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1 706 jeremybenn
------------------------------------------------------------------------------
2
--                                                                          --
3
--                         GNAT COMPILER COMPONENTS                         --
4
--                                                                          --
5
--                                G P R E P                                 --
6
--                                                                          --
7
--                                 B o d y                                  --
8
--                                                                          --
9
--          Copyright (C) 2002-2011, 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.  See the GNU General Public License --
17
-- for  more details.  You should have  received  a copy of the GNU General --
18
-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
19
-- http://www.gnu.org/licenses for a complete copy of the license.          --
20
--                                                                          --
21
-- GNAT was originally developed  by the GNAT team at  New York University. --
22
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
23
--                                                                          --
24
------------------------------------------------------------------------------
25
 
26
with Csets;
27
with Err_Vars; use Err_Vars;
28
with Errutil;
29
with Namet;    use Namet;
30
with Opt;
31
with Osint;    use Osint;
32
with Output;   use Output;
33
with Prep;     use Prep;
34
with Scng;
35
with Sinput.C;
36
with Snames;
37
with Stringt;  use Stringt;
38
with Switch;   use Switch;
39
with Types;    use Types;
40
 
41
with Ada.Text_IO;     use Ada.Text_IO;
42
 
43
with GNAT.Case_Util;            use GNAT.Case_Util;
44
with GNAT.Command_Line;
45
with GNAT.Directory_Operations; use GNAT.Directory_Operations;
46
 
47
with System.OS_Lib; use System.OS_Lib;
48
 
49
package body GPrep is
50
 
51
   Copyright_Displayed : Boolean := False;
52
   --  Used to prevent multiple displays of the copyright notice
53
 
54
   ------------------------
55
   -- Argument Line Data --
56
   ------------------------
57
 
58
   Unix_Line_Terminators : Boolean := False;
59
   --  Set to True with option -T
60
 
61
   type String_Array is array (Boolean) of String_Access;
62
   Yes_No : constant String_Array :=
63
     (False => new String'("YES"),
64
      True  => new String'("NO"));
65
 
66
   Infile_Name  : Name_Id := No_Name;
67
   Outfile_Name : Name_Id := No_Name;
68
   Deffile_Name : Name_Id := No_Name;
69
 
70
   Output_Directory : Name_Id := No_Name;
71
   --  Used when the specified output is an existing directory
72
 
73
   Input_Directory : Name_Id := No_Name;
74
   --  Used when the specified input and output are existing directories
75
 
76
   Source_Ref_Pragma : Boolean := False;
77
   --  Record command line options (set if -r switch set)
78
 
79
   Text_Outfile : aliased Ada.Text_IO.File_Type;
80
   Outfile      : constant File_Access := Text_Outfile'Access;
81
 
82
   File_Name_Buffer_Initial_Size : constant := 50;
83
   File_Name_Buffer : String_Access :=
84
                        new String (1 .. File_Name_Buffer_Initial_Size);
85
   --  A buffer to build output file names from input file names
86
 
87
   -----------------
88
   -- Subprograms --
89
   -----------------
90
 
91
   procedure Display_Copyright;
92
   --  Display the copyright notice
93
 
94
   procedure Post_Scan;
95
   --  Null procedure, needed by instantiation of Scng below
96
 
97
   package Scanner is new Scng
98
     (Post_Scan,
99
      Errutil.Error_Msg,
100
      Errutil.Error_Msg_S,
101
      Errutil.Error_Msg_SC,
102
      Errutil.Error_Msg_SP,
103
      Errutil.Style);
104
   --  The scanner for the preprocessor
105
 
106
   function Is_ASCII_Letter (C : Character) return Boolean;
107
   --  True if C is in 'a' .. 'z' or in 'A' .. 'Z'
108
 
109
   procedure Double_File_Name_Buffer;
110
   --  Double the size of the file name buffer
111
 
