105 lines
3.3 KiB
C
105 lines
3.3 KiB
C
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/* Work around platform bugs in stat.
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Copyright (C) 2009, 2010 Free Software 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 3 of the License, or
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(at your option) 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, see <http://www.gnu.org/licenses/>. */
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/* written by Eric Blake */
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#include <config.h>
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/* Get the original definition of stat. It might be defined as a macro. */
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#define __need_system_sys_stat_h
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#include <sys/types.h>
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#include <sys/stat.h>
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#undef __need_system_sys_stat_h
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static inline int
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orig_stat (const char *filename, struct stat *buf)
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{
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return stat (filename, buf);
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}
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/* Specification. */
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#include <sys/stat.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdbool.h>
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#include <string.h>
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/* Store information about NAME into ST. Work around bugs with
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trailing slashes. Mingw has other bugs (such as st_ino always
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being 0 on success) which this wrapper does not work around. But
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at least this implementation provides the ability to emulate fchdir
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correctly. */
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int
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rpl_stat (char const *name, struct stat *st)
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{
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int result = orig_stat (name, st);
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#if REPLACE_FUNC_STAT_FILE
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/* Solaris 9 mistakenly succeeds when given a non-directory with a
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trailing slash. */
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if (result == 0 && !S_ISDIR (st->st_mode))
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{
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size_t len = strlen (name);
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if (ISSLASH (name[len - 1]))
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{
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errno = ENOTDIR;
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return -1;
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}
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}
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#endif /* REPLACE_FUNC_STAT_FILE */
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#if REPLACE_FUNC_STAT_DIR
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if (result == -1 && errno == ENOENT)
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{
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/* Due to mingw's oddities, there are some directories (like
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c:\) where stat() only succeeds with a trailing slash, and
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other directories (like c:\windows) where stat() only
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succeeds without a trailing slash. But we want the two to be
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synonymous, since chdir() manages either style. Likewise, Mingw also
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reports ENOENT for names longer than PATH_MAX, when we want
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ENAMETOOLONG, and for stat("file/"), when we want ENOTDIR.
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Fortunately, mingw PATH_MAX is small enough for stack
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allocation. */
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char fixed_name[PATH_MAX + 1] = {0};
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size_t len = strlen (name);
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bool check_dir = false;
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if (PATH_MAX <= len)
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errno = ENAMETOOLONG;
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else if (len)
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{
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strcpy (fixed_name, name);
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if (ISSLASH (fixed_name[len - 1]))
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{
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check_dir = true;
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while (len && ISSLASH (fixed_name[len - 1]))
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fixed_name[--len] = '\0';
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if (!len)
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fixed_name[0] = '/';
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}
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else
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fixed_name[len++] = '/';
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result = orig_stat (fixed_name, st);
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if (result == 0 && check_dir && !S_ISDIR (st->st_mode))
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{
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result = -1;
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errno = ENOTDIR;
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}
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}
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}
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#endif /* REPLACE_FUNC_STAT_DIR */
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return result;
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}
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