X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fpathmax.h;h=a862eea1ec56afeefe48aa2ccb11c579f2427ab0;hb=41423a6ca6273e751ca6fd2376641f57b8e40ff8;hp=6941e457e39c6c18da9038f77d3f680d3ae6c9fd;hpb=7c3f8da8f075e3813ced160d5b53a28c6f7dfe78;p=gnulib.git

diff --git a/lib/pathmax.h b/lib/pathmax.h
index 6941e457e..a862eea1e 100644
--- a/lib/pathmax.h
+++ b/lib/pathmax.h
@@ -1,5 +1,6 @@
 /* Define PATH_MAX somehow.  Requires sys/types.h.
-   Copyright (C) 1992, 1999, 2001, 2003, 2005 Free Software Foundation, Inc.
+   Copyright (C) 1992, 1999, 2001, 2003, 2005, 2009-2012 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
@@ -18,6 +19,27 @@
 #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>
@@ -26,11 +48,6 @@
 #  define _POSIX_PATH_MAX 256
 # endif
 
-# if !defined PATH_MAX && defined _PC_PATH_MAX
-#  define PATH_MAX (pathconf ("/", _PC_PATH_MAX) < 1 ? 1024 \
-		    : pathconf ("/", _PC_PATH_MAX))
-# 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>
@@ -40,8 +57,28 @@
 #  define PATH_MAX MAXPATHLEN
 # endif
 
-# ifndef PATH_MAX
-#  define PATH_MAX _POSIX_PATH_MAX
+# 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 */