112
   procedure Preprocess_Infile_Name;
113
   --  When the specified output is a directory, preprocess the infile name
114
   --  for symbol substitution, to get the output file name.
115
 
116
   procedure Process_Files;
117
   --  Process the single input file or all the files in the directory tree
118
   --  rooted at the input directory.
119
 
120
   procedure Process_Command_Line_Symbol_Definition (S : String);
121
   --  Process a -D switch on the command line
122
 
123
   procedure Put_Char_To_Outfile (C : Character);
124
   --  Output one character to the output file. Used to initialize the
125
   --  preprocessor.
126
 
127
   procedure New_EOL_To_Outfile;
128
   --  Output a new line to the output file. Used to initialize the
129
   --  preprocessor.
130
 
131
   procedure Scan_Command_Line;
132
   --  Scan the switches and the file names
133
 
134
   procedure Usage;
135
   --  Display the usage
136
 
137
   -----------------------
138
   -- Display_Copyright --
139
   -----------------------
140
 
141
   procedure Display_Copyright is
142
   begin
143
      if not Copyright_Displayed then
144
         Display_Version ("GNAT Preprocessor", "1996");
145
         Copyright_Displayed := True;
146
      end if;
147
   end Display_Copyright;
148
 
149
   -----------------------------
150
   -- Double_File_Name_Buffer --
151
   -----------------------------
152
 
153
   procedure Double_File_Name_Buffer is
154
      New_Buffer : constant String_Access :=
155
                     new String (1 .. 2 * File_Name_Buffer'Length);
156
   begin
157
      New_Buffer (File_Name_Buffer'Range) := File_Name_Buffer.all;
158
      Free (File_Name_Buffer);
159
      File_Name_Buffer := New_Buffer;
160
   end Double_File_Name_Buffer;
161
 
162
   --------------
163
   -- Gnatprep --
164
   --------------
165
 
166
   procedure Gnatprep is
167
   begin
168
      --  Do some initializations (order is important here!)
169
 
170
      Csets.Initialize;
171
      Snames.Initialize;
172
      Stringt.Initialize;
173
      Prep.Initialize;
174
 
175
      --  Initialize the preprocessor
176
 
177
      Prep.Setup_Hooks
178
        (Error_Msg         => Errutil.Error_Msg'Access,
179
         Scan              => Scanner.Scan'Access,
180
         Set_Ignore_Errors => Errutil.Set_Ignore_Errors'Access,
181
         Put_Char          => Put_Char_To_Outfile'Access,
182
         New_EOL           => New_EOL_To_Outfile'Access);
183
 
184
      --  Set the scanner characteristics for the preprocessor
185
 
186
      Scanner.Set_Special_Character ('#');
187
      Scanner.Set_Special_Character ('$');
188
      Scanner.Set_End_Of_Line_As_Token (True);
189
 
190
      --  Initialize the mapping table of symbols to values
191
 
192
      Prep.Symbol_Table.Init (Prep.Mapping);
193
 
194
      --  Parse the switches and arguments
195
 
196
      Scan_Command_Line;
197
 
198
      if Opt.Verbose_Mode then
199
         Display_Copyright;
200
      end if;
201
 
202
      --  Test we had all the arguments needed
203
 
204
      if Infile_Name = No_Name then
205
 
206
         --  No input file specified, just output the usage and exit
207
 
208
         Usage;
209
         return;
210
 
211
      elsif Outfile_Name = No_Name then
212
 
213
         --  No output file specified, just output the usage and exit
214
 
215
         Usage;
216
         return;
217
      end if;
218
 
219
      --  If a pragma Source_File_Name, we need to keep line numbers. So, if
220
      --  the deleted lines are not put as comment, we must output them as
221
      --  blank lines.
222
 
223
      if Source_Ref_Pragma and (not Opt.Comment_Deleted_Lines) then
224
         Opt.Blank_Deleted_Lines := True;
225
      end if;
226
 
