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 --                                                                          --
  10 --          Copyright (C) 1992-1998 Free Software Foundation, Inc.          --
  11 --                                                                          --
  12 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  20 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, USA.                                                      --
  22 --                                                                          --
  23 -- As a special exception,  if other files  instantiate  generics from this --
  24 -- unit, or you link  this unit with other files  to produce an executable, --
  25 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  26 -- covered  by the  GNU  General  Public  License.  This exception does not --
  27 -- however invalidate  any other reasons why  the executable file  might be --
  28 -- covered by the  GNU Public License.                                      --
  29 --                                                                          --
  30 -- GNAT was originally developed  by the GNAT team at  New York University. --
  31 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 package body System.String_Ops is
  36
  37    ----------------
  38    -- Str_Concat --
  39    ----------------
  40
  41    function Str_Concat (X, Y : String) return String is
  42    begin
  43       if X'Length <= 0 then
  44          return Y;
  45
  46       else
  47          declare
  48             L : constant Natural := X'Length + Y'Length;
  49             R : String (X'First .. X'First + L - 1);
  50
  51          begin
  52             R (X'Range) := X;
  53             R (X'First + X'Length .. R'Last) := Y;
  54             return R;
  55          end;
  56       end if;
  57    end Str_Concat;
  58
  59    -------------------
  60    -- Str_Concat_CC --
  61    -------------------
  62
  63    function Str_Concat_CC (X, Y : Character) return String is
  64       R : String (1 .. 2);
  65
  66    begin
  67       R (1) := X;
  68       R (2) := Y;
  69       return R;
  70    end Str_Concat_CC;
  71
  72    -------------------
  73    -- Str_Concat_CS --
  74    -------------------
  75
  76    function Str_Concat_CS (X : Character; Y : String) return String is
  77       R : String (1 .. Y'Length + 1);
  78
  79    begin
  80       R (1) := X;
  81       R (2 .. R'Last) := Y;
  82       return R;
  83    end Str_Concat_CS;
  84
  85    -------------------
  86    -- Str_Concat_SC --
  87    -------------------
  88
  89    function Str_Concat_SC (X : String; Y : Character) return String is
  90    begin
  91       if X'Length <= 0 then
  92          return (1 => Y);
  93
  94       else
  95          declare
  96             R : String (X'First .. X'Last + 1);
  97
  98          begin
  99             R (X'Range) := X;
 100             R (R'Last) := Y;
 101             return R;
 102          end;
 103       end if;
 104    end Str_Concat_SC;
 105
 106    ---------------
 107    -- Str_Equal --
 108    ---------------
 109
 110    function Str_Equal (A, B : String) return Boolean is
 111    begin
 112       if A'Length /= B'Length then
 113          return False;
 114
 115       else
 116          for J in A'Range loop
 117             if A (J) /= B (J + (B'First - A'First)) then
 118                return False;
 119             end if;
 120          end loop;
 121
 122          return True;
 123       end if;
 124    end Str_Equal;
 125
 126    -------------------
 127    -- Str_Normalize --
 128    -------------------
 129
 130    procedure Str_Normalize (A : in out String) is
 131    begin
 132       for J in A'Range loop
 133          A (J) := Character'Last;
 134       end loop;
 135    end Str_Normalize;
 136
 137    ------------------------
 138    -- Wide_Str_Normalize --
 139    ------------------------
 140
 141    procedure Wide_Str_Normalize (A : in out Wide_String) is
 142    begin
 143       for J in A'Range loop
 144          A (J) := Wide_Character'Last;
 145       end loop;
 146    end Wide_Str_Normalize;
 147
 148 end System.String_Ops;