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1 281 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) 1992-2009, 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.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)
695
   is
696
      ch : int;
697
 
698
   begin
699
      FIO.Check_Read_Status (AP (File));
700
      Last := Item'First - 1;
701
 
702
      --  Immediate exit for null string, this is a case in which we do not
703
      --  need to test for end of file and we do not skip a line mark under
704
      --  any circumstances.
705
 
706
      if Last >= Item'Last then
707
         return;
708
      end if;
709
 
710
      --  Here we have at least one character, if we are immediately before
711
      --  a line mark, then we will just skip past it storing no characters.
712
 
713
      if File.Before_LM then
714
         File.Before_LM := False;
715
         File.Before_LM_PM := False;
716
 
717
      --  Otherwise we need to read some characters
718
 
719
      else
720
         ch := Getc (File);
721
 
722
         --  If we are at the end of file now, it means we are trying to
723
         --  skip a file terminator and we raise End_Error (RM A.10.7(20))
724
 
725
         if ch = EOF then
726
            raise End_Error;
727
         end if;
728
 
729
         --  Loop through characters. Don't bother if we hit a page mark,
730
         --  since in normal files, page marks can only follow line marks
731
         --  in any case and we only promise to treat the page nonsense
732
         --  correctly in the absense of such rogue page marks.
733
 
734
         loop
735
            --  Exit the loop if read is terminated by encountering line mark
736
 
737
            exit when ch = LM;
738
 
739
            --  Otherwise store the character, note that we know that ch is
740
            --  something other than LM or EOF. It could possibly be a page
741
            --  mark if there is a stray page mark in the middle of a line,
742
            --  but this is not an official page mark in any case, since
743
            --  official page marks can only follow a line mark. The whole
744
            --  page business is pretty much nonsense anyway, so we do not
745
            --  want to waste time trying to make sense out of non-standard
746
            --  page marks in the file! This means that the behavior of
747
            --  Get_Line is different from repeated Get of a character, but
748
            --  that's too bad. We only promise that page numbers etc make
749
            --  sense if the file is formatted in a standard manner.
750
 
751
            --  Note: we do not adjust the column number because it is quicker
752
            --  to adjust it once at the end of the operation than incrementing
753
            --  it each time around the loop.
754
 
755
            Last := Last + 1;
756
            Item (Last) := Character'Val (ch);
757
 
758
            --  All done if the string is full, this is the case in which
759
            --  we do not skip the following line mark. We need to adjust
760
            --  the column number in this case.
761
 
762
            if Last = Item'Last then
763
               File.Col := File.Col + Count (Item'Length);
764
               return;
765
            end if;
766
 
767
            --  Otherwise read next character. We also exit from the loop if
768
            --  we read an end of file. This is the case where the last line
769
            --  is not terminated with a line mark, and we consider that there
770
            --  is an implied line mark in this case (this is a non-standard
771
            --  file, but it is nice to treat it reasonably).
772
 
773
            ch := Getc (File);
774
            exit when ch = EOF;
775
         end loop;
776
      end if;
777
 
778
      --  We have skipped past, but not stored, a line mark. Skip following
779
      --  page mark if one follows, but do not do this for a non-regular
780
      --  file (since otherwise we get annoying wait for an extra character)
781
 
782
      File.Line := File.Line + 1;
783
      File.Col := 1;
784
 
785
      if File.Before_LM_PM then
786
         File.Line := 1;
787
         File.Before_LM_PM := False;
788
         File.Page := File.Page + 1;
789
 
790
      elsif File.Is_Regular_File then
791
         ch := Getc (File);
792
 
793
         if ch = PM and then File.Is_Regular_File then
794
            File.Line := 1;
795
            File.Page := File.Page + 1;
796
         else
797
            Ungetc (ch, File);
798
         end if;
799
      end if;
800
   end Get_Line;
801
 
802
   procedure Get_Line
803
     (Item : out String;
804
      Last : out Natural)
805
   is
806
   begin
807
      Get_Line (Current_In, Item, Last);
808
   end Get_Line;
809
 
810
   function Get_Line (File : File_Type) return String is
811
      Buffer : String (1 .. 500);
812
      Last   : Natural;
813
 
814
      function Get_Rest (S : String) return String;
815
      --  This is a recursive function that reads the rest of the line and
816
      --  returns it. S is the part read so far.
817
 
818
      --------------
819
      -- Get_Rest --
820
      --------------
821
 
822
      function Get_Rest (S : String) return String is
823
 
824
         --  Each time we allocate a buffer the same size as what we have
825
         --  read so far. This limits us to a logarithmic number of calls
826
         --  to Get_Rest and also ensures only a linear use of stack space.
827
 
828
         Buffer : String (1 .. S'Length);
829
         Last   : Natural;
830
 
831
      begin
832
         Get_Line (File, Buffer, Last);
833
 
834
         declare
835
            R : constant String := S & Buffer (1 .. Last);
836
         begin
837
            if Last < Buffer'Last then
838
               return R;
839
            else
840
               return Get_Rest (R);
841
            end if;
842
         end;
843
      end Get_Rest;
844
 
845
   --  Start of processing for Get_Line
846
 
847
   begin
848
      Get_Line (File, Buffer, Last);
849
 
850
      if Last < Buffer'Last then
851
         return Buffer (1 .. Last);
852
      else
853
         return Get_Rest (Buffer (1 .. Last));
854
      end if;
855
   end Get_Line;
856
 
857
   function Get_Line return String is
858
   begin
859
      return Get_Line (Current_In);
860
   end Get_Line;
861
 
862
   -------------------------
863
   -- Get_Upper_Half_Char --
864
   -------------------------
865
 
866
   function Get_Upper_Half_Char
867
     (C    : Character;
868
      File : File_Type) return Character
869
   is
870
      Result : Wide_Character;
871
 
872
      function In_Char return Character;
873
      --  Function used to obtain additional characters it the wide character
874
      --  sequence is more than one character long.
875
 
876
      function WC_In is new Char_Sequence_To_Wide_Char (In_Char);
877
 
878
      -------------
879
      -- In_Char --
880
      -------------
881
 
882
      function In_Char return Character is
883
         ch : constant Integer := Getc (File);
884
      begin
885
         if ch = EOF then
886
            raise End_Error;
887
         else
888
            return Character'Val (ch);
889
         end if;
890
      end In_Char;
891
 
892
   --  Start of processing for Get_Upper_Half_Char
893
 
894
   begin
895
      Result := WC_In (C, File.WC_Method);
896
 
897
      if Wide_Character'Pos (Result) > 16#FF# then
898
         raise Constraint_Error with
899
           "invalid wide character in Text_'I'O input";
900
      else
901
         return Character'Val (Wide_Character'Pos (Result));
902
      end if;
903
   end Get_Upper_Half_Char;
904
 
