From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001

From: Peter Jones <pjones@redhat.com>

Date: Wed, 3 Sep 2014 10:01:03 -0400

Subject: [PATCH] Add grub_util_readlink()

Add grub_util_readlink().  This requires pulling in stat and readlink from

gnulib, which pulls in stat and related headers, but after that the

implementation is straightforward.

Signed-off-by: Peter Jones <pjones@redhat.com>

Reviewed-by: Adam Jackson <ajax@redhat.com>

---

 grub-core/gnulib/gettimeofday.c       | 154 +++++++

 grub-core/gnulib/readlink.c           |  74 ++++

 grub-core/gnulib/stat.c               | 138 +++++++

 grub-core/osdep/windows/hostdisk.c    |   6 +

 grub-core/gnulib/pathmax.h            |  83 ++++

 grub-core/gnulib/sys_stat.in.h        | 732 ++++++++++++++++++++++++++++++++++

 grub-core/gnulib/sys_time.in.h        | 213 ++++++++++

 grub-core/gnulib/sys_types.in.h       |   2 +

 grub-core/gnulib/time.h               | 586 +++++++++++++++++++++++++++

 grub-core/gnulib/time.in.h            | 274 +++++++++++++

 include/grub/osdep/hostfile_aros.h    |   6 +

 include/grub/osdep/hostfile_unix.h    |   6 +

 include/grub/osdep/hostfile_windows.h |   2 +

 grub-core/gnulib/Makefile.am          | 177 +++++++-

 m4/gettimeofday.m4                    | 138 +++++++

 m4/gnulib-cache.m4                    |   3 +-

 m4/gnulib-comp.m4                     |  49 +++

 m4/largefile.m4                       | 146 +++++++

 m4/pathmax.m4                         |  42 ++

 m4/readlink.m4                        |  71 ++++

 m4/stat.m4                            |  71 ++++

 m4/sys_stat_h.m4                      |  96 +++++

 m4/sys_time_h.m4                      | 110 +++++

 m4/time_h.m4                          | 118 ++++++

 24 files changed, 3295 insertions(+), 2 deletions(-)

 create mode 100644 grub-core/gnulib/gettimeofday.c

 create mode 100644 grub-core/gnulib/readlink.c

 create mode 100644 grub-core/gnulib/stat.c

 create mode 100644 grub-core/gnulib/pathmax.h

 create mode 100644 grub-core/gnulib/sys_stat.in.h

 create mode 100644 grub-core/gnulib/sys_time.in.h

 create mode 100644 grub-core/gnulib/time.h

 create mode 100644 grub-core/gnulib/time.in.h

 create mode 100644 m4/gettimeofday.m4

 create mode 100644 m4/largefile.m4

 create mode 100644 m4/pathmax.m4

 create mode 100644 m4/readlink.m4

 create mode 100644 m4/stat.m4

 create mode 100644 m4/sys_stat_h.m4

 create mode 100644 m4/sys_time_h.m4

 create mode 100644 m4/time_h.m4

diff --git a/grub-core/gnulib/gettimeofday.c b/grub-core/gnulib/gettimeofday.c

new file mode 100644

index 00000000000..8b2058e8c87

--- /dev/null

+++ b/grub-core/gnulib/gettimeofday.c

@@ -0,0 +1,154 @@

+/* Provide gettimeofday for systems that don't have it or for which it's broken.

+

+   Copyright (C) 2001-2003, 2005-2007, 2009-2014 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, 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 <http://www.gnu.org/licenses/>.  */

+

+/* written by Jim Meyering */

+

+#include <config.h>

+

+/* Specification.  */

+#include <sys/time.h>

+

+#include <time.h>

+

+#if HAVE_SYS_TIMEB_H

+# include <sys/timeb.h>

+#endif

+

+#if GETTIMEOFDAY_CLOBBERS_LOCALTIME || TZSET_CLOBBERS_LOCALTIME

+

+/* Work around the bug in some systems whereby gettimeofday clobbers

+   the static buffer that localtime uses for its return value.  The

+   gettimeofday function from Mac OS X 10.0.4 (i.e., Darwin 1.3.7) has

+   this problem.  The tzset replacement is necessary for at least

+   Solaris 2.5, 2.5.1, and 2.6.  */

+

+static struct tm tm_zero_buffer;

