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73 lines
1.9 KiB
73 lines
1.9 KiB
4 months ago
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/* $OpenBSD: dirname.c,v 1.13 2005/08/08 08:05:33 espie Exp $ */
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/*
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* Copyright (c) 1997, 2004 Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* OPENBSD ORIGINAL: lib/libc/gen/dirname.c */
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#include "includes.h"
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#ifndef HAVE_DIRNAME
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#include <errno.h>
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#include <string.h>
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#include <sys/param.h>
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char *
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dirname(const char *path)
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{
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static char dname[MAXPATHLEN];
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size_t len;
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const char *endp;
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/* Empty or NULL string gets treated as "." */
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if (path == NULL || *path == '\0') {
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dname[0] = '.';
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dname[1] = '\0';
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return (dname);
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}
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/* Strip any trailing slashes */
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endp = path + strlen(path) - 1;
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while (endp > path && *endp == '/')
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endp--;
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/* Find the start of the dir */
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while (endp > path && *endp != '/')
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endp--;
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/* Either the dir is "/" or there are no slashes */
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if (endp == path) {
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dname[0] = *endp == '/' ? '/' : '.';
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dname[1] = '\0';
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return (dname);
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} else {
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/* Move forward past the separating slashes */
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do {
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endp--;
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} while (endp > path && *endp == '/');
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}
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len = endp - path + 1;
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if (len >= sizeof(dname)) {
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errno = ENAMETOOLONG;
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return (NULL);
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}
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memcpy(dname, path, len);
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dname[len] = '\0';
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return (dname);
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}
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#endif
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