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1 706 jeremybenn
------------------------------------------------------------------------------
2
--                                                                          --
3
--                         GNAT RUN-TIME COMPONENTS                         --
4
--                                                                          --
5
--                          A D A . T E X T _ I O                           --
6
--                                                                          --
7
--                                 B o d y                                  --
8
--                                                                          --
9
--          Copyright (C) 1992-2012, 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.Streams;             use Ada.Streams;
33
with Interfaces.C_Streams;    use Interfaces.C_Streams;
34
 
35
with System.File_IO;
36
with System.CRTL;
37
with System.WCh_Cnv;          use System.WCh_Cnv;
38
with System.WCh_Con;          use System.WCh_Con;
39
 
40
with Ada.Unchecked_Conversion;
41
with Ada.Unchecked_Deallocation;
42
 
43
pragma Elaborate_All (System.File_IO);
44
--  Needed because of calls to Chain_File in package body elaboration
45
 
46
package body Ada.Text_IO is
47
 
48
   package FIO renames System.File_IO;
49
 
50
   subtype AP is FCB.AFCB_Ptr;
51
 
52
   function To_FCB is new Ada.Unchecked_Conversion (File_Mode, FCB.File_Mode);
53
   function To_TIO is new Ada.Unchecked_Conversion (FCB.File_Mode, File_Mode);
54
   use type FCB.File_Mode;
55
 
56
   use type System.CRTL.size_t;
57
 
58
   WC_Encoding : Character;
59
   pragma Import (C, WC_Encoding, "__gl_wc_encoding");
60
   --  Default wide character encoding
61
 
62
   Err_Name : aliased String := "*stderr" & ASCII.NUL;
63
   In_Name  : aliased String := "*stdin" & ASCII.NUL;
64
   Out_Name : aliased String := "*stdout" & ASCII.NUL;
65
   --  Names of standard files
66
   --
67
   --  Use "preallocated" strings to avoid calling "new" during the elaboration
68
   --  of the run time. This is needed in the tasking case to avoid calling
69
   --  Task_Lock too early. A filename is expected to end with a null character
70
   --  in the runtime, here the null characters are added just to have a
71
   --  correct filename length.
72
   --
73
   --  Note: the names for these files are bogus, and probably it would be
74
   --  better for these files to have no names, but the ACVC tests insist!
75
   --  We use names that are bound to fail in open etc.
76
 
77
   Null_Str : aliased constant String := "";
78
   --  Used as form string for standard files
79
 
80
   -----------------------
81
   -- Local Subprograms --
82
   -----------------------
83
 
84
   function Get_Upper_Half_Char
85
     (C    : Character;
86
      File : File_Type) return Character;
87
   --  This function is shared by Get and Get_Immediate to extract an encoded
88
   --  upper half character value from the given File. The first byte has
89
   --  already been read and is passed in C. The character value is returned as
90
   --  the result, and the file pointer is bumped past the character.
91
   --  Constraint_Error is raised if the encoded value is outside the bounds of
92
   --  type Character.
93
 
94
   function Get_Upper_Half_Char_Immed
95
     (C    : Character;
96
      File : File_Type) return Character;
97
   --  This routine is identical to Get_Upper_Half_Char, except that the reads
98
   --  are done in Get_Immediate mode (i.e. without waiting for a line return).
99
 
100
   function Getc (File : File_Type) return int;
101
   --  Gets next character from file, which has already been checked for being
102
   --  in read status, and returns the character read if no error occurs. The
103
   --  result is EOF if the end of file was read.
104
 
105
   function Getc_Immed (File : File_Type) return int;
106
   --  This routine is identical to Getc, except that the read is done in
107
   --  Get_Immediate mode (i.e. without waiting for a line return).
108
 
109
   function Has_Upper_Half_Character (Item : String) return Boolean;
110
   --  Returns True if any of the characters is in the range 16#80#-16#FF#
111
 
112
   function Nextc (File : File_Type) return int;
113
   --  Returns next character from file without skipping past it (i.e. it is a
114
   --  combination of Getc followed by an Ungetc).
115
 
116
   procedure Put_Encoded (File : File_Type; Char : Character);
117
   --  Called to output a character Char to the given File, when the encoding
118
   --  method for the file is other than brackets, and Char is upper half.
119
 
120
   procedure Putc (ch : int; File : File_Type);
121
   --  Outputs the given character to the file, which has already been checked
122
   --  for being in output status. Device_Error is raised if the character
123
   --  cannot be written.
124
 
125
   procedure Set_WCEM (File : in out File_Type);
126
   --  Called by Open and Create to set the wide character encoding method for
127
   --  the file, processing a WCEM form parameter if one is present. File is
128
   --  IN OUT because it may be closed in case of an error.
129
 
130
   procedure Terminate_Line (File : File_Type);
131
   --  If the file is in Write_File or Append_File mode, and the current line
132
   --  is not terminated, then a line terminator is written using New_Line.
133
   --  Note that there is no Terminate_Page routine, because the page mark at
134
   --  the end of the file is implied if necessary.
135
 
136
   procedure Ungetc (ch : int; File : File_Type);
137
   --  Pushes back character into stream, using ungetc. The caller has checked
138
   --  that the file is in read status. Device_Error is raised if the character
139
   --  cannot be pushed back. An attempt to push back and end of file character
140
   --  (EOF) is ignored.
141
 
142
   -------------------
143
   -- AFCB_Allocate --
144
   -------------------
145
 
146
   function AFCB_Allocate (Control_Block : Text_AFCB) return FCB.AFCB_Ptr is
147
      pragma Unreferenced (Control_Block);
148
   begin
149
      return new Text_AFCB;
150
   end AFCB_Allocate;
151
 
152
   ----------------
153
   -- AFCB_Close --
154
   ----------------
155
 
156
   procedure AFCB_Close (File : not null access Text_AFCB) is
157
   begin
158
      --  If the file being closed is one of the current files, then close
159
      --  the corresponding current file. It is not clear that this action
160
      --  is required (RM A.10.3(23)) but it seems reasonable, and besides
161
      --  ACVC test CE3208A expects this behavior.
162
 
163
      if File_Type (File) = Current_In then
164
         Current_In := null;
165
      elsif File_Type (File) = Current_Out then
166
         Current_Out := null;
167
      elsif File_Type (File) = Current_Err then
168
         Current_Err := null;
169
      end if;
170
 
171
      Terminate_Line (File_Type (File));
172
   end AFCB_Close;
173
 
174
   ---------------
175
   -- AFCB_Free --
176
   ---------------
177
 
178
   procedure AFCB_Free (File : not null access Text_AFCB) is
179
      type FCB_Ptr is access all Text_AFCB;
180
      FT : FCB_Ptr := FCB_Ptr (File);
181
 
182
      procedure Free is new Ada.Unchecked_Deallocation (Text_AFCB, FCB_Ptr);
183
 
184
   begin
185
      Free (FT);
186
   end AFCB_Free;
187
 
188
   -----------
189
   -- Close --
190
   -----------
191
 
192
   procedure Close (File : in out File_Type) is
193
   begin
194
      FIO.Close (AP (File)'Unrestricted_Access);
195
   end Close;
196
 
197
   ---------
198
   -- Col --
199
   ---------
200
 
201
   --  Note: we assume that it is impossible in practice for the column
202
   --  to exceed the value of Count'Last, i.e. no check is required for
203
   --  overflow raising layout error.
204
 
205
   function Col (File : File_Type) return Positive_Count is
206
   begin
207
      FIO.Check_File_Open (AP (File));
208
      return File.Col;
209
   end Col;
210
 
211
   function Col return Positive_Count is
212
   begin
213
      return Col (Current_Out);
214
   end Col;
215
 
216
   ------------
217
   -- Create --
218
   ------------
219
 
220
   procedure Create
221
     (File : in out File_Type;
222
      Mode : File_Mode := Out_File;
223
      Name : String := "";
224
      Form : String := "")
225
   is
226
      Dummy_File_Control_Block : Text_AFCB;
227
      pragma Warnings (Off, Dummy_File_Control_Block);
228
      --  Yes, we know this is never assigned a value, only the tag
229
      --  is used for dispatching purposes, so that's expected.
230
 
231
   begin
232
      FIO.Open (File_Ptr  => AP (File),
233
                Dummy_FCB => Dummy_File_Control_Block,
234
                Mode      => To_FCB (Mode),
235
                Name      => Name,
236
                Form      => Form,
237
                Amethod   => 'T',
238
                Creat     => True,
239
                Text      => True);
240
 
241
      File.Self := File;
242
      Set_WCEM (File);
243
   end Create;
244
 
245
   -------------------
246
   -- Current_Error --
247
   -------------------
248
 