+static struct tm *localtime_buffer_addr = &tm_zero_buffer;

+

+# undef localtime

+extern struct tm *localtime (time_t const *);

+

+# undef gmtime

+extern struct tm *gmtime (time_t const *);

+

+/* This is a wrapper for localtime.  It is used only on systems for which

+   gettimeofday clobbers the static buffer used for localtime's result.

+

+   On the first call, record the address of the static buffer that

+   localtime uses for its result.  */

+

+struct tm *

+rpl_localtime (time_t const *timep)

+{

+  struct tm *tm = localtime (timep);

+

+  if (localtime_buffer_addr == &tm_zero_buffer)

+    localtime_buffer_addr = tm;

+

+  return tm;

+}

+

+/* Same as above, since gmtime and localtime use the same buffer.  */

+struct tm *

+rpl_gmtime (time_t const *timep)

+{

+  struct tm *tm = gmtime (timep);

+

+  if (localtime_buffer_addr == &tm_zero_buffer)

+    localtime_buffer_addr = tm;

+

+  return tm;

+}

+

+#endif /* GETTIMEOFDAY_CLOBBERS_LOCALTIME || TZSET_CLOBBERS_LOCALTIME */

+

+#if TZSET_CLOBBERS_LOCALTIME

+

+# undef tzset

+extern void tzset (void);

+

+/* This is a wrapper for tzset, for systems on which tzset may clobber

+   the static buffer used for localtime's result.  */

+void

+rpl_tzset (void)

+{

+  /* Save and restore the contents of the buffer used for localtime's

+     result around the call to tzset.  */

+  struct tm save = *localtime_buffer_addr;

+  tzset ();

+  *localtime_buffer_addr = save;

+}

+#endif

+

+/* This is a wrapper for gettimeofday.  It is used only on systems

+   that lack this function, or whose implementation of this function

+   causes problems.  */

+

+int

+gettimeofday (struct timeval *restrict tv, void *restrict tz)

+{

+#undef gettimeofday

+#if HAVE_GETTIMEOFDAY

+# if GETTIMEOFDAY_CLOBBERS_LOCALTIME

+  /* Save and restore the contents of the buffer used for localtime's

+     result around the call to gettimeofday.  */

+  struct tm save = *localtime_buffer_addr;

+# endif

+

+# if defined timeval /* 'struct timeval' overridden by gnulib?  */

+#  undef timeval

+  struct timeval otv;

+  int result = gettimeofday (&otv, (struct timezone *) tz);

+  if (result == 0)

+    {

+      tv->tv_sec = otv.tv_sec;

+      tv->tv_usec = otv.tv_usec;

+    }

+# else

+  int result = gettimeofday (tv, (struct timezone *) tz);

+# endif

+

+# if GETTIMEOFDAY_CLOBBERS_LOCALTIME

+  *localtime_buffer_addr = save;

+# endif

+

+  return result;

+

+#else

+

+# if HAVE__FTIME

+

+  struct _timeb timebuf;

+  _ftime (&timebuf);

+  tv->tv_sec = timebuf.time;

+  tv->tv_usec = timebuf.millitm * 1000;

+

+# else

+

+#  if !defined OK_TO_USE_1S_CLOCK

+#   error "Only 1-second nominal clock resolution found.  Is that intended?" \

+          "If so, compile with the -DOK_TO_USE_1S_CLOCK option."

+#  endif

+  tv->tv_sec = time (NULL);

+  tv->tv_usec = 0;

+

+# endif

+

+  return 0;

+

+#endif

+}

diff --git a/grub-core/gnulib/readlink.c b/grub-core/gnulib/readlink.c

new file mode 100644

index 00000000000..4c496395176

--- /dev/null

+++ b/grub-core/gnulib/readlink.c

@@ -0,0 +1,74 @@

+/* Stub for readlink().

