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 --                            $Revision: 1.1.16.1 $
  10 --                                                                          --
  11 --          Copyright (C) 1992-1998 Free Software Foundation, Inc.          --
  12 --                                                                          --
  13 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  14 -- terms of the  GNU General Public License as published  by the Free Soft- --
  15 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  16 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  17 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  18 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  19 -- for  more details.  You should have  received  a copy of the GNU General --
  20 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  21 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  22 -- MA 02111-1307, USA.                                                      --
  23 --                                                                          --
  24 -- As a special exception,  if other files  instantiate  generics from this --
  25 -- unit, or you link  this unit with other files  to produce an executable, --
  26 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  27 -- covered  by the  GNU  General  Public  License.  This exception does not --
  28 -- however invalidate  any other reasons why  the executable file  might be --
  29 -- covered by the  GNU Public License.                                      --
  30 --                                                                          --
  31 -- GNAT was originally developed  by the GNAT team at  New York University. --
  32 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 package body System.String_Ops is
  37
  38    ----------------
  39    -- Str_Concat --
  40    ----------------
  41
  42    function Str_Concat (X, Y : String) return String is
  43    begin
  44       if X'Length <= 0 then
  45          return Y;
  46
  47       else
  48          declare
  49             L : constant Natural := X'Length + Y'Length;
  50             R : String (X'First .. X'First + L - 1);
  51
  52          begin
  53             R (X'Range) := X;
  54             R (X'First + X'Length .. R'Last) := Y;
  55             return R;
  56          end;
  57       end if;
  58    end Str_Concat;
  59
  60    -------------------
  61    -- Str_Concat_CC --
  62    -------------------
  63
  64    function Str_Concat_CC (X, Y : Character) return String is
  65       R : String (1 .. 2);
  66
  67    begin
  68       R (1) := X;
  69       R (2) := Y;
  70       return R;
  71    end Str_Concat_CC;
  72
  73    -------------------
  74    -- Str_Concat_CS --
  75    -------------------
  76
  77    function Str_Concat_CS (X : Character; Y : String) return String is
  78       R : String (1 .. Y'Length + 1);
  79
  80    begin
  81       R (1) := X;
  82       R (2 .. R'Last) := Y;
  83       return R;
  84    end Str_Concat_CS;
  85
  86    -------------------
  87    -- Str_Concat_SC --
  88    -------------------
  89
  90    function Str_Concat_SC (X : String; Y : Character) return String is
  91    begin
  92       if X'Length <= 0 then
  93          return (1 => Y);
  94
  95       else
  96          declare
  97             R : String (X'First .. X'Last + 1);
  98
  99          begin
 100             R (X'Range) := X;
 101             R (R'Last) := Y;
 102             return R;
 103          end;
 104       end if;
 105    end Str_Concat_SC;
 106
 107    ---------------
 108    -- Str_Equal --
 109    ---------------
 110
 111    function Str_Equal (A, B : String) return Boolean is
 112    begin
 113       if A'Length /= B'Length then
 114          return False;
 115
 116       else
 117          for J in A'Range loop
 118             if A (J) /= B (J + (B'First - A'First)) then
 119                return False;
 120             end if;
 121          end loop;
 122
 123          return True;
 124       end if;
 125    end Str_Equal;
 126
 127    -------------------
 128    -- Str_Normalize --
 129    -------------------
 130
 131    procedure Str_Normalize (A : in out String) is
 132    begin
 133       for J in A'Range loop
 134          A (J) := Character'Last;
 135       end loop;
 136    end Str_Normalize;
 137
 138    ------------------------
 139    -- Wide_Str_Normalize --
 140    ------------------------
 141
 142    procedure Wide_Str_Normalize (A : in out Wide_String) is
 143    begin
 144       for J in A'Range loop
 145          A (J) := Wide_Character'Last;
 146       end loop;
 147    end Wide_Str_Normalize;
 148
 149 end System.String_Ops;