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Diffstat (limited to 'gcc/ada/s-valcha.adb')
| -rw-r--r-- | gcc/ada/s-valcha.adb | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/gcc/ada/s-valcha.adb b/gcc/ada/s-valcha.adb new file mode 100644 index 00000000000..31bcbd3e91c --- /dev/null +++ b/gcc/ada/s-valcha.adb @@ -0,0 +1,77 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT COMPILER COMPONENTS -- +-- -- +-- S Y S T E M . V A L _ C H A R -- +-- -- +-- B o d y -- +-- -- +-- $Revision: 1.8 $ -- +-- -- +-- 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). -- +-- -- +------------------------------------------------------------------------------ + +with System.Val_Util; use System.Val_Util; + +package body System.Val_Char is + + --------------------- + -- Value_Character -- + --------------------- + + function Value_Character (Str : String) return Character is + F : Natural; + L : Natural; + S : String (Str'Range) := Str; + + begin + Normalize_String (S, F, L); + + -- Accept any single character enclosed in quotes + + if L - F = 2 and then S (F) = ''' and then S (L) = ''' then + return Character'Val (Character'Pos (S (F + 1))); + + -- Check control character cases + + else + for C in Character'Val (16#00#) .. Character'Val (16#1F#) loop + if S (F .. L) = Character'Image (C) then + return C; + end if; + end loop; + + for C in Character'Val (16#7F#) .. Character'Val (16#9F#) loop + if S (F .. L) = Character'Image (C) then + return C; + end if; + end loop; + + raise Constraint_Error; + end if; + + end Value_Character; + +end System.Val_Char; |