[PATCH] dirname: move m4/dos.m4 functionality into lib/dosname.h

[Paul Eggert]

OK, here's that promised patch for review.  I've tested it with Emacs
and with coreutils, but I haven't pushed it into gnulib yet.

---
 ChangeLog            |   35 ++++++++++++++++++++++++
 lib/at-func.c        |    2 +-
 lib/at-func2.c       |    2 +-
 lib/dirname.h        |   30 +--------------------
 lib/dosname.h        |   53 +++++++++++++++++++++++++++++++++++++
 lib/openat.c         |    2 +-
 lib/rmdir.c          |    2 +
 lib/savewd.c         |    2 +-
 lib/stat.c           |    1 +
 lib/unlink.c         |    2 +
 lib/unlinkat.c       |    1 +
 m4/dirname.m4        |    3 +-
 m4/dos.m4            |   71 --------------------------------------------------
 m4/rmdir.m4          |    3 +-
 m4/stat.m4           |    3 +-
 m4/unlink.m4         |    3 +-
 modules/dirname-lgpl |    2 +-
 modules/lstat        |    1 +
 modules/openat       |    2 +-
 modules/rmdir        |    2 +-
 modules/savewd       |    2 +-
 modules/stat         |    2 +-
 modules/unlink       |    2 +-
 tests/test-dirname.c |    6 ++--
 24 files changed, 113 insertions(+), 121 deletions(-)
 create mode 100644 lib/dosname.h
 delete mode 100644 m4/dos.m4

diff --git a/ChangeLog b/ChangeLog
index e40fe97..3ac3cf1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,40 @@
 2011-02-24  Paul Eggert  <address@hidden>
 
+       dirname: move m4/dos.m4 functionality into lib/dosname.h
+
+       m4/dos.m4 needs to go.  It laboriously invokes the C compiler, and
+       extracts symbols from it, puts them into config.h; but it's much
+       easier to use the symbols directly.  filename.h already does this,
+       but it disagrees with dos.m4 in some respects.  This patch
+       introduces a different include file dosname.h that packages up
+       dos.m4, and then later we can work on merging filename.h and
+       dosname.h.
+       * lib/dosname.h: New file.
+       * lib/dirname.h (ISSLASH, FILE_SYSTEM_PREFIX_LEN):
+       (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE):
+       (IS_ABSOLUTE_FILE_NAME, IS_RELATIVE_FILE_NAME): Move to lib/dosname.h.
+       * lib/at-func.c, lib/at-func2.c, lib/openat.c, lib/savewd.c:
+       Include dosname.h, not dirname.h.
+       * lib/rmdir.c, lib/stat.c, lib/unlink.c, lib/unlinkat.c:
+       Include dosname.h, for definitions of symbols like ISSLASH
+       that used to be in config.h.
+       * m4/dirname.m4 (gl_DIRNAME_LGPL): Do not require gl_AC_DOS.
+       * m4/rmdir.m4 (gl_FUNC_RMDIR): Likewise.
+       * m4/stat.m4 (gl_FUNC_STAT): Likewise.
+       * m4/unlink.m4 (gl_FUNC_UNLINK): Likewise.
+       * modules/dirname-lgpl (Files): Replace m4/dos.m4 with lib/dosname.h.
+       * modules/rmdir (Files): Likewise.
+       * modules/stat (Files): Likewise.
+       * modules/unlink (Files): Likewise.
+       * modules/lstat (Files): Add lib/dosname.h.
+       * modules/openat (Files): Likewise.
+       * modules/savewd (Files): Likewise.
+       * modules/openat (Depends-on): Remove dirname-lgpl.
+       * modules/savewd (Depends-on): Likewise.
+       * tests/test-dirname.c: Do not use removed symbols like
+       FILE_SYSTEM_BACKSLASH_IS_FILE_NAME_SEPARATOR.  Instead, use
+       the remaining symbols, e.g., ISSLASH ('\\').
+
        filenamecat: remove unnecessary dependency on dirname-lgpl
        * modules/filenamecat (Depends-on): Remove dirname-lgpl, as there
        is no direct dependency, just an indirect one via filenamecat-lgpl.
diff --git a/lib/at-func.c b/lib/at-func.c
index 31a75f1..52868bc 100644
--- a/lib/at-func.c
+++ b/lib/at-func.c
@@ -16,7 +16,7 @@
 
