1------------------------------------------------------------------------------
2--                                                                          --
3--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
4--                                                                          --
5--                    S Y S T E M . S T R I N G _ O P S                     --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--          Copyright (C) 1992-2013, 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--  NOTE: This package is obsolescent. It is no longer used by the compiler
33--  which now generates concatenation inline. It is retained only because
34--  it may be used during bootstrapping using old versions of the compiler.
35
36pragma Compiler_Unit_Warning;
37
38package body System.String_Ops is
39
40   ----------------
41   -- Str_Concat --
42   ----------------
43
44   function Str_Concat (X, Y : String) return String is
45   begin
46      if X'Length = 0 then
47         return Y;
48
49      else
50         declare
51            L : constant Natural := X'Length + Y'Length;
52            R : String (X'First .. X'First + L - 1);
53
54         begin
55            R (X'Range) := X;
56            R (X'First + X'Length .. R'Last) := Y;
57            return R;
58         end;
59      end if;
60   end Str_Concat;
61
62   -------------------
63   -- Str_Concat_CC --
64   -------------------
65
66   function Str_Concat_CC (X, Y : Character) return String is
67      R : String (1 .. 2);
68
69   begin
70      R (1) := X;
71      R (2) := Y;
72      return R;
73   end Str_Concat_CC;
74
75   -------------------
76   -- Str_Concat_CS --
77   -------------------
78
79   function Str_Concat_CS (X : Character; Y : String) return String is
80      R : String (1 .. Y'Length + 1);
81
82   begin
83      R (1) := X;
84      R (2 .. R'Last) := Y;
85      return R;
86   end Str_Concat_CS;
87
88   -------------------
89   -- Str_Concat_SC --
90   -------------------
91
92   function Str_Concat_SC (X : String; Y : Character) return String is
93   begin
94      if X'Length = 0 then
95         return (1 => Y);
96
97      else
98         declare
99            R : String (X'First .. X'Last + 1);
100
101         begin
102            R (X'Range) := X;
103            R (R'Last) := Y;
104            return R;
105         end;
106      end if;
107   end Str_Concat_SC;
108
109end System.String_Ops;
110