905
   -------------------------------
906
   -- Get_Upper_Half_Char_Immed --
907
   -------------------------------
908
 
909
   function Get_Upper_Half_Char_Immed
910
     (C    : Character;
911
      File : File_Type) return Character
912
   is
913
      Result : Wide_Character;
914
 
915
      function In_Char return Character;
916
      --  Function used to obtain additional characters it the wide character
917
      --  sequence is more than one character long.
918
 
919
      function WC_In is new Char_Sequence_To_Wide_Char (In_Char);
920
 
921
      -------------
922
      -- In_Char --
923
      -------------
924
 
925
      function In_Char return Character is
926
         ch : constant Integer := Getc_Immed (File);
927
      begin
928
         if ch = EOF then
929
            raise End_Error;
930
         else
931
            return Character'Val (ch);
932
         end if;
933
      end In_Char;
934
 
935
   --  Start of processing for Get_Upper_Half_Char_Immed
936
 
937
   begin
938
      Result := WC_In (C, File.WC_Method);
939
 
940
      if Wide_Character'Pos (Result) > 16#FF# then
941
         raise Constraint_Error with
942
           "invalid wide character in Text_'I'O input";
943
      else
944
         return Character'Val (Wide_Character'Pos (Result));
945
      end if;
946
   end Get_Upper_Half_Char_Immed;
947
 
948
   ----------
949
   -- Getc --
950
   ----------
951
 
952
   function Getc (File : File_Type) return int is
953
      ch : int;
954
 
955
   begin
956
      ch := fgetc (File.Stream);
957
 
958
      if ch = EOF and then ferror (File.Stream) /= 0 then
959
         raise Device_Error;
960
      else
961
         return ch;
962
      end if;
963
   end Getc;
964
 
965
   ----------------
966
   -- Getc_Immed --
967
   ----------------
968
 
969
   function Getc_Immed (File : File_Type) return int is
970
      ch          : int;
971
      end_of_file : int;
972
 
973
      procedure getc_immediate
974
        (stream : FILEs; ch : out int; end_of_file : out int);
975
      pragma Import (C, getc_immediate, "getc_immediate");
976
 
977
   begin
978
      FIO.Check_Read_Status (AP (File));
979
 
980
      if File.Before_LM then
981
         File.Before_LM := False;
982
         File.Before_LM_PM := False;
983
         ch := LM;
984
 
985
      else
986
         getc_immediate (File.Stream, ch, end_of_file);
987
 
988
         if ferror (File.Stream) /= 0 then
989
            raise Device_Error;
990
         elsif end_of_file /= 0 then
991
            return EOF;
992
         end if;
993
      end if;
994
 
995
      return ch;
996
   end Getc_Immed;
997
 
998
   ------------------------------
999
   -- Has_Upper_Half_Character --
1000
   ------------------------------
1001
 
1002
   function Has_Upper_Half_Character (Item : String) return Boolean is
1003
   begin
1004
      for J in Item'Range loop
1005
         if Character'Pos (Item (J)) >= 16#80# then
1006
            return True;
1007
         end if;
1008
      end loop;
1009
 
1010
      return False;
1011
   end Has_Upper_Half_Character;
1012
 
1013
   -------------------------------
1014
   -- Initialize_Standard_Files --
1015
   -------------------------------
1016
 
1017
   procedure Initialize_Standard_Files is
1018
   begin
1019
      Standard_Err.Stream            := stderr;
1020
      Standard_Err.Name              := Err_Name'Access;
1021
      Standard_Err.Form              := Null_Str'Unrestricted_Access;
1022
      Standard_Err.Mode              := FCB.Out_File;
1023
      Standard_Err.Is_Regular_File   := is_regular_file (fileno (stderr)) /= 0;
1024
      Standard_Err.Is_Temporary_File := False;
1025
      Standard_Err.Is_System_File    := True;
1026
      Standard_Err.Is_Text_File      := True;
1027
      Standard_Err.Access_Method     := 'T';
1028
      Standard_Err.Self              := Standard_Err;
1029
      Standard_Err.WC_Method         := Default_WCEM;
1030
 
1031
      Standard_In.Stream             := stdin;
1032
      Standard_In.Name               := In_Name'Access;
1033
      Standard_In.Form               := Null_Str'Unrestricted_Access;
1034
      Standard_In.Mode               := FCB.In_File;
1035
      Standard_In.Is_Regular_File    := is_regular_file (fileno (stdin)) /= 0;
1036
      Standard_In.Is_Temporary_File  := False;
1037
      Standard_In.Is_System_File     := True;
1038
      Standard_In.Is_Text_File       := True;
1039
      Standard_In.Access_Method      := 'T';
1040
      Standard_In.Self               := Standard_In;
1041
      Standard_In.WC_Method          := Default_WCEM;
1042
 
1043
      Standard_Out.Stream            := stdout;
1044
      Standard_Out.Name              := Out_Name'Access;
1045
      Standard_Out.Form              := Null_Str'Unrestricted_Access;
1046
      Standard_Out.Mode              := FCB.Out_File;
1047
      Standard_Out.Is_Regular_File   := is_regular_file (fileno (stdout)) /= 0;
1048
      Standard_Out.Is_Temporary_File := False;
1049
      Standard_Out.Is_System_File    := True;
1050
      Standard_Out.Is_Text_File      := True;
1051
      Standard_Out.Access_Method     := 'T';
1052
      Standard_Out.Self              := Standard_Out;
1053
      Standard_Out.WC_Method         := Default_WCEM;
1054
 
1055
      FIO.Make_Unbuffered (AP (Standard_Out));
1056
      FIO.Make_Unbuffered (AP (Standard_Err));
1057
   end Initialize_Standard_Files;
1058
 
1059
   -------------
1060
   -- Is_Open --
1061
   -------------
1062
 
1063
   function Is_Open (File : File_Type) return Boolean is
1064
   begin
1065
      return FIO.Is_Open (AP (File));
1066
   end Is_Open;
1067
 
1068
   ----------
1069
   -- Line --
1070
   ----------
1071
 
1072
   --  Note: we assume that it is impossible in practice for the line
1073
   --  to exceed the value of Count'Last, i.e. no check is required for
1074
   --  overflow raising layout error.
1075
 
1076
   function Line (File : File_Type) return Positive_Count is
1077
   begin
1078
      FIO.Check_File_Open (AP (File));
1079
      return File.Line;
1080
   end Line;
1081
 
1082
   function Line return Positive_Count is
1083
   begin
1084
      return Line (Current_Out);
1085
   end Line;
1086
 
1087
   -----------------
1088
   -- Line_Length --
1089
   -----------------
1090
 
