gcc/ada/libgnat/a-szuzti.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --             ADA.STRINGS.WIDE_WIDE_UNBOUNDED.WIDE_WIDE_TEXT_IO            --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1997-2018, 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 with Ada.Wide_Wide_Text_IO; use Ada.Wide_Wide_Text_IO;
  33
  34 package body Ada.Strings.Wide_Wide_Unbounded.Wide_Wide_Text_IO is
  35
  36    --------------
  37    -- Get_Line --
  38    --------------
  39
  40    function Get_Line return Unbounded_Wide_Wide_String is
  41       Buffer : Wide_Wide_String (1 .. 1000);
  42       Last   : Natural;
  43       Str1   : Wide_Wide_String_Access;
  44       Str2   : Wide_Wide_String_Access;
  45       Result : Unbounded_Wide_Wide_String;
  46
  47    begin
  48       Get_Line (Buffer, Last);
  49       Str1 := new Wide_Wide_String'(Buffer (1 .. Last));
  50       while Last = Buffer'Last loop
  51          Get_Line (Buffer, Last);
  52          Str2 := new Wide_Wide_String (1 .. Str1'Last + Last);
  53          Str2 (Str1'Range) := Str1.all;
  54          Str2 (Str1'Last + 1 .. Str2'Last) := Buffer (1 .. Last);
  55          Free (Str1);
  56          Str1 := Str2;
  57       end loop;
  58
  59       Result.Reference := Str1;
  60       Result.Last      := Str1'Length;
  61       return Result;
  62    end Get_Line;
  63
  64    function Get_Line
  65      (File : Ada.Wide_Wide_Text_IO.File_Type) return Unbounded_Wide_Wide_String
  66    is
  67       Buffer : Wide_Wide_String (1 .. 1000);
  68       Last   : Natural;
  69       Str1   : Wide_Wide_String_Access;
  70       Str2   : Wide_Wide_String_Access;
  71       Result : Unbounded_Wide_Wide_String;
  72
  73    begin
  74       Get_Line (File, Buffer, Last);
  75       Str1 := new Wide_Wide_String'(Buffer (1 .. Last));
  76
  77       while Last = Buffer'Last loop
  78          Get_Line (File, Buffer, Last);
  79          Str2 := new Wide_Wide_String (1 .. Str1'Last + Last);
  80          Str2 (Str1'Range) := Str1.all;
  81          Str2 (Str1'Last + 1 .. Str2'Last) := Buffer (1 .. Last);
  82          Free (Str1);
  83          Str1 := Str2;
  84       end loop;
  85
  86       Result.Reference := Str1;
  87       Result.Last      := Str1'Length;
  88       return Result;
  89    end Get_Line;
  90
  91    procedure Get_Line (Item : out Unbounded_Wide_Wide_String) is
  92    begin
  93       Get_Line (Current_Input, Item);
  94    end Get_Line;
  95
  96    procedure Get_Line
  97      (File : Ada.Wide_Wide_Text_IO.File_Type;
  98       Item : out Unbounded_Wide_Wide_String)
  99    is
 100    begin
 101       --  We are going to read into the string that is already there and
 102       --  allocated. Hopefully it is big enough now, if not, we will extend
 103       --  it in the usual manner using Realloc_For_Chunk.
 104
 105       --  Make sure we start with at least 80 characters
 106
 107       if Item.Reference'Last < 80 then
 108          Realloc_For_Chunk (Item, 80);
 109       end if;
 110
 111       --  Loop to read data, filling current string as far as possible.
 112       --  Item.Last holds the number of characters read so far.
 113
 114       Item.Last := 0;
 115       loop
 116          Get_Line
 117            (File,
 118             Item.Reference (Item.Last + 1 .. Item.Reference'Last),
 119             Item.Last);
 120
 121          --  If we hit the end of the line before the end of the buffer, then
 122          --  we are all done, and the result length is properly set.
 123
 124          if Item.Last < Item.Reference'Last then
 125             return;
 126          end if;
 127
 128          --  If not enough room, double it and keep reading
 129
 130          Realloc_For_Chunk (Item, Item.Last);
 131       end loop;
 132    end Get_Line;
 133
 134    ---------
 135    -- Put --
 136    ---------
 137
 138    procedure Put (U : Unbounded_Wide_Wide_String) is
 139    begin
 140       Put (U.Reference (1 .. U.Last));
 141    end Put;
 142
 143    procedure Put (File : File_Type; U : Unbounded_Wide_Wide_String) is
 144    begin
 145       Put (File, U.Reference (1 .. U.Last));
 146    end Put;
 147
 148    --------------
 149    -- Put_Line --
 150    --------------
 151
 152    procedure Put_Line (U : Unbounded_Wide_Wide_String) is
 153    begin
 154       Put_Line (U.Reference (1 .. U.Last));
 155    end Put_Line;
 156
 157    procedure Put_Line (File : File_Type; U : Unbounded_Wide_Wide_String) is
 158    begin
 159       Put_Line (File, U.Reference (1 .. U.Last));
 160    end Put_Line;
 161
 162 end Ada.Strings.Wide_Wide_Unbounded.Wide_Wide_Text_IO;