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) 1997-2009, 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.Text_IO; use Ada.Text_IO;
  33
  34 package body Ada.Strings.Unbounded.Text_IO is
  35
  36    --------------
  37    -- Get_Line --
  38    --------------
  39
  40    function Get_Line return Unbounded_String is
  41       Buffer : String (1 .. 1000);
  42       Last   : Natural;
  43       Str1   : String_Access;
  44       Str2   : String_Access;
  45       Result : Unbounded_String;
  46
  47    begin
  48       Get_Line (Buffer, Last);
  49       Str1 := new String'(Buffer (1 .. Last));
  50       while Last = Buffer'Last loop
  51          Get_Line (Buffer, Last);
  52          Str2 := new 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 (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 (1 .. Str1'Last + Last);
  77          Str2 (Str1'Range) := Str1.all;
  78          Str2 (Str1'Last + 1 .. Str2'Last) := Buffer (1 .. Last);
  79          Free (Str1);
  80          Str1 := Str2;
  81       end loop;
  82
  83       Result.Reference := Str1;
  84       Result.Last      := Str1'Length;
  85       return Result;
  86    end Get_Line;
  87
  88    procedure Get_Line (Item : out Unbounded_String) is
  89    begin
  90       Get_Line (Current_Input, Item);
  91    end Get_Line;
  92
  93    procedure Get_Line
  94      (File : Ada.Text_IO.File_Type;
  95       Item : out Unbounded_String)
  96    is
  97    begin
  98       --  We are going to read into the string that is already there and
  99       --  allocated. Hopefully it is big enough now, if not, we will extend
 100       --  it in the usual manner using Realloc_For_Chunk.
 101
 102       --  Make sure we start with at least 80 characters
 103
 104       if Item.Reference'Last < 80 then
 105          Realloc_For_Chunk (Item, 80);
 106       end if;
 107
 108       --  Loop to read data, filling current string as far as possible.
 109       --  Item.Last holds the number of characters read so far.
 110
 111       Item.Last := 0;
 112       loop
 113          Get_Line
 114            (File,
 115             Item.Reference (Item.Last + 1 .. Item.Reference'Last),
 116             Item.Last);
 117
 118          --  If we hit the end of the line before the end of the buffer, then
 119          --  we are all done, and the result length is properly set.
 120
 121          if Item.Last < Item.Reference'Last then
 122             return;
 123          end if;
 124
 125          --  If not enough room, double it and keep reading
 126
 127          Realloc_For_Chunk (Item, Item.Last);
 128       end loop;
 129    end Get_Line;
 130
 131    ---------
 132    -- Put --
 133    ---------
 134
 135    procedure Put (U : Unbounded_String) is
 136    begin
 137       Put (U.Reference (1 .. U.Last));
 138    end Put;
 139
 140    procedure Put (File : File_Type; U : Unbounded_String) is
 141    begin
 142       Put (File, U.Reference (1 .. U.Last));
 143    end Put;
 144
 145    --------------
 146    -- Put_Line --
 147    --------------
 148
 149    procedure Put_Line (U : Unbounded_String) is
 150    begin
 151       Put_Line (U.Reference (1 .. U.Last));
 152    end Put_Line;
 153
 154    procedure Put_Line (File : File_Type; U : Unbounded_String) is
 155    begin
 156       Put_Line (File, U.Reference (1 .. U.Last));
 157    end Put_Line;
 158
 159 end Ada.Strings.Unbounded.Text_IO;