249
   function Current_Error return File_Type is
250
   begin
251
      return Current_Err;
252
   end Current_Error;
253
 
254
   function Current_Error return File_Access is
255
   begin
256
      return Current_Err.Self'Access;
257
   end Current_Error;
258
 
259
   -------------------
260
   -- Current_Input --
261
   -------------------
262
 
263
   function Current_Input return File_Type is
264
   begin
265
      return Current_In;
266
   end Current_Input;
267
 
268
   function Current_Input return File_Access is
269
   begin
270
      return Current_In.Self'Access;
271
   end Current_Input;
272
 
273
   --------------------
274
   -- Current_Output --
275
   --------------------
276
 
277
   function Current_Output return File_Type is
278
   begin
279
      return Current_Out;
280
   end Current_Output;
281
 
282
   function Current_Output return File_Access is
283
   begin
284
      return Current_Out.Self'Access;
285
   end Current_Output;
286
 
287
   ------------
288
   -- Delete --
289
   ------------
290
 
291
   procedure Delete (File : in out File_Type) is
292
   begin
293
      FIO.Delete (AP (File)'Unrestricted_Access);
294
   end Delete;
295
 
296
   -----------------
297
   -- End_Of_File --
298
   -----------------
299
 
300
   function End_Of_File (File : File_Type) return Boolean is
301
      ch : int;
302
 
303
   begin
304
      FIO.Check_Read_Status (AP (File));
305
 
306
      if File.Before_Upper_Half_Character then
307
         return False;
308
 
309
      elsif File.Before_LM then
310
         if File.Before_LM_PM then
311
            return Nextc (File) = EOF;
312
         end if;
313
 
314
      else
315
         ch := Getc (File);
316
 
317
         if ch = EOF then
318
            return True;
319
 
320
         elsif ch /= LM then
321
            Ungetc (ch, File);
322
            return False;
323
 
324
         else -- ch = LM
325
            File.Before_LM := True;
326
         end if;
327
      end if;
328
 
329
      --  Here we are just past the line mark with Before_LM set so that we
330
      --  do not have to try to back up past the LM, thus avoiding the need
331
      --  to back up more than one character.
332
 
333
      ch := Getc (File);
334
 
335
      if ch = EOF then
336
         return True;
337
 
338
      elsif ch = PM and then File.Is_Regular_File then
339
         File.Before_LM_PM := True;
340
         return Nextc (File) = EOF;
341
 
342
      --  Here if neither EOF nor PM followed end of line
343
 
344
      else
345
         Ungetc (ch, File);
346
         return False;
347
      end if;
348
 
349
   end End_Of_File;
350
 
351
   function End_Of_File return Boolean is
352
   begin
353
      return End_Of_File (Current_In);
354
   end End_Of_File;
355
 
356
   -----------------
357
   -- End_Of_Line --
358
   -----------------
359
 
360
   function End_Of_Line (File : File_Type) return Boolean is
361
      ch : int;
362
 
363
   begin
364
      FIO.Check_Read_Status (AP (File));
365
 
366
      if File.Before_Upper_Half_Character then
367
         return False;
368
 
369
      elsif File.Before_LM then
370
         return True;
371
 
372
      else
373
         ch := Getc (File);
374
 
375
         if ch = EOF then
376
            return True;
377
 
378
         else
379
            Ungetc (ch, File);
380
            return (ch = LM);
381
         end if;
382
      end if;
383
   end End_Of_Line;
384
 
385
   function End_Of_Line return Boolean is
386
   begin
387
      return End_Of_Line (Current_In);
388
   end End_Of_Line;
389
 
390
   -----------------
391
   -- End_Of_Page --
392
   -----------------
393
 
394
   function End_Of_Page (File : File_Type) return Boolean is
395
      ch  : int;
396
 
397
   begin
398
      FIO.Check_Read_Status (AP (File));
399
 
400
      if not File.Is_Regular_File then
401
         return False;
402
 
403
      elsif File.Before_Upper_Half_Character then
404
         return False;
405
 
406
      elsif File.Before_LM then
407
         if File.Before_LM_PM then
408
            return True;
409
         end if;
410
 
411
      else
412
         ch := Getc (File);
413
 
414
         if ch = EOF then
415
            return True;
416
 
417
         elsif ch /= LM then
418
            Ungetc (ch, File);
419
            return False;
420
 
421
         else -- ch = LM
422
            File.Before_LM := True;
423
         end if;
424
      end if;
425
 
426
      --  Here we are just past the line mark with Before_LM set so that we
427
      --  do not have to try to back up past the LM, thus avoiding the need
428
      --  to back up more than one character.
429
 
430
      ch := Nextc (File);
431
 
432
      return ch = PM or else ch = EOF;
433
   end End_Of_Page;
434
 
435
   function End_Of_Page return Boolean is
436
   begin
437
      return End_Of_Page (Current_In);
438
   end End_Of_Page;
439
 
440
   --------------
441
   -- EOF_Char --
442
   --------------
443
 
444
   function EOF_Char return Integer is
445
   begin
446
      return EOF;
447
   end EOF_Char;
448
 
449
   -----------
450
   -- Flush --
451
   -----------
452
 
453
   procedure Flush (File : File_Type) is
454
   begin
455
      FIO.Flush (AP (File));
456
   end Flush;
457
 
458
   procedure Flush is
459
   begin
460
      Flush (Current_Out);
461
   end Flush;
462
 
463
   ----------
464
   -- Form --
465
   ----------
466
 
467
   function Form (File : File_Type) return String is
468
   begin
469
      return FIO.Form (AP (File));
470
   end Form;
471
 
472
   ---------
473
   -- Get --
474
   ---------
475
 
476
   procedure Get
477
     (File : File_Type;
478
      Item : out Character)
479
   is
480
      ch : int;
481
 
482
   begin
483
      FIO.Check_Read_Status (AP (File));
484
 
485
      if File.Before_Upper_Half_Character then
486
         File.Before_Upper_Half_Character := False;
487
         Item := File.Saved_Upper_Half_Character;
488
 
489
      elsif File.Before_LM then
490
         File.Before_LM := False;
491
         File.Col := 1;
492
 
493
         if File.Before_LM_PM then
494
            File.Line := 1;
495
            File.Page := File.Page + 1;
496
            File.Before_LM_PM := False;
497
         else
498
            File.Line := File.Line + 1;
499
         end if;
500
      end if;
501
 
502
      loop
503
         ch := Getc (File);
504
 
505
         if ch = EOF then
506
            raise End_Error;
507
 
508
         elsif ch = LM then
509
            File.Line := File.Line + 1;
510
            File.Col := 1;
511
 
512
         elsif ch = PM and then File.Is_Regular_File then
513
            File.Page := File.Page + 1;
514
            File.Line := 1;
515
 
516
         else
517
            Item := Character'Val (ch);
518
            File.Col := File.Col + 1;
519
            return;
520
         end if;
521
      end loop;
522
   end Get;
523
 
524
   procedure Get (Item : out Character) is
525
   begin
526
      Get (Current_In, Item);
527
   end Get;
528
 
529
   procedure Get
530
     (File : File_Type;
531
      Item : out String)
532
   is
533
      ch : int;
534
      J  : Natural;
535
 
536
   begin
537
      FIO.Check_Read_Status (AP (File));
538
 
539
      if File.Before_LM then
540
         File.Before_LM := False;
541
         File.Before_LM_PM := False;
542
         File.Col := 1;
543
 
544
         if File.Before_LM_PM then
545
            File.Line := 1;
546
            File.Page := File.Page + 1;
547
            File.Before_LM_PM := False;
548
 
549
         else
550
            File.Line := File.Line + 1;
551
         end if;
552
      end if;
553
 
554
      J := Item'First;
555
      while J <= Item'Last loop
556
         ch := Getc (File);
557
 
558
         if ch = EOF then
559
            raise End_Error;
560
 
561
         elsif ch = LM then
562
            File.Line := File.Line + 1;
563
            File.Col := 1;
564
 
565
         elsif ch = PM and then File.Is_Regular_File then
566
            File.Page := File.Page + 1;
567
            File.Line := 1;
568
 
569
         else
570
            Item (J) := Character'Val (ch);
571
            J := J + 1;
572
            File.Col := File.Col + 1;
573
         end if;
574
      end loop;
575
   end Get;
576
 
577
   procedure Get (Item : out String) is
578
   begin
579
      Get (Current_In, Item);
580
   end Get;
581
 
582
   -------------------
583
   -- Get_Immediate --
584
   -------------------
585
 
586
   procedure Get_Immediate
587
     (File : File_Type;
588
      Item : out Character)
589
   is
590
      ch          : int;
591
 