227
      --  If we have a definition file, parse it
228
 
229
      if Deffile_Name /= No_Name then
230
         declare
231
            Deffile : Source_File_Index;
232
 
233
         begin
234
            Errutil.Initialize;
235
            Deffile := Sinput.C.Load_File (Get_Name_String (Deffile_Name));
236
 
237
            --  Set Main_Source_File to the definition file for the benefit of
238
            --  Errutil.Finalize.
239
 
240
            Sinput.Main_Source_File := Deffile;
241
 
242
            if Deffile = No_Source_File then
243
               Fail ("unable to find definition file """
244
                     & Get_Name_String (Deffile_Name)
245
                     & """");
246
            end if;
247
 
248
            Scanner.Initialize_Scanner (Deffile);
249
 
250
            Prep.Parse_Def_File;
251
         end;
252
      end if;
253
 
254
      --  If there are errors in the definition file, output them and exit
255
 
256
      if Total_Errors_Detected > 0 then
257
         Errutil.Finalize (Source_Type => "definition");
258
         Fail ("errors in definition file """
259
               & Get_Name_String (Deffile_Name)
260
               & """");
261
      end if;
262
 
263
      --  If -s switch was specified, print a sorted list of symbol names and
264
      --  values, if any.
265
 
266
      if Opt.List_Preprocessing_Symbols then
267
         Prep.List_Symbols (Foreword => "");
268
      end if;
269
 
270
      Output_Directory := No_Name;
271
      Input_Directory  := No_Name;
272
 
273
      --  Check if the specified output is an existing directory
274
 
275
      if Is_Directory (Get_Name_String (Outfile_Name)) then
276
         Output_Directory := Outfile_Name;
277
 
278
         --  As the output is an existing directory, check if the input too
279
         --  is a directory.
280
 
281
         if Is_Directory (Get_Name_String (Infile_Name)) then
282
            Input_Directory := Infile_Name;
283
         end if;
284
      end if;
285
 
286
      --  And process the single input or the files in the directory tree
287
      --  rooted at the input directory.
288
 
289
      Process_Files;
290
   end Gnatprep;
291
 
292
   ---------------------
293
   -- Is_ASCII_Letter --
294
   ---------------------
295
 
296
   function Is_ASCII_Letter (C : Character) return Boolean is
297
   begin
298
      return C in 'A' .. 'Z' or else C in 'a' .. 'z';
299
   end Is_ASCII_Letter;
300
 
301
   ------------------------
302
   -- New_EOL_To_Outfile --
303
   ------------------------
304
 
305
   procedure New_EOL_To_Outfile is
306
   begin
307
      New_Line (Outfile.all);
308
   end New_EOL_To_Outfile;
309
 
310
   ---------------
311
   -- Post_Scan --
312
   ---------------
313
 
314
   procedure Post_Scan is
315
   begin
316
      null;
317
   end Post_Scan;
318
 
319
   ----------------------------
320
   -- Preprocess_Infile_Name --
321
   ----------------------------
322
 
323
   procedure Preprocess_Infile_Name is
324
      Len    : Natural;
325
      First  : Positive;
326
      Last   : Natural;
327
      Symbol : Name_Id;
328
      Data   : Symbol_Data;
329
 
330
   begin
331
      --  Initialize the buffer with the name of the input file
332
 
333
      Get_Name_String (Infile_Name);
334
      Len := Name_Len;
335
 
336
      while File_Name_Buffer'Length < Len loop
337
         Double_File_Name_Buffer;
338
      end loop;
339
 
340
      File_Name_Buffer (1 .. Len) := Name_Buffer (1 .. Len);
341
 
342
      --  Look for possible symbols in the file name
343
 
344
      First := 1;
345
      while First < Len loop
346
 
347
         --  A symbol starts with a dollar sign followed by a letter
348
 
349
         if File_Name_Buffer (First) = '$' and then
350
           Is_ASCII_Letter (File_Name_Buffer (First + 1))
351
         then
352
            Last := First + 1;
353
 
