1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
|
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- O U T P U T --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2003, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 2, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
with GNAT.OS_Lib; use GNAT.OS_Lib;
package body Output is
Current_FD : File_Descriptor := Standout;
-- File descriptor for current output
Special_Output_Proc : Output_Proc := null;
-- Record argument to last call to Set_Special_Output. If this is
-- non-null, then we are in special output mode.
-------------------------
-- Line Buffer Control --
-------------------------
-- Note: the following buffer and column position are maintained by
-- the subprograms defined in this package, and are not normally
-- directly modified or accessed by a client. However, a client is
-- permitted to modify these values, using the knowledge that only
-- Write_Eol actually generates any output.
Buffer_Max : constant := 8192;
Buffer : String (1 .. Buffer_Max + 1);
-- Buffer used to build output line. We do line buffering because it
-- is needed for the support of the debug-generated-code option (-gnatD).
-- Historically it was first added because on VMS, line buffering is
-- needed with certain file formats. So in any case line buffering must
-- be retained for this purpose, even if other reasons disappear. Note
-- any attempt to write more output to a line than can fit in the buffer
-- will be silently ignored.
Next_Column : Pos range 1 .. Buffer'Length + 1 := 1;
-- Column about to be written.
-----------------------
-- Local_Subprograms --
-----------------------
procedure Flush_Buffer;
-- Flush buffer if non-empty and reset column counter
---------------------------
-- Cancel_Special_Output --
---------------------------
procedure Cancel_Special_Output is
begin
Special_Output_Proc := null;
end Cancel_Special_Output;
------------------
-- Flush_Buffer --
------------------
procedure Flush_Buffer is
Len : constant Natural := Natural (Next_Column - 1);
begin
if Len /= 0 then
-- If Special_Output_Proc has been set, then use it
if Special_Output_Proc /= null then
Special_Output_Proc.all (Buffer (1 .. Len));
-- If output is not set, then output to either standard output
-- or standard error.
elsif Len /= Write (Current_FD, Buffer'Address, Len) then
-- If there are errors with standard error, just quit
if Current_FD = Standerr then
OS_Exit (2);
-- Otherwise, set the output to standard error before
-- reporting a failure and quitting.
else
Current_FD := Standerr;
Next_Column := 1;
Write_Line ("fatal error: disk full");
OS_Exit (2);
end if;
end if;
-- Buffer is now empty
Next_Column := 1;
end if;
end Flush_Buffer;
------------
-- Column --
------------
function Column return Nat is
begin
return Next_Column;
end Column;
------------------------
-- Set_Special_Output --
------------------------
procedure Set_Special_Output (P : Output_Proc) is
begin
Special_Output_Proc := P;
end Set_Special_Output;
------------------------
-- Set_Standard_Error --
------------------------
procedure Set_Standard_Error is
begin
if Special_Output_Proc = null then
Flush_Buffer;
Next_Column := 1;
end if;
Current_FD := Standerr;
end Set_Standard_Error;
-------------------------
-- Set_Standard_Output --
-------------------------
procedure Set_Standard_Output is
begin
if Special_Output_Proc = null then
Flush_Buffer;
Next_Column := 1;
end if;
Current_FD := Standout;
end Set_Standard_Output;
-------
-- w --
-------
procedure w (C : Character) is
begin
Write_Char (''');
Write_Char (C);
Write_Char (''');
Write_Eol;
end w;
procedure w (S : String) is
begin
Write_Str (S);
Write_Eol;
end w;
procedure w (V : Int) is
begin
Write_Int (V);
Write_Eol;
end w;
procedure w (B : Boolean) is
begin
if B then
w ("True");
else
w ("False");
end if;
end w;
procedure w (L : String; C : Character) is
begin
Write_Str (L);
Write_Char (' ');
w (C);
end w;
procedure w (L : String; S : String) is
begin
Write_Str (L);
Write_Char (' ');
w (S);
end w;
procedure w (L : String; V : Int) is
begin
Write_Str (L);
Write_Char (' ');
w (V);
end w;
procedure w (L : String; B : Boolean) is
begin
Write_Str (L);
Write_Char (' ');
w (B);
end w;
----------------
-- Write_Char --
----------------
procedure Write_Char (C : Character) is
begin
if Next_Column = Buffer'Length then
Write_Eol;
end if;
Buffer (Natural (Next_Column)) := C;
Next_Column := Next_Column + 1;
end Write_Char;
---------------
-- Write_Eol --
---------------
procedure Write_Eol is
begin
Buffer (Natural (Next_Column)) := ASCII.LF;
Next_Column := Next_Column + 1;
Flush_Buffer;
end Write_Eol;
---------------
-- Write_Int --
---------------
procedure Write_Int (Val : Int) is
begin
if Val < 0 then
Write_Char ('-');
Write_Int (-Val);
else
if Val > 9 then
Write_Int (Val / 10);
end if;
Write_Char (Character'Val ((Val mod 10) + Character'Pos ('0')));
end if;
end Write_Int;
----------------
-- Write_Line --
----------------
procedure Write_Line (S : String) is
begin
Write_Str (S);
Write_Eol;
end Write_Line;
---------------
-- Write_Str --
---------------
procedure Write_Str (S : String) is
begin
for J in S'Range loop
Write_Char (S (J));
end loop;
end Write_Str;
end Output;
|
