gcc/ada/gprep.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                                G P R E P                                 --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2002-2007, 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    Infile_Name  : Name_Id := No_Name;
  59    Outfile_Name : Name_Id := No_Name;
  60    Deffile_Name : Name_Id := No_Name;
  61
  62    Output_Directory : Name_Id := No_Name;
  63    --  Used when the specified output is an existing directory
  64
  65    Input_Directory : Name_Id := No_Name;
  66    --  Used when the specified input and output are existing directories
  67
  68    Source_Ref_Pragma : Boolean := False;
  69    --  Record command line options (set if -r switch set)
  70
  71    Text_Outfile : aliased Ada.Text_IO.File_Type;
  72    Outfile      : constant File_Access := Text_Outfile'Access;
  73
  74    File_Name_Buffer_Initial_Size : constant := 50;
  75    File_Name_Buffer : String_Access :=
  76                         new String (1 .. File_Name_Buffer_Initial_Size);
  77    --  A buffer to build output file names from input file names
  78
  79    -----------------
  80    -- Subprograms --
  81    -----------------
  82
  83    procedure Display_Copyright;
  84    --  Display the copyright notice
  85
  86    procedure Obsolescent_Check (S : Source_Ptr);
  87    --  Null procedure, needed by instantiation of Scng below
  88
  89    procedure Post_Scan;
  90    --  Null procedure, needed by instantiation of Scng below
  91
  92    package Scanner is new Scng
  93      (Post_Scan,
  94       Errutil.Error_Msg,
  95       Errutil.Error_Msg_S,
  96       Errutil.Error_Msg_SC,
  97       Errutil.Error_Msg_SP,
  98       Obsolescent_Check,
  99       Errutil.Style);
 100    --  The scanner for the preprocessor
 101
 102    function Is_ASCII_Letter (C : Character) return Boolean;
 103    --  True if C is in 'a' .. 'z' or in 'A' .. 'Z'
 104
 105    procedure Double_File_Name_Buffer;
 106    --  Double the size of the file name buffer
 107
 108    procedure Preprocess_Infile_Name;
 109    --  When the specified output is a directory, preprocess the infile name
 110    --  for symbol substitution, to get the output file name.
 111
 112    procedure Process_Files;
 113    --  Process the single input file or all the files in the directory tree
 114    --  rooted at the input directory.
 115
 116    procedure Process_Command_Line_Symbol_Definition (S : String);
 117    --  Process a -D switch on the command line
 118
 119    procedure Put_Char_To_Outfile (C : Character);
 120    --  Output one character to the output file. Used to initialize the
 121    --  preprocessor.
 122
 123    procedure New_EOL_To_Outfile;
 124    --  Output a new line to the output file. Used to initialize the
 125    --  preprocessor.
 126
 127    procedure Scan_Command_Line;
 128    --  Scan the switches and the file names
 129
 130    procedure Usage;
 131    --  Display the usage
 132
 133    -----------------------
 134    -- Display_Copyright --
 135    -----------------------
 136
 137    procedure Display_Copyright is
 138    begin
 139       if not Copyright_Displayed then
 140          Display_Version ("GNAT Preprocessor", "1996");
 141          Copyright_Displayed := True;
 142       end if;
 143    end Display_Copyright;
 144
 145    -----------------------------
 146    -- Double_File_Name_Buffer --
 147    -----------------------------
 148
 149    procedure Double_File_Name_Buffer is
 150       New_Buffer : constant String_Access :=
 151                      new String (1 .. 2 * File_Name_Buffer'Length);
 152    begin
 153       New_Buffer (File_Name_Buffer'Range) := File_Name_Buffer.all;
 154       Free (File_Name_Buffer);
 155       File_Name_Buffer := New_Buffer;
 156    end Double_File_Name_Buffer;
 157
 158    --------------
 159    -- Gnatprep --
 160    --------------
 161
 162    procedure Gnatprep is
 163    begin
 164       --  Do some initializations (order is important here!)
