938809f941
POSIX allows these functions to be implemented in a way that the resulting string is stored in the input buffer. Though some may find this annoying, this has the advantage that it makes it possible to implement this function in a thread-safe way. It also means that they can be implemented in a way that they work for paths of arbitrary length, as the output string of these functions is never longer than max(1, len(input)). Portable code already needs to be written with this in mind, so in my opinion it makes very little sense to allow the existing behaviour. Prevent the base system from falling back to this by switching over to POSIX prototypes. I'm not going to bump the __FreeBSD_version for this. The reason is that it's possible to account for this change in a portable way, without depending on a specific version of FreeBSD. An exp-run was done some time ago. As far as I know, all regressions as a result of this have already been fixed. I'll give this change some time to settle. In the long run I want to replace our copies by ones that are thread-safe and don't depend on PATH_MAX/MAXPATHLEN.
80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
/* $OpenBSD: basename.c,v 1.14 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <errno.h>
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#include <libgen.h>
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#include <stdlib.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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basename_r(const char *path, char *bname)
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{
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const char *endp, *startp;
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size_t len;
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/* Empty or NULL string gets treated as "." */
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if (path == NULL || *path == '\0') {
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bname[0] = '.';
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bname[1] = '\0';
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return (bname);
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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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/* All slashes becomes "/" */
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if (endp == path && *endp == '/') {
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bname[0] = '/';
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bname[1] = '\0';
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return (bname);
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}
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/* Find the start of the base */
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startp = endp;
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while (startp > path && *(startp - 1) != '/')
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startp--;
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len = endp - startp + 1;
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if (len >= MAXPATHLEN) {
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errno = ENAMETOOLONG;
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return (NULL);
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}
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memcpy(bname, startp, len);
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bname[len] = '\0';
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return (bname);
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}
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char *
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basename(char *path)
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{
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static char *bname = NULL;
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if (bname == NULL) {
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bname = (char *)malloc(MAXPATHLEN);
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if (bname == NULL)
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return (NULL);
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}
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return (basename_r(path, bname));
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}
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