592
   begin
593
      FIO.Check_Read_Status (AP (File));
594
 
595
      if File.Before_Upper_Half_Character then
596
         File.Before_Upper_Half_Character := False;
597
         Item := File.Saved_Upper_Half_Character;
598
 
599
      elsif File.Before_LM then
600
         File.Before_LM := False;
601
         File.Before_LM_PM := False;
602
         Item := Character'Val (LM);
603
 
604
      else
605
         ch := Getc_Immed (File);
606
 
607
         if ch = EOF then
608
            raise End_Error;
609
         else
610
            Item :=
611
              (if not Is_Start_Of_Encoding (Character'Val (ch), File.WC_Method)
612
               then Character'Val (ch)
613
               else Get_Upper_Half_Char_Immed (Character'Val (ch), File));
614
         end if;
615
      end if;
616
   end Get_Immediate;
617
 
618
   procedure Get_Immediate
619
     (Item : out Character)
620
   is
621
   begin
622
      Get_Immediate (Current_In, Item);
623
   end Get_Immediate;
624
 
625
   procedure Get_Immediate
626
     (File      : File_Type;
627
      Item      : out Character;
628
      Available : out Boolean)
629
   is
630
      ch          : int;
631
      end_of_file : int;
632
      avail       : int;
633
 
634
      procedure getc_immediate_nowait
635
        (stream      : FILEs;
636
         ch          : out int;
637
         end_of_file : out int;
638
         avail       : out int);
639
      pragma Import (C, getc_immediate_nowait, "getc_immediate_nowait");
640
 
641
   begin
642
      FIO.Check_Read_Status (AP (File));
643
      Available := True;
644
 
645
      if File.Before_Upper_Half_Character then
646
         File.Before_Upper_Half_Character := False;
647
         Item := File.Saved_Upper_Half_Character;
648
 
649
      elsif File.Before_LM then
650
         File.Before_LM := False;
651
         File.Before_LM_PM := False;
652
         Item := Character'Val (LM);
653
 
654
      else
655
         getc_immediate_nowait (File.Stream, ch, end_of_file, avail);
656
 
657
         if ferror (File.Stream) /= 0 then
658
            raise Device_Error;
659
 
660
         elsif end_of_file /= 0 then
661
            raise End_Error;
662
 
663
         elsif avail = 0 then
664
            Available := False;
665
            Item := ASCII.NUL;
666
 
667
         else
668
            Available := True;
669
 
670
            Item :=
671
              (if Is_Start_Of_Encoding (Character'Val (ch), File.WC_Method)
672
               then Character'Val (ch)
673
               else Get_Upper_Half_Char_Immed (Character'Val (ch), File));
674
         end if;
675
      end if;
676
 
677
   end Get_Immediate;
678
 
679
   procedure Get_Immediate
680
     (Item      : out Character;
681
      Available : out Boolean)
682
   is
683
   begin
684
      Get_Immediate (Current_In, Item, Available);
685
   end Get_Immediate;
686
 
687
   --------------
688
   -- Get_Line --
689
   --------------
690
 
691
   procedure Get_Line
692
     (File : File_Type;
693
      Item : out String;
694
      Last : out Natural) is separate;
695
   --  The implementation of Ada.Text_IO.Get_Line is split into a subunit so
696
   --  that different implementations can be used on different systems. In
697
   --  particular the standard implementation uses low level stuff that is
698
   --  not appropriate for the JVM and .NET implementations.
699
 
700
   procedure Get_Line
701
     (Item : out String;
702
      Last : out Natural)
703
   is
704
   begin
705
      Get_Line (Current_In, Item, Last);
706
   end Get_Line;
707
 
708
   function Get_Line (File : File_Type) return String is
709
      Buffer : String (1 .. 500);
710
      Last   : Natural;
711
 
712
      function Get_Rest (S : String) return String;
713
      --  This is a recursive function that reads the rest of the line and
714
      --  returns it. S is the part read so far.
715
 
716
      --------------
717
      -- Get_Rest --
718
      --------------
719
 
720
      function Get_Rest (S : String) return String is
721
 
722
         --  Each time we allocate a buffer the same size as what we have
723
         --  read so far. This limits us to a logarithmic number of calls
724
         --  to Get_Rest and also ensures only a linear use of stack space.
725
 
726
         Buffer : String (1 .. S'Length);
727
         Last   : Natural;
728
 
729
      begin
730
         Get_Line (File, Buffer, Last);
731
 
732
         declare
733
            R : constant String := S & Buffer (1 .. Last);
734
         begin
735
            if Last < Buffer'Last then
736
               return R;
737
            else
738
               return Get_Rest (R);
739
            end if;
740
         end;
741
      end Get_Rest;
742
 
743
   --  Start of processing for Get_Line
744
 
745
   begin
746
      Get_Line (File, Buffer, Last);
747
 
748
      if Last < Buffer'Last then
749
         return Buffer (1 .. Last);
750
      else
751
         return Get_Rest (Buffer (1 .. Last));
752
      end if;
753
   end Get_Line;
754
 
755
   function Get_Line return String is
756
   begin
757
      return Get_Line (Current_In);
758
   end Get_Line;
759
 
760
   -------------------------
761
   -- Get_Upper_Half_Char --
762
   -------------------------
763
 
764
   function Get_Upper_Half_Char
765
     (C    : Character;
766
      File : File_Type) return Character
767
   is
768
      Result : Wide_Character;
769
 
770
      function In_Char return Character;
771
      --  Function used to obtain additional characters it the wide character
772
      --  sequence is more than one character long.
773
 
774
      function WC_In is new Char_Sequence_To_Wide_Char (In_Char);
775
 
776
      -------------
777
      -- In_Char --
778
      -------------
779
 
780
      function In_Char return Character is
781
         ch : constant Integer := Getc (File);
782
      begin
783
         if ch = EOF then
784
            raise End_Error;
785
         else
786
            return Character'Val (ch);
787
         end if;
788
      end In_Char;
789
 
790
   --  Start of processing for Get_Upper_Half_Char
791
 
792
   begin
793
      Result := WC_In (C, File.WC_Method);
794
 
795
      if Wide_Character'Pos (Result) > 16#FF# then
796
         raise Constraint_Error with
797
           "invalid wide character in Text_'I'O input";
798
      else
799
         return Character'Val (Wide_Character'Pos (Result));
800
      end if;
801
   end Get_Upper_Half_Char;
802
 
803
   -------------------------------
804
   -- Get_Upper_Half_Char_Immed --
805
   -------------------------------
806
 
807
   function Get_Upper_Half_Char_Immed
808
     (C    : Character;
809
      File : File_Type) return Character
810
   is
811
      Result : Wide_Character;
812
 
813
      function In_Char return Character;
814
      --  Function used to obtain additional characters it the wide character
815
      --  sequence is more than one character long.
816
 
817
      function WC_In is new Char_Sequence_To_Wide_Char (In_Char);
818
 
819
      -------------
820
      -- In_Char --
821
      -------------
822
 
823
      function In_Char return Character is
824
         ch : constant Integer := Getc_Immed (File);
825
      begin
826
         if ch = EOF then
827
            raise End_Error;
828
         else
829
            return Character'Val (ch);
830
         end if;
831
      end In_Char;
832
 
833
   --  Start of processing for Get_Upper_Half_Char_Immed
834
 
835
   begin
836
      Result := WC_In (C, File.WC_Method);
837
 
838
      if Wide_Character'Pos (Result) > 16#FF# then
839
         raise Constraint_Error with
840
           "invalid wide character in Text_'I'O input";
841
      else
842
         return Character'Val (Wide_Character'Pos (Result));
843
      end if;
844
   end Get_Upper_Half_Char_Immed;
845
 
846
   ----------
847
   -- Getc --
848
   ----------
849
 
850
   function Getc (File : File_Type) return int is
851
      ch : int;
852
 
853
   begin
854
      ch := fgetc (File.Stream);
855
 
856
      if ch = EOF and then ferror (File.Stream) /= 0 then
857
         raise Device_Error;
858
      else
859
         return ch;
860
      end if;
861
   end Getc;
862
 
863
   ----------------
864
   -- Getc_Immed --
865
   ----------------
866
 
867
   function Getc_Immed (File : File_Type) return int is
868
      ch          : int;
869
      end_of_file : int;
870
 
871
      procedure getc_immediate
872
        (stream : FILEs; ch : out int; end_of_file : out int);
873
      pragma Import (C, getc_immediate, "getc_immediate");
874
 
875
   begin
876
      FIO.Check_Read_Status (AP (File));
877
 
878
      if File.Before_LM then
879
         File.Before_LM := False;
880
         File.Before_LM_PM := False;
881
         ch := LM;
882
 