1091
   function Line_Length (File : File_Type) return Count is
1092
   begin
1093
      FIO.Check_Write_Status (AP (File));
1094
      return File.Line_Length;
1095
   end Line_Length;
1096
 
1097
   function Line_Length return Count is
1098
   begin
1099
      return Line_Length (Current_Out);
1100
   end Line_Length;
1101
 
1102
   ----------------
1103
   -- Look_Ahead --
1104
   ----------------
1105
 
1106
   procedure Look_Ahead
1107
     (File        : File_Type;
1108
      Item        : out Character;
1109
      End_Of_Line : out Boolean)
1110
   is
1111
      ch : int;
1112
 
1113
   begin
1114
      FIO.Check_Read_Status (AP (File));
1115
 
1116
      --  If we are logically before a line mark, we can return immediately
1117
 
1118
      if File.Before_LM then
1119
         End_Of_Line := True;
1120
         Item := ASCII.NUL;
1121
 
1122
      --  If we are before an upper half character just return it (this can
1123
      --  happen if there are two calls to Look_Ahead in a row).
1124
 
1125
      elsif File.Before_Upper_Half_Character then
1126
         End_Of_Line := False;
1127
         Item := File.Saved_Upper_Half_Character;
1128
 
1129
      --  Otherwise we must read a character from the input stream
1130
 
1131
      else
1132
         ch := Getc (File);
1133
 
1134
         if ch = LM
1135
           or else ch = EOF
1136
           or else (ch = PM and then File.Is_Regular_File)
1137
         then
1138
            End_Of_Line := True;
1139
            Ungetc (ch, File);
1140
            Item := ASCII.NUL;
1141
 
1142
         --  Case where character obtained does not represent the start of an
1143
         --  encoded sequence so it stands for itself and we can unget it with
1144
         --  no difficulty.
1145
 
1146
         elsif not Is_Start_Of_Encoding
1147
                     (Character'Val (ch), File.WC_Method)
1148
         then
1149
            End_Of_Line := False;
1150
            Ungetc (ch, File);
1151
            Item := Character'Val (ch);
1152
 
1153
         --  For the start of an encoding, we read the character using the
1154
         --  Get_Upper_Half_Char routine. It will occupy more than one byte
1155
         --  so we can't put it back with ungetc. Instead we save it in the
1156
         --  control block, setting a flag that everyone interested in reading
1157
         --  characters must test before reading the stream.
1158
 
1159
         else
1160
            Item := Get_Upper_Half_Char (Character'Val (ch), File);
1161
            End_Of_Line := False;
1162
            File.Saved_Upper_Half_Character := Item;
1163
            File.Before_Upper_Half_Character := True;
1164
         end if;
1165
      end if;
1166
   end Look_Ahead;
1167
 
1168
   procedure Look_Ahead
1169
     (Item        : out Character;
1170
      End_Of_Line : out Boolean)
1171
   is
1172
   begin
1173
      Look_Ahead (Current_In, Item, End_Of_Line);
1174
   end Look_Ahead;
1175
 
1176
   ----------
1177
   -- Mode --
1178
   ----------
1179
 
1180
   function Mode (File : File_Type) return File_Mode is
1181
   begin
1182
      return To_TIO (FIO.Mode (AP (File)));
1183
   end Mode;
1184
 
1185
   ----------
1186
   -- Name --
1187
   ----------
1188
 
1189
   function Name (File : File_Type) return String is
1190
   begin
1191
      return FIO.Name (AP (File));
1192
   end Name;
1193
 
1194
   --------------
1195
   -- New_Line --
1196
   --------------
1197
 
1198
   procedure New_Line
1199
     (File    : File_Type;
1200
      Spacing : Positive_Count := 1)
1201
   is
1202
   begin
1203
      --  Raise Constraint_Error if out of range value. The reason for this
1204
      --  explicit test is that we don't want junk values around, even if
1205
      --  checks are off in the caller.
1206
 
1207
      if not Spacing'Valid then
1208
         raise Constraint_Error;
1209
      end if;
1210
 
1211
      FIO.Check_Write_Status (AP (File));
1212
 
1213
      for K in 1 .. Spacing loop
1214
         Putc (LM, File);
1215
         File.Line := File.Line + 1;
1216
 
1217
         if File.Page_Length /= 0
1218
           and then File.Line > File.Page_Length
1219
         then
1220
            Putc (PM, File);
1221
            File.Line := 1;
1222
            File.Page := File.Page + 1;
1223
         end if;
1224
      end loop;
1225
 
1226
      File.Col := 1;
1227
   end New_Line;
1228
 
1229
   procedure New_Line (Spacing : Positive_Count := 1) is
1230
   begin
1231
      New_Line (Current_Out, Spacing);
1232
   end New_Line;
1233
 
1234
   --------------
1235
   -- New_Page --
1236
   --------------
1237
 
1238
   procedure New_Page (File : File_Type) is
1239
   begin
1240
      FIO.Check_Write_Status (AP (File));
1241
 
1242
      if File.Col /= 1 or else File.Line = 1 then
1243
         Putc (LM, File);
1244
      end if;
1245
 
1246
      Putc (PM, File);
1247
      File.Page := File.Page + 1;
1248
      File.Line := 1;
1249
      File.Col := 1;
1250
   end New_Page;
1251
 
1252
   procedure New_Page is
1253
   begin
1254
      New_Page (Current_Out);
1255
   end New_Page;
1256
 
1257
   -----------
1258
   -- Nextc --
1259
   -----------
1260
 
1261
   function Nextc (File : File_Type) return int is
1262
      ch : int;
1263
 
1264
   begin
1265
      ch := fgetc (File.Stream);
1266
 
1267
      if ch = EOF then
1268
         if ferror (File.Stream) /= 0 then
1269
            raise Device_Error;
1270
         end if;
1271
 
1272
      else
1273
         if ungetc (ch, File.Stream) = EOF then
1274
            raise Device_Error;
1275
         end if;
1276
      end if;
1277
 
1278
      return ch;
1279
   end Nextc;
1280
 
1281
   ----------
1282
   -- Open --
1283
   ----------
1284
 
1285
   procedure Open
1286
     (File : in out File_Type;
1287
      Mode : File_Mode;
1288
      Name : String;
1289
      Form : String := "")
1290
   is
1291
      Dummy_File_Control_Block : Text_AFCB;
1292
      pragma Warnings (Off, Dummy_File_Control_Block);
1293
      --  Yes, we know this is never assigned a value, only the tag
1294
      --  is used for dispatching purposes, so that's expected.
1295
 
1296
   begin
1297
      FIO.Open (File_Ptr  => AP (File),
1298
                Dummy_FCB => Dummy_File_Control_Block,
1299
                Mode      => To_FCB (Mode),
1300
                Name      => Name,
1301
                Form      => Form,
1302
                Amethod   => 'T',
1303
                Creat     => False,
1304
                Text      => True);
1305
 
