[openssh.git] / openbsd-compat / strlcat.c

/*	$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.
 */

/* OPENBSD ORIGINAL: lib/libc/string/strlcat.c */

#include "includes.h"
#ifndef HAVE_STRLCAT

#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 */
}

#endif /* !HAVE_STRLCAT */
Commit	Line	Data
432e59f9	1	/* $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $ */
b09a984b	2
	3	/*
	4	* Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
b09a984b	5	*
bffa6723	6	* Permission to use, copy, modify, and distribute this software for any
	7	* purpose with or without fee is hereby granted, provided that the above
	8	* copyright notice and this permission notice appear in all copies.
b09a984b	9	*
510a42ce	10	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	11	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	12	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	13	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	14	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	15	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	16	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
b09a984b	17	*/
b09a984b	18
f6d4fb87	19	/* OPENBSD ORIGINAL: lib/libc/string/strlcat.c */
f6d4fb87	20
17962c40	21	#include "includes.h"
b09a984b	22	#ifndef HAVE_STRLCAT
b09a984b	23
b09a984b	24	#include <sys/types.h>
	25	#include <string.h>
	26
	27	/*
	28	* Appends src to string dst of size siz (unlike strncat, siz is the
	29	* full size of dst, not space left). At most siz-1 characters
e400a640	30	* will be copied. Always NUL terminates (unless siz <= strlen(dst)).
f11065cb	31	* Returns strlen(src) + MIN(siz, strlen(initial dst)).
f11065cb	32	* If retval >= siz, truncation occurred.
b09a984b	33	*/
f11065cb	34	size_t
bffa6723	35	strlcat(char dst, const char src, size_t siz)
b09a984b	36	{
432e59f9	37	char *d = dst;
	38	const char *s = src;
	39	size_t n = siz;
b09a984b	40	size_t dlen;
	41
	42	/* Find the end of dst and adjust bytes left but don't go past end */
e400a640	43	while (n-- != 0 && *d != '\0')
b09a984b	44	d++;
	45	dlen = d - dst;
	46	n = siz - dlen;
	47
	48	if (n == 0)
	49	return(dlen + strlen(s));
	50	while (*s != '\0') {
	51	if (n != 1) {
	52	d++ = s;
	53	n--;
	54	}
	55	s++;
	56	}
	57	*d = '\0';
	58
	59	return(dlen + (s - src)); /* count does not include NUL */
	60	}
	61
	62	#endif /* !HAVE_STRLCAT */