 165
 166       Csets.Initialize;
 167       Namet.Initialize;
 168       Snames.Initialize;
 169       Stringt.Initialize;
 170
 171       --  Initialize the preprocessor
 172
 173       Prep.Initialize
 174         (Error_Msg         => Errutil.Error_Msg'Access,
 175          Scan              => Scanner.Scan'Access,
 176          Set_Ignore_Errors => Errutil.Set_Ignore_Errors'Access,
 177          Put_Char          => Put_Char_To_Outfile'Access,
 178          New_EOL           => New_EOL_To_Outfile'Access);
 179
 180       --  Set the scanner characteristics for the preprocessor
 181
 182       Scanner.Set_Special_Character ('#');
 183       Scanner.Set_Special_Character ('$');
 184       Scanner.Set_End_Of_Line_As_Token (True);
 185
 186       --  Initialize the mapping table of symbols to values
 187
 188       Prep.Symbol_Table.Init (Prep.Mapping);
 189
 190       --  Parse the switches and arguments
 191
 192       Scan_Command_Line;
 193
 194       if Opt.Verbose_Mode then
 195          Display_Copyright;
 196       end if;
 197
 198       --  Test we had all the arguments needed
 199
 200       if Infile_Name = No_Name then
 201
 202          --  No input file specified, just output the usage and exit
 203
 204          Usage;
 205          return;
 206
 207       elsif Outfile_Name = No_Name then
 208
 209          --  No output file specified, just output the usage and exit
 210
 211          Usage;
 212          return;
 213       end if;
 214
 215       --  If a pragma Source_File_Name, we need to keep line numbers. So, if
 216       --  the deleted lines are not put as comment, we must output them as
 217       --  blank lines.
 218
 219       if Source_Ref_Pragma and (not Opt.Comment_Deleted_Lines) then
 220          Opt.Blank_Deleted_Lines := True;
 221       end if;
 222
 223       --  If we have a definition file, parse it
 224
 225       if Deffile_Name /= No_Name then
 226          declare
 227             Deffile : Source_File_Index;
 228
 229          begin
 230             Errutil.Initialize;
 231             Deffile := Sinput.C.Load_File (Get_Name_String (Deffile_Name));
 232
 233             --  Set Main_Source_File to the definition file for the benefit of
 234             --  Errutil.Finalize.
 235
 236             Sinput.Main_Source_File := Deffile;
 237
 238             if Deffile = No_Source_File then
 239                Fail ("unable to find definition file """,
 240                      Get_Name_String (Deffile_Name),
 241                      """");
 242             end if;
 243
 244             Scanner.Initialize_Scanner (Deffile);
 245
 246             Prep.Parse_Def_File;
 247          end;
 248       end if;
 249
 250       --  If there are errors in the definition file, output them and exit
 251
 252       if Total_Errors_Detected > 0 then
 253          Errutil.Finalize (Source_Type => "definition");
 254          Fail ("errors in definition file """,
 255                Get_Name_String (Deffile_Name), """");
 256       end if;
 257
 258       --  If -s switch was specified, print a sorted list of symbol names and
 259       --  values, if any.
 260
 261       if Opt.List_Preprocessing_Symbols then
 262          Prep.List_Symbols (Foreword => "");
 263       end if;
 264
 265       Output_Directory := No_Name;
 266       Input_Directory  := No_Name;
 267
 268       --  Check if the specified output is an existing directory
 269
 270       if Is_Directory (Get_Name_String (Outfile_Name)) then
 271          Output_Directory := Outfile_Name;
 272
 273          --  As the output is an existing directory, check if the input too
 274          --  is a directory.
 275
 276          if Is_Directory (Get_Name_String (Infile_Name)) then
 277             Input_Directory := Infile_Name;
 278          end if;
 279       end if;
 280
 281       --  And process the single input or the files in the directory tree
 282       --  rooted at the input directory.
