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

/*	$OpenBSD: strlcpy.c,v 1.8 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 "includes.h"
#ifndef HAVE_STRLCPY

#if defined(LIBC_SCCS) && !defined(lint)
static char *rcsid = "$OpenBSD: strlcpy.c,v 1.8 2003/06/17 21:56:24 millert Exp $";
#endif /* LIBC_SCCS and not lint */

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

/*
 * Copy src to string dst of size siz.  At most siz-1 characters
 * will be copied.  Always NUL terminates (unless siz == 0).
 * Returns strlen(src); if retval >= siz, truncation occurred.
 */
size_t
strlcpy(char *dst, const char *src, size_t siz)
{
	register char *d = dst;
	register const char *s = src;
	register size_t n = siz;

	/* Copy as many bytes as will fit */
	if (n != 0 && --n != 0) {
		do {
			if ((*d++ = *s++) == 0)
				break;
		} while (--n != 0);
	}

	/* Not enough room in dst, add NUL and traverse rest of src */
	if (n == 0) {
		if (siz != 0)
			*d = '\0';		/* NUL-terminate dst */
		while (*s++)
			;
	}

	return(s - src - 1);	/* count does not include NUL */
}

#endif /* !HAVE_STRLCPY */
Commit	Line	Data
510a42ce	1	/* $OpenBSD: strlcpy.c,v 1.8 2003/06/17 21:56:24 millert Exp $ */
8efc0c15	2
	3	/*
	4	* Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
8efc0c15	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.
8efc0c15	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.
8efc0c15	17	*/
8efc0c15	18
17962c40	19	#include "includes.h"
beb43d31	20	#ifndef HAVE_STRLCPY
beb43d31	21
8efc0c15	22	#if defined(LIBC_SCCS) && !defined(lint)
510a42ce	23	static char *rcsid = "$OpenBSD: strlcpy.c,v 1.8 2003/06/17 21:56:24 millert Exp $";
8efc0c15	24	#endif /* LIBC_SCCS and not lint */
	25
	26	#include <sys/types.h>
	27	#include <string.h>
	28
	29	/*
	30	* Copy src to string dst of size siz. At most siz-1 characters
	31	* will be copied. Always NUL terminates (unless siz == 0).
	32	* Returns strlen(src); if retval >= siz, truncation occurred.
	33	*/
f11065cb	34	size_t
bffa6723	35	strlcpy(char dst, const char src, size_t siz)
8efc0c15	36	{
	37	register char *d = dst;
	38	register const char *s = src;
	39	register size_t n = siz;
	40
	41	/* Copy as many bytes as will fit */
	42	if (n != 0 && --n != 0) {
	43	do {
	44	if ((d++ = s++) == 0)
	45	break;
	46	} while (--n != 0);
	47	}
	48
	49	/* Not enough room in dst, add NUL and traverse rest of src */
	50	if (n == 0) {
	51	if (siz != 0)
	52	d = '\0'; / NUL-terminate dst */
	53	while (*s++)
	54	;
	55	}
	56
	57	return(s - src - 1); /* count does not include NUL */
	58	}
fb723d82	59
fb723d82	60	#endif /* !HAVE_STRLCPY */