1306
      File.Self := File;
1307
      Set_WCEM (File);
1308
   end Open;
1309
 
1310
   ----------
1311
   -- Page --
1312
   ----------
1313
 
1314
   --  Note: we assume that it is impossible in practice for the page
1315
   --  to exceed the value of Count'Last, i.e. no check is required for
1316
   --  overflow raising layout error.
1317
 
1318
   function Page (File : File_Type) return Positive_Count is
1319
   begin
1320
      FIO.Check_File_Open (AP (File));
1321
      return File.Page;
1322
   end Page;
1323
 
1324
   function Page return Positive_Count is
1325
   begin
1326
      return Page (Current_Out);
1327
   end Page;
1328
 
1329
   -----------------
1330
   -- Page_Length --
1331
   -----------------
1332
 
1333
   function Page_Length (File : File_Type) return Count is
1334
   begin
1335
      FIO.Check_Write_Status (AP (File));
1336
      return File.Page_Length;
1337
   end Page_Length;
1338
 
1339
   function Page_Length return Count is
1340
   begin
1341
      return Page_Length (Current_Out);
1342
   end Page_Length;
1343
 
1344
   ---------
1345
   -- Put --
1346
   ---------
1347
 
1348
   procedure Put
1349
     (File : File_Type;
1350
      Item : Character)
1351
   is
1352
   begin
1353
      FIO.Check_Write_Status (AP (File));
1354
 
1355
      if File.Line_Length /= 0 and then File.Col > File.Line_Length then
1356
         New_Line (File);
1357
      end if;
1358
 
1359
      --  If lower half character, or brackets encoding, output directly
1360
 
1361
      if Character'Pos (Item) < 16#80#
1362
        or else File.WC_Method = WCEM_Brackets
1363
      then
1364
         if fputc (Character'Pos (Item), File.Stream) = EOF then
1365
            raise Device_Error;
1366
         end if;
1367
 
1368
      --  Case of upper half character with non-brackets encoding
1369
 
1370
      else
1371
         Put_Encoded (File, Item);
1372
      end if;
1373
 
1374
      File.Col := File.Col + 1;
1375
   end Put;
1376
 
1377
   procedure Put (Item : Character) is
1378
   begin
1379
      FIO.Check_Write_Status (AP (Current_Out));
1380
 
1381
      if Current_Out.Line_Length /= 0
1382
        and then Current_Out.Col > Current_Out.Line_Length
1383
      then
1384
         New_Line (Current_Out);
1385
      end if;
1386
 
1387
      --  If lower half character, or brackets encoding, output directly
1388
 
1389
      if Character'Pos (Item) < 16#80#
1390
        or else Default_WCEM = WCEM_Brackets
1391
      then
1392
         if fputc (Character'Pos (Item), Current_Out.Stream) = EOF then
1393
            raise Device_Error;
1394
         end if;
1395
 
1396
      --  Case of upper half character with non-brackets encoding
1397
 
1398
      else
1399
         Put_Encoded (Current_Out, Item);
1400
      end if;
1401
 
1402
      Current_Out.Col := Current_Out.Col + 1;
1403
   end Put;
1404
 
1405
   ---------
1406
   -- Put --
1407
   ---------
1408
 
1409
   procedure Put
1410
     (File : File_Type;
1411
      Item : String)
1412
   is
1413
   begin
1414
      FIO.Check_Write_Status (AP (File));
1415
 
1416
      --  Only have something to do if string is non-null
1417
 
1418
      if Item'Length > 0 then
1419
 
1420
         --  If we have bounded lines, or if the file encoding is other than
1421
         --  Brackets and the string has at least one upper half character,
1422
         --  then output the string character by character.
1423
 
1424
         if File.Line_Length /= 0
1425
           or else (File.WC_Method /= WCEM_Brackets
1426
                      and then Has_Upper_Half_Character (Item))
1427
         then
1428
            for J in Item'Range loop
1429
               Put (File, Item (J));
1430
            end loop;
1431
 
1432
         --  Otherwise we can output the entire string at once. Note that if
1433
         --  there are LF or FF characters in the string, we do not bother to
1434
         --  count them as line or page terminators.
1435
 
1436
         else
1437
            FIO.Write_Buf (AP (File), Item'Address, Item'Length);
1438
            File.Col := File.Col + Item'Length;
1439
         end if;
1440
      end if;
1441
   end Put;
1442
 
1443
   procedure Put (Item : String) is
1444
   begin
1445
      Put (Current_Out, Item);
1446
   end Put;
1447
 
1448
   -----------------
1449
   -- Put_Encoded --
1450
   -----------------
1451
 
1452
   procedure Put_Encoded (File : File_Type; Char : Character) is
1453
      procedure Out_Char (C : Character);
1454
      --  Procedure to output one character of an upper half encoded sequence
1455
 
1456
      procedure WC_Out is new Wide_Char_To_Char_Sequence (Out_Char);
1457
 
1458
      --------------
1459
      -- Out_Char --
1460
      --------------
1461
 
1462
      procedure Out_Char (C : Character) is
1463
      begin
1464
         Putc (Character'Pos (C), File);
1465
      end Out_Char;
1466
 
1467
   --  Start of processing for Put_Encoded
1468
 
1469
   begin
1470
      WC_Out (Wide_Character'Val (Character'Pos (Char)), File.WC_Method);
1471
   end Put_Encoded;
1472
 
1473
   --------------
1474
   -- Put_Line --
1475
   --------------
1476
 
1477
   procedure Put_Line
1478
     (File : File_Type;
1479
      Item : String)
1480
   is
1481
      Ilen   : Natural := Item'Length;
1482
      Istart : Natural := Item'First;
1483
 
1484
   begin
1485
      FIO.Check_Write_Status (AP (File));
1486
 
1487
      --  If we have bounded lines, or if the file encoding is other than
1488
      --  Brackets and the string has at least one upper half character, then
1489
      --  output the string character by character.
1490
 
1491
      if File.Line_Length /= 0
1492
        or else (File.WC_Method /= WCEM_Brackets
1493
                   and then Has_Upper_Half_Character (Item))
1494
      then
1495
         for J in Item'Range loop
1496
            Put (File, Item (J));
1497
         end loop;
1498
 
1499
         New_Line (File);
1500
         return;
1501
      end if;
1502
 
1503
      --  Normal case where we do not need to output character by character
1504
 
1505
      --  We setup a single string that has the necessary terminators and
1506
      --  then write it with a single call. The reason for doing this is
1507
      --  that it gives better behavior for the use of Put_Line in multi-
1508
      --  tasking programs, since often the OS will treat the entire put
1509
      --  operation as an atomic operation.
1510
 
