Colony » Colony Scout

/*        $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie 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 <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)

{

        char *d = dst;

        const char *s = src;

        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 */

}