354
            --  Find the last letter of the symbol
355
 
356
            while Last < Len and then
357
               Is_ASCII_Letter (File_Name_Buffer (Last + 1))
358
            loop
359
               Last := Last + 1;
360
            end loop;
361
 
362
            --  Get the symbol name id
363
 
364
            Name_Len := Last - First;
365
            Name_Buffer (1 .. Name_Len) :=
366
              File_Name_Buffer (First + 1 .. Last);
367
            To_Lower (Name_Buffer (1 .. Name_Len));
368
            Symbol := Name_Find;
369
 
370
            --  And look for this symbol name in the symbol table
371
 
372
            for Index in 1 .. Symbol_Table.Last (Mapping) loop
373
               Data := Mapping.Table (Index);
374
 
375
               if Data.Symbol = Symbol then
376
 
377
                  --  We found the symbol. If its value is not a string,
378
                  --  replace the symbol in the file name with the value of
379
                  --  the symbol.
380
 
381
                  if not Data.Is_A_String then
382
                     String_To_Name_Buffer (Data.Value);
383
 
384
                     declare
385
                        Sym_Len : constant Positive := Last - First + 1;
386
                        Offset  : constant Integer := Name_Len - Sym_Len;
387
                        New_Len : constant Natural := Len + Offset;
388
 
389
                     begin
390
                        while New_Len > File_Name_Buffer'Length loop
391
                           Double_File_Name_Buffer;
392
                        end loop;
393
 
394
                        File_Name_Buffer (Last + 1 + Offset .. New_Len) :=
395
                          File_Name_Buffer (Last + 1 .. Len);
396
                        Len := New_Len;
397
                        Last := Last + Offset;
398
                        File_Name_Buffer (First .. Last) :=
399
                          Name_Buffer (1 .. Name_Len);
400
                     end;
401
                  end if;
402
 
403
                  exit;
404
               end if;
405
            end loop;
406
 
407
            --  Skip over the symbol name or its value: we are not checking
408
            --  for another symbol name in the value.
409
 
410
            First := Last + 1;
411
 
412
         else
413
            First := First + 1;
414
         end if;
415
      end loop;
416
 
417
      --  We now have the output file name in the buffer. Get the output
418
      --  path and put it in Outfile_Name.
419
 
420
      Get_Name_String (Output_Directory);
421
      Add_Char_To_Name_Buffer (Directory_Separator);
422
      Add_Str_To_Name_Buffer (File_Name_Buffer (1 .. Len));
423
      Outfile_Name := Name_Find;
424
   end Preprocess_Infile_Name;
425
 
426
   --------------------------------------------
427
   -- Process_Command_Line_Symbol_Definition --
428
   --------------------------------------------
429
 
430
   procedure Process_Command_Line_Symbol_Definition (S : String) is
431
      Data   : Symbol_Data;
432
      Symbol : Symbol_Id;
433
 
434
   begin
435
      --  Check the symbol definition and get the symbol and its value.
436
      --  Fail if symbol definition is illegal.
437
 
438
      Check_Command_Line_Symbol_Definition (S, Data);
439
 
440
      Symbol := Index_Of (Data.Symbol);
441
 
442
      --  If symbol does not already exist, create a new entry in the mapping
443
      --  table.
444
 
445
      if Symbol = No_Symbol then
446
         Symbol_Table.Increment_Last (Mapping);
447
         Symbol := Symbol_Table.Last (Mapping);
448
      end if;
449
 
450
      Mapping.Table (Symbol) := Data;
451
   end Process_Command_Line_Symbol_Definition;
452
 
453
   -------------------
454
   -- Process_Files --
455
   -------------------
456
 
457
   procedure Process_Files is
458
 
459
      procedure Process_One_File;
460
      --  Process input file Infile_Name and put the result in file
461
      --  Outfile_Name.
462
 
463
      procedure Recursive_Process (In_Dir : String; Out_Dir : String);
464
      --  Process recursively files in In_Dir. Results go to Out_Dir
465
 