1511
      --  We only do this if the message is 512 characters or less in length,
1512
      --  since otherwise Put_Line would use an unbounded amount of stack
1513
      --  space and could cause undetected stack overflow. If we have a
1514
      --  longer string, then output the first part separately to avoid this.
1515
 
1516
      if Ilen > 512 then
1517
         FIO.Write_Buf (AP (File), Item'Address, size_t (Ilen - 512));
1518
         Istart := Istart + Ilen - 512;
1519
         Ilen   := 512;
1520
      end if;
1521
 
1522
      --  Now prepare the string with its terminator
1523
 
1524
      declare
1525
         Buffer : String (1 .. Ilen + 2);
1526
         Plen   : size_t;
1527
 
1528
      begin
1529
         Buffer (1 .. Ilen) := Item (Istart .. Item'Last);
1530
         Buffer (Ilen + 1) := Character'Val (LM);
1531
 
1532
         if File.Page_Length /= 0
1533
           and then File.Line > File.Page_Length
1534
         then
1535
            Buffer (Ilen + 2) := Character'Val (PM);
1536
            Plen := size_t (Ilen) + 2;
1537
            File.Line := 1;
1538
            File.Page := File.Page + 1;
1539
 
1540
         else
1541
            Plen := size_t (Ilen) + 1;
1542
            File.Line := File.Line + 1;
1543
         end if;
1544
 
1545
         FIO.Write_Buf (AP (File), Buffer'Address, Plen);
1546
 
1547
         File.Col := 1;
1548
      end;
1549
   end Put_Line;
1550
 
1551
   procedure Put_Line (Item : String) is
1552
   begin
1553
      Put_Line (Current_Out, Item);
1554
   end Put_Line;
1555
 
1556
   ----------
1557
   -- Putc --
1558
   ----------
1559
 
1560
   procedure Putc (ch : int; File : File_Type) is
1561
   begin
1562
      if fputc (ch, File.Stream) = EOF then
1563
         raise Device_Error;
1564
      end if;
1565
   end Putc;
1566
 
1567
   ----------
1568
   -- Read --
1569
   ----------
1570
 
1571
   --  This is the primitive Stream Read routine, used when a Text_IO file
1572
   --  is treated directly as a stream using Text_IO.Streams.Stream.
1573
 
1574
   procedure Read
1575
     (File : in out Text_AFCB;
1576
      Item : out Stream_Element_Array;
1577
      Last : out Stream_Element_Offset)
1578
   is
1579
      Discard_ch : int;
1580
      pragma Warnings (Off, Discard_ch);
1581
 
1582
   begin
1583
      --  Need to deal with Before_Upper_Half_Character ???
1584
 
1585
      if File.Mode /= FCB.In_File then
1586
         raise Mode_Error;
1587
      end if;
1588
 
1589
      --  Deal with case where our logical and physical position do not match
1590
      --  because of being after an LM or LM-PM sequence when in fact we are
1591
      --  logically positioned before it.
1592
 
1593
      if File.Before_LM then
1594
 
1595
         --  If we are before a PM, then it is possible for a stream read
1596
         --  to leave us after the LM and before the PM, which is a bit
1597
         --  odd. The easiest way to deal with this is to unget the PM,
1598
         --  so we are indeed positioned between the characters. This way
1599
         --  further stream read operations will work correctly, and the
1600
         --  effect on text processing is a little weird, but what can
1601
         --  be expected if stream and text input are mixed this way?
1602
 
1603
         if File.Before_LM_PM then
1604
            Discard_ch := ungetc (PM, File.Stream);
1605
            File.Before_LM_PM := False;
1606
         end if;
1607
 
1608
         File.Before_LM := False;
1609
 
1610
         Item (Item'First) := Stream_Element (Character'Pos (ASCII.LF));
1611
 
1612
         if Item'Length = 1 then
1613
            Last := Item'Last;
1614
 
1615
         else
1616
            Last :=
1617
              Item'First +
1618
                Stream_Element_Offset
1619
                  (fread (buffer => Item'Address,
1620
                          index  => size_t (Item'First + 1),
1621
                          size   => 1,
1622
                          count  => Item'Length - 1,
1623
                          stream => File.Stream));
1624
         end if;
1625
 
1626
         return;
1627
      end if;
1628
 
1629
      --  Now we do the read. Since this is a text file, it is normally in
1630
      --  text mode, but stream data must be read in binary mode, so we
1631
      --  temporarily set binary mode for the read, resetting it after.
1632
      --  These calls have no effect in a system (like Unix) where there is
1633
      --  no distinction between text and binary files.
1634
 
1635
      set_binary_mode (fileno (File.Stream));
1636
 
1637
      Last :=
1638
        Item'First +
1639
          Stream_Element_Offset
1640
            (fread (Item'Address, 1, Item'Length, File.Stream)) - 1;
1641
 
1642
      if Last < Item'Last then
1643
         if ferror (File.Stream) /= 0 then
1644
            raise Device_Error;
1645
         end if;
1646
      end if;
1647
 
1648
      set_text_mode (fileno (File.Stream));
1649
   end Read;
1650
 
1651
   -----------
1652
   -- Reset --
1653
   -----------
1654
 
1655
   procedure Reset
1656
     (File : in out File_Type;
1657
      Mode : File_Mode)
1658
   is
1659
   begin
1660
      --  Don't allow change of mode for current file (RM A.10.2(5))
1661
 
1662
      if (File = Current_In  or else
1663
          File = Current_Out or else
1664
          File = Current_Error)
1665
        and then To_FCB (Mode) /= File.Mode
1666
      then
1667
         raise Mode_Error;
1668
      end if;
1669
 
1670
      Terminate_Line (File);
1671
      FIO.Reset (AP (File)'Unrestricted_Access, To_FCB (Mode));
1672
      File.Page := 1;
1673
      File.Line := 1;
1674
      File.Col  := 1;
1675
      File.Line_Length := 0;
1676
      File.Page_Length := 0;
1677
      File.Before_LM := False;
1678
      File.Before_LM_PM := False;
1679
   end Reset;
1680
 
1681
   procedure Reset (File : in out File_Type) is
1682
   begin
1683
      Terminate_Line (File);
1684
      FIO.Reset (AP (File)'Unrestricted_Access);
1685
      File.Page := 1;
1686
      File.Line := 1;
1687
      File.Col  := 1;
1688
      File.Line_Length := 0;
1689
      File.Page_Length := 0;
1690
      File.Before_LM := False;
1691
      File.Before_LM_PM := False;
1692
   end Reset;
1693
 
