-/* Work around the bug in some systems whereby stat/lstat succeeds when
- given the zero-length file name argument. The stat/lstat from SunOS 4.1.4
- has this bug. Also work around a deficiency in Solaris systems (up to at
- least Solaris 9) regarding the semantics of `lstat ("symlink/", sbuf).'
+/* Work around platform bugs in stat.
+ Copyright (C) 2009-2013 Free Software Foundation, Inc.
- Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003 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>
+/* 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;
-#endif
-#if defined LSTAT && ! LSTAT_FOLLOWS_SLASHED_SYMLINK
-# include <stdlib.h>
-# include <string.h>
-
-# ifdef STAT_MACROS_BROKEN
-# undef S_ISLNK
-# endif
-
-# ifndef S_ISLNK
-# ifdef S_IFLNK
-# define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
-# else
-# define S_ISLNK(m) 0
-# endif
+#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
-
-# include "xalloc.h"
-
-/* lstat works differently on Linux and Solaris systems. POSIX (see
- `pathname resolution' in the glossary) requires that programs like `ls'
- take into consideration the fact that FILE has a trailing slash when
- FILE is a symbolic link. On Linux systems, the lstat function already
- has the desired semantics (in treating `lstat("symlink/",sbuf)' just like
- `lstat("symlink/.",sbuf)', but on Solaris it does not.
-
- If FILE has a trailing slash and specifies a symbolic link,
- then append a `.' to FILE and call lstat a second time. */
+#endif
static int
-slash_aware_lstat (const char *file, struct stat *sbuf)
+orig_stat (const char *filename, struct stat *buf)
{
- size_t len;
- char *new_file;
-
- int lstat_result = lstat (file, sbuf);
-
- if (lstat_result != 0 || !S_ISLNK (sbuf->st_mode))
- return lstat_result;
-
- len = strlen (file);
- if (file[len - 1] != '/')
- return lstat_result;
-
- /* FILE refers to a symbolic link and the name ends with a slash.
- Append a `.' to FILE and repeat the lstat call. */
-
- /* Add one for the `.' we'll append, and one more for the trailing NUL. */
- new_file = xmalloc (len + 1 + 1);
- memcpy (new_file, file, len);
- new_file[len] = '.';
- new_file[len + 1] = 0;
-
- lstat_result = lstat (new_file, sbuf);
- free (new_file);
-
- return lstat_result;
+ return stat (filename, buf);
}
-#endif /* LSTAT && ! LSTAT_FOLLOWS_SLASHED_SYMLINK */
-
-/* This is a wrapper for stat/lstat.
- If FILE is the empty string, fail with errno == ENOENT.
- Otherwise, return the result of calling the real stat/lstat.
- This works around the bug in some systems whereby stat/lstat succeeds when
- given the zero-length file name argument. The stat/lstat from SunOS 4.1.4
- has this bug. */
+/* 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 function also provides a version of lstat with consistent semantics
- when FILE specifies a symbolic link and has a trailing slash. */
-
-#ifdef LSTAT
-# define rpl_xstat rpl_lstat
-# if ! LSTAT_FOLLOWS_SLASHED_SYMLINK
-# define xstat_return_val(F, S) slash_aware_lstat (F, S)
-# else
-# define xstat_return_val(F, S) lstat (F, S)
+#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
-#else
-# define rpl_xstat rpl_stat
-# define xstat_return_val(F, S) stat (F, S)
#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_xstat (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 xstat_return_val (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