X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fdos.m4;h=868626e7e5942cd5e0ca34530546fea0e3ca38f5;hb=30ffdfca0db8e3dede862ce911a200ecc1894fd5;hp=8ef27b2282fecff88c74f8fae583a30eeb34c985;hpb=160ca576320584395c886686db5ac109f8df9ca3;p=gnulib.git

diff --git a/m4/dos.m4 b/m4/dos.m4
index 8ef27b228..868626e7e 100644
--- a/m4/dos.m4
+++ b/m4/dos.m4
@@ -1,24 +1,53 @@
-# serial 1
+#serial 5
 
 # Define some macros required for proper operation of code in lib/*.c
 # on MSDOS/Windows systems.
 
 # From Jim Meyering.
 
-AC_DEFUN(jm_AC_DOS,
+AC_DEFUN([jm_AC_DOS],
   [
-    #if defined _WIN32 || defined __WIN32__ || defined __MSDOS__
-    ac_fspl_def="((Filename)[0] && (Filename)[1] == ':' ? 2 : 0)"
-    ac_fspl_def=0
-    AC_DEFINE_UNQUOTED([FILESYSTEM_PREFIX_LEN], $ac_fspl_def,
-      [On systems for which file names may have a so-called `drive letter'
-       prefix, define this to compute the length of that prefix, including
-       the colon.  Otherwise, define it to zero.])
-
-    ac_isslash_def="((C) == '/' || (C) == '\\')"
-    ac_isslash_def="((C) == '/')"
-    AC_DEFINE_UNQUOTED([ISSLASH], $ac_isslash_def,
-      [Define to return nonzero for any character that may serve as
-       a file name component separator.  On POSIX systems, it is the
-       slash character.  Some other systems also accept backslash.])
+    AC_CACHE_CHECK([whether system is Windows or MSDOS], [ac_cv_win_or_dos],
+      [
+        AC_TRY_COMPILE([],
+        [#if !defined _WIN32 && !defined __WIN32__ && !defined __MSDOS__
+neither MSDOS nor Windows
+#endif],
+        [ac_cv_win_or_dos=yes],
+        [ac_cv_win_or_dos=no])
+      ])
+
+    if test x"$ac_cv_win_or_dos" = xyes; then
+      ac_fs_accepts_drive_letter_prefix=1
+      ac_fs_backslash_is_file_name_separator=1
+    else
+      ac_fs_accepts_drive_letter_prefix=0
+      ac_fs_backslash_is_file_name_separator=0
+    fi
+
+    AH_VERBATIM(FILESYSTEM_PREFIX_LEN,
+    [#if FILESYSTEM_ACCEPTS_DRIVE_LETTER_PREFIX
+# define FILESYSTEM_PREFIX_LEN(Filename) \
+  ((Filename)[0] && (Filename)[1] == ':' ? 2 : 0)
+#else
+# define FILESYSTEM_PREFIX_LEN(Filename) 0
+#endif])
+
+    AC_DEFINE_UNQUOTED([FILESYSTEM_ACCEPTS_DRIVE_LETTER_PREFIX],
+      $ac_fs_accepts_drive_letter_prefix,
+      [Define on systems for which file names may have a so-called
+       `drive letter' prefix, define this to compute the length of that
+       prefix, including the colon.])
+
+    AH_VERBATIM(ISSLASH,
+    [#if FILESYSTEM_BACKSLASH_IS_FILE_NAME_SEPARATOR
+# define ISSLASH(C) ((C) == '/' || (C) == '\\')
+#else
+# define ISSLASH(C) ((C) == '/')
+#endif])
+
+    AC_DEFINE_UNQUOTED([FILESYSTEM_BACKSLASH_IS_FILE_NAME_SEPARATOR],
+      $ac_fs_backslash_is_file_name_separator,
+      [Define if the backslash character may also serve as a file name
+       component separator.])
   ])