File : s-strops.adb
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 -- --
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 -- 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
36 pragma Compiler_Unit_Warning;
37
38 package 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
109 end System.String_Ops;