 /* written by Jim Meyering */
 
-#include "dirname.h" /* solely for definition of IS_ABSOLUTE_FILE_NAME */
+#include "dosname.h" /* solely for definition of IS_ABSOLUTE_FILE_NAME */
 #include "openat.h"
 #include "openat-priv.h"
 #include "save-cwd.h"
diff --git a/lib/at-func2.c b/lib/at-func2.c
index 29e6772..da691fe 100644
--- a/lib/at-func2.c
+++ b/lib/at-func2.c
@@ -25,7 +25,7 @@
 #include <string.h>
 #include <unistd.h>
 
-#include "dirname.h" /* solely for definition of IS_ABSOLUTE_FILE_NAME */
+#include "dosname.h" /* solely for definition of IS_ABSOLUTE_FILE_NAME */
 #include "filenamecat.h"
 #include "openat.h"
 #include "same-inode.h"
diff --git a/lib/dirname.h b/lib/dirname.h
index f089955..2ef9882 100644
--- a/lib/dirname.h
+++ b/lib/dirname.h
@@ -21,44 +21,16 @@
 
 # include <stdbool.h>
 # include <stddef.h>
+# include "dosname.h"
 
 # ifndef DIRECTORY_SEPARATOR
 #  define DIRECTORY_SEPARATOR '/'
 # endif
 
-# ifndef ISSLASH
-#  define ISSLASH(C) ((C) == DIRECTORY_SEPARATOR)
-# endif
-
-# ifndef FILE_SYSTEM_PREFIX_LEN
-#  if FILE_SYSTEM_ACCEPTS_DRIVE_LETTER_PREFIX
-    /* This internal macro assumes ASCII, but all hosts that support drive
-       letters use ASCII.  */
-#   define _IS_DRIVE_LETTER(c) (((unsigned int) (c) | ('a' - 'A')) - 'a' \
-                                <= 'z' - 'a')
-#   define FILE_SYSTEM_PREFIX_LEN(Filename) \
-           (_IS_DRIVE_LETTER ((Filename)[0]) && (Filename)[1] == ':' ? 2 : 0)
-#  else
-#   define FILE_SYSTEM_PREFIX_LEN(Filename) 0
-#  endif
-# endif
-
-# ifndef FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
-#  define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 0
-# endif
-
 # ifndef DOUBLE_SLASH_IS_DISTINCT_ROOT
 #  define DOUBLE_SLASH_IS_DISTINCT_ROOT 0
 # endif
 
-# if FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
-#  define IS_ABSOLUTE_FILE_NAME(F) ISSLASH ((F)[FILE_SYSTEM_PREFIX_LEN (F)])
-# else
-#  define IS_ABSOLUTE_FILE_NAME(F) \
-          (ISSLASH ((F)[0]) || 0 < FILE_SYSTEM_PREFIX_LEN (F))
-# endif
-# define IS_RELATIVE_FILE_NAME(F) (! IS_ABSOLUTE_FILE_NAME (F))
-
 # if GNULIB_DIRNAME
 char *base_name (char const *file);
 char *dir_name (char const *file);
diff --git a/lib/dosname.h b/lib/dosname.h
new file mode 100644
index 0000000..acdd03b
--- /dev/null
+++ b/lib/dosname.h
@@ -0,0 +1,53 @@
+/* File names on MS-DOS/Windows systems.
+
+   Copyright (C) 2000-2001, 2004-2006, 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
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   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, see <http://www.gnu.org/licenses/>.
+
+   From Paul Eggert and Jim Meyering.  */
+
+#ifndef _DOSNAME_H
+#define _DOSNAME_H
+
+#if (defined _WIN32 || defined __WIN32__ ||     \
+     defined __MSDOS__ || defined __CYGWIN__ || \
+     defined __EMX__ || defined __DJGPP__)
+   /* This internal macro assumes ASCII, but all hosts that support drive
+      letters use ASCII.  */
+# define _IS_DRIVE_LETTER(C) (((unsigned int) (C) | ('a' - 'A')) - 'a'  \
+                              <= 'z' - 'a')
+# define FILE_SYSTEM_PREFIX_LEN(Filename) \
+          (_IS_DRIVE_LETTER ((Filename)[0]) && (Filename)[1] == ':' ? 2 : 0)
+# ifndef __CYGWIN__
+#  define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 1
+# endif
+# define ISSLASH(C) ((C) == '/' || (C) == '\\')
+#else
+# define FILE_SYSTEM_PREFIX_LEN(Filename) 0
+# define ISSLASH(C) ((C) == '/')
+#endif
+
+#ifndef FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
+# define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 0
+#endif
+
+#if FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
+#  define IS_ABSOLUTE_FILE_NAME(F) ISSLASH ((F)[FILE_SYSTEM_PREFIX_LEN (F)])
+# else
+#  define IS_ABSOLUTE_FILE_NAME(F)                              \
+     (ISSLASH ((F)[0]) || FILE_SYSTEM_PREFIX_LEN (F) != 0)
+#endif
+#define IS_RELATIVE_FILE_NAME(F) (! IS_ABSOLUTE_FILE_NAME (F))
+
+#endif /* DOSNAME_H_ */
diff --git a/lib/openat.c b/lib/openat.c
index 939e3c7..18491a6 100644
--- a/lib/openat.c
+++ b/lib/openat.c
@@ -25,7 +25,7 @@
 #include <string.h>
 #include <sys/stat.h>
 
