File : a-slcain.adb
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT LIBRARY COMPONENTS --
4 -- --
5 -- ADA.STRINGS.LESS_CASE_INSENSITIVE --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 2004-2009, 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 -- --
19 -- --
20 -- --
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 -- This unit was originally developed by Matthew J Heaney. --
28 ------------------------------------------------------------------------------
29
30 with Ada.Characters.Handling; use Ada.Characters.Handling;
31
32 function Ada.Strings.Less_Case_Insensitive
33 (Left, Right : String) return Boolean
34 is
35 LI : Integer := Left'First;
36 RI : Integer := Right'First;
37
38 LC, RC : Character;
39
40 begin
41 if LI > Left'Last then
42 return RI <= Right'Last;
43 end if;
44
45 if RI > Right'Last then
46 return False;
47 end if;
48
49 loop
50 LC := To_Lower (Left (LI));
51 RC := To_Lower (Right (RI));
52
53 if LC < RC then
54 return True;
55 end if;
56
57 if LC > RC then
58 return False;
59 end if;
60
61 if LI = Left'Last then
62 return RI < Right'Last;
63 end if;
64
65 if RI = Right'Last then
66 return False;
67 end if;
68
69 LI := LI + 1;
70 RI := RI + 1;
71 end loop;
72 end Ada.Strings.Less_Case_Insensitive;