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

/*	$OpenBSD: basename.c,v 1.14 2005/08/08 08:05:33 espie Exp $	*/

/*
 * Copyright (c) 1997, 2004 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/gen/basename.c */

#include "includes.h"
#ifndef HAVE_BASENAME
#include <errno.h>
#include <string.h>

char *
basename(const char *path)
{
	static char bname[MAXPATHLEN];
	size_t len;
	const char *endp, *startp;

	/* Empty or NULL string gets treated as "." */
	if (path == NULL || *path == '\0') {
		bname[0] = '.';
		bname[1] = '\0';
		return (bname);
	}

	/* Strip any trailing slashes */
	endp = path + strlen(path) - 1;
	while (endp > path && *endp == '/')
		endp--;

	/* All slashes becomes "/" */
	if (endp == path && *endp == '/') {
		bname[0] = '/';
		bname[1] = '\0';
		return (bname);
	}

	/* Find the start of the base */
	startp = endp;
	while (startp > path && *(startp - 1) != '/')
		startp--;

	len = endp - startp + 1;
	if (len >= sizeof(bname)) {
		errno = ENAMETOOLONG;
		return (NULL);
	}
	memcpy(bname, startp, len);
	bname[len] = '\0';
	return (bname);
}

#endif /* !defined(HAVE_BASENAME) */
Commit	Line	Data
7dfb4a82	1	/* $OpenBSD: basename.c,v 1.14 2005/08/08 08:05:33 espie Exp $ */
2d0c443a	2
2d0c443a	3	/*
7dfb4a82	4	* Copyright (c) 1997, 2004 Todd C. Miller <Todd.Miller@courtesan.com>
2d0c443a	5	*
510a42ce	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.
2d0c443a	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.
2d0c443a	17	*/
2d0c443a	18
f6d4fb87	19	/* OPENBSD ORIGINAL: lib/libc/gen/basename.c */
f6d4fb87	20
510a42ce	21	#include "includes.h"
510a42ce	22	#ifndef HAVE_BASENAME
48a7de26	23	#include <errno.h>
e204f3ee	24	#include <string.h>
2d0c443a	25
2d0c443a	26	char *
	27	basename(const char *path)
	28	{
	29	static char bname[MAXPATHLEN];
7dfb4a82	30	size_t len;
7dfb4a82	31	const char endp, startp;
2d0c443a	32
	33	/* Empty or NULL string gets treated as "." */
	34	if (path == NULL \|\| *path == '\0') {
7dfb4a82	35	bname[0] = '.';
	36	bname[1] = '\0';
	37	return (bname);
2d0c443a	38	}
2d0c443a	39
7dfb4a82	40	/* Strip any trailing slashes */
2d0c443a	41	endp = path + strlen(path) - 1;
	42	while (endp > path && *endp == '/')
	43	endp--;
	44
7dfb4a82	45	/* All slashes becomes "/" */
2d0c443a	46	if (endp == path && *endp == '/') {
7dfb4a82	47	bname[0] = '/';
	48	bname[1] = '\0';
	49	return (bname);
2d0c443a	50	}
	51
	52	/* Find the start of the base */
	53	startp = endp;
	54	while (startp > path && *(startp - 1) != '/')
	55	startp--;
	56
7dfb4a82	57	len = endp - startp + 1;
7dfb4a82	58	if (len >= sizeof(bname)) {
2d0c443a	59	errno = ENAMETOOLONG;
7dfb4a82	60	return (NULL);
2d0c443a	61	}
7dfb4a82	62	memcpy(bname, startp, len);
	63	bname[len] = '\0';
	64	return (bname);
2d0c443a	65	}
	66
	67	#endif /* !defined(HAVE_BASENAME) */