:24 millert Exp $      */

/*
 * Copyright (c) 1998 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.
 */

#include "config.h"
#ifndef HAVE_STRLCAT

#if defined(LIBC_SCCS) && !defined(lint)
static char *rcsid = "$OpenBSD: strlcat.c,v 1.11 2003/06/17 21:56:24 millert Exp $";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <string.h>

/*
 * 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.
 */
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


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