1694
   -------------
1695
   -- Set_Col --
1696
   -------------
1697
 
1698
   procedure Set_Col
1699
     (File : File_Type;
1700
      To   : Positive_Count)
1701
   is
1702
      ch : int;
1703
 
1704
   begin
1705
      --  Raise Constraint_Error if out of range value. The reason for this
1706
      --  explicit test is that we don't want junk values around, even if
1707
      --  checks are off in the caller.
1708
 
1709
      if not To'Valid then
1710
         raise Constraint_Error;
1711
      end if;
1712
 
1713
      FIO.Check_File_Open (AP (File));
1714
 
1715
      --  Output case
1716
 
1717
      if Mode (File) >= Out_File then
1718
 
1719
         --  Error if we attempt to set Col to a value greater than the
1720
         --  maximum permissible line length.
1721
 
1722
         if File.Line_Length /= 0 and then To > File.Line_Length then
1723
            raise Layout_Error;
1724
         end if;
1725
 
1726
         --  If we are behind current position, then go to start of new line
1727
 
1728
         if To < File.Col then
1729
            New_Line (File);
1730
         end if;
1731
 
1732
         --  Loop to output blanks till we are at the required column
1733
 
1734
         while File.Col < To loop
1735
            Put (File, ' ');
1736
         end loop;
1737
 
1738
      --  Input case
1739
 
1740
      else
1741
         --  If we are logically before a LM, but physically after it, the
1742
         --  file position still reflects the position before the LM, so eat
1743
         --  it now and adjust the file position appropriately.
1744
 
1745
         if File.Before_LM then
1746
            File.Before_LM := False;
1747
            File.Before_LM_PM := False;
1748
            File.Line := File.Line + 1;
1749
            File.Col := 1;
1750
         end if;
1751
 
1752
         --  Loop reading characters till we get one at the required Col value
1753
 
1754
         loop
1755
            --  Read next character. The reason we have to read ahead is to
1756
            --  skip formatting characters, the effect of Set_Col is to set
1757
            --  us to a real character with the right Col value, and format
1758
            --  characters don't count.
1759
 
1760
            ch := Getc (File);
1761
 
1762
            --  Error if we hit an end of file
1763
 
1764
            if ch = EOF then
1765
               raise End_Error;
1766
 
1767
            --  If line mark, eat it and adjust file position
1768
 
1769
            elsif ch = LM then
1770
               File.Line := File.Line + 1;
1771
               File.Col := 1;
1772
 
1773
            --  If recognized page mark, eat it, and adjust file position
1774
 
1775
            elsif ch = PM and then File.Is_Regular_File then
1776
               File.Page := File.Page + 1;
1777
               File.Line := 1;
1778
               File.Col := 1;
1779
 
1780
            --  Otherwise this is the character we are looking for, so put it
1781
            --  back in the input stream (we have not adjusted the file
1782
            --  position yet, so everything is set right after this ungetc).
1783
 
1784
            elsif To = File.Col then
1785
               Ungetc (ch, File);
1786
               return;
1787
 
1788
            --  Keep skipping characters if we are not there yet, updating the
1789
            --  file position past the skipped character.
1790
 
1791
            else
1792
               File.Col := File.Col + 1;
1793
            end if;
1794
         end loop;
1795
      end if;
1796
   end Set_Col;
1797
 
1798
   procedure Set_Col (To : Positive_Count) is
1799
   begin
1800
      Set_Col (Current_Out, To);
1801
   end Set_Col;
1802
 
1803
   ---------------
1804
   -- Set_Error --
1805
   ---------------
1806
 
1807
   procedure Set_Error (File : File_Type) is
1808
   begin
1809
      FIO.Check_Write_Status (AP (File));
1810
      Current_Err := File;
1811
   end Set_Error;
1812
 
1813
   ---------------
1814
   -- Set_Input --
1815
   ---------------
1816
 
1817
   procedure Set_Input (File : File_Type) is
1818
   begin
1819
      FIO.Check_Read_Status (AP (File));
1820
      Current_In := File;
1821
   end Set_Input;
1822
 
1823
   --------------
1824
   -- Set_Line --
1825
   --------------
1826
 
1827
   procedure Set_Line
1828
     (File : File_Type;
1829
      To   : Positive_Count)
1830
   is
1831
   begin
1832
      --  Raise Constraint_Error if out of range value. The reason for this
1833
      --  explicit test is that we don't want junk values around, even if
1834
      --  checks are off in the caller.
1835
 
1836
      if not To'Valid then
1837
         raise Constraint_Error;
1838
      end if;
1839
 
1840
      FIO.Check_File_Open (AP (File));
1841
 
1842
      if To = File.Line then
1843
         return;
1844
      end if;
1845
 
1846
      if Mode (File) >= Out_File then
1847
         if File.Page_Length /= 0 and then To > File.Page_Length then
1848
            raise Layout_Error;
1849
         end if;
1850
 
1851
         if To < File.Line then
1852
            New_Page (File);
1853
         end if;
1854
 
1855
         while File.Line < To loop
1856
            New_Line (File);
1857
         end loop;
1858
 
1859
      else
1860
         while To /= File.Line loop
1861
            Skip_Line (File);
1862
         end loop;
1863
      end if;
1864
   end Set_Line;
1865
 
1866
   procedure Set_Line (To : Positive_Count) is
1867
   begin
1868
      Set_Line (Current_Out, To);
1869
   end Set_Line;
1870
 
1871
   ---------------------
1872
   -- Set_Line_Length --
1873
   ---------------------
1874
 
1875
   procedure Set_Line_Length (File : File_Type; To : Count) is
1876
   begin
1877
      --  Raise Constraint_Error if out of range value. The reason for this
1878
      --  explicit test is that we don't want junk values around, even if
1879
      --  checks are off in the caller.
1880
 
1881
      if not To'Valid then
1882
         raise Constraint_Error;
1883
      end if;
1884
 
1885
      FIO.Check_Write_Status (AP (File));
1886
      File.Line_Length := To;
1887
   end Set_Line_Length;
1888
 
1889
   procedure Set_Line_Length (To : Count) is
1890
   begin
1891
      Set_Line_Length (Current_Out, To);
1892
   end Set_Line_Length;
1893
 
1894
   ----------------
1895
   -- Set_Output --
1896
   ----------------
1897
 
1898
   procedure Set_Output (File : File_Type) is
1899
   begin
1900
      FIO.Check_Write_Status (AP (File));
1901
      Current_Out := File;
1902
   end Set_Output;
1903
 
1904
   ---------------------
1905
   -- Set_Page_Length --
1906
   ---------------------
1907
 
1908
   procedure Set_Page_Length (File : File_Type; To : Count) is
1909
   begin
1910
      --  Raise Constraint_Error if out of range value. The reason for this
1911
      --  explicit test is that we don't want junk values around, even if
1912
      --  checks are off in the caller.
1913
 