-#include "dirname.h" /* solely for definition of IS_ABSOLUTE_FILE_NAME */
+#include "dosname.h" /* solely for definition of IS_ABSOLUTE_FILE_NAME */
 #include "openat-priv.h"
 #include "save-cwd.h"
 
diff --git a/lib/rmdir.c b/lib/rmdir.c
index 8e02c37..d7395a5 100644
--- a/lib/rmdir.c
+++ b/lib/rmdir.c
@@ -23,6 +23,8 @@
 #include <errno.h>
 #include <string.h>
 
+#include "dosname.h"
+
 #undef rmdir
 
 /* Remove directory DIR.
diff --git a/lib/savewd.c b/lib/savewd.c
index 982e73f..f19e98e 100644
--- a/lib/savewd.c
+++ b/lib/savewd.c
@@ -31,7 +31,7 @@
 #include <sys/wait.h>
 #include <unistd.h>
 
-#include "dirname.h"
+#include "dosname.h"
 #include "fcntl-safer.h"
 
 /* Save the working directory into *WD, if it hasn't been saved
diff --git a/lib/stat.c b/lib/stat.c
index f16d914..cbc9100 100644
--- a/lib/stat.c
+++ b/lib/stat.c
@@ -37,6 +37,7 @@ orig_stat (const char *filename, struct stat *buf)
 #include <limits.h>
 #include <stdbool.h>
 #include <string.h>
+#include "dosname.h"
 
 /* Store information about NAME into ST.  Work around bugs with
    trailing slashes.  Mingw has other bugs (such as st_ino always
diff --git a/lib/unlink.c b/lib/unlink.c
index 7b14d80..677d584 100644
--- a/lib/unlink.c
+++ b/lib/unlink.c
@@ -24,6 +24,8 @@
 #include <string.h>
 #include <sys/stat.h>
 
+#include "dosname.h"
+
 #undef unlink
 
 /* Remove file NAME.
diff --git a/lib/unlinkat.c b/lib/unlinkat.c
index 9f1894a..fd1c69e 100644
--- a/lib/unlinkat.c
+++ b/lib/unlinkat.c
@@ -26,6 +26,7 @@
 #include <string.h>
 #include <sys/stat.h>
 
+#include "dosname.h"
 #include "openat.h"
 
 #if HAVE_UNLINKAT
diff --git a/m4/dirname.m4 b/m4/dirname.m4
index d0b439f..9d5f40d 100644
--- a/m4/dirname.m4
+++ b/m4/dirname.m4
@@ -1,4 +1,4 @@
-#serial 8   -*- autoconf -*-
+#serial 9   -*- autoconf -*-
 dnl Copyright (C) 2002-2006, 2009-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -18,7 +18,6 @@ AC_DEFUN([gl_DIRNAME_LGPL],
   AC_LIBOBJ([stripslash])
 
   dnl Prerequisites of lib/dirname.h.
-  AC_REQUIRE([gl_AC_DOS])
   AC_REQUIRE([gl_DOUBLE_SLASH_ROOT])
 
