ossp-pkg/path/path_dirname.c
1.1.1.1
/*-
* Copyright (c) 2000 Chris Costello <chris@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <errno.h>
#include <string.h>
#include "path.h"
char *
path_dirname(
char *outbuf,
size_t outsize,
const char *path)
{
const char *cp;
int n;
/* argument consistency check */
if (path == NULL || path[0] == '\0')
return (strncpy(outbuf, ".", outsize));
/* skip trailing slashes */
cp = path + strlen(path) - 1;
for (; cp > path && *cp == '/'; cp--)
;
if (cp == path)
return (strncpy(outbuf, "/", outsize));
/* skip last path component */
for (; cp > path && *cp != '/'; cp--)
;
if (cp == path && *cp != '/')
return (strncpy(outbuf, ".", outsize));
/* skip slashes off before the final path component */
for (; cp > path && *cp == '/'; cp--)
;
/* copy directory to output buffer */
n = cp - path + 1;
if (n > MAXPATHLEN)
n = MAXPATHLEN;
strncpy(outbuf, path, n);
outbuf[n] = '\0';
return outbuf;
}
