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

/*	$OpenBSD: basename.c,v 1.11 2003/06/17 21:56:23 millert Exp $	*/

/*
 * Copyright (c) 1997 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_BASENAME

#ifndef lint
static char rcsid[] = "$OpenBSD: basename.c,v 1.11 2003/06/17 21:56:23 millert Exp $";
#endif /* not lint */

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

	/* Empty or NULL string gets treated as "." */
	if (path == NULL || *path == '\0') {
		(void)strlcpy(bname, ".", sizeof bname);
		return(bname);
	}

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

	/* All slashes become "/" */
	if (endp == path && *endp == '/') {
		(void)strlcpy(bname, "/", sizeof bname);
		return(bname);
	}

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

	if (endp - startp + 2 > sizeof(bname)) {
		errno = ENAMETOOLONG;
		return(NULL);
	}
	strlcpy(bname, startp, endp - startp + 2);
	return(bname);
}

#endif /* !defined(HAVE_BASENAME) */
Commit	Line	Data
510a42ce	1	/* $OpenBSD: basename.c,v 1.11 2003/06/17 21:56:23 millert Exp $ */
2d0c443a	2
	3	/*
	4	* Copyright (c) 1997 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
510a42ce	19	#include "includes.h"
510a42ce	20	#ifndef HAVE_BASENAME
2d0c443a	21
2d0c443a	22	#ifndef lint
510a42ce	23	static char rcsid[] = "$OpenBSD: basename.c,v 1.11 2003/06/17 21:56:23 millert Exp $";
2d0c443a	24	#endif /* not lint */
	25
	26	char *
	27	basename(const char *path)
	28	{
	29	static char bname[MAXPATHLEN];
	30	register const char endp, startp;
	31
	32	/* Empty or NULL string gets treated as "." */
	33	if (path == NULL \|\| *path == '\0') {
	34	(void)strlcpy(bname, ".", sizeof bname);
	35	return(bname);
	36	}
	37
	38	/* Strip trailing slashes */
	39	endp = path + strlen(path) - 1;
	40	while (endp > path && *endp == '/')
	41	endp--;
	42
	43	/* All slashes become "/" */
	44	if (endp == path && *endp == '/') {
	45	(void)strlcpy(bname, "/", sizeof bname);
	46	return(bname);
	47	}
	48
	49	/* Find the start of the base */
	50	startp = endp;
	51	while (startp > path && *(startp - 1) != '/')
	52	startp--;
	53
	54	if (endp - startp + 2 > sizeof(bname)) {
	55	errno = ENAMETOOLONG;
	56	return(NULL);
	57	}
	58	strlcpy(bname, startp, endp - startp + 2);
	59	return(bname);
	60	}
	61
	62	#endif /* !defined(HAVE_BASENAME) */