-/* Work around the bug in some systems whereby stat succeeds when
- given the zero-length file name argument. The stat from SunOS4.1.4
- has this bug.
- Copyright (C) 1997, 1998 Free Software Foundation, Inc.
+/* Work around platform bugs in stat.
+ Copyright (C) 2009-2013 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ 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 2, or (at your option)
- any later version.
+ 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
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, write to the Free Software Foundation,
- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
-/* written by Jim Meyering */
+/* written by Eric Blake */
+/* If the user's config.h happens to include <sys/stat.h>, let it include only
+ the system's <sys/stat.h> here, so that orig_stat doesn't recurse to
+ rpl_stat. */
+#define __need_system_sys_stat_h
#include <config.h>
-/* Disable the definition of stat to rpl_stat (from config.h) in this
- file. Otherwise, we'd get conflicting prototypes for rpl_stat on
- most systems. */
-#undef stat
-
+/* Get the original definition of stat. It might be defined as a macro. */
#include <sys/types.h>
#include <sys/stat.h>
-#include <errno.h>
-#ifndef errno
-extern int errno;
+#undef __need_system_sys_stat_h
+
+#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+# if _GL_WINDOWS_64_BIT_ST_SIZE
+# undef stat /* avoid warning on mingw64 with _FILE_OFFSET_BITS=64 */
+# define stat _stati64
+# define REPLACE_FUNC_STAT_DIR 1
+# undef REPLACE_FUNC_STAT_FILE
+# elif REPLACE_FUNC_STAT_FILE
+/* mingw64 has a broken stat() function, based on _stat(), in libmingwex.a.
+ Bypass it. */
+# define stat _stat
+# define REPLACE_FUNC_STAT_DIR 1
+# undef REPLACE_FUNC_STAT_FILE
+# endif
#endif
-/* This is a wrapper for stat(2).
- If FILE is the empty string, fail with errno == ENOENT.
- Otherwise, return the result of calling the real stat.
+static int
+orig_stat (const char *filename, struct stat *buf)
+{
+ return stat (filename, buf);
+}
+
+/* Specification. */
+/* Write "sys/stat.h" here, not <sys/stat.h>, otherwise OSF/1 5.1 DTK cc
+ eliminates this include because of the preliminary #include <sys/stat.h>
+ above. */
+#include "sys/stat.h"
- This works around the bug in some systems whereby stat succeeds when
- given the zero-length file name argument. The stat from SunOS4.1.4
- has this bug. */
+#include <errno.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <string.h>
+#include "dosname.h"
+#include "verify.h"
+
+#if REPLACE_FUNC_STAT_DIR
+# include "pathmax.h"
+ /* The only known systems where REPLACE_FUNC_STAT_DIR is needed also
+ have a constant PATH_MAX. */
+# ifndef PATH_MAX
+# error "Please port this replacement to your platform"
+# endif
+#endif
+
+/* Store information about NAME into ST. Work around bugs with
+ trailing slashes. Mingw has other bugs (such as st_ino always
+ being 0 on success) which this wrapper does not work around. But
+ at least this implementation provides the ability to emulate fchdir
+ correctly. */
int
-rpl_stat (file, sbuf)
- const char *file;
- struct stat *sbuf;
+rpl_stat (char const *name, struct stat *st)
{
- if (file && *file == 0)
+ int result = orig_stat (name, st);
+#if REPLACE_FUNC_STAT_FILE
+ /* Solaris 9 mistakenly succeeds when given a non-directory with a
+ trailing slash. */
+ if (result == 0 && !S_ISDIR (st->st_mode))
{
- errno = ENOENT;
- return -1;
+ size_t len = strlen (name);
+ if (ISSLASH (name[len - 1]))
+ {
+ errno = ENOTDIR;
+ return -1;
+ }
}
+#endif /* REPLACE_FUNC_STAT_FILE */
+#if REPLACE_FUNC_STAT_DIR
- return stat (file, sbuf);
+ if (result == -1 && errno == ENOENT)
+ {
+ /* Due to mingw's oddities, there are some directories (like
+ c:\) where stat() only succeeds with a trailing slash, and
+ other directories (like c:\windows) where stat() only
+ succeeds without a trailing slash. But we want the two to be
+ synonymous, since chdir() manages either style. Likewise, Mingw also
+ reports ENOENT for names longer than PATH_MAX, when we want
+ ENAMETOOLONG, and for stat("file/"), when we want ENOTDIR.
+ Fortunately, mingw PATH_MAX is small enough for stack
+ allocation. */
+ char fixed_name[PATH_MAX + 1] = {0};
+ size_t len = strlen (name);
+ bool check_dir = false;
+ verify (PATH_MAX <= 4096);
+ if (PATH_MAX <= len)
+ errno = ENAMETOOLONG;
+ else if (len)
+ {
+ strcpy (fixed_name, name);
+ if (ISSLASH (fixed_name[len - 1]))
+ {
+ check_dir = true;
+ while (len && ISSLASH (fixed_name[len - 1]))
+ fixed_name[--len] = '\0';
+ if (!len)
+ fixed_name[0] = '/';
+ }
+ else
+ fixed_name[len++] = '/';
+ result = orig_stat (fixed_name, st);
+ if (result == 0 && check_dir && !S_ISDIR (st->st_mode))
+ {
+ result = -1;
+ errno = ENOTDIR;
+ }
+ }
+ }
+#endif /* REPLACE_FUNC_STAT_DIR */
+ return result;
}
projects / gnulib.git / blobdiff