X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;ds=sidebyside;f=lib%2Fpathmax.h;h=a1e458c12a5284f00de2a689044bcbf3e1e2e244;hb=24bfc89ccc3fd4ce86652dbbb95afd844db59a07;hp=74f5792a9d725b46607719711dfe817b0393ff69;hpb=f49cdb3fcfccab4b4e56f08aa00b7df561951662;p=gnulib.git

diff --git a/lib/pathmax.h b/lib/pathmax.h
index 74f5792a9..a1e458c12 100644
--- a/lib/pathmax.h
+++ b/lib/pathmax.h
@@ -1,5 +1,6 @@
 /* Define PATH_MAX somehow.  Requires sys/types.h.
-   Copyright (C) 1992 Free Software Foundation, Inc.
+   Copyright (C) 1992, 1999, 2001, 2003, 2005, 2009-2011 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
@@ -13,41 +14,56 @@
 
    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.  */
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
 
 #ifndef _PATHMAX_H
-#define _PATHMAX_H
+# define _PATHMAX_H
 
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
+/* 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.
 
-/* Non-POSIX BSD systems might have gcc's limits.h, which doesn't define
-   PATH_MAX but might cause redefinition warnings when sys/param.h is
-   later included (as on MORE/BSD 4.3).  */
-#if defined(_POSIX_VERSION) || (defined(HAVE_LIMITS_H) && !defined(__GNUC__))
-#include <limits.h>
-#endif
+   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
+ */
 
-#ifndef _POSIX_PATH_MAX
-#define _POSIX_PATH_MAX 255
-#endif
+# include <unistd.h>
 
-#if !defined(PATH_MAX) && defined(_PC_PATH_MAX)
-#define PATH_MAX (pathconf ("/", _PC_PATH_MAX) < 1 ? 1024 : pathconf ("/", _PC_PATH_MAX))
-#endif
+# 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 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
+# if !defined PATH_MAX && defined MAXPATHLEN
+#  define PATH_MAX MAXPATHLEN
+# endif
 
-#ifndef PATH_MAX
-#define PATH_MAX _POSIX_PATH_MAX
-#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
 
 #endif /* _PATHMAX_H */