+   Copyright (C) 2003-2007, 2009-2014 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 <http://www.gnu.org/licenses/>.  */

+

+#include <config.h>

+

+/* Specification.  */

+#include <unistd.h>

+

+#include <errno.h>

+#include <string.h>

+#include <sys/stat.h>

+

+#if !HAVE_READLINK

+

+/* readlink() substitute for systems that don't have a readlink() function,

+   such as DJGPP 2.03 and mingw32.  */

+

+ssize_t

+readlink (const char *name, char *buf _GL_UNUSED,

+          size_t bufsize _GL_UNUSED)

+{

+  struct stat statbuf;

+

+  /* In general we should use lstat() here, not stat().  But on platforms

+     without symbolic links, lstat() - if it exists - would be equivalent to

+     stat(), therefore we can use stat().  This saves us a configure check.  */

+  if (stat (name, &statbuf) >= 0)

+    errno = EINVAL;

+  return -1;

+}

+

+#else /* HAVE_READLINK */

+

+# undef readlink

+

+/* readlink() wrapper that uses correct types, for systems like cygwin

+   1.5.x where readlink returns int, and which rejects trailing slash,

+   for Solaris 9.  */

+

+ssize_t

+rpl_readlink (const char *name, char *buf, size_t bufsize)

+{

+# if READLINK_TRAILING_SLASH_BUG

+  size_t len = strlen (name);

+  if (len && name[len - 1] == '/')

+    {

+      /* Even if name without the slash is a symlink to a directory,

+         both lstat() and stat() must resolve the trailing slash to

+         the directory rather than the symlink.  We can therefore

+         safely use stat() to distinguish between EINVAL and

+         ENOTDIR/ENOENT, avoiding extra overhead of rpl_lstat().  */

+      struct stat st;

+      if (stat (name, &st) == 0)

+        errno = EINVAL;

+      return -1;

+    }

+# endif /* READLINK_TRAILING_SLASH_BUG */

+  return readlink (name, buf, bufsize);

+}

+

+#endif /* HAVE_READLINK */

diff --git a/grub-core/gnulib/stat.c b/grub-core/gnulib/stat.c

new file mode 100644

index 00000000000..35f4b0b1a51

--- /dev/null

+++ b/grub-core/gnulib/stat.c

@@ -0,0 +1,138 @@

+/* Work around platform bugs in stat.

+   Copyright (C) 2009-2014 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 <http://www.gnu.org/licenses/>.  */

+

+/* 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>

+#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

+

+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"

+

+#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 (char const *name, struct stat *st)

+{

+  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))

+    {

+      size_t len = strlen (name);

+      if (ISSLASH (name[len - 1]))

+        {

+          errno = ENOTDIR;

+          return -1;

+        }

+    }

+#endif /* REPLACE_FUNC_STAT_FILE */

+#if REPLACE_FUNC_STAT_DIR

+

+  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;

+}

diff --git a/grub-core/osdep/windows/hostdisk.c b/grub-core/osdep/windows/hostdisk.c

index 85507af88e3..6f49df465d7 100644

--- a/grub-core/osdep/windows/hostdisk.c

+++ b/grub-core/osdep/windows/hostdisk.c

@@ -353,6 +353,12 @@ grub_util_mkdir (const char *dir)

   free (windows_name);

 }

+ssize_t

+grub_util_readlink (const char *name, char *buf, size_t bufsize)

+{

+  return readlink(name, buf, bufsize);

+}

+

 int

 grub_util_rename (const char *from, const char *to)

 {

diff --git a/grub-core/gnulib/pathmax.h b/grub-core/gnulib/pathmax.h

new file mode 100644

index 00000000000..33fc3553d75

--- /dev/null

+++ b/grub-core/gnulib/pathmax.h

@@ -0,0 +1,83 @@

+/* Define PATH_MAX somehow.  Requires sys/types.h.