883
      else
884
         getc_immediate (File.Stream, ch, end_of_file);
885
 
886
         if ferror (File.Stream) /= 0 then
887
            raise Device_Error;
888
         elsif end_of_file /= 0 then
889
            return EOF;
890
         end if;
891
      end if;
892
 
893
      return ch;
894
   end Getc_Immed;
895
 
896
   ------------------------------
897
   -- Has_Upper_Half_Character --
898
   ------------------------------
899
 
900
   function Has_Upper_Half_Character (Item : String) return Boolean is
901
   begin
902
      for J in Item'Range loop
903
         if Character'Pos (Item (J)) >= 16#80# then
904
            return True;
905
         end if;
906
      end loop;
907
 
908
      return False;
909
   end Has_Upper_Half_Character;
910
 
911
   -------------------------------
912
   -- Initialize_Standard_Files --
913
   -------------------------------
914
 
915
   procedure Initialize_Standard_Files is
916
   begin
917
      Standard_Err.Stream            := stderr;
918
      Standard_Err.Name              := Err_Name'Access;
919
      Standard_Err.Form              := Null_Str'Unrestricted_Access;
920
      Standard_Err.Mode              := FCB.Out_File;
921
      Standard_Err.Is_Regular_File   := is_regular_file (fileno (stderr)) /= 0;
922
      Standard_Err.Is_Temporary_File := False;
923
      Standard_Err.Is_System_File    := True;
924
      Standard_Err.Is_Text_File      := True;
925
      Standard_Err.Access_Method     := 'T';
926
      Standard_Err.Self              := Standard_Err;
927
      Standard_Err.WC_Method         := Default_WCEM;
928
 
929
      Standard_In.Stream             := stdin;
930
      Standard_In.Name               := In_Name'Access;
931
      Standard_In.Form               := Null_Str'Unrestricted_Access;
932
      Standard_In.Mode               := FCB.In_File;
933
      Standard_In.Is_Regular_File    := is_regular_file (fileno (stdin)) /= 0;
934
      Standard_In.Is_Temporary_File  := False;
935
      Standard_In.Is_System_File     := True;
936
      Standard_In.Is_Text_File       := True;
937
      Standard_In.Access_Method      := 'T';
938
      Standard_In.Self               := Standard_In;
939
      Standard_In.WC_Method          := Default_WCEM;
940
 
941
      Standard_Out.Stream            := stdout;
942
      Standard_Out.Name              := Out_Name'Access;
943
      Standard_Out.Form              := Null_Str'Unrestricted_Access;
944
      Standard_Out.Mode              := FCB.Out_File;
945
      Standard_Out.Is_Regular_File   := is_regular_file (fileno (stdout)) /= 0;
946
      Standard_Out.Is_Temporary_File := False;
947
      Standard_Out.Is_System_File    := True;
948
      Standard_Out.Is_Text_File      := True;
949
      Standard_Out.Access_Method     := 'T';
950
      Standard_Out.Self              := Standard_Out;
951
      Standard_Out.WC_Method         := Default_WCEM;
952
 
953
      FIO.Make_Unbuffered (AP (Standard_Out));
954
      FIO.Make_Unbuffered (AP (Standard_Err));
955
   end Initialize_Standard_Files;
956
 
957
   -------------
958
   -- Is_Open --
959
   -------------
960
 
961
   function Is_Open (File : File_Type) return Boolean is
962
   begin
963
      return FIO.Is_Open (AP (File));
964
   end Is_Open;
965
 
966
   ----------
967
   -- Line --
968
   ----------
969
 
970
   --  Note: we assume that it is impossible in practice for the line
971
   --  to exceed the value of Count'Last, i.e. no check is required for
972
   --  overflow raising layout error.
973
 
974
   function Line (File : File_Type) return Positive_Count is
975
   begin
976
      FIO.Check_File_Open (AP (File));
977
      return File.Line;
978
   end Line;
979
 
980
   function Line return Positive_Count is
981
   begin
982
      return Line (Current_Out);
983
   end Line;
984
 
985
   -----------------
986
   -- Line_Length --
987
   -----------------
988
 
989
   function Line_Length (File : File_Type) return Count is
990
   begin
991
      FIO.Check_Write_Status (AP (File));
992
      return File.Line_Length;
993
   end Line_Length;
994
 
995
   function Line_Length return Count is
996
   begin
997
      return Line_Length (Current_Out);
998
   end Line_Length;
999
 
1000
   ----------------
1001
   -- Look_Ahead --
1002
   ----------------
1003
 
1004
   procedure Look_Ahead
1005
     (File        : File_Type;
1006
      Item        : out Character;
1007
      End_Of_Line : out Boolean)
1008
   is
1009
      ch : int;
1010
 
1011
   begin
1012
      FIO.Check_Read_Status (AP (File));
1013
 
1014
      --  If we are logically before a line mark, we can return immediately
1015
 
1016
      if File.Before_LM then
1017
         End_Of_Line := True;
1018
         Item := ASCII.NUL;
1019
 
1020
      --  If we are before an upper half character just return it (this can
1021
      --  happen if there are two calls to Look_Ahead in a row).
1022
 
1023
      elsif File.Before_Upper_Half_Character then
1024
         End_Of_Line := False;
1025
         Item := File.Saved_Upper_Half_Character;
1026
 
1027
      --  Otherwise we must read a character from the input stream
1028
 
1029
      else
1030
         ch := Getc (File);
1031
 
1032
         if ch = LM
1033
           or else ch = EOF
1034
           or else (ch = PM and then File.Is_Regular_File)
1035
         then
1036
            End_Of_Line := True;
1037
            Ungetc (ch, File);
1038
            Item := ASCII.NUL;
1039
 
1040
         --  Case where character obtained does not represent the start of an
1041
         --  encoded sequence so it stands for itself and we can unget it with
1042
         --  no difficulty.
1043
 
1044
         elsif not Is_Start_Of_Encoding
1045
                     (Character'Val (ch), File.WC_Method)
1046
         then
1047
            End_Of_Line := False;
1048
            Ungetc (ch, File);
1049
            Item := Character'Val (ch);
1050
 
1051
         --  For the start of an encoding, we read the character using the
1052
         --  Get_Upper_Half_Char routine. It will occupy more than one byte
1053
         --  so we can't put it back with ungetc. Instead we save it in the
1054
         --  control block, setting a flag that everyone interested in reading
1055
         --  characters must test before reading the stream.
1056
 
1057
         else
1058
            Item := Get_Upper_Half_Char (Character'Val (ch), File);
1059
            End_Of_Line := False;
1060
            File.Saved_Upper_Half_Character := Item;
1061
            File.Before_Upper_Half_Character := True;
1062
         end if;
1063
      end if;
1064
   end Look_Ahead;
1065
 
1066
   procedure Look_Ahead
1067
     (Item        : out Character;
1068
      End_Of_Line : out Boolean)
1069
   is
1070
   begin
1071
      Look_Ahead (Current_In, Item, End_Of_Line);
1072
   end Look_Ahead;
1073
 
1074
   ----------
1075
   -- Mode --
1076
   ----------
1077
 
1078
   function Mode (File : File_Type) return File_Mode is
1079
   begin
1080
      return To_TIO (FIO.Mode (AP (File)));
1081
   end Mode;
1082
 
1083
   ----------
1084
   -- Name --
1085
   ----------
1086
 
1087
   function Name (File : File_Type) return String is
1088
   begin
1089
      return FIO.Name (AP (File));
1090
   end Name;
1091
 
1092
   --------------
1093
   -- New_Line --
1094
   --------------
1095
 
1096
   procedure New_Line
1097
     (File    : File_Type;
1098
      Spacing : Positive_Count := 1)
1099
   is
1100
   begin
1101
      --  Raise Constraint_Error if out of range value. The reason for this
1102
      --  explicit test is that we don't want junk values around, even if
1103
      --  checks are off in the caller.
1104
 
1105
      if not Spacing'Valid then
1106
         raise Constraint_Error;
1107
      end if;
1108
 
1109
      FIO.Check_Write_Status (AP (File));
1110
 
1111
      for K in 1 .. Spacing loop
1112
         Putc (LM, File);
1113
         File.Line := File.Line + 1;
1114
 
1115
         if File.Page_Length /= 0
1116
           and then File.Line > File.Page_Length
1117
         then
1118
            Putc (PM, File);
1119
            File.Line := 1;
1120
            File.Page := File.Page + 1;
1121
         end if;
1122
      end loop;
1123
 
1124
      File.Col := 1;
1125
   end New_Line;
1126
 
1127
   procedure New_Line (Spacing : Positive_Count := 1) is
1128
   begin
1129
      New_Line (Current_Out, Spacing);
1130
   end New_Line;
1131
 
