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Diffstat (limited to 'gcc/ada/s-wchwts.adb')
| -rw-r--r-- | gcc/ada/s-wchwts.adb | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/gcc/ada/s-wchwts.adb b/gcc/ada/s-wchwts.adb new file mode 100644 index 00000000000..471c8fdb409 --- /dev/null +++ b/gcc/ada/s-wchwts.adb @@ -0,0 +1,165 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUNTIME COMPONENTS -- +-- -- +-- S Y S T E M . W C H _ W T S -- +-- -- +-- B o d y -- +-- -- +-- $Revision: 1.13 $ -- +-- -- +-- Copyright (C) 1992-2000 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). -- +-- -- +------------------------------------------------------------------------------ + +with Interfaces; use Interfaces; +with System.WCh_Con; use System.WCh_Con; +with System.WCh_JIS; use System.WCh_JIS; + +package body System.WCh_WtS is + + --------------------------- + -- Wide_String_To_String -- + --------------------------- + + function Wide_String_To_String + (S : Wide_String; + EM : WC_Encoding_Method) + return String + is + R : String (1 .. 5 * S'Length); -- worst case length! + RP : Natural; + C1 : Character; + C2 : Character; + + begin + RP := 0; + + for SP in S'Range loop + declare + C : constant Wide_Character := S (SP); + CV : constant Unsigned_16 := Wide_Character'Pos (C); + Hex : constant array (Unsigned_16 range 0 .. 15) of Character := + "0123456789ABCDEF"; + + begin + if CV <= 127 then + RP := RP + 1; + R (RP) := Character'Val (CV); + + else + case EM is + + -- Hex ESC sequence encoding + + when WCEM_Hex => + if CV <= 16#FF# then + RP := RP + 1; + R (RP) := Character'Val (CV); + + else + R (RP + 1) := ASCII.ESC; + R (RP + 2) := Hex (Shift_Right (CV, 12)); + R (RP + 3) := Hex (Shift_Right (CV, 8) and 16#000F#); + R (RP + 4) := Hex (Shift_Right (CV, 4) and 16#000F#); + R (RP + 5) := Hex (CV and 16#000F#); + RP := RP + 5; + end if; + + -- Upper bit shift (internal code = external code) + + when WCEM_Upper => + R (RP + 1) := Character'Val (Shift_Right (CV, 8)); + R (RP + 2) := Character'Val (CV and 16#FF#); + RP := RP + 2; + + -- Upper bit shift (EUC) + + when WCEM_EUC => + JIS_To_EUC (C, C1, C2); + R (RP + 1) := C1; + R (RP + 2) := C2; + RP := RP + 2; + + -- Upper bit shift (Shift-JIS) + + when WCEM_Shift_JIS => + JIS_To_Shift_JIS (C, C1, C2); + R (RP + 1) := C1; + R (RP + 2) := C2; + RP := RP + 2; + + -- Upper bit shift (UTF-8) + + -- 16#0080#-16#07ff#: 2#110xxxxx# 2#10xxxxxx# + -- 16#0800#-16#ffff#: 2#1110xxxx# 2#10xxxxxx# 2#10xxxxxx# + + when WCEM_UTF8 => + if CV < 16#0800# then + R (RP + 1) := + Character'Val (2#11000000# or Shift_Right (CV, 6)); + R (RP + 2) := + Character'Val (2#10000000# or (CV and 2#00111111#)); + RP := RP + 2; + + else + R (RP + 1) := + Character'Val (2#11100000# or Shift_Right (CV, 12)); + R (RP + 2) := + Character'Val (2#10000000# or + (Shift_Right (CV, 6) and + 2#00111111#)); + R (RP + 3) := + Character'Val (2#10000000# or (CV and 2#00111111#)); + RP := RP + 3; + end if; + + -- Brackets encoding + + when WCEM_Brackets => + if CV <= 16#FF# then + RP := RP + 1; + R (RP) := Character'Val (CV); + + else + R (RP + 1) := '['; + R (RP + 2) := '"'; + R (RP + 3) := Hex (Shift_Right (CV, 12)); + R (RP + 4) := Hex (Shift_Right (CV, 8) and 16#000F#); + R (RP + 5) := Hex (Shift_Right (CV, 4) and 16#000F#); + R (RP + 6) := Hex (CV and 16#000F#); + R (RP + 7) := '"'; + R (RP + 8) := ']'; + RP := RP + 8; + end if; + + end case; + end if; + end; + end loop; + + return R (1 .. RP); + end Wide_String_To_String; + +end System.WCh_WtS; |