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+# cp932.awk -- Add sort key at the tail of each line of CP932-2BYTE.map.
+# Copyright (C) 2004
+#   National Institute of Advanced Industrial Science and Technology (AIST)
+#   Registration Number H13PRO009
+#
+# This file is part of GNU Emacs.
+#
+# GNU Emacs 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 2, or (at your option)
+# any later version.
+#
+# GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to the
+# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+# Boston, MA 02111-1307, USA.
+
+# Comment:
+# Add a sort key 0, 1, 2, or 3 at the tail of each line as a comment
+# to realize the round trip mapping to Unicode works as described in
+# this page:
+#      http://support.microsoft.com/default.aspx?scid=kb;EN-US;170559
+# Each sort key means as below:
+#   0: JISX0208 characters.
+#   1: NEC special characters.
+#   2: IBM extension characters.
+#   3: NEC selection of IBM extension characters.
+
+BEGIN {
+  tohex["A"] = 10;
+  tohex["B"] = 11;
+  tohex["C"] = 12;
+  tohex["D"] = 13;
+  tohex["E"] = 14;
+  tohex["F"] = 15;
+}
+
+function decode_hex(str) {
+  n = 0;
+  len = length(str);
+  for (i = 1; i <= len; i++)
+    {
+      c = substr(str, i, 1);
+      if (c >= "0" && c <= "9")
+       n = n * 16 + (c - "0");
+      else
+       n = n * 16 + tohex[c];
+    }
+  return n;
+}
+
+function sjis_to_jis_ku(code)
+{
+  s1 = int(code / 256);
+  s2 = code % 256;
+  if (s2 >= 159)               # s2 >= 0x9F
+    {
+      if (s1 >= 224)           # s1 >= 0xE0
+       j1 = s1 * 2 - 352;      # j1 = s1 * 2 - 0x160
+      else
+       j1 = s1 * 2 - 224;      # j1 = s1 * 2 - 0xE0
+    }
+  else
+    {
+      if (s1 >= 224)
+       j1 = s1 * 2 - 353;      # j1 = s1 * 2 - 0x161
+      else
+       j1 = s1 * 2 - 225;      # j1 = s1 * 2 - 0xE1
+    }
+  return j1 - 32;
+}
+
+/^0x[89E]/ {
+  sjis=decode_hex(substr($1, 3, 4))
+  ku=sjis_to_jis_ku(sjis);
+  if (ku == 13)
+    print $0" # 1";
+  else if (ku >= 89 && ku <= 92)
+    print $0" # 3";
+  else
+    print $0" # 0";
+  next;
+}
+
+/^0xF/ {
+  print $0" # 2";
+  next;
+}
+
+{
+  print;
+}