1132
   --------------
1133
   -- New_Page --
1134
   --------------
1135
 
1136
   procedure New_Page (File : File_Type) is
1137
   begin
1138
      FIO.Check_Write_Status (AP (File));
1139
 
1140
      if File.Col /= 1 or else File.Line = 1 then
1141
         Putc (LM, File);
1142
      end if;
1143
 
1144
      Putc (PM, File);
1145
      File.Page := File.Page + 1;
1146
      File.Line := 1;
1147
      File.Col := 1;
1148
   end New_Page;
1149
 
1150
   procedure New_Page is
1151
   begin
1152
      New_Page (Current_Out);
1153
   end New_Page;
1154
 
1155
   -----------
1156
   -- Nextc --
1157
   -----------
1158
 
1159
   function Nextc (File : File_Type) return int is
1160
      ch : int;
1161
 
1162
   begin
1163
      ch := fgetc (File.Stream);
1164
 
1165
      if ch = EOF then
1166
         if ferror (File.Stream) /= 0 then
1167
            raise Device_Error;
1168
         end if;
1169
 
1170
      else
1171
         if ungetc (ch, File.Stream) = EOF then
1172
            raise Device_Error;
1173
         end if;
1174
      end if;
1175
 
1176
      return ch;
1177
   end Nextc;
1178
 
1179
   ----------
1180
   -- Open --
1181
   ----------
1182
 
1183
   procedure Open
1184
     (File : in out File_Type;
1185
      Mode : File_Mode;
1186
      Name : String;
1187
      Form : String := "")
1188
   is
1189
      Dummy_File_Control_Block : Text_AFCB;
1190
      pragma Warnings (Off, Dummy_File_Control_Block);
1191
      --  Yes, we know this is never assigned a value, only the tag
1192
      --  is used for dispatching purposes, so that's expected.
1193
 
1194
   begin
1195
      FIO.Open (File_Ptr  => AP (File),
1196
                Dummy_FCB => Dummy_File_Control_Block,
1197
                Mode      => To_FCB (Mode),
1198
                Name      => Name,
1199
                Form      => Form,
1200
                Amethod   => 'T',
1201
                Creat     => False,
1202
                Text      => True);
1203
 
1204
      File.Self := File;
1205
      Set_WCEM (File);
1206
   end Open;
1207
 
1208
   ----------
1209
   -- Page --
1210
   ----------
1211
 
1212
   --  Note: we assume that it is impossible in practice for the page
1213
   --  to exceed the value of Count'Last, i.e. no check is required for
1214
   --  overflow raising layout error.
1215
 
1216
   function Page (File : File_Type) return Positive_Count is
1217
   begin
1218
      FIO.Check_File_Open (AP (File));
1219
      return File.Page;
1220
   end Page;
1221
 
1222
   function Page return Positive_Count is
1223
   begin
1224
      return Page (Current_Out);
1225
   end Page;
1226
 
1227
   -----------------
1228
   -- Page_Length --
1229
   -----------------
1230
 
1231
   function Page_Length (File : File_Type) return Count is
1232
   begin
1233
      FIO.Check_Write_Status (AP (File));
1234
      return File.Page_Length;
1235
   end Page_Length;
1236
 
1237
   function Page_Length return Count is
1238
   begin
1239
      return Page_Length (Current_Out);
1240
   end Page_Length;
1241
 
1242
   ---------
1243
   -- Put --
1244
   ---------
1245
 
1246
   procedure Put
1247
     (File : File_Type;
1248
      Item : Character)
1249
   is
1250
   begin
1251
      FIO.Check_Write_Status (AP (File));
1252
 
1253
      if File.Line_Length /= 0 and then File.Col > File.Line_Length then
1254
         New_Line (File);
1255
      end if;
1256
 
1257
      --  If lower half character, or brackets encoding, output directly
1258
 
1259
      if Character'Pos (Item) < 16#80#
1260
        or else File.WC_Method = WCEM_Brackets
1261
      then
1262
         if fputc (Character'Pos (Item), File.Stream) = EOF then
1263
            raise Device_Error;
1264
         end if;
1265
 
1266
      --  Case of upper half character with non-brackets encoding
1267
 
1268
      else
1269
         Put_Encoded (File, Item);
1270
      end if;
1271
 
1272
      File.Col := File.Col + 1;
1273
   end Put;
1274
 
1275
   procedure Put (Item : Character) is
1276
   begin
1277
      Put (Current_Out, Item);
1278
   end Put;
1279
 
1280
   ---------
1281
   -- Put --
1282
   ---------
1283
 
1284
   procedure Put
1285
     (File : File_Type;
1286
      Item : String)
1287
   is
1288
   begin
1289
      FIO.Check_Write_Status (AP (File));
1290
 
1291
      --  Only have something to do if string is non-null
1292
 
1293
      if Item'Length > 0 then
1294
 
1295
         --  If we have bounded lines, or if the file encoding is other than
1296
         --  Brackets and the string has at least one upper half character,
1297
         --  then output the string character by character.
1298
 
1299
         if File.Line_Length /= 0
1300
           or else (File.WC_Method /= WCEM_Brackets
1301
                      and then Has_Upper_Half_Character (Item))
1302
         then
1303
            for J in Item'Range loop
1304
               Put (File, Item (J));
1305
            end loop;
1306
 
1307
         --  Otherwise we can output the entire string at once. Note that if
1308
         --  there are LF or FF characters in the string, we do not bother to
1309
         --  count them as line or page terminators.
1310
 
1311
         else
1312
            FIO.Write_Buf (AP (File), Item'Address, Item'Length);
1313
            File.Col := File.Col + Item'Length;
1314
         end if;
1315
      end if;
1316
   end Put;
1317
 
1318
   procedure Put (Item : String) is
1319
   begin
1320
      Put (Current_Out, Item);
1321
   end Put;
1322
 
1323
   -----------------
1324
   -- Put_Encoded --
1325
   -----------------
1326
 
1327
   procedure Put_Encoded (File : File_Type; Char : Character) is
1328
      procedure Out_Char (C : Character);
1329
      --  Procedure to output one character of an upper half encoded sequence
1330
 
1331
      procedure WC_Out is new Wide_Char_To_Char_Sequence (Out_Char);
1332
 
1333
      --------------
1334
      -- Out_Char --
1335
      --------------
1336
 
1337
      procedure Out_Char (C : Character) is
1338
      begin
1339
         Putc (Character'Pos (C), File);
1340
      end Out_Char;
1341
 
1342
   --  Start of processing for Put_Encoded
1343
 
1344
   begin
1345
      WC_Out (Wide_Character'Val (Character'Pos (Char)), File.WC_Method);
1346
   end Put_Encoded;
1347
 
1348
   --------------
1349
   -- Put_Line --
1350
   --------------
1351
 
1352
   procedure Put_Line
1353
     (File : File_Type;
1354
      Item : String)
1355
   is
1356
      Ilen   : Natural := Item'Length;
1357
      Istart : Natural := Item'First;
1358
 
1359
   begin
1360
      FIO.Check_Write_Status (AP (File));
1361
 
1362
      --  If we have bounded lines, or if the file encoding is other than
1363
      --  Brackets and the string has at least one upper half character, then
1364
      --  output the string character by character.
1365
 
1366
      if File.Line_Length /= 0
1367
        or else (File.WC_Method /= WCEM_Brackets
1368
                   and then Has_Upper_Half_Character (Item))
1369
      then
1370
         for J in Item'Range loop
1371
            Put (File, Item (J));
1372
         end loop;
1373
 
1374
         New_Line (File);
1375
         return;
1376
      end if;
1377
 
1378
      --  Normal case where we do not need to output character by character
1379
 
1380
      --  We setup a single string that has the necessary terminators and
1381
      --  then write it with a single call. The reason for doing this is
1382
      --  that it gives better behavior for the use of Put_Line in multi-
1383
      --  tasking programs, since often the OS will treat the entire put
1384
      --  operation as an atomic operation.
1385
 
1386
      --  We only do this if the message is 512 characters or less in length,
1387
      --  since otherwise Put_Line would use an unbounded amount of stack
1388
      --  space and could cause undetected stack overflow. If we have a
1389
      --  longer string, then output the first part separately to avoid this.
1390
 
1391
      if Ilen > 512 then
1392
         FIO.Write_Buf (AP (File), Item'Address, size_t (Ilen - 512));
1393
         Istart := Istart + Ilen - 512;
1394
         Ilen   := 512;
1395
      end if;
1396
 
1397
      --  Now prepare the string with its terminator
1398
 
1399
      declare
1400
         Buffer : String (1 .. Ilen + 2);
1401
         Plen   : size_t;
1402
 