   dnl No prerequisites of lib/basename-lgpl.c, lib/dirname-lgpl.c,
diff --git a/m4/dos.m4 b/m4/dos.m4
deleted file mode 100644
index ed9c4ce..0000000
--- a/m4/dos.m4
+++ /dev/null
@@ -1,71 +0,0 @@
-#serial 11   -*- autoconf -*-
-
-# Define some macros required for proper operation of code in lib/*.c
-# on MSDOS/Windows systems.
-
-# Copyright (C) 2000-2001, 2004-2006, 2009-2011 Free Software Foundation, Inc.
-# This file is free software; the Free Software Foundation
-# gives unlimited permission to copy and/or distribute it,
-# with or without modifications, as long as this notice is preserved.
-
-# From Jim Meyering.
-
-AC_DEFUN([gl_AC_DOS],
-  [
-    AC_CACHE_CHECK([whether system is Windows or MSDOS], [ac_cv_win_or_dos],
-      [
-        AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [[
-#if !defined _WIN32 && !defined __WIN32__ && !defined __MSDOS__ && !defined 
__CYGWIN__
-neither MSDOS nor Windows
-#endif]])],
-        [ac_cv_win_or_dos=yes],
-        [ac_cv_win_or_dos=no])
-      ])
-
-    if test x"$ac_cv_win_or_dos" = xyes; then
-      ac_fs_accepts_drive_letter_prefix=1
-      ac_fs_backslash_is_file_name_separator=1
-      AC_CACHE_CHECK([whether drive letter can start relative path],
-                     [ac_cv_drive_letter_can_be_relative],
-        [
-          AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [[
-#if defined __CYGWIN__
-drive letters are always absolute
-#endif]])],
-          [ac_cv_drive_letter_can_be_relative=yes],
-          [ac_cv_drive_letter_can_be_relative=no])
-        ])
-      if test x"$ac_cv_drive_letter_can_be_relative" = xyes; then
-        ac_fs_drive_letter_can_be_relative=1
-      else
-        ac_fs_drive_letter_can_be_relative=0
-      fi
-    else
-      ac_fs_accepts_drive_letter_prefix=0
-      ac_fs_backslash_is_file_name_separator=0
-      ac_fs_drive_letter_can_be_relative=0
-    fi
-
-    AC_DEFINE_UNQUOTED([FILE_SYSTEM_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 FILE_SYSTEM_BACKSLASH_IS_FILE_NAME_SEPARATOR
-# define ISSLASH(C) ((C) == '/' || (C) == '\\')
-#else
-# define ISSLASH(C) ((C) == '/')
-#endif])
-
-    AC_DEFINE_UNQUOTED([FILE_SYSTEM_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.])
-
-    AC_DEFINE_UNQUOTED([FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE],
-      $ac_fs_drive_letter_can_be_relative,
-      [Define if a drive letter prefix denotes a relative path if it is
-       not followed by a file name component separator.])
-  ])
diff --git a/m4/rmdir.m4 b/m4/rmdir.m4
index 16402a5..41705a1 100644
--- a/m4/rmdir.m4
+++ b/m4/rmdir.m4
@@ -1,4 +1,4 @@
-# rmdir.m4 serial 9
+# rmdir.m4 serial 10
 dnl Copyright (C) 2002, 2005, 2009-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -6,7 +6,6 @@ dnl with or without modifications, as long as this notice is 
preserved.
 
 AC_DEFUN([gl_FUNC_RMDIR],
 [
-  AC_REQUIRE([gl_AC_DOS])
   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
   dnl Detect cygwin 1.5.x bug.
   AC_CACHE_CHECK([whether rmdir works], [gl_cv_func_rmdir_works],
diff --git a/m4/stat.m4 b/m4/stat.m4
index 4883fe2..27f82d5 100644
--- a/m4/stat.m4
+++ b/m4/stat.m4
@@ -1,4 +1,4 @@
-# serial 6
+# serial 7
 
 # Copyright (C) 2009-2011 Free Software Foundation, Inc.
 #
@@ -9,7 +9,6 @@
 AC_DEFUN([gl_FUNC_STAT],
 [
   AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
-  AC_REQUIRE([gl_AC_DOS])
   AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
   AC_CHECK_FUNCS_ONCE([lstat])
   dnl mingw is the only known platform where stat(".") and stat("./") differ
diff --git a/m4/unlink.m4 b/m4/unlink.m4
index 6d5d3d3..a49a692 100644
--- a/m4/unlink.m4
+++ b/m4/unlink.m4
@@ -1,4 +1,4 @@
-# unlink.m4 serial 6
+# unlink.m4 serial 7
 dnl Copyright (C) 2009-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -6,7 +6,6 @@ dnl with or without modifications, as long as this notice is 
preserved.
 
 AC_DEFUN([gl_FUNC_UNLINK],
 [
-  AC_REQUIRE([gl_AC_DOS])
   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
   AC_REQUIRE([AC_CANONICAL_HOST])
   dnl Detect FreeBSD 7.2, AIX 7.1, Solaris 9 bug.
diff --git a/modules/dirname-lgpl b/modules/dirname-lgpl
index 38f779a..6faaf33 100644
--- a/modules/dirname-lgpl
+++ b/modules/dirname-lgpl
@@ -5,9 +5,9 @@ Files:
 lib/dirname.h
 lib/dirname-lgpl.c
 lib/basename-lgpl.c
+lib/dosname.h
 lib/stripslash.c
 m4/dirname.m4
-m4/dos.m4
 
 Depends-on:
 double-slash-root
diff --git a/modules/lstat b/modules/lstat
index e4eabb5..a23fa91 100644
--- a/modules/lstat
+++ b/modules/lstat
@@ -2,6 +2,7 @@ Description:
 lstat() function: return information about a file or symbolic link.
 
