gc: support HMAC-SHA256 and HMAC-SHA512.

[gnulib.git] / lib / pathmax.h

diff --git a/lib/pathmax.h b/lib/pathmax.h
index c6793f6..5793e46 100644 (file)
--- a/lib/pathmax.h
+++ b/lib/pathmax.h
@@ -1,5 +1,5 @@
 /* Define PATH_MAX somehow.  Requires sys/types.h.
-   Copyright (C) 1992, 1999, 2001, 2003, 2005, 2009-2011 Free Software
+   Copyright (C) 1992, 1999, 2001, 2003, 2005, 2009-2013 Free Software
    Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
@@ -13,8 +13,7 @@
    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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+   along with this program; if not, see <http://www.gnu.org/licenses/>.  */
 
 #ifndef _PATHMAX_H
 # define _PATHMAX_H
@@ -23,7 +22,22 @@
    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.  */
+   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>
 
@@ -33,11 +47,6 @@
 #  define _POSIX_PATH_MAX 256
 # endif
 
-# if !defined PATH_MAX && defined _PC_PATH_MAX && defined HAVE_PATHCONF
-#  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>
@@ -47,10 +56,6 @@
 #  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.
@@ -60,4 +65,19 @@
 #  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 */