1403
      begin
1404
         Buffer (1 .. Ilen) := Item (Istart .. Item'Last);
1405
         Buffer (Ilen + 1) := Character'Val (LM);
1406
 
1407
         if File.Page_Length /= 0
1408
           and then File.Line > File.Page_Length
1409
         then
1410
            Buffer (Ilen + 2) := Character'Val (PM);
1411
            Plen := size_t (Ilen) + 2;
1412
            File.Line := 1;
1413
            File.Page := File.Page + 1;
1414
 
1415
         else
1416
            Plen := size_t (Ilen) + 1;
1417
            File.Line := File.Line + 1;
1418
         end if;
1419
 
1420
         FIO.Write_Buf (AP (File), Buffer'Address, Plen);
1421
 
1422
         File.Col := 1;
1423
      end;
1424
   end Put_Line;
1425
 
1426
   procedure Put_Line (Item : String) is
1427
   begin
1428
      Put_Line (Current_Out, Item);
1429
   end Put_Line;
1430
 
1431
   ----------
1432
   -- Putc --
1433
   ----------
1434
 
1435
   procedure Putc (ch : int; File : File_Type) is
1436
   begin
1437
      if fputc (ch, File.Stream) = EOF then
1438
         raise Device_Error;
1439
      end if;
1440
   end Putc;
1441
 
1442
   ----------
1443
   -- Read --
1444
   ----------
1445
 
1446
   --  This is the primitive Stream Read routine, used when a Text_IO file
1447
   --  is treated directly as a stream using Text_IO.Streams.Stream.
1448
 
1449
   procedure Read
1450
     (File : in out Text_AFCB;
1451
      Item : out Stream_Element_Array;
1452
      Last : out Stream_Element_Offset)
1453
   is
1454
      Discard_ch : int;
1455
      pragma Warnings (Off, Discard_ch);
1456
 
1457
   begin
1458
      --  Need to deal with Before_Upper_Half_Character ???
1459
 
1460
      if File.Mode /= FCB.In_File then
1461
         raise Mode_Error;
1462
      end if;
1463
 
1464
      --  Deal with case where our logical and physical position do not match
1465
      --  because of being after an LM or LM-PM sequence when in fact we are
1466
      --  logically positioned before it.
1467
 
1468
      if File.Before_LM then
1469
 
1470
         --  If we are before a PM, then it is possible for a stream read
1471
         --  to leave us after the LM and before the PM, which is a bit
1472
         --  odd. The easiest way to deal with this is to unget the PM,
1473
         --  so we are indeed positioned between the characters. This way
1474
         --  further stream read operations will work correctly, and the
1475
         --  effect on text processing is a little weird, but what can
1476
         --  be expected if stream and text input are mixed this way?
1477
 
1478
         if File.Before_LM_PM then
1479
            Discard_ch := ungetc (PM, File.Stream);
1480
            File.Before_LM_PM := False;
1481
         end if;
1482
 
1483
         File.Before_LM := False;
1484
 
1485
         Item (Item'First) := Stream_Element (Character'Pos (ASCII.LF));
1486
 
1487
         if Item'Length = 1 then
1488
            Last := Item'Last;
1489
 
1490
         else
1491
            Last :=
1492
              Item'First +
1493
                Stream_Element_Offset
1494
                  (fread (buffer => Item'Address,
1495
                          index  => size_t (Item'First + 1),
1496
                          size   => 1,
1497
                          count  => Item'Length - 1,
1498
                          stream => File.Stream));
1499
         end if;
1500
 
1501
         return;
1502
      end if;
1503
 
1504
      --  Now we do the read. Since this is a text file, it is normally in
1505
      --  text mode, but stream data must be read in binary mode, so we
1506
      --  temporarily set binary mode for the read, resetting it after.
1507
      --  These calls have no effect in a system (like Unix) where there is
1508
      --  no distinction between text and binary files.
1509
 
1510
      set_binary_mode (fileno (File.Stream));
1511
 
1512
      Last :=
1513
        Item'First +
1514
          Stream_Element_Offset
1515
            (fread (Item'Address, 1, Item'Length, File.Stream)) - 1;
1516
 
1517
      if Last < Item'Last then
1518
         if ferror (File.Stream) /= 0 then
1519
            raise Device_Error;
1520
         end if;
1521
      end if;
1522
 
1523
      set_text_mode (fileno (File.Stream));
1524
   end Read;
1525
 
1526
   -----------
1527
   -- Reset --
1528
   -----------
1529
 
1530
   procedure Reset
1531
     (File : in out File_Type;
1532
      Mode : File_Mode)
1533
   is
1534
   begin
1535
      --  Don't allow change of mode for current file (RM A.10.2(5))
1536
 
1537
      if (File = Current_In  or else
1538
          File = Current_Out or else
1539
          File = Current_Error)
1540
        and then To_FCB (Mode) /= File.Mode
1541
      then
1542
         raise Mode_Error;
1543
      end if;
1544
 
1545
      Terminate_Line (File);
1546
      FIO.Reset (AP (File)'Unrestricted_Access, To_FCB (Mode));
1547
      File.Page := 1;
1548
      File.Line := 1;
1549
      File.Col  := 1;
1550
      File.Line_Length := 0;
1551
      File.Page_Length := 0;
1552
      File.Before_LM := False;
1553
      File.Before_LM_PM := False;
1554
   end Reset;
1555
 
1556
   procedure Reset (File : in out File_Type) is
1557
   begin
1558
      Terminate_Line (File);
1559
      FIO.Reset (AP (File)'Unrestricted_Access);
1560
      File.Page := 1;
1561
      File.Line := 1;
1562
      File.Col  := 1;
1563
      File.Line_Length := 0;
1564
      File.Page_Length := 0;
1565
      File.Before_LM := False;
1566
      File.Before_LM_PM := False;
1567
   end Reset;
1568
 
1569
   -------------
1570
   -- Set_Col --
1571
   -------------
1572
 
1573
   procedure Set_Col
1574
     (File : File_Type;
1575
      To   : Positive_Count)
1576
   is
1577
      ch : int;
1578
 
1579
   begin
1580
      --  Raise Constraint_Error if out of range value. The reason for this
1581
      --  explicit test is that we don't want junk values around, even if
1582
      --  checks are off in the caller.
1583
 
1584
      if not To'Valid then
1585
         raise Constraint_Error;
1586
      end if;
1587
 
1588
      FIO.Check_File_Open (AP (File));
1589
 
1590
      --  Output case
1591
 
1592
      if Mode (File) >= Out_File then
1593
 
1594
         --  Error if we attempt to set Col to a value greater than the
1595
         --  maximum permissible line length.
1596
 
1597
         if File.Line_Length /= 0 and then To > File.Line_Length then
1598
            raise Layout_Error;
1599
         end if;
1600
 
1601
         --  If we are behind current position, then go to start of new line
1602
 
1603
         if To < File.Col then
1604
            New_Line (File);
1605
         end if;
1606
 
1607
         --  Loop to output blanks till we are at the required column
1608
 
1609
         while File.Col < To loop
1610
            Put (File, ' ');
1611
         end loop;
1612
 
1613
      --  Input case
1614
 
1615
      else
1616
         --  If we are logically before a LM, but physically after it, the
1617
         --  file position still reflects the position before the LM, so eat
1618
         --  it now and adjust the file position appropriately.
1619
 
1620
         if File.Before_LM then
1621
            File.Before_LM := False;
1622
            File.Before_LM_PM := False;
1623
            File.Line := File.Line + 1;
1624
            File.Col := 1;
1625
         end if;
1626
 
1627
         --  Loop reading characters till we get one at the required Col value
1628
 
1629
         loop
1630
            --  Read next character. The reason we have to read ahead is to
1631
            --  skip formatting characters, the effect of Set_Col is to set
1632
            --  us to a real character with the right Col value, and format
1633
            --  characters don't count.
1634
 
1635
            ch := Getc (File);
1636
 
1637
            --  Error if we hit an end of file
1638
 
1639
            if ch = EOF then
1640
               raise End_Error;
1641
 
1642
            --  If line mark, eat it and adjust file position
1643
 
1644
            elsif ch = LM then
1645
               File.Line := File.Line + 1;
1646
               File.Col := 1;
1647
 
1648
            --  If recognized page mark, eat it, and adjust file position
1649
 
1650
            elsif ch = PM and then File.Is_Regular_File then
1651
               File.Page := File.Page + 1;
1652
               File.Line := 1;
1653
               File.Col := 1;
1654
 
1655
            --  Otherwise this is the character we are looking for, so put it
1656
            --  back in the input stream (we have not adjusted the file
1657
            --  position yet, so everything is set right after this ungetc).
1658
 
