1------------------------------------------------------------------------------
2--                                                                          --
3--                    GNAT RUN-TIME LIBRARY COMPONENTS                      --
4--                                                                          --
5--                S Y S T E M . S T R I N G _ C O M P A R E                 --
6--                                                                          --
7--                                 S p e c                                  --
8--                                                                          --
9--          Copyright (C) 2002-2013, Free Software Foundation, Inc.         --
10--                                                                          --
11-- GNAT is free software;  you can  redistribute it  and/or modify it under --
12-- terms of the  GNU General Public License as published  by the Free Soft- --
13-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
14-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
15-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
16-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
17--                                                                          --
18-- As a special exception under Section 7 of GPL version 3, you are granted --
19-- additional permissions described in the GCC Runtime Library Exception,   --
20-- version 3.1, as published by the Free Software Foundation.               --
21--                                                                          --
22-- You should have received a copy of the GNU General Public License and    --
23-- a copy of the GCC Runtime Library Exception along with this program;     --
24-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
25-- <http://www.gnu.org/licenses/>.                                          --
26--                                                                          --
27-- GNAT was originally developed  by the GNAT team at  New York University. --
28-- Extensive contributions were provided by Ada Core Technologies Inc.      --
29--                                                                          --
30------------------------------------------------------------------------------
31
32--  This package contains functions for runtime comparisons on strings
33
34pragma Compiler_Unit_Warning;
35
36package System.String_Compare is
37
38   function Str_Compare
39     (Left      : System.Address;
40      Right     : System.Address;
41      Left_Len  : Natural;
42      Right_Len : Natural) return Integer;
43   --  Compare the string starting at address Left of length Left_Len
44   --  with the string starting at address Right of length Right_Len.
45   --  The comparison is in the normal Ada semantic sense of string
46   --  comparison. The result is -1,0,+1 for Left<Right, Left=Right,
47   --  Left>Right respectively. This function works with 4 byte words
48   --  if the operands are aligned on 4-byte boundaries and long enough.
49
50   function Str_Compare_Bytes
51     (Left      : System.Address;
52      Right     : System.Address;
53      Left_Len  : Natural;
54      Right_Len : Natural) return Integer;
55   --  Same functionality as Str_Compare but always proceeds by bytes.
56   --  Used when the caller knows that the operands are unaligned, or
57   --  short enough that it makes no sense to go by words.
58
59end System.String_Compare;
60