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

/*	$OpenBSD: strlcpy.c,v 1.10 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/strlcpy.c */

#include "includes.h"
#ifndef HAVE_STRLCPY

#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)
{
	char *d = dst;
	const char *s = src;
	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
e4f65477	1	/* $OpenBSD: strlcpy.c,v 1.10 2005/08/08 08:05:37 espie 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
f6d4fb87	19	/* OPENBSD ORIGINAL: lib/libc/string/strlcpy.c */
f6d4fb87	20
17962c40	21	#include "includes.h"
beb43d31	22	#ifndef HAVE_STRLCPY
beb43d31	23
8efc0c15	24	#include <sys/types.h>
	25	#include <string.h>
	26
	27	/*
	28	* Copy src to string dst of size siz. At most siz-1 characters
	29	* will be copied. Always NUL terminates (unless siz == 0).
	30	* Returns strlen(src); if retval >= siz, truncation occurred.
	31	*/
f11065cb	32	size_t
bffa6723	33	strlcpy(char dst, const char src, size_t siz)
8efc0c15	34	{
e4f65477	35	char *d = dst;
	36	const char *s = src;
	37	size_t n = siz;
8efc0c15	38
	39	/* Copy as many bytes as will fit */
	40	if (n != 0 && --n != 0) {
	41	do {
	42	if ((d++ = s++) == 0)
	43	break;
	44	} while (--n != 0);
	45	}
	46
	47	/* Not enough room in dst, add NUL and traverse rest of src */
	48	if (n == 0) {
	49	if (siz != 0)
	50	d = '\0'; / NUL-terminate dst */
	51	while (*s++)
	52	;
	53	}
	54
	55	return(s - src - 1); /* count does not include NUL */
	56	}
fb723d82	57
fb723d82	58	#endif /* !HAVE_STRLCPY */