1914
      if not To'Valid then
1915
         raise Constraint_Error;
1916
      end if;
1917
 
1918
      FIO.Check_Write_Status (AP (File));
1919
      File.Page_Length := To;
1920
   end Set_Page_Length;
1921
 
1922
   procedure Set_Page_Length (To : Count) is
1923
   begin
1924
      Set_Page_Length (Current_Out, To);
1925
   end Set_Page_Length;
1926
 
1927
   --------------
1928
   -- Set_WCEM --
1929
   --------------
1930
 
1931
   procedure Set_WCEM (File : in out File_Type) is
1932
      Start : Natural;
1933
      Stop  : Natural;
1934
 
1935
   begin
1936
      File.WC_Method := WCEM_Brackets;
1937
      FIO.Form_Parameter (File.Form.all, "wcem", Start, Stop);
1938
 
1939
      if Start = 0 then
1940
         File.WC_Method := WCEM_Brackets;
1941
 
1942
      else
1943
         if Stop = Start then
1944
            for J in WC_Encoding_Letters'Range loop
1945
               if File.Form (Start) = WC_Encoding_Letters (J) then
1946
                  File.WC_Method := J;
1947
                  return;
1948
               end if;
1949
            end loop;
1950
         end if;
1951
 
1952
         Close (File);
1953
         raise Use_Error with "invalid WCEM form parameter";
1954
      end if;
1955
   end Set_WCEM;
1956
 
1957
   ---------------
1958
   -- Skip_Line --
1959
   ---------------
1960
 
1961
   procedure Skip_Line
1962
     (File    : File_Type;
1963
      Spacing : Positive_Count := 1)
1964
   is
1965
      ch : int;
1966
 
1967
   begin
1968
      --  Raise Constraint_Error if out of range value. The reason for this
1969
      --  explicit test is that we don't want junk values around, even if
1970
      --  checks are off in the caller.
1971
 
1972
      if not Spacing'Valid then
1973
         raise Constraint_Error;
1974
      end if;
1975
 
1976
      FIO.Check_Read_Status (AP (File));
1977
 
1978
      for L in 1 .. Spacing loop
1979
         if File.Before_LM then
1980
            File.Before_LM := False;
1981
 
1982
            --  Note that if File.Before_LM_PM is currently set, we also have
1983
            --  to reset it (because it makes sense for Before_LM_PM to be set
1984
            --  only when Before_LM is also set). This is done later on in this
1985
            --  subprogram, as soon as Before_LM_PM has been taken into account
1986
            --  for the purpose of page and line counts.
1987
 
1988
         else
1989
            ch := Getc (File);
1990
 
1991
            --  If at end of file now, then immediately raise End_Error. Note
1992
            --  that we can never be positioned between a line mark and a page
1993
            --  mark, so if we are at the end of file, we cannot logically be
1994
            --  before the implicit page mark that is at the end of the file.
1995
 
1996
            --  For the same reason, we do not need an explicit check for a
1997
            --  page mark. If there is a FF in the middle of a line, the file
1998
            --  is not in canonical format and we do not care about the page
1999
            --  numbers for files other than ones in canonical format.
2000
 
2001
            if ch = EOF then
2002
               raise End_Error;
2003
            end if;
2004
 
2005
            --  If not at end of file, then loop till we get to an LM or EOF.
2006
            --  The latter case happens only in non-canonical files where the
2007
            --  last line is not terminated by LM, but we don't want to blow
2008
            --  up for such files, so we assume an implicit LM in this case.
2009
 
2010
            loop
2011
               exit when ch = LM or else ch = EOF;
2012
               ch := Getc (File);
2013
            end loop;
2014
         end if;
2015
 
2016
         --  We have got past a line mark, now, for a regular file only,
2017
         --  see if a page mark immediately follows this line mark and
2018
         --  if so, skip past the page mark as well. We do not do this
2019
         --  for non-regular files, since it would cause an undesirable
2020
         --  wait for an additional character.
2021
 
2022
         File.Col := 1;
2023
         File.Line := File.Line + 1;
2024
 
2025
         if File.Before_LM_PM then
2026
            File.Page := File.Page + 1;
2027
            File.Line := 1;
2028
            File.Before_LM_PM := False;
2029
 
2030
         elsif File.Is_Regular_File then
2031
            ch := Getc (File);
2032
 
2033
            --  Page mark can be explicit, or implied at the end of the file
2034
 
2035
            if (ch = PM or else ch = EOF)
2036
              and then File.Is_Regular_File
2037
            then
2038
               File.Page := File.Page + 1;
2039
               File.Line := 1;
2040
            else
2041
               Ungetc (ch, File);
2042
            end if;
2043
         end if;
2044
      end loop;
2045
 
2046
      File.Before_Upper_Half_Character := False;
2047
   end Skip_Line;
2048
 
2049
   procedure Skip_Line (Spacing : Positive_Count := 1) is
2050
   begin
2051
      Skip_Line (Current_In, Spacing);
2052
   end Skip_Line;
2053
 
2054
   ---------------
2055
   -- Skip_Page --
2056
   ---------------
2057
 
2058
   procedure Skip_Page (File : File_Type) is
2059
      ch : int;
2060
 
2061
   begin
2062
      FIO.Check_Read_Status (AP (File));
2063
 
2064
      --  If at page mark already, just skip it
2065
 
2066
      if File.Before_LM_PM then
2067
         File.Before_LM := False;
2068
         File.Before_LM_PM := False;
2069
         File.Page := File.Page + 1;
2070
         File.Line := 1;
2071
         File.Col  := 1;
2072
         return;
2073
      end if;
2074
 
2075
      --  This is a bit tricky, if we are logically before an LM then
2076
      --  it is not an error if we are at an end of file now, since we
2077
      --  are not really at it.
2078
 
2079
      if File.Before_LM then
2080
         File.Before_LM := False;
2081
         File.Before_LM_PM := False;
2082
         ch := Getc (File);
2083
 
2084
      --  Otherwise we do raise End_Error if we are at the end of file now
2085
 
2086
      else
2087
         ch := Getc (File);
2088
 
2089
         if ch = EOF then
2090
            raise End_Error;
2091
         end if;
2092
      end if;
2093
 
2094
      --  Now we can just rumble along to the next page mark, or to the
2095
      --  end of file, if that comes first. The latter case happens when
2096
      --  the page mark is implied at the end of file.
2097
 
2098
      loop
2099
         exit when ch = EOF
2100
           or else (ch = PM and then File.Is_Regular_File);
2101
         ch := Getc (File);
2102
      end loop;
2103
 