+   Copyright (C) 1992, 1999, 2001, 2003, 2005, 2009-2014 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, 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 <http://www.gnu.org/licenses/>.  */

+

+#ifndef _PATHMAX_H

+# define _PATHMAX_H

+

+/* POSIX:2008 defines PATH_MAX to be the maximum number of bytes in a filename,

+   including the terminating NUL byte.

+   <http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/limits.h.html>

+   PATH_MAX is not defined on systems which have no limit on filename length,

+   such as GNU/Hurd.

+

+   This file does *not* define PATH_MAX always.  Programs that use this file

+   can handle the GNU/Hurd case in several ways:

+     - Either with a package-wide handling, or with a per-file handling,

+     - Either through a

+         #ifdef PATH_MAX

+       or through a fallback like

+         #ifndef PATH_MAX

+         # define PATH_MAX 8192

+         #endif

+       or through a fallback like

+         #ifndef PATH_MAX

+         # define PATH_MAX pathconf ("/", _PC_PATH_MAX)

+         #endif

+ */

+

+# include <unistd.h>

+

+# include <limits.h>

+

+# ifndef _POSIX_PATH_MAX

+#  define _POSIX_PATH_MAX 256

+# endif

+

+/* Don't include sys/param.h if it already has been.  */

+# if defined HAVE_SYS_PARAM_H && !defined PATH_MAX && !defined MAXPATHLEN

+#  include <sys/param.h>

+# endif

+

+# if !defined PATH_MAX && defined MAXPATHLEN

+#  define PATH_MAX MAXPATHLEN

+# endif

+

+# ifdef __hpux

+/* On HP-UX, PATH_MAX designates the maximum number of bytes in a filename,

+   *not* including the terminating NUL byte, and is set to 1023.

+   Additionally, when _XOPEN_SOURCE is defined to 500 or more, PATH_MAX is

+   not defined at all any more.  */

+#  undef PATH_MAX

+#  define PATH_MAX 1024

+# endif

+

+# if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__

+/* The page "Naming Files, Paths, and Namespaces" on msdn.microsoft.com,

+   section "Maximum Path Length Limitation",

+   <http://msdn.microsoft.com/en-us/library/aa365247(v=vs.85).aspx#maxpath>

+   explains that the maximum size of a filename, including the terminating

+   NUL byte, is 260 = 3 + 256 + 1.

+   This is the same value as

+     - FILENAME_MAX in <stdio.h>,

+     - _MAX_PATH in <stdlib.h>,

+     - MAX_PATH in <windef.h>.

+   Undefine the original value, because mingw's <limits.h> gets it wrong.  */

+#  undef PATH_MAX

+#  define PATH_MAX 260

+# endif

+

+#endif /* _PATHMAX_H */

diff --git a/grub-core/gnulib/sys_stat.in.h b/grub-core/gnulib/sys_stat.in.h

new file mode 100644

index 00000000000..b47a7ff0ae7

--- /dev/null

+++ b/grub-core/gnulib/sys_stat.in.h

@@ -0,0 +1,732 @@

+/* Provide a more complete sys/stat header file.

+   Copyright (C) 2005-2014 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, 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 <http://www.gnu.org/licenses/>.  */

+

+/* Written by Eric Blake, Paul Eggert, and Jim Meyering.  */

+

+/* This file is supposed to be used on platforms where <sys/stat.h> is

+   incomplete.  It is intended to provide definitions and prototypes

+   needed by an application.  Start with what the system provides.  */

+

+#if __GNUC__ >= 3

+@PRAGMA_SYSTEM_HEADER@

+#endif

+@PRAGMA_COLUMNS@

+

+#if defined __need_system_sys_stat_h

+/* Special invocation convention.  */

+

+#@INCLUDE_NEXT@ @NEXT_SYS_STAT_H@

+

+#else

+/* Normal invocation convention.  */

+

+#ifndef _@GUARD_PREFIX@_SYS_STAT_H

+

+/* Get nlink_t.

