diff options
Diffstat (limited to 'gl/lib/same.c')
-rw-r--r-- | gl/lib/same.c | 149 |
1 files changed, 0 insertions, 149 deletions
diff --git a/gl/lib/same.c b/gl/lib/same.c deleted file mode 100644 index cb5e60fc..00000000 --- a/gl/lib/same.c +++ /dev/null @@ -1,149 +0,0 @@ -/* Determine whether two file names refer to the same file. - - Copyright (C) 1997-2000, 2002-2006, 2009-2020 Free Software Foundation, Inc. - - This program is free software: you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 3 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program. If not, see <https://www.gnu.org/licenses/>. */ - -/* written by Jim Meyering */ - -#include <config.h> - -#include <fcntl.h> -#include <stdbool.h> -#include <stdio.h> -#include <unistd.h> -#include <stdlib.h> -#include <sys/types.h> -#include <sys/stat.h> -#include <ctype.h> -#include <errno.h> - -#include <string.h> - -#include <limits.h> -#ifndef _POSIX_NAME_MAX -# define _POSIX_NAME_MAX 14 -#endif - -#include "same.h" -#include "dirname.h" -#include "error.h" -#include "same-inode.h" - -#ifndef MIN -# define MIN(a, b) ((a) < (b) ? (a) : (b)) -#endif - -/* Whether file name components are silently truncated (behavior that - POSIX stopped allowing in 2008). This enables checks whether - truncated base names are the same, while checking the directories. */ -#if !_POSIX_NO_TRUNC && HAVE_FPATHCONF && defined _PC_NAME_MAX -# define CHECK_TRUNCATION true -#else -# define CHECK_TRUNCATION false -#endif - -/* Return nonzero if SOURCE and DEST point to the same name in the same - directory. */ - -bool -same_name (const char *source, const char *dest) -{ - return same_nameat (AT_FDCWD, source, AT_FDCWD, dest); -} - -/* Likewise, but interpret the file names relative to SOURCE_FD and DEST_FD, - in the style of openat. */ - -bool -same_nameat (int source_dfd, char const *source, - int dest_dfd, char const *dest) -{ - /* Compare the basenames. */ - char const *source_basename = last_component (source); - char const *dest_basename = last_component (dest); - size_t source_baselen = base_len (source_basename); - size_t dest_baselen = base_len (dest_basename); - bool identical_basenames = - (source_baselen == dest_baselen - && memcmp (source_basename, dest_basename, dest_baselen) == 0); - bool compare_dirs = identical_basenames; - bool same = false; - -#if CHECK_TRUNCATION - size_t slen_max = HAVE_LONG_FILE_NAMES ? 255 : _POSIX_NAME_MAX; - size_t min_baselen = MIN (source_baselen, dest_baselen); - if (slen_max <= min_baselen - && memcmp (source_basename, dest_basename, slen_max) == 0) - compare_dirs = true; -#endif - - if (compare_dirs) - { - struct stat source_dir_stats; - struct stat dest_dir_stats; - - /* Compare the parent directories (via the device and inode numbers). */ - char *source_dirname = dir_name (source); - int flags = AT_SYMLINK_NOFOLLOW; - if (fstatat (source_dfd, source_dirname, &source_dir_stats, flags) != 0) - { - /* Shouldn't happen. */ - error (1, errno, "%s", source_dirname); - } - free (source_dirname); - - char *dest_dirname = dir_name (dest); - -#if CHECK_TRUNCATION - int destdir_errno = 0; - int open_flags = O_SEARCH | O_CLOEXEC | O_DIRECTORY; - int destdir_fd = openat (dest_dfd, dest_dirname, open_flags); - if (destdir_fd < 0 || fstat (destdir_fd, &dest_dir_stats) != 0) - destdir_errno = errno; - else if (SAME_INODE (source_dir_stats, dest_dir_stats)) - { - same = identical_basenames; - if (! same) - { - errno = 0; - long name_max = fpathconf (destdir_fd, _PC_NAME_MAX); - if (name_max < 0) - destdir_errno = errno; - else - same = (name_max <= min_baselen - && (memcmp (source_basename, dest_basename, name_max) - == 0)); - } - } - close (destdir_fd); - if (destdir_errno != 0) - { - /* Shouldn't happen. */ - error (1, destdir_errno, "%s", dest_dirname); - } -#else - if (fstatat (dest_dfd, dest_dirname, &dest_dir_stats, flags) != 0) - { - /* Shouldn't happen. */ - error (1, errno, "%s", dest_dirname); - } - same = SAME_INODE (source_dir_stats, dest_dir_stats); -#endif - - free (dest_dirname); - } - - return same; -} |