466
      ----------------------
467
      -- Process_One_File --
468
      ----------------------
469
 
470
      procedure Process_One_File is
471
         Infile : Source_File_Index;
472
 
473
         Modified : Boolean;
474
         pragma Warnings (Off, Modified);
475
 
476
      begin
477
         --  Create the output file (fails if this does not work)
478
 
479
         begin
480
            Create
481
              (File => Text_Outfile,
482
               Mode => Out_File,
483
               Name => Get_Name_String (Outfile_Name),
484
               Form => "Text_Translation=" &
485
                       Yes_No (Unix_Line_Terminators).all);
486
 
487
         exception
488
            when others =>
489
               Fail
490
                 ("unable to create output file """
491
                  & Get_Name_String (Outfile_Name)
492
                  & """");
493
         end;
494
 
495
         --  Load the input file
496
 
497
         Infile := Sinput.C.Load_File (Get_Name_String (Infile_Name));
498
 
499
         if Infile = No_Source_File then
500
            Fail ("unable to find input file """
501
                  & Get_Name_String (Infile_Name)
502
                  & """");
503
         end if;
504
 
505
         --  Set Main_Source_File to the input file for the benefit of
506
         --  Errutil.Finalize.
507
 
508
         Sinput.Main_Source_File := Infile;
509
 
510
         Scanner.Initialize_Scanner (Infile);
511
 
512
         --  Output the pragma Source_Reference if asked to
513
 
514
         if Source_Ref_Pragma then
515
            Put_Line
516
              (Outfile.all,
517
               "pragma Source_Reference (1, """ &
518
                 Get_Name_String (Sinput.Full_File_Name (Infile)) & """);");
519
         end if;
520
 
521
         --  Preprocess the input file
522
 
523
         Prep.Preprocess (Modified);
524
 
525
         --  In verbose mode, if there is no error, report it
526
 
527
         if Opt.Verbose_Mode and then Err_Vars.Total_Errors_Detected = 0 then
528
            Errutil.Finalize (Source_Type => "input");
529
         end if;
530
 
531
         --  If we had some errors, delete the output file, and report them
532
 
533
         if Err_Vars.Total_Errors_Detected > 0 then
534
            if Outfile /= Standard_Output then
535
               Delete (Text_Outfile);
536
            end if;
537
 
538
            Errutil.Finalize (Source_Type => "input");
539
 
540
            OS_Exit (0);
541
 
542
         --  Otherwise, close the output file, and we are done
543
 
544
         elsif Outfile /= Standard_Output then
545
            Close (Text_Outfile);
546
         end if;
547
      end Process_One_File;
548
 
549
      -----------------------
550
      -- Recursive_Process --
551
      -----------------------
552
 
553
      procedure Recursive_Process (In_Dir : String; Out_Dir : String) is
554
         Dir_In : Dir_Type;
555
         Name : String (1 .. 255);
556
         Last : Natural;
557
         In_Dir_Name  : Name_Id;
558
         Out_Dir_Name : Name_Id;
559
 
560
         procedure Set_Directory_Names;
561
         --  Establish or reestablish the current input and output directories
562
 
563
         -------------------------
564
         -- Set_Directory_Names --
565
         -------------------------
566
 
567
         procedure Set_Directory_Names is
568
         begin
569
            Input_Directory := In_Dir_Name;
570
            Output_Directory := Out_Dir_Name;
571
         end Set_Directory_Names;
572
 
573
      --  Start of processing for Recursive_Process
574
 
575
      begin
576
         --  Open the current input directory
577
 
578
         begin
579
            Open (Dir_In, In_Dir);
580
 
581
         exception
582
            when Directory_Error =>
583
               Fail ("could not read directory " & In_Dir);
584
         end;
585
 
