gcc/ada/a-suteio.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --         A D A . S T R I N G S . U N B O U N D E D . T E X T _ I O        --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1997-2005, 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,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, 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 with Ada.Text_IO; use Ada.Text_IO;
  35
  36 package body Ada.Strings.Unbounded.Text_IO is
  37
  38    --------------
  39    -- Get_Line --
  40    --------------
  41
  42    function Get_Line return Unbounded_String is
  43       Buffer : String (1 .. 1000);
  44       Last   : Natural;
  45       Str1   : String_Access;
  46       Str2   : String_Access;
  47       Result : Unbounded_String;
  48
  49    begin
  50       Get_Line (Buffer, Last);
  51       Str1 := new String'(Buffer (1 .. Last));
  52       while Last = Buffer'Last loop
  53          Get_Line (Buffer, Last);
  54          Str2 := new String'(Str1.all & 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 (File : Ada.Text_IO.File_Type) return Unbounded_String is
  65       Buffer : String (1 .. 1000);
  66       Last   : Natural;
  67       Str1   : String_Access;
  68       Str2   : String_Access;
  69       Result : Unbounded_String;
  70
  71    begin
  72       Get_Line (File, Buffer, Last);
  73       Str1 := new String'(Buffer (1 .. Last));
  74       while Last = Buffer'Last loop
  75          Get_Line (File, Buffer, Last);
  76          Str2 := new String'(Str1.all & Buffer (1 .. Last));
  77          Free (Str1);
  78          Str1 := Str2;
  79       end loop;
  80
  81       Result.Reference := Str1;
  82       Result.Last      := Str1'Length;
  83       return Result;
  84    end Get_Line;
  85
  86    procedure Get_Line (Item : out Unbounded_String) is
  87    begin
  88       Get_Line (Current_Input, Item);
  89    end Get_Line;
  90
  91    procedure Get_Line
  92      (File : Ada.Text_IO.File_Type;
  93       Item : out Unbounded_String)
  94    is
  95    begin
  96       --  We are going to read into the string that is already there and
  97       --  allocated. Hopefully it is big enough now, if not, we will extend
  98       --  it in the usual manner using Realloc_For_Chunk.
  99
 100       --  Make sure we start with at least 80 characters
 101
 102       if Item.Reference'Last < 80 then
 103          Realloc_For_Chunk (Item, 80);
 104       end if;
 105
 106       --  Loop to read data, filling current string as far as possible.
 107       --  Item.Last holds the number of characters read so far.
 108
 109       Item.Last := 0;
 110       loop
 111          Get_Line
 112            (File,
 113             Item.Reference (Item.Last + 1 .. Item.Reference'Last),
 114             Item.Last);
 115
 116          --  If we hit the end of the line before the end of the buffer, then
 117          --  we are all done, and the result length is properly set.
 118
 119          if Item.Last < Item.Reference'Last then
 120             return;
 121          end if;
 122
 123          --  If not enough room, double it and keep reading
 124
 125          Realloc_For_Chunk (Item, Item.Last);
 126       end loop;
 127    end Get_Line;
 128
 129    ---------
 130    -- Put --
 131    ---------
 132
 133    procedure Put (U : Unbounded_String) is
 134    begin
 135       Put (U.Reference (1 .. U.Last));
 136    end Put;
 137
 138    procedure Put (File : File_Type; U : Unbounded_String) is
 139    begin
 140       Put (File, U.Reference (1 .. U.Last));
 141    end Put;
 142
 143    --------------
 144    -- Put_Line --
 145    --------------
 146
 147    procedure Put_Line (U : Unbounded_String) is
 148    begin
 149       Put_Line (U.Reference (1 .. U.Last));
 150    end Put_Line;
 151
 152    procedure Put_Line (File : File_Type; U : Unbounded_String) is
 153    begin
 154       Put_Line (File, U.Reference (1 .. U.Last));
 155    end Put_Line;
 156
 157 end Ada.Strings.Unbounded.Text_IO;