 Files:
+lib/dosname.h
 lib/lstat.c
 m4/lstat.m4
 
diff --git a/modules/openat b/modules/openat
index 37cae80..4a6564d 100644
--- a/modules/openat
+++ b/modules/openat
@@ -3,6 +3,7 @@ Open a file at a directory.
 
 Files:
 lib/at-func.c
+lib/dosname.h
 lib/fchmodat.c
 lib/fchownat.c
 lib/fstatat.c
@@ -16,7 +17,6 @@ m4/openat.m4
 m4/mode_t.m4
 
 Depends-on:
-dirname-lgpl
 errno
 extensions
 fchdir
diff --git a/modules/rmdir b/modules/rmdir
index d047e4c..15d53d6 100644
--- a/modules/rmdir
+++ b/modules/rmdir
@@ -2,8 +2,8 @@ Description:
 rmdir() function: delete a directory.
 
 Files:
+lib/dosname.h
 lib/rmdir.c
-m4/dos.m4
 m4/rmdir.m4
 
 Depends-on:
diff --git a/modules/savewd b/modules/savewd
index 41f51e3..623d6a5 100644
--- a/modules/savewd
+++ b/modules/savewd
@@ -2,12 +2,12 @@ Description:
 Save and restore the working directory, possibly using a child process.
 
 Files:
+lib/dosname.h
 lib/savewd.h
 lib/savewd.c
 m4/savewd.m4
 
 Depends-on:
-dirname-lgpl
 errno
 exit
 fchdir
diff --git a/modules/stat b/modules/stat
index 1ad5e90..150d876 100644
--- a/modules/stat
+++ b/modules/stat
@@ -2,8 +2,8 @@ Description:
 stat() function: query file information
 
 Files:
+lib/dosname.h
 lib/stat.c
-m4/dos.m4
 m4/stat.m4
 
 Depends-on:
diff --git a/modules/unlink b/modules/unlink
index 4c8c649..c79b9c2 100644
--- a/modules/unlink
+++ b/modules/unlink
@@ -2,8 +2,8 @@ Description:
 unlink() function: remove a file.
 
 Files:
+lib/dosname.h
 lib/unlink.c
-m4/dos.m4
 m4/unlink.m4
 
 Depends-on:
diff --git a/tests/test-dirname.c b/tests/test-dirname.c
index bda1ee8..1ddf229 100644
--- a/tests/test-dirname.c
+++ b/tests/test-dirname.c
@@ -54,7 +54,7 @@ static struct test tests[] = {
   {"",          ".",    "",     "",     "",     false,  false},
   {".",         ".",    ".",    ".",    ".",    false,  false},
   {"..",        ".",    "..",   "..",   "..",   false,  false},
-#if FILE_SYSTEM_BACKSLASH_IS_FILE_NAME_SEPARATOR
+#if ISSLASH ('\\')
   {"a\\",       ".",    "a\\",  "a\\",  "a",    true,   false},
   {"a\\b",      "a",    "b",    "b",    "a\\b", false,  false},
   {"\\",        "\\",   "",     "\\",   "\\",   false,  true},
@@ -75,7 +75,7 @@ static struct test tests[] = {
   {"//\\",      "/",    "\\",   "\\",   "//\\", false,  true},
 # endif
 #endif
-#if FILE_SYSTEM_ACCEPTS_DRIVE_LETTER_PREFIX
+#if ISSLASH ('\\')
 # if FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
   {"c:",        "c:",   "",     "c:",   "c:",   false,  false},
   {"c:/",       "c:/",  "",     "c:/",  "c:/",  false,  true},
@@ -105,7 +105,7 @@ static struct test tests[] = {
   {"a/b:c",     "a",    "b:c",  "./b:c","a/b:c",false,  false},
   {"a/b:c/",    "a",    "b:c/", "./b:c/","a/b:c",true,  false},
 # endif
-#else /* ! FILE_SYSTEM_ACCEPTS_DRIVE_LETTER_PREFIX */
+#else /* ! ISSLASH ('\\') */
   {"c:",        ".",    "c:",   "c:",   "c:",   false,  false},
   {"c:/",       ".",    "c:/",  "c:/",  "c:",   true,   false},
   {"c://",      ".",    "c://", "c:/",  "c:",   true,   false},
-- 
1.7.4