(fixfile): grep for $Id:, not $Id$, since the

[gnulib.git] / m4 / dos.m4

diff --git a/m4/dos.m4 b/m4/dos.m4
index f3f75ab..868626e 100644 (file)
--- a/m4/dos.m4
+++ b/m4/dos.m4
@@ -1,37 +1,53 @@
-# serial 2
+#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],
   [
-    # FIXME: this is incomplete.  Add a compile-test that does something
-    # like this:
-    #if defined _WIN32 || defined __WIN32__ || defined __MSDOS__
+    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
+#else
 # define FILESYSTEM_PREFIX_LEN(Filename) 0
 #endif])
 
-    AC_DEFINE([FILESYSTEM_ACCEPTS_DRIVE_LETTER_PREFIX],
+    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) == '\\\\')
+# define ISSLASH(C) ((C) == '/' || (C) == '\\')
 #else
 # define ISSLASH(C) ((C) == '/')
 #endif])
 
-    AC_DEFINE([FILESYSTEM_BACKSLASH_IS_FILE_NAME_SEPARATOR],
+    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.])
   ])