586
         --  Set the new input and output directory names
587
 
588
         Name_Len := In_Dir'Length;
589
         Name_Buffer (1 .. Name_Len) := In_Dir;
590
         In_Dir_Name := Name_Find;
591
         Name_Len := Out_Dir'Length;
592
         Name_Buffer (1 .. Name_Len) := Out_Dir;
593
         Out_Dir_Name := Name_Find;
594
 
595
         Set_Directory_Names;
596
 
597
         --  Traverse the input directory
598
         loop
599
            Read (Dir_In, Name, Last);
600
            exit when Last = 0;
601
 
602
            if Name (1 .. Last) /= "." and then Name (1 .. Last) /= ".." then
603
               declare
604
                  Input : constant String :=
605
                            In_Dir & Directory_Separator & Name (1 .. Last);
606
                  Output : constant String :=
607
                             Out_Dir & Directory_Separator & Name (1 .. Last);
608
 
609
               begin
610
                  --  If input is an ordinary file, process it
611
 
612
                  if Is_Regular_File (Input) then
613
                     --  First get the output file name
614
 
615
                     Name_Len := Last;
616
                     Name_Buffer (1 .. Name_Len) := Name (1 .. Last);
617
                     Infile_Name := Name_Find;
618
                     Preprocess_Infile_Name;
619
 
620
                     --  Set the input file name and process the file
621
 
622
                     Name_Len := Input'Length;
623
                     Name_Buffer (1 .. Name_Len) := Input;
624
                     Infile_Name := Name_Find;
625
                     Process_One_File;
626
 
627
                  elsif Is_Directory (Input) then
628
                     --  Input is a directory. If the corresponding output
629
                     --  directory does not already exist, create it.
630
 
631
                     if not Is_Directory (Output) then
632
                        begin
633
                           Make_Dir (Dir_Name => Output);
634
 
635
                        exception
636
                           when Directory_Error =>
637
                              Fail ("could not create directory """
638
                                    & Output
639
                                    & """");
640
                        end;
641
                     end if;
642
 
643
                     --  And process this new input directory
644
 
645
                     Recursive_Process (Input, Output);
646
 
647
                     --  Reestablish the input and output directory names
648
                     --  that have been modified by the recursive call.
649
 
650
                     Set_Directory_Names;
651
                  end if;
652
               end;
653
            end if;
654
         end loop;
655
      end Recursive_Process;
656
 
657
   --  Start of processing for Process_Files
658
 
659
   begin
660
      if Output_Directory = No_Name then
661
 
662
         --  If the output is not a directory, fail if the input is
663
         --  an existing directory, to avoid possible problems.
664
 
665
         if Is_Directory (Get_Name_String (Infile_Name)) then
666
            Fail ("input file """ & Get_Name_String (Infile_Name) &
667
                  """ is a directory");
668
         end if;
669
 
670
         --  Just process the single input file
671
 
672
         Process_One_File;
673
 
674
      elsif Input_Directory = No_Name then
675
 
676
         --  Get the output file name from the input file name, and process
677
         --  the single input file.
678
 
679
         Preprocess_Infile_Name;
680
         Process_One_File;
681
 
682
      else
683
         --  Recursively process files in the directory tree rooted at the
684
         --  input directory.
685
 
686
         Recursive_Process
687
           (In_Dir => Get_Name_String (Input_Directory),
688
            Out_Dir => Get_Name_String (Output_Directory));
689
      end if;
690
   end Process_Files;
691
 
692
   -------------------------
693
   -- Put_Char_To_Outfile --
694
   -------------------------
695
 
696
   procedure Put_Char_To_Outfile (C : Character) is
697
   begin
698
      Put (Outfile.all, C);
699
   end Put_Char_To_Outfile;
700
 
701
   -----------------------
702
   -- Scan_Command_Line --
703
   -----------------------
704
 
705
   procedure Scan_Command_Line is
706
      Switch : Character;
707
 
708
      procedure Check_Version_And_Help is new Check_Version_And_Help_G (Usage);
709
 
