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

/*	$OpenBSD: strlcat.c,v 1.10 2003/04/12 21:56:39 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 TODD C. MILLER DISCLAIMS ALL
 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER 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 "includes.h"
#ifndef HAVE_STRLCAT

#if defined(LIBC_SCCS) && !defined(lint)
static char *rcsid = "$OpenBSD: strlcat.c,v 1.10 2003/04/12 21:56:39 millert Exp $";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <string.h>
#include "strlcat.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 /* !HAVE_STRLCAT */
Commit	Line	Data
bffa6723	1	/* $OpenBSD: strlcat.c,v 1.10 2003/04/12 21:56:39 millert 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	*
bffa6723	10	* THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL
	11	* WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
	12	* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE
	13	* FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	14	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
	15	* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
	16	* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
b09a984b	17	*/
b09a984b	18
17962c40	19	#include "includes.h"
b09a984b	20	#ifndef HAVE_STRLCAT
	21
	22	#if defined(LIBC_SCCS) && !defined(lint)
bffa6723	23	static char *rcsid = "$OpenBSD: strlcat.c,v 1.10 2003/04/12 21:56:39 millert Exp $";
b09a984b	24	#endif /* LIBC_SCCS and not lint */
	25
	26	#include <sys/types.h>
	27	#include <string.h>
d60382e0	28	#include "strlcat.h"
b09a984b	29
	30	/*
	31	* Appends src to string dst of size siz (unlike strncat, siz is the
	32	* full size of dst, not space left). At most siz-1 characters
e400a640	33	* will be copied. Always NUL terminates (unless siz <= strlen(dst)).
f11065cb	34	* Returns strlen(src) + MIN(siz, strlen(initial dst)).
f11065cb	35	* If retval >= siz, truncation occurred.
b09a984b	36	*/
f11065cb	37	size_t
bffa6723	38	strlcat(char dst, const char src, size_t siz)
b09a984b	39	{
	40	register char *d = dst;
	41	register const char *s = src;
	42	register size_t n = siz;
	43	size_t dlen;
	44
	45	/* Find the end of dst and adjust bytes left but don't go past end */
e400a640	46	while (n-- != 0 && *d != '\0')
b09a984b	47	d++;
	48	dlen = d - dst;
	49	n = siz - dlen;
	50
	51	if (n == 0)
	52	return(dlen + strlen(s));
	53	while (*s != '\0') {
	54	if (n != 1) {
	55	d++ = s;
	56	n--;
	57	}
	58	s++;
	59	}
	60	*d = '\0';
	61
	62	return(dlen + (s - src)); /* count does not include NUL */
	63	}
	64
	65	#endif /* !HAVE_STRLCAT */