mirror of
https://https.git.savannah.gnu.org/git/gnulib.git
synced 2026-06-15 23:35:50 +00:00
Paul Eggert
0632e11574
longer worry about uses that don't define HAVE_CONFIG_H. * acl.c, alloca.c, argmatch.c, atexit.c, backupfile.c: * basename.c, c-stack.c, c-strtod.c, calloc.c, canon-host.c: * canonicalize.c, chdir-long.c, chdir-safer.c, chown.c: * cloexec.c, close-stream.c, closeout.c, creat-safer.c: * cycle-check.c, diacrit.c, dirchownmod.c, dirfd.c, dirname.c: * dup-safer.c, dup2.c, error.c, euidaccess.c, exclude.c: * exitfail.c, fchmodat.c, fchown-stub.c, fd-safer.c: * file-type.c, fileblocks.c, filemode.c, filenamecat.c: * fnmatch.c, fopen-safer.c, fprintftime.c, free.c, fsusage.c: * ftruncate.c, fts-cycle.c, fts.c, full-write.c, gai_strerror.c: * getcwd.c, getdate.y, getdomainname.c, getgroups.c: * gethostname.c, gethrxtime.c, getloadavg.c, getlogin_r.c: * getndelim2.c, getnline.c, getopt.c, getopt1.c, getpass.c: * gettime.c, gettimeofday.c, getugroups.c, getusershell.c: * glob.c, group-member.c, hard-locale.c, hash-pjw.c, hash.c: * human.c, idcache.c, inet_ntop.c, inet_pton.c, inttostr.c: * isdir.c, lchown.c, linebuffer.c, long-options.c, lstat.c: * malloc.c, md5.c, memcasecmp.c, memchr.c, memcmp.c, memcoll.c: * memcpy.c, memmove.c, memrchr.c, mkancesdirs.c, mkdir-p.c: * mkdir.c, mkdirat.c, mkstemp-safer.c, mkstemp.c, modechange.c: * mountlist.c, nanosleep.c, obstack.c, open-safer.c: * openat-die.c, openat.c, pagealign_alloc.c, physmem.c: * pipe-safer.c, posixtm.c, posixver.c, putenv.c, quote.c: * quotearg.c, raise.c, readtokens.c, readtokens0.c, readutmp.c: * realloc.c, regex.c, rename.c, rmdir.c, rpmatch.c, safe-read.c: * same.c, save-cwd.c, savedir.c, setenv.c, settime.c, sha1.c: * sig2str.c, snprintf.c, strdup.c, strerror.c, strftime.c: * stripslash.c, strndup.c, strnlen.c, strpbrk.c, strtod.c: * strtoimax.c, strtol.c, strverscmp.c, tempname.c, time_r.c: * timegm.c, tmpfile-safer.c, unlinkdir.c, userspec.c, utime.c: * utimecmp.c, utimens.c, version-etc-fsf.c, version-etc.c: * xalloc-die.c, xgetcwd.c, xgethostname.c, xmalloc.c: * xmemcoll.c, xnanosleep.c, xreadlink.c, xstrtod.c: * xstrtoimax.c, xstrtol.c, xstrtoumax.c, yesno.c: Likewise.
86 lines
3.0 KiB
C
86 lines
3.0 KiB
C
/* dirname.c -- return all but the last element in a file name
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Copyright (C) 1990, 1998, 2000, 2001, 2003, 2004, 2005, 2006 Free Software
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Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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#include <config.h>
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#include "dirname.h"
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#include <string.h>
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#include "xalloc.h"
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/* Return the length of the prefix of FILE that will be used by
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dir_name. If FILE is in the working directory, this returns zero
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even though `dir_name (FILE)' will return ".". Works properly even
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if there are trailing slashes (by effectively ignoring them). */
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size_t
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dir_len (char const *file)
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{
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size_t prefix_length = FILE_SYSTEM_PREFIX_LEN (file);
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size_t length;
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/* Advance prefix_length beyond important leading slashes. */
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prefix_length += (prefix_length != 0
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? (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
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&& ISSLASH (file[prefix_length]))
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: (ISSLASH (file[0])
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? ((DOUBLE_SLASH_IS_DISTINCT_ROOT
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&& ISSLASH (file[1]) && ! ISSLASH (file[2])
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? 2 : 1))
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: 0));
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/* Strip the basename and any redundant slashes before it. */
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for (length = last_component (file) - file;
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prefix_length < length; length--)
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if (! ISSLASH (file[length - 1]))
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break;
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return length;
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}
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/* In general, we can't use the builtin `dirname' function if available,
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since it has different meanings in different environments.
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In some environments the builtin `dirname' modifies its argument.
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Return the leading directories part of FILE, allocated with xmalloc.
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Works properly even if there are trailing slashes (by effectively
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ignoring them). Unlike POSIX dirname(), FILE cannot be NULL.
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If lstat (FILE) would succeed, then { chdir (dir_name (FILE));
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lstat (base_name (FILE)); } will access the same file. Likewise,
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if the sequence { chdir (dir_name (FILE));
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rename (base_name (FILE), "foo"); } succeeds, you have renamed FILE
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to "foo" in the same directory FILE was in. */
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char *
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dir_name (char const *file)
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{
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size_t length = dir_len (file);
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bool append_dot = (length == 0
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|| (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
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&& length == FILE_SYSTEM_PREFIX_LEN (file)
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&& file[2] != '\0' && ! ISSLASH (file[2])));
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char *dir = xmalloc (length + append_dot + 1);
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memcpy (dir, file, length);
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if (append_dot)
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dir[length++] = '.';
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dir[length] = '\0';
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return dir;
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}
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