2104
      File.Page := File.Page + 1;
2105
      File.Line := 1;
2106
      File.Col  := 1;
2107
      File.Before_Upper_Half_Character := False;
2108
   end Skip_Page;
2109
 
2110
   procedure Skip_Page is
2111
   begin
2112
      Skip_Page (Current_In);
2113
   end Skip_Page;
2114
 
2115
   --------------------
2116
   -- Standard_Error --
2117
   --------------------
2118
 
2119
   function Standard_Error return File_Type is
2120
   begin
2121
      return Standard_Err;
2122
   end Standard_Error;
2123
 
2124
   function Standard_Error return File_Access is
2125
   begin
2126
      return Standard_Err'Access;
2127
   end Standard_Error;
2128
 
2129
   --------------------
2130
   -- Standard_Input --
2131
   --------------------
2132
 
2133
   function Standard_Input return File_Type is
2134
   begin
2135
      return Standard_In;
2136
   end Standard_Input;
2137
 
2138
   function Standard_Input return File_Access is
2139
   begin
2140
      return Standard_In'Access;
2141
   end Standard_Input;
2142
 
2143
   ---------------------
2144
   -- Standard_Output --
2145
   ---------------------
2146
 
2147
   function Standard_Output return File_Type is
2148
   begin
2149
      return Standard_Out;
2150
   end Standard_Output;
2151
 
2152
   function Standard_Output return File_Access is
2153
   begin
2154
      return Standard_Out'Access;
2155
   end Standard_Output;
2156
 
2157
   --------------------
2158
   -- Terminate_Line --
2159
   --------------------
2160
 
2161
   procedure Terminate_Line (File : File_Type) is
2162
   begin
2163
      FIO.Check_File_Open (AP (File));
2164
 
2165
      --  For file other than In_File, test for needing to terminate last line
2166
 
2167
      if Mode (File) /= In_File then
2168
 
2169
         --  If not at start of line definition need new line
2170
 
2171
         if File.Col /= 1 then
2172
            New_Line (File);
2173
 
2174
         --  For files other than standard error and standard output, we
2175
         --  make sure that an empty file has a single line feed, so that
2176
         --  it is properly formatted. We avoid this for the standard files
2177
         --  because it is too much of a nuisance to have these odd line
2178
         --  feeds when nothing has been written to the file.
2179
 
2180
         --  We also avoid this for files opened in append mode, in
2181
         --  accordance with (RM A.8.2(10))
2182
 
2183
         elsif (File /= Standard_Err and then File /= Standard_Out)
2184
           and then (File.Line = 1 and then File.Page = 1)
2185
           and then Mode (File) = Out_File
2186
         then
2187
            New_Line (File);
2188
         end if;
2189
      end if;
2190
   end Terminate_Line;
2191
 
2192
   ------------
2193
   -- Ungetc --
2194
   ------------
2195
 
2196
   procedure Ungetc (ch : int; File : File_Type) is
2197
   begin
2198
      if ch /= EOF then
2199
         if ungetc (ch, File.Stream) = EOF then
2200
            raise Device_Error;
2201
         end if;
2202
      end if;
2203
   end Ungetc;
2204
 
2205
   -----------
2206
   -- Write --
2207
   -----------
2208
 
2209
   --  This is the primitive Stream Write routine, used when a Text_IO file
2210
   --  is treated directly as a stream using Text_IO.Streams.Stream.
2211
 
2212
   procedure Write
2213
     (File : in out Text_AFCB;
2214
      Item : Stream_Element_Array)
2215
   is
2216
      pragma Warnings (Off, File);
2217
      --  Because in this implementation we don't need IN OUT, we only read
2218
 
2219
      function Has_Translated_Characters return Boolean;
2220
      --  return True if Item array contains a character which will be
2221
      --  translated under the text file mode. There is only one such
2222
      --  character under DOS based systems which is character 10.
2223
 
2224
      text_translation_required : Boolean;
2225
      for text_translation_required'Size use Character'Size;
2226
      pragma Import (C, text_translation_required,
2227
                     "__gnat_text_translation_required");
2228
 
2229
      Siz : constant size_t := Item'Length;
2230
 
2231
      -------------------------------
2232
      -- Has_Translated_Characters --
2233
      -------------------------------
2234
 
2235
      function Has_Translated_Characters return Boolean is
2236
      begin
2237
         for K in Item'Range loop
2238
            if Item (K) = 10 then
2239
               return True;
2240
            end if;
2241
         end loop;
2242
         return False;
2243
      end Has_Translated_Characters;
2244
 
2245
      Needs_Binary_Write : constant Boolean :=
2246
                             text_translation_required
2247
                               and then Has_Translated_Characters;
2248
 
2249
   --  Start of processing for Write
2250
 
2251
   begin
2252
      if File.Mode = FCB.In_File then
2253
         raise Mode_Error;
2254
      end if;
2255
 
2256
      --  Now we do the write. Since this is a text file, it is normally in
2257
      --  text mode, but stream data must be written in binary mode, so we
2258
      --  temporarily set binary mode for the write, resetting it after. This
2259
      --  is done only if needed (i.e. there is some characters in Item which
2260
      --  needs to be written using the binary mode).
2261
      --  These calls have no effect in a system (like Unix) where there is
2262
      --  no distinction between text and binary files.
2263
 
2264
      --  Since the character translation is done at the time the buffer is
2265
      --  written (this is true under Windows) we first flush current buffer
2266
      --  with text mode if needed.
2267
 
2268
      if Needs_Binary_Write then
2269
         if fflush (File.Stream) = -1 then
2270
            raise Device_Error;
2271
         end if;
2272
 
2273
         set_binary_mode (fileno (File.Stream));
2274
      end if;
2275
 
2276
      if fwrite (Item'Address, 1, Siz, File.Stream) /= Siz then
2277
         raise Device_Error;
2278
      end if;
2279
 
2280
      --  At this point we need to flush the buffer using the binary mode then
2281
      --  we reset to text mode.
2282
 
2283
      if Needs_Binary_Write then
2284
         if fflush (File.Stream) = -1 then
2285
            raise Device_Error;
2286
         end if;
2287
 
2288
         set_text_mode (fileno (File.Stream));
2289
      end if;
2290
   end Write;
2291
 
2292
begin
2293
   --  Initialize Standard Files
2294
 
2295
   for J in WC_Encoding_Method loop
2296
      if WC_Encoding = WC_Encoding_Letters (J) then
2297
         Default_WCEM := J;
2298
      end if;
2299
   end loop;
2300
 
2301
   Initialize_Standard_Files;
2302
 
2303
   FIO.Chain_File (AP (Standard_In));
2304
   FIO.Chain_File (AP (Standard_Out));
2305
   FIO.Chain_File (AP (Standard_Err));
2306
 
2307
end Ada.Text_IO;

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