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Diffstat (limited to 'gcc-4.4.3/gcc/ada/a-shcain.adb')
-rw-r--r-- | gcc-4.4.3/gcc/ada/a-shcain.adb | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/gcc-4.4.3/gcc/ada/a-shcain.adb b/gcc-4.4.3/gcc/ada/a-shcain.adb new file mode 100644 index 000000000..40ad73e9e --- /dev/null +++ b/gcc-4.4.3/gcc/ada/a-shcain.adb @@ -0,0 +1,53 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT LIBRARY COMPONENTS -- +-- -- +-- A D A . S T R I N G S . H A S H _ C A S E _ I N S E N S I T I V E -- +-- -- +-- B o d y -- +-- -- +-- Copyright (C) 2004-2009, 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 3, 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. -- +-- -- +-- As a special exception under Section 7 of GPL version 3, you are granted -- +-- additional permissions described in the GCC Runtime Library Exception, -- +-- version 3.1, as published by the Free Software Foundation. -- +-- -- +-- You should have received a copy of the GNU General Public License and -- +-- a copy of the GCC Runtime Library Exception along with this program; -- +-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- +-- <http://www.gnu.org/licenses/>. -- +-- -- +-- This unit was originally developed by Matthew J Heaney. -- +------------------------------------------------------------------------------ + +with Ada.Characters.Handling; use Ada.Characters.Handling; + +-- Note: source of this algorithm: GNAT.HTable.Hash (g-htable.adb) + +function Ada.Strings.Hash_Case_Insensitive + (Key : String) return Containers.Hash_Type +is + use Ada.Containers; + + Tmp : Hash_Type; + + function Rotate_Left + (Value : Hash_Type; + Amount : Natural) return Hash_Type; + pragma Import (Intrinsic, Rotate_Left); + +begin + Tmp := 0; + for J in Key'Range loop + Tmp := Rotate_Left (Tmp, 3) + Character'Pos (To_Lower (Key (J))); + end loop; + + return Tmp; +end Ada.Strings.Hash_Case_Insensitive; |