+   May also define off_t to a 64-bit type on native Windows.  */

+#include <sys/types.h>

+

+/* Get struct timespec.  */

+#include <time.h>

+

+/* The include_next requires a split double-inclusion guard.  */

+#@INCLUDE_NEXT@ @NEXT_SYS_STAT_H@

+

+#ifndef _@GUARD_PREFIX@_SYS_STAT_H

+#define _@GUARD_PREFIX@_SYS_STAT_H

+

+/* The definitions of _GL_FUNCDECL_RPL etc. are copied here.  */

+

+/* The definition of _GL_ARG_NONNULL is copied here.  */

+

+/* The definition of _GL_WARN_ON_USE is copied here.  */

+

+/* Before doing "#define mkdir rpl_mkdir" below, we need to include all

+   headers that may declare mkdir().  Native Windows platforms declare mkdir

+   in <io.h> and/or <direct.h>, not in <unistd.h>.  */

+#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__

+# include <io.h>     /* mingw32, mingw64 */

+# include <direct.h> /* mingw64, MSVC 9 */

+#endif

+

+/* Native Windows platforms declare umask() in <io.h>.  */

+#if 0 && ((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__)

+# include <io.h>

+#endif

+

+/* Large File Support on native Windows.  */

+#if @WINDOWS_64_BIT_ST_SIZE@

+# define stat _stati64

+#endif

+

+#ifndef S_IFIFO

+# ifdef _S_IFIFO

+#  define S_IFIFO _S_IFIFO

+# endif

+#endif

+

+#ifndef S_IFMT

+# define S_IFMT 0170000

+#endif

+

+#if STAT_MACROS_BROKEN

+# undef S_ISBLK

+# undef S_ISCHR

+# undef S_ISDIR

+# undef S_ISFIFO

+# undef S_ISLNK

+# undef S_ISNAM

+# undef S_ISMPB

+# undef S_ISMPC

+# undef S_ISNWK

+# undef S_ISREG

+# undef S_ISSOCK

+#endif

+

+#ifndef S_ISBLK

+# ifdef S_IFBLK

+#  define S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK)

+# else

+#  define S_ISBLK(m) 0

+# endif

+#endif

+

+#ifndef S_ISCHR

+# ifdef S_IFCHR

+#  define S_ISCHR(m) (((m) & S_IFMT) == S_IFCHR)

+# else

+#  define S_ISCHR(m) 0

+# endif

+#endif

+

+#ifndef S_ISDIR

+# ifdef S_IFDIR

+#  define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)

+# else

+#  define S_ISDIR(m) 0

+# endif

+#endif

+

+#ifndef S_ISDOOR /* Solaris 2.5 and up */

+# define S_ISDOOR(m) 0

+#endif

+

+#ifndef S_ISFIFO

+# ifdef S_IFIFO

+#  define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO)

+# else

+#  define S_ISFIFO(m) 0

+# endif

+#endif

+

+#ifndef S_ISLNK

+# ifdef S_IFLNK

+#  define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)

+# else

+#  define S_ISLNK(m) 0

+# endif

+#endif

+

+#ifndef S_ISMPB /* V7 */

+# ifdef S_IFMPB

+#  define S_ISMPB(m) (((m) & S_IFMT) == S_IFMPB)

+#  define S_ISMPC(m) (((m) & S_IFMT) == S_IFMPC)

+# else

+#  define S_ISMPB(m) 0

+#  define S_ISMPC(m) 0

+# endif

+#endif

+

+#ifndef S_ISMPX /* AIX */

+# define S_ISMPX(m) 0

+#endif

+

+#ifndef S_ISNAM /* Xenix */

+# ifdef S_IFNAM

+#  define S_ISNAM(m) (((m) & S_IFMT) == S_IFNAM)

+# else

+#  define S_ISNAM(m) 0

+# endif

+#endif

+

+#ifndef S_ISNWK /* HP/UX */

+# ifdef S_IFNWK

+#  define S_ISNWK(m) (((m) & S_IFMT) == S_IFNWK)

+# else

+#  define S_ISNWK(m) 0