1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUN-TIME COMPONENTS                         --
4--                                                                          --
5--                            S Y S T E M . I O                             --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--          Copyright (C) 1992-2018, 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
32package body System.IO is
33
34   Current_Out : File_Type := Stdout;
35   pragma Atomic (Current_Out);
36   --  Current output file (modified by Set_Output)
37
38   --------------
39   -- New_Line --
40   --------------
41
42   procedure New_Line (Spacing : Positive := 1) is
43   begin
44      for J in 1 .. Spacing loop
45         Put (ASCII.LF);
46      end loop;
47   end New_Line;
48
49   ---------
50   -- Put --
51   ---------
52
53   procedure Put (X : Integer) is
54      procedure Put_Int (X : Integer);
55      pragma Import (C, Put_Int, "put_int");
56
57      procedure Put_Int_Err (X : Integer);
58      pragma Import (C, Put_Int_Err, "put_int_stderr");
59
60   begin
61      case Current_Out is
62         when Stdout => Put_Int (X);
63         when Stderr => Put_Int_Err (X);
64      end case;
65   end Put;
66
67   procedure Put (C : Character) is
68      procedure Put_Char (C : Character);
69      pragma Import (C, Put_Char, "put_char");
70
71      procedure Put_Char_Stderr (C : Character);
72      pragma Import (C, Put_Char_Stderr, "put_char_stderr");
73
74   begin
75      case Current_Out is
76         when Stdout => Put_Char (C);
77         when Stderr => Put_Char_Stderr (C);
78      end case;
79   end Put;
80
81   procedure Put (S : String) is
82   begin
83      for J in S'Range loop
84         Put (S (J));
85      end loop;
86   end Put;
87
88   --------------
89   -- Put_Line --
90   --------------
91
92   procedure Put_Line (S : String) is
93   begin
94      Put (S);
95      New_Line;
96   end Put_Line;
97
98   ---------------------
99   -- Standard_Output --
100   ---------------------
101
102   function Standard_Output return File_Type is
103   begin
104      return Stdout;
105   end Standard_Output;
106
107   --------------------
108   -- Standard_Error --
109   --------------------
110
111   function Standard_Error return File_Type is
112   begin
113      return Stderr;
114   end Standard_Error;
115
116   ----------------
117   -- Set_Output --
118   ----------------
119
120   procedure Set_Output (File : File_Type) is
121   begin
122      Current_Out := File;
123   end Set_Output;
124
125end System.IO;
126