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Diffstat (limited to 'gcc/ada/s-wchstw.adb')
| -rw-r--r-- | gcc/ada/s-wchstw.adb | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/gcc/ada/s-wchstw.adb b/gcc/ada/s-wchstw.adb new file mode 100644 index 00000000000..ad9d095e688 --- /dev/null +++ b/gcc/ada/s-wchstw.adb @@ -0,0 +1,221 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUNTIME COMPONENTS -- +-- -- +-- S Y S T E M . W C H _ S T W -- +-- -- +-- B o d y -- +-- -- +-- $Revision: 1.14 $ +-- -- +-- 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_StW is + + --------------------------- + -- String_To_Wide_String -- + --------------------------- + + function String_To_Wide_String + (S : String; + EM : WC_Encoding_Method) + return Wide_String + is + R : Wide_String (1 .. S'Length); + RP : Natural; + SP : Natural; + U1 : Unsigned_16; + U2 : Unsigned_16; + U3 : Unsigned_16; + U : Unsigned_16; + + Last : constant Natural := S'Last; + + function Get_Hex (C : Character) return Unsigned_16; + -- Converts character from hex digit to value in range 0-15. The + -- input must be in 0-9, A-F, or a-f, and no check is needed. + + procedure Get_Hex_4; + -- Translates four hex characters starting at S (SP) to a single + -- wide character. Used in WCEM_Hex and WCEM_Brackets mode. SP + -- is not modified by the call. The resulting wide character value + -- is stored in R (RP). RP is not modified by the call. + + function Get_Hex (C : Character) return Unsigned_16 is + begin + if C in '0' .. '9' then + return Character'Pos (C) - Character'Pos ('0'); + elsif C in 'A' .. 'F' then + return Character'Pos (C) - Character'Pos ('A') + 10; + else + return Character'Pos (C) - Character'Pos ('a') + 10; + end if; + end Get_Hex; + + procedure Get_Hex_4 is + begin + R (RP) := Wide_Character'Val ( + Get_Hex (S (SP + 3)) + 16 * + (Get_Hex (S (SP + 2)) + 16 * + (Get_Hex (S (SP + 1)) + 16 * + (Get_Hex (S (SP + 0)))))); + end Get_Hex_4; + + -- Start of processing for String_To_Wide_String + + begin + SP := S'First; + RP := 0; + + case EM is + + -- ESC-Hex representation + + when WCEM_Hex => + while SP <= Last - 4 loop + RP := RP + 1; + + if S (SP) = ASCII.ESC then + SP := SP + 1; + Get_Hex_4; + SP := SP + 4; + else + R (RP) := Wide_Character'Val (Character'Pos (S (SP))); + SP := SP + 1; + end if; + end loop; + + -- Upper bit shift, internal code = external code + + when WCEM_Upper => + while SP < Last loop + RP := RP + 1; + + if S (SP) >= Character'Val (16#80#) then + U1 := Character'Pos (S (SP)); + U2 := Character'Pos (S (SP + 1)); + R (RP) := Wide_Character'Val (256 * U1 + U2); + SP := SP + 2; + else + R (RP) := Wide_Character'Val (Character'Pos (S (SP))); + SP := SP + 1; + end if; + end loop; + + -- Upper bit shift, shift-JIS + + when WCEM_Shift_JIS => + while SP < Last loop + RP := RP + 1; + + if S (SP) >= Character'Val (16#80#) then + R (RP) := Shift_JIS_To_JIS (S (SP), S (SP + 1)); + SP := SP + 2; + else + R (RP) := Wide_Character'Val (Character'Pos (S (SP))); + SP := SP + 1; + end if; + end loop; + + -- Upper bit shift, EUC + + when WCEM_EUC => + while SP < Last loop + RP := RP + 1; + + if S (SP) >= Character'Val (16#80#) then + R (RP) := EUC_To_JIS (S (SP), S (SP + 1)); + SP := SP + 2; + else + R (RP) := Wide_Character'Val (Character'Pos (S (SP))); + SP := SP + 1; + end if; + end loop; + + -- Upper bit shift, UTF-8 + + when WCEM_UTF8 => + while SP < Last loop + RP := RP + 1; + + if S (SP) >= Character'Val (16#80#) then + U1 := Character'Pos (S (SP)); + U2 := Character'Pos (S (SP + 1)); + + U := Shift_Left (U1 and 2#00011111#, 6) + + (U2 and 2#00111111#); + SP := SP + 2; + + if U1 >= 2#11100000# then + U3 := Character'Pos (S (SP)); + U := Shift_Left (U, 6) + (U3 and 2#00111111#); + SP := SP + 1; + end if; + + R (RP) := Wide_Character'Val (U); + + else + R (RP) := Wide_Character'Val (Character'Pos (S (SP))); + SP := SP + 1; + end if; + end loop; + + -- Brackets representation + + when WCEM_Brackets => + while SP <= Last - 7 loop + RP := RP + 1; + + if S (SP) = '[' + and then S (SP + 1) = '"' + and then S (SP + 2) /= '"' + then + SP := SP + 2; + Get_Hex_4; + SP := SP + 6; + + else + R (RP) := Wide_Character'Val (Character'Pos (S (SP))); + SP := SP + 1; + end if; + end loop; + + end case; + + while SP <= Last loop + RP := RP + 1; + R (RP) := Wide_Character'Val (Character'Pos (S (SP))); + SP := SP + 1; + end loop; + + return R (1 .. RP); + end String_To_Wide_String; + +end System.WCh_StW; |