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) 1997-2021, 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
32with Ada.Text_IO; use Ada.Text_IO;
33
34package 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
159end Ada.Strings.Unbounded.Text_IO;
160