 283
 284       Process_Files;
 285    end Gnatprep;
 286
 287    ---------------------
 288    -- Is_ASCII_Letter --
 289    ---------------------
 290
 291    function Is_ASCII_Letter (C : Character) return Boolean is
 292    begin
 293       return C in 'A' .. 'Z' or else C in 'a' .. 'z';
 294    end Is_ASCII_Letter;
 295
 296    ------------------------
 297    -- New_EOL_To_Outfile --
 298    ------------------------
 299
 300    procedure New_EOL_To_Outfile is
 301    begin
 302       New_Line (Outfile.all);
 303    end New_EOL_To_Outfile;
 304
 305    -----------------------
 306    -- Obsolescent_Check --
 307    -----------------------
 308
 309    procedure Obsolescent_Check (S : Source_Ptr) is
 310       pragma Warnings (Off, S);
 311    begin
 312       null;
 313    end Obsolescent_Check;
 314
 315    ---------------
 316    -- Post_Scan --
 317    ---------------
 318
 319    procedure Post_Scan is
 320    begin
 321       null;
 322    end Post_Scan;
 323
 324    ----------------------------
 325    -- Preprocess_Infile_Name --
 326    ----------------------------
 327
 328    procedure Preprocess_Infile_Name is
 329       Len    : Natural;
 330       First  : Positive;
 331       Last   : Natural;
 332       Symbol : Name_Id;
 333       Data   : Symbol_Data;
 334
 335    begin
 336       --  Initialize the buffer with the name of the input file
 337
 338       Get_Name_String (Infile_Name);
 339       Len := Name_Len;
 340
 341       while File_Name_Buffer'Length < Len loop
 342          Double_File_Name_Buffer;
 343       end loop;
 344
 345       File_Name_Buffer (1 .. Len) := Name_Buffer (1 .. Len);
 346
 347       --  Look for possible symbols in the file name
 348
 349       First := 1;
 350       while First < Len loop
 351
 352          --  A symbol starts with a dollar sign followed by a letter
 353
 354          if File_Name_Buffer (First) = '$' and then
 355            Is_ASCII_Letter (File_Name_Buffer (First + 1))
 356          then
 357             Last := First + 1;
 358
 359             --  Find the last letter of the symbol
 360
 361             while Last < Len and then
 362                Is_ASCII_Letter (File_Name_Buffer (Last + 1))
 363             loop
 364                Last := Last + 1;
 365             end loop;
 366
 367             --  Get the symbol name id
 368
 369             Name_Len := Last - First;
 370             Name_Buffer (1 .. Name_Len) :=
 371               File_Name_Buffer (First + 1 .. Last);
 372             To_Lower (Name_Buffer (1 .. Name_Len));
 373             Symbol := Name_Find;
 374
 375             --  And look for this symbol name in the symbol table
 376
 377             for Index in 1 .. Symbol_Table.Last (Mapping) loop
 378                Data := Mapping.Table (Index);
 379
 380                if Data.Symbol = Symbol then
 381
 382                   --  We found the symbol. If its value is not a string,
 383                   --  replace the symbol in the file name with the value of
 384                   --  the symbol.
 385
 386                   if not Data.Is_A_String then
 387                      String_To_Name_Buffer (Data.Value);
 388
 389                      declare
 390                         Sym_Len : constant Positive := Last - First + 1;
 391                         Offset  : constant Integer := Name_Len - Sym_Len;
 392                         New_Len : constant Natural := Len + Offset;
 393
 394                      begin
 395                         while New_Len > File_Name_Buffer'Length loop
 396                            Double_File_Name_Buffer;
 397                         end loop;
 398
 399                         File_Name_Buffer (Last + 1 + Offset .. New_Len) :=
 400                           File_Name_Buffer (Last + 1 .. Len);
 401                         Len := New_Len;
 402                         Last := Last + Offset;
 403                         File_Name_Buffer (First .. Last) :=
 404                           Name_Buffer (1 .. Name_Len);
 405                      end;
 406                   end if;
 407
 408                   exit;
 409                end if;
 410             end loop;
 411
 412             --  Skip over the symbol name or its value: we are not checking
 413             --  for another symbol name in the value.
 414
 415             First := Last + 1;
 416
 417          else
 418             First := First + 1;
 419          end if;
 420       end loop;
 421
 422       --  We now have the output file name in the buffer. Get the output
 423       --  path and put it in Outfile_Name.
 424
 425       Get_Name_String (Output_Directory);
 426       Add_Char_To_Name_Buffer (Directory_Separator);
 427       Add_Str_To_Name_Buffer (File_Name_Buffer (1 .. Len));
 428       Outfile_Name := Name_Find;
 429    end Preprocess_Infile_Name;
 430
 431    --------------------------------------------
 432    -- Process_Command_Line_Symbol_Definition --
 433    --------------------------------------------
 434
 435    procedure Process_Command_Line_Symbol_Definition (S : String) is
 436       Data   : Symbol_Data;
 437       Symbol : Symbol_Id;
 438
 439    begin
 440       --  Check the symbol definition and get the symbol and its value.
