gcc/ada/s-strops.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                GNU ADA RUNTIME 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) 1992-2005 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 2,  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.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, USA.                                                      --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 package body System.String_Ops is
  35
  36    ----------------
  37    -- Str_Concat --
  38    ----------------
  39
  40    function Str_Concat (X, Y : String) return String is
  41    begin
  42       if X'Length <= 0 then
  43          return Y;
  44
  45       else
  46          declare
  47             L : constant Natural := X'Length + Y'Length;
  48             R : String (X'First .. X'First + L - 1);
  49
  50          begin
  51             R (X'Range) := X;
  52             R (X'First + X'Length .. R'Last) := Y;
  53             return R;
  54          end;
  55       end if;
  56    end Str_Concat;
  57
  58    -------------------
  59    -- Str_Concat_CC --
  60    -------------------
  61
  62    function Str_Concat_CC (X, Y : Character) return String is
  63       R : String (1 .. 2);
  64
  65    begin
  66       R (1) := X;
  67       R (2) := Y;
  68       return R;
  69    end Str_Concat_CC;
  70
  71    -------------------
  72    -- Str_Concat_CS --
  73    -------------------
  74
  75    function Str_Concat_CS (X : Character; Y : String) return String is
  76       R : String (1 .. Y'Length + 1);
  77
  78    begin
  79       R (1) := X;
  80       R (2 .. R'Last) := Y;
  81       return R;
  82    end Str_Concat_CS;
  83
  84    -------------------
  85    -- Str_Concat_SC --
  86    -------------------
  87
  88    function Str_Concat_SC (X : String; Y : Character) return String is
  89    begin
  90       if X'Length <= 0 then
  91          return (1 => Y);
  92
  93       else
  94          declare
  95             R : String (X'First .. X'Last + 1);
  96
  97          begin
  98             R (X'Range) := X;
  99             R (R'Last) := Y;
 100             return R;
 101          end;
 102       end if;
 103    end Str_Concat_SC;
 104
 105 end System.String_Ops;