1659
            elsif To = File.Col then
1660
               Ungetc (ch, File);
1661
               return;
1662
 
1663
            --  Keep skipping characters if we are not there yet, updating the
1664
            --  file position past the skipped character.
1665
 
1666
            else
1667
               File.Col := File.Col + 1;
1668
            end if;
1669
         end loop;
1670
      end if;
1671
   end Set_Col;
1672
 
1673
   procedure Set_Col (To : Positive_Count) is
1674
   begin
1675
      Set_Col (Current_Out, To);
1676
   end Set_Col;
1677
 
1678
   ---------------
1679
   -- Set_Error --
1680
   ---------------
1681
 
1682
   procedure Set_Error (File : File_Type) is
1683
   begin
1684
      FIO.Check_Write_Status (AP (File));
1685
      Current_Err := File;
1686
   end Set_Error;
1687
 
1688
   ---------------
1689
   -- Set_Input --
1690
   ---------------
1691
 
1692
   procedure Set_Input (File : File_Type) is
1693
   begin
1694
      FIO.Check_Read_Status (AP (File));
1695
      Current_In := File;
1696
   end Set_Input;
1697
 
1698
   --------------
1699
   -- Set_Line --
1700
   --------------
1701
 
1702
   procedure Set_Line
1703
     (File : File_Type;
1704
      To   : Positive_Count)
1705
   is
1706
   begin
1707
      --  Raise Constraint_Error if out of range value. The reason for this
1708
      --  explicit test is that we don't want junk values around, even if
1709
      --  checks are off in the caller.
1710
 
1711
      if not To'Valid then
1712
         raise Constraint_Error;
1713
      end if;
1714
 
1715
      FIO.Check_File_Open (AP (File));
1716
 
1717
      if To = File.Line then
1718
         return;
1719
      end if;
1720
 
1721
      if Mode (File) >= Out_File then
1722
         if File.Page_Length /= 0 and then To > File.Page_Length then
1723
            raise Layout_Error;
1724
         end if;
1725
 
1726
         if To < File.Line then
1727
            New_Page (File);
1728
         end if;
1729
 
1730
         while File.Line < To loop
1731
            New_Line (File);
1732
         end loop;
1733
 
1734
      else
1735
         while To /= File.Line loop
1736
            Skip_Line (File);
1737
         end loop;
1738
      end if;
1739
   end Set_Line;
1740
 
1741
   procedure Set_Line (To : Positive_Count) is
1742
   begin
1743
      Set_Line (Current_Out, To);
1744
   end Set_Line;
1745
 
1746
   ---------------------
1747
   -- Set_Line_Length --
1748
   ---------------------
1749
 
1750
   procedure Set_Line_Length (File : File_Type; To : Count) is
1751
   begin
1752
      --  Raise Constraint_Error if out of range value. The reason for this
1753
      --  explicit test is that we don't want junk values around, even if
1754
      --  checks are off in the caller.
1755
 
1756
      if not To'Valid then
1757
         raise Constraint_Error;
1758
      end if;
1759
 
1760
      FIO.Check_Write_Status (AP (File));
1761
      File.Line_Length := To;
1762
   end Set_Line_Length;
1763
 
1764
   procedure Set_Line_Length (To : Count) is
1765
   begin
1766
      Set_Line_Length (Current_Out, To);
1767
   end Set_Line_Length;
1768
 
1769
   ----------------
1770
   -- Set_Output --
1771
   ----------------
1772
 
1773
   procedure Set_Output (File : File_Type) is
1774
   begin
1775
      FIO.Check_Write_Status (AP (File));
1776
      Current_Out := File;
1777
   end Set_Output;
1778
 
1779
   ---------------------
1780
   -- Set_Page_Length --
1781
   ---------------------
1782
 
1783
   procedure Set_Page_Length (File : File_Type; To : Count) is
1784
   begin
1785
      --  Raise Constraint_Error if out of range value. The reason for this
1786
      --  explicit test is that we don't want junk values around, even if
1787
      --  checks are off in the caller.
1788
 
1789
      if not To'Valid then
1790
         raise Constraint_Error;
1791
      end if;
1792
 
1793
      FIO.Check_Write_Status (AP (File));
1794
      File.Page_Length := To;
1795
   end Set_Page_Length;
1796
 
1797
   procedure Set_Page_Length (To : Count) is
1798
   begin
1799
      Set_Page_Length (Current_Out, To);
1800
   end Set_Page_Length;
1801
 
1802
   --------------
1803
   -- Set_WCEM --
1804
   --------------
1805
 
1806
   procedure Set_WCEM (File : in out File_Type) is
1807
      Start : Natural;
1808
      Stop  : Natural;
1809
 
1810
   begin
1811
      File.WC_Method := WCEM_Brackets;
1812
      FIO.Form_Parameter (File.Form.all, "wcem", Start, Stop);
1813
 
1814
      if Start = 0 then
1815
         File.WC_Method := WCEM_Brackets;
1816
 
1817
      else
1818
         if Stop = Start then
1819
            for J in WC_Encoding_Letters'Range loop
1820
               if File.Form (Start) = WC_Encoding_Letters (J) then
1821
                  File.WC_Method := J;
1822
                  return;
1823
               end if;
1824
            end loop;
1825
         end if;
1826
 
1827
         Close (File);
1828
         raise Use_Error with "invalid WCEM form parameter";
1829
      end if;
1830
   end Set_WCEM;
1831
 
1832
   ---------------
1833
   -- Skip_Line --
1834
   ---------------
1835
 
1836
   procedure Skip_Line
1837
     (File    : File_Type;
1838
      Spacing : Positive_Count := 1)
1839
   is
1840
      ch : int;
1841
 
1842
   begin
1843
      --  Raise Constraint_Error if out of range value. The reason for this
1844
      --  explicit test is that we don't want junk values around, even if
1845
      --  checks are off in the caller.
1846
 
1847
      if not Spacing'Valid then
1848
         raise Constraint_Error;
1849
      end if;
1850
 
1851
      FIO.Check_Read_Status (AP (File));
1852
 
1853
      for L in 1 .. Spacing loop
1854
         if File.Before_LM then
1855
            File.Before_LM := False;
1856
 
1857
            --  Note that if File.Before_LM_PM is currently set, we also have
1858
            --  to reset it (because it makes sense for Before_LM_PM to be set
1859
            --  only when Before_LM is also set). This is done later on in this
1860
            --  subprogram, as soon as Before_LM_PM has been taken into account
1861
            --  for the purpose of page and line counts.
1862
 
1863
         else
1864
            ch := Getc (File);
1865
 
1866
            --  If at end of file now, then immediately raise End_Error. Note
1867
            --  that we can never be positioned between a line mark and a page
1868
            --  mark, so if we are at the end of file, we cannot logically be
1869
            --  before the implicit page mark that is at the end of the file.
1870
 
1871
            --  For the same reason, we do not need an explicit check for a
1872
            --  page mark. If there is a FF in the middle of a line, the file
1873
            --  is not in canonical format and we do not care about the page
1874
            --  numbers for files other than ones in canonical format.
1875
 
1876
            if ch = EOF then
1877
               raise End_Error;
1878
            end if;
1879
 
1880
            --  If not at end of file, then loop till we get to an LM or EOF.
1881
            --  The latter case happens only in non-canonical files where the
1882
            --  last line is not terminated by LM, but we don't want to blow
1883
            --  up for such files, so we assume an implicit LM in this case.
1884
 
1885
            loop
1886
               exit when ch = LM or else ch = EOF;
1887
               ch := Getc (File);
1888
            end loop;
1889
         end if;
1890
 
1891
         --  We have got past a line mark, now, for a regular file only,
1892
         --  see if a page mark immediately follows this line mark and
1893
         --  if so, skip past the page mark as well. We do not do this
1894
         --  for non-regular files, since it would cause an undesirable
1895
         --  wait for an additional character.
1896
 
1897
         File.Col := 1;
1898
         File.Line := File.Line + 1;
1899
 
1900
         if File.Before_LM_PM then
1901
            File.Page := File.Page + 1;
1902
            File.Line := 1;
1903
            File.Before_LM_PM := False;
1904
 
1905
         elsif File.Is_Regular_File then
1906
            ch := Getc (File);
1907
 
1908
            --  Page mark can be explicit, or implied at the end of the file
1909
 
1910
            if (ch = PM or else ch = EOF)
1911
              and then File.Is_Regular_File
1912
            then
1913
               File.Page := File.Page + 1;
1914
               File.Line := 1;
1915
            else
1916
               Ungetc (ch, File);
1917
            end if;
1918
         end if;
1919
      end loop;
1920
 
