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