710
      --  Start of processing for Scan_Command_Line
711
 
712
   begin
713
      --  First check for --version or --help
714
 
715
      Check_Version_And_Help ("GNATPREP", "1996");
716
 
717
      --  Now scan the other switches
718
 
719
      GNAT.Command_Line.Initialize_Option_Scan;
720
 
721
      loop
722
         begin
723
            Switch := GNAT.Command_Line.Getopt ("D: b c C r s T u v");
724
 
725
            case Switch is
726
 
727
               when ASCII.NUL =>
728
                  exit;
729
 
730
               when 'D' =>
731
                  Process_Command_Line_Symbol_Definition
732
                    (S => GNAT.Command_Line.Parameter);
733
 
734
               when 'b' =>
735
                  Opt.Blank_Deleted_Lines := True;
736
 
737
               when 'c' =>
738
                  Opt.Comment_Deleted_Lines := True;
739
 
740
               when 'C' =>
741
                  Opt.Replace_In_Comments := True;
742
 
743
               when 'r' =>
744
                  Source_Ref_Pragma := True;
745
 
746
               when 's' =>
747
                  Opt.List_Preprocessing_Symbols := True;
748
 
749
               when 'T' =>
750
                  Unix_Line_Terminators := True;
751
 
752
               when 'u' =>
753
                  Opt.Undefined_Symbols_Are_False := True;
754
 
755
               when 'v' =>
756
                  Opt.Verbose_Mode := True;
757
 
758
               when others =>
759
                  Fail ("Invalid Switch: -" & Switch);
760
            end case;
761
 
762
         exception
763
            when GNAT.Command_Line.Invalid_Switch =>
764
               Write_Str ("Invalid Switch: -");
765
               Write_Line (GNAT.Command_Line.Full_Switch);
766
               Usage;
767
               OS_Exit (1);
768
         end;
769
      end loop;
770
 
771
      --  Get the file names
772
 
773
      loop
774
         declare
775
            S : constant String := GNAT.Command_Line.Get_Argument;
776
 
777
         begin
778
            exit when S'Length = 0;
779
 
780
            Name_Len := S'Length;
781
            Name_Buffer (1 .. Name_Len) := S;
782
 
783
            if Infile_Name = No_Name then
784
               Infile_Name := Name_Find;
785
            elsif Outfile_Name = No_Name then
786
               Outfile_Name := Name_Find;
787
            elsif Deffile_Name = No_Name then
788
               Deffile_Name := Name_Find;
789
            else
790
               Fail ("too many arguments specified");
791
            end if;
792
         end;
793
      end loop;
794
   end Scan_Command_Line;
795
 
796
   -----------
797
   -- Usage --
798
   -----------
799
 
800
   procedure Usage is
801
   begin
802
      Display_Copyright;
803
      Write_Line ("Usage: gnatprep [-bcrsuv] [-Dsymbol=value] " &
804
                    "infile outfile [deffile]");
805
      Write_Eol;
806
      Write_Line ("  infile     Name of the input file");
807
      Write_Line ("  outfile    Name of the output file");
808
      Write_Line ("  deffile    Name of the definition file");
809
      Write_Eol;
810
      Write_Line ("gnatprep switches:");
811
      Display_Usage_Version_And_Help;
812
      Write_Line ("   -b  Replace preprocessor lines by blank lines");
813
      Write_Line ("   -c  Keep preprocessor lines as comments");
814
      Write_Line ("   -C  Do symbol replacements within comments");
815
      Write_Line ("   -D  Associate symbol with value");
816
      Write_Line ("   -r  Generate Source_Reference pragma");
817
      Write_Line ("   -s  Print a sorted list of symbol names and values");
818
      Write_Line ("   -T  Use LF as line terminators");
819
      Write_Line ("   -u  Treat undefined symbols as FALSE");
820
      Write_Line ("   -v  Verbose mode");
821
      Write_Eol;
822
   end Usage;
823
 
824
end GPrep;

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