gcc/ada/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) 1992-2009, 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 -- 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
  36 pragma Warnings (Off);
  37 pragma Compiler_Unit;
  38 pragma Warnings (On);
  39
  40 package body System.String_Ops is
  41
  42    ----------------
  43    -- Str_Concat --
  44    ----------------
  45
  46    function Str_Concat (X, Y : String) return String is
  47    begin
  48       if X'Length = 0 then
  49          return Y;
  50
  51       else
  52          declare
  53             L : constant Natural := X'Length + Y'Length;
  54             R : String (X'First .. X'First + L - 1);
  55
  56          begin
  57             R (X'Range) := X;
  58             R (X'First + X'Length .. R'Last) := Y;
  59             return R;
  60          end;
  61       end if;
  62    end Str_Concat;
  63
  64    -------------------
  65    -- Str_Concat_CC --
  66    -------------------
  67
  68    function Str_Concat_CC (X, Y : Character) return String is
  69       R : String (1 .. 2);
  70
  71    begin
  72       R (1) := X;
  73       R (2) := Y;
  74       return R;
  75    end Str_Concat_CC;
  76
  77    -------------------
  78    -- Str_Concat_CS --
  79    -------------------
  80
  81    function Str_Concat_CS (X : Character; Y : String) return String is
  82       R : String (1 .. Y'Length + 1);
  83
  84    begin
  85       R (1) := X;
  86       R (2 .. R'Last) := Y;
  87       return R;
  88    end Str_Concat_CS;
  89
  90    -------------------
  91    -- Str_Concat_SC --
  92    -------------------
  93
  94    function Str_Concat_SC (X : String; Y : Character) return String is
  95    begin
  96       if X'Length = 0 then
  97          return (1 => Y);
  98
  99       else
 100          declare
 101             R : String (X'First .. X'Last + 1);
 102
 103          begin
 104             R (X'Range) := X;
 105             R (R'Last) := Y;
 106             return R;
 107          end;
 108       end if;
 109    end Str_Concat_SC;
 110
 111 end System.String_Ops;