1921
      File.Before_Upper_Half_Character := False;
1922
   end Skip_Line;
1923
 
1924
   procedure Skip_Line (Spacing : Positive_Count := 1) is
1925
   begin
1926
      Skip_Line (Current_In, Spacing);
1927
   end Skip_Line;
1928
 
1929
   ---------------
1930
   -- Skip_Page --
1931
   ---------------
1932
 
1933
   procedure Skip_Page (File : File_Type) is
1934
      ch : int;
1935
 
1936
   begin
1937
      FIO.Check_Read_Status (AP (File));
1938
 
1939
      --  If at page mark already, just skip it
1940
 
1941
      if File.Before_LM_PM then
1942
         File.Before_LM := False;
1943
         File.Before_LM_PM := False;
1944
         File.Page := File.Page + 1;
1945
         File.Line := 1;
1946
         File.Col  := 1;
1947
         return;
1948
      end if;
1949
 
1950
      --  This is a bit tricky, if we are logically before an LM then
1951
      --  it is not an error if we are at an end of file now, since we
1952
      --  are not really at it.
1953
 
1954
      if File.Before_LM then
1955
         File.Before_LM := False;
1956
         File.Before_LM_PM := False;
1957
         ch := Getc (File);
1958
 
1959
      --  Otherwise we do raise End_Error if we are at the end of file now
1960
 
1961
      else
1962
         ch := Getc (File);
1963
 
1964
         if ch = EOF then
1965
            raise End_Error;
1966
         end if;
1967
      end if;
1968
 
1969
      --  Now we can just rumble along to the next page mark, or to the
1970
      --  end of file, if that comes first. The latter case happens when
1971
      --  the page mark is implied at the end of file.
1972
 
1973
      loop
1974
         exit when ch = EOF
1975
           or else (ch = PM and then File.Is_Regular_File);
1976
         ch := Getc (File);
1977
      end loop;
1978
 
1979
      File.Page := File.Page + 1;
1980
      File.Line := 1;
1981
      File.Col  := 1;
1982
      File.Before_Upper_Half_Character := False;
1983
   end Skip_Page;
1984
 
1985
   procedure Skip_Page is
1986
   begin
1987
      Skip_Page (Current_In);
1988
   end Skip_Page;
1989
 
1990
   --------------------
1991
   -- Standard_Error --
1992
   --------------------
1993
 
1994
   function Standard_Error return File_Type is
1995
   begin
1996
      return Standard_Err;
1997
   end Standard_Error;
1998
 
1999
   function Standard_Error return File_Access is
2000
   begin
2001
      return Standard_Err'Access;
2002
   end Standard_Error;
2003
 
2004
   --------------------
2005
   -- Standard_Input --
2006
   --------------------
2007
 
2008
   function Standard_Input return File_Type is
2009
   begin
2010
      return Standard_In;
2011
   end Standard_Input;
2012
 
2013
   function Standard_Input return File_Access is
2014
   begin
2015
      return Standard_In'Access;
2016
   end Standard_Input;
2017
 
2018
   ---------------------
2019
   -- Standard_Output --
2020
   ---------------------
2021
 
2022
   function Standard_Output return File_Type is
2023
   begin
2024
      return Standard_Out;
2025
   end Standard_Output;
2026
 
2027
   function Standard_Output return File_Access is
2028
   begin
2029
      return Standard_Out'Access;
2030
   end Standard_Output;
2031
 
2032
   --------------------
2033
   -- Terminate_Line --
2034
   --------------------
2035
 
2036
   procedure Terminate_Line (File : File_Type) is
2037
   begin
2038
      FIO.Check_File_Open (AP (File));
2039
 
2040
      --  For file other than In_File, test for needing to terminate last line
2041
 
2042
      if Mode (File) /= In_File then
2043
 
2044
         --  If not at start of line definition need new line
2045
 
2046
         if File.Col /= 1 then
2047
            New_Line (File);
2048
 
2049
         --  For files other than standard error and standard output, we
2050
         --  make sure that an empty file has a single line feed, so that
2051
         --  it is properly formatted. We avoid this for the standard files
2052
         --  because it is too much of a nuisance to have these odd line
2053
         --  feeds when nothing has been written to the file.
2054
 
2055
         --  We also avoid this for files opened in append mode, in
2056
         --  accordance with (RM A.8.2(10))
2057
 
2058
         elsif (File /= Standard_Err and then File /= Standard_Out)
2059
           and then (File.Line = 1 and then File.Page = 1)
2060
           and then Mode (File) = Out_File
2061
         then
2062
            New_Line (File);
2063
         end if;
2064
      end if;
2065
   end Terminate_Line;
2066
 
2067
   ------------
2068
   -- Ungetc --
2069
   ------------
2070
 
2071
   procedure Ungetc (ch : int; File : File_Type) is
2072
   begin
2073
      if ch /= EOF then
2074
         if ungetc (ch, File.Stream) = EOF then
2075
            raise Device_Error;
2076
         end if;
2077
      end if;
2078
   end Ungetc;
2079
 
2080
   -----------
2081
   -- Write --
2082
   -----------
2083
 
2084
   --  This is the primitive Stream Write routine, used when a Text_IO file
2085
   --  is treated directly as a stream using Text_IO.Streams.Stream.
2086
 
2087
   procedure Write
2088
     (File : in out Text_AFCB;
2089
      Item : Stream_Element_Array)
2090
   is
2091
      pragma Warnings (Off, File);
2092
      --  Because in this implementation we don't need IN OUT, we only read
2093
 
2094
      function Has_Translated_Characters return Boolean;
2095
      --  return True if Item array contains a character which will be
2096
      --  translated under the text file mode. There is only one such
2097
      --  character under DOS based systems which is character 10.
2098
 
2099
      text_translation_required : Boolean;
2100
      for text_translation_required'Size use Character'Size;
2101
      pragma Import (C, text_translation_required,
2102
                     "__gnat_text_translation_required");
2103
 
2104
      Siz : constant size_t := Item'Length;
2105
 
2106
      -------------------------------
2107
      -- Has_Translated_Characters --
2108
      -------------------------------
2109
 
2110
      function Has_Translated_Characters return Boolean is
2111
      begin
2112
         for K in Item'Range loop
2113
            if Item (K) = 10 then
2114
               return True;
2115
            end if;
2116
         end loop;
2117
         return False;
2118
      end Has_Translated_Characters;
2119
 
2120
      Needs_Binary_Write : constant Boolean :=
2121
                             text_translation_required
2122
                               and then Has_Translated_Characters;
2123
 
2124
   --  Start of processing for Write
2125
 
2126
   begin
2127
      if File.Mode = FCB.In_File then
2128
         raise Mode_Error;
2129
      end if;
2130
 
2131
      --  Now we do the write. Since this is a text file, it is normally in
2132
      --  text mode, but stream data must be written in binary mode, so we
2133
      --  temporarily set binary mode for the write, resetting it after. This
2134
      --  is done only if needed (i.e. there is some characters in Item which
2135
      --  needs to be written using the binary mode).
2136
      --  These calls have no effect in a system (like Unix) where there is
2137
      --  no distinction between text and binary files.
2138
 
2139
      --  Since the character translation is done at the time the buffer is
2140
      --  written (this is true under Windows) we first flush current buffer
2141
      --  with text mode if needed.
2142
 
2143
      if Needs_Binary_Write then
2144
         if fflush (File.Stream) = -1 then
2145
            raise Device_Error;
2146
         end if;
2147
 
2148
         set_binary_mode (fileno (File.Stream));
2149
      end if;
2150
 
2151
      if fwrite (Item'Address, 1, Siz, File.Stream) /= Siz then
2152
         raise Device_Error;
2153
      end if;
2154
 
2155
      --  At this point we need to flush the buffer using the binary mode then
2156
      --  we reset to text mode.
2157
 
2158
      if Needs_Binary_Write then
2159
         if fflush (File.Stream) = -1 then
2160
            raise Device_Error;
2161
         end if;
2162
 
2163
         set_text_mode (fileno (File.Stream));
2164
      end if;
2165
   end Write;
2166
 
2167
begin
2168
   --  Initialize Standard Files
2169
 
2170
   for J in WC_Encoding_Method loop
2171
      if WC_Encoding = WC_Encoding_Letters (J) then
2172
         Default_WCEM := J;
2173
      end if;
2174
   end loop;
2175
 
2176
   Initialize_Standard_Files;
2177
 
2178
   FIO.Chain_File (AP (Standard_In));
2179
   FIO.Chain_File (AP (Standard_Out));
2180
   FIO.Chain_File (AP (Standard_Err));
2181
 
2182
end Ada.Text_IO;

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