New Language: Ada

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45957 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 173 insertions, 0 deletions

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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT RUNTIME COMPONENTS                          --
+--                                                                          --
+--                       S Y S T E M . W C H _ J I S                        --
+--                                                                          --
+--                                 B o d y                                  --
+--                                                                          --
+--                            $Revision: 1.5 $                              --
+--                                                                          --
+--        Copyright (C) 1992,1993,1994 Free Software Foundation, Inc.       --
+--                                                                          --
+-- GNAT is free software;  you can  redistribute it  and/or modify it under --
+-- terms of the  GNU General Public License as published  by the Free Soft- --
+-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
+-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT 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  distributed with GNAT;  see file COPYING.  If not, write --
+-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
+-- MA 02111-1307, USA.                                                      --
+--                                                                          --
+-- As a special exception,  if other files  instantiate  generics from this --
+-- unit, or you link  this unit with other files  to produce an executable, --
+-- this  unit  does not  by itself cause  the resulting  executable  to  be --
+-- covered  by the  GNU  General  Public  License.  This exception does not --
+-- however invalidate  any other reasons why  the executable file  might be --
+-- covered by the  GNU Public License.                                      --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
+--                                                                          --
+------------------------------------------------------------------------------
+
+package body System.WCh_JIS is
+
+   type Byte is mod 256;
+
+   EUC_Hankaku_Kana : constant Byte := 16#8E#;
+   --  Prefix byte in EUC for Hankaku Kana (small Katakana). Such characters
+   --  in EUC are represented by a prefix byte followed by the code, which
+   --  is in the upper half (the corresponding JIS internal code is in the
+   --  range 16#0080# - 16#00FF#).
+
+   function EUC_To_JIS (EUC1, EUC2 : Character) return Wide_Character is
+      EUC1B  : constant Byte := Character'Pos (EUC1);
+      EUC2B  : constant Byte := Character'Pos (EUC2);
+
+   begin
+      if EUC2B not in 16#A0# .. 16#FE# then
+         raise Constraint_Error;
+      end if;
+
+      if EUC1B = EUC_Hankaku_Kana then
+         return Wide_Character'Val (EUC2B);
+
+      else
+         if EUC1B not in 16#A0# .. 16#FE# then
+            raise Constraint_Error;
+         else
+            return Wide_Character'Val
+              (256 * Natural (EUC1B and 16#7F#) + Natural (EUC2B and 16#7F#));
+         end if;
+      end if;
+   end EUC_To_JIS;
+
+   ----------------
+   -- JIS_To_EUC --
+   ----------------
+
+   procedure JIS_To_EUC
+     (J    : in Wide_Character;
+      EUC1 : out Character;
+      EUC2 : out Character)
+   is
+      JIS1 : constant Natural := Wide_Character'Pos (J) / 256;
+      JIS2 : constant Natural := Wide_Character'Pos (J) rem 256;
+
+   begin
+      if JIS1 = 0 then
+         EUC1 := Character'Val (EUC_Hankaku_Kana);
+         EUC2 := Character'Val (JIS2);
+
+      else
+         EUC1 := Character'Val (JIS1 + 16#80#);
+         EUC2 := Character'Val (JIS2 + 16#80#);
+      end if;
+   end JIS_To_EUC;
+
+   ----------------------
+   -- JIS_To_Shift_JIS --
+   ----------------------
+
+   procedure JIS_To_Shift_JIS
+     (J   : in Wide_Character;
+      SJ1 : out Character;
+      SJ2 : out Character)
+   is
+      JIS1 : Byte;
+      JIS2 : Byte;
+
+   begin
+      --  The following is the required algorithm, it's hard to make any
+      --  more intelligent comments! This was copied from a public domain
+      --  C program called etos.c (author unknown).
+
+      JIS1 := Byte (Natural (Wide_Character'Pos (J) / 256));
+      JIS2 := Byte (Natural (Wide_Character'Pos (J) rem 256));
+
+      if JIS1 > 16#5F# then
+         JIS1 := JIS1 + 16#80#;
+      end if;
+
+      if (JIS1 mod 2) = 0 then
+         SJ1 := Character'Val ((JIS1 - 16#30#) / 2 + 16#88#);
+         SJ2 := Character'Val (JIS2 + 16#7E#);
+
+      else
+         if JIS2 >= 16#60# then
+            JIS2 := JIS2 + 16#01#;
+         end if;
+
+         SJ1 := Character'Val ((JIS1 - 16#31#) / 2 + 16#89#);
+         SJ2 := Character'Val (JIS2 + 16#1F#);
+      end if;
+   end JIS_To_Shift_JIS;
+
+   ----------------------
+   -- Shift_JIS_To_JIS --
+   ----------------------
+
+   function Shift_JIS_To_JIS (SJ1, SJ2 : Character) return Wide_Character is
+      SJIS1 : Byte;
+      SJIS2 : Byte;
+      JIS1  : Byte;
+      JIS2  : Byte;
+
+   begin
+      --  The following is the required algorithm, it's hard to make any
+      --  more intelligent comments! This was copied from a public domain
+      --  C program called stoj.c written by shige@csk.JUNET.
+
+      SJIS1 := Character'Pos (SJ1);
+      SJIS2 := Character'Pos (SJ2);
+
+      if SJIS1 >= 16#E0# then
+         SJIS1 := SJIS1 - 16#40#;
+      end if;
+
+      if SJIS2 >= 16#9F# then
+         JIS1 := (SJIS1 - 16#88#) * 2 + 16#30#;
+         JIS2 := SJIS2 - 16#7E#;
+
+      else
+         if SJIS2 >= 16#7F# then
+            SJIS2 := SJIS2 - 16#01#;
+         end if;
+
+         JIS1 := (SJIS1 - 16#89#) * 2 + 16#31#;
+         JIS2 := SJIS2 - 16#1F#;
+      end if;
+
+      if JIS1 not in 16#20# .. 16#7E#
+        or else JIS2 not in 16#20# .. 16#7E#
+      then
+         raise Constraint_Error;
+      else
+         return Wide_Character'Val (256 * Natural (JIS1) + Natural (JIS2));
+      end if;
+   end Shift_JIS_To_JIS;
+
+end System.WCh_JIS;