1 files changed, 96 insertions, 0 deletions
diff --git a/grub-core/osdep/windows/relpath.c b/grub-core/osdep/windows/relpath.c
new file mode 100644
index 0000000..478e8ef
--- /dev/null
+++ b/grub-core/osdep/windows/relpath.c
@@ -0,0 +1,96 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 1999,2000,2001,2002,2003,2006,2007,2008,2009,2010,2011,2012,2013  Free Software Foundation, Inc.
+ *
+ *  GRUB 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.
+ *
+ *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config-util.h>
+#include <config.h>
+
+#include <grub/types.h>
+
+#include <grub/util/misc.h>
+
+#include <grub/mm.h>
+#include <grub/misc.h>
+#include <grub/emu/misc.h>
+#include <grub/emu/hostdisk.h>
+#include <grub/emu/getroot.h>
+#include <grub/charset.h>
+#include <grub/util/windows.h>
+#include <windows.h>
+#include <winioctl.h>
+
+static size_t
+tclen (const TCHAR *s)
+{
+  const TCHAR *s0 = s;
+  while (*s)
+      s++;
+  return s - s0;
+}
+
+char *
+grub_make_system_path_relative_to_its_root (const char *path)
+{
+  TCHAR *dirwindows, *mntpointwindows;
+  TCHAR *ptr;
+  size_t offset, flen;
+  TCHAR *ret;
+  char *cret;
+
+  dirwindows = grub_util_get_windows_path (path);
+  if (!dirwindows)
+    return xstrdup (path);
+
+  mntpointwindows = grub_get_mount_point (dirwindows);
+
+  if (!mntpointwindows)
+    {
+      offset = 0;
+      if (dirwindows[0] && dirwindows[1] == ':')
+	offset = 2;
+    }
+  offset = tclen (mntpointwindows);
+  free (mntpointwindows);
+  flen = tclen (dirwindows);
+  if (offset > flen)
+    {
+      offset = 0;
+      if (dirwindows[0] && dirwindows[1] == ':')
+	offset = 2;
+    }
+  ret = xcalloc (flen - offset + 2, sizeof (ret[0]));
+  if (dirwindows[offset] != '\\'
+      && dirwindows[offset] != '/'
+      && dirwindows[offset])
+    {
+      ret[0] = '\\';
+      memcpy (ret + 1, dirwindows + offset, (flen - offset + 1) * sizeof (ret[0]));
+    }
+  else
+    memcpy (ret, dirwindows + offset, (flen - offset + 1) * sizeof (ret[0]));
+
+  free (dirwindows);
+
+  for (ptr = ret; *ptr; ptr++)
+    if (*ptr == '\\')
+      *ptr = '/';
+
+  cret = grub_util_tchar_to_utf8 (ret);
+  free (ret);
+
+  return cret;
+}