 441       --  Fail if symbol definition is illegal.
 442
 443       Check_Command_Line_Symbol_Definition (S, Data);
 444
 445       Symbol := Index_Of (Data.Symbol);
 446
 447       --  If symbol does not alrady exist, create a new entry in the mapping
 448       --  table.
 449
 450       if Symbol = No_Symbol then
 451          Symbol_Table.Increment_Last (Mapping);
 452          Symbol := Symbol_Table.Last (Mapping);
 453       end if;
 454
 455       Mapping.Table (Symbol) := Data;
 456    end Process_Command_Line_Symbol_Definition;
 457
 458    -------------------
 459    -- Process_Files --
 460    -------------------
 461
 462    procedure Process_Files is
 463
 464       procedure Process_One_File;
 465       --  Process input file Infile_Name and put the result in file
 466       --  Outfile_Name.
 467
 468       procedure Recursive_Process (In_Dir : String; Out_Dir : String);
 469       --  Process recursively files in In_Dir. Results go to Out_Dir
 470
 471       ----------------------
 472       -- Process_One_File --
 473       ----------------------
 474
 475       procedure Process_One_File is
 476          Infile : Source_File_Index;
 477
 478       begin
 479          --  Create the output file (fails if this does not work)
 480
 481          begin
 482             Create (Text_Outfile, Out_File, Get_Name_String (Outfile_Name));
 483
 484          exception
 485             when others =>
 486                Fail
 487                  ("unable to create output file """,
 488                   Get_Name_String (Outfile_Name), """");
 489          end;
 490
 491          --  Load the input file
 492
 493          Infile := Sinput.C.Load_File (Get_Name_String (Infile_Name));
 494
 495          if Infile = No_Source_File then
 496             Fail ("unable to find input file """,
 497                   Get_Name_String (Infile_Name), """");
 498          end if;
 499
 500          --  Set Main_Source_File to the input file for the benefit of
 501          --  Errutil.Finalize.
 502
 503          Sinput.Main_Source_File := Infile;
 504
 505          Scanner.Initialize_Scanner (Infile);
 506
 507          --  Output the pragma Source_Reference if asked to
 508
 509          if Source_Ref_Pragma then
 510             Put_Line
 511               (Outfile.all,
 512                "pragma Source_Reference (1, """ &
 513                  Get_Name_String (Sinput.Full_File_Name (Infile)) & """);");
 514          end if;
 515
 516          --  Preprocess the input file
 517
 518          Prep.Preprocess;
 519
 520          --  In verbose mode, if there is no error, report it
 521
 522          if Opt.Verbose_Mode and then Err_Vars.Total_Errors_Detected = 0 then
 523             Errutil.Finalize (Source_Type => "input");
 524          end if;
 525
 526          --  If we had some errors, delete the output file, and report them
 527
 528          if Err_Vars.Total_Errors_Detected > 0 then
 529             if Outfile /= Standard_Output then
 530                Delete (Text_Outfile);
 531             end if;
 532
 533             Errutil.Finalize (Source_Type => "input");
 534
 535             OS_Exit (0);
 536
 537          --  Otherwise, close the output file, and we are done
 538
 539          elsif Outfile /= Standard_Output then
 540             Close (Text_Outfile);
 541          end if;
 542       end Process_One_File;
 543
 544       -----------------------
 545       -- Recursive_Process --
 546       -----------------------
 547
 548       procedure Recursive_Process (In_Dir : String; Out_Dir : String) is
 549          Dir_In : Dir_Type;
 550          Name : String (1 .. 255);
 551          Last : Natural;
 552          In_Dir_Name  : Name_Id;
 553          Out_Dir_Name : Name_Id;
 554
 555          procedure Set_Directory_Names;
 556          --  Establish or reestablish the current input and output directories
 557
 558          -------------------------
 559          -- Set_Directory_Names --
 560          -------------------------
 561
 562          procedure Set_Directory_Names is
 563          begin
 564             Input_Directory := In_Dir_Name;
 565             Output_Directory := Out_Dir_Name;
 566          end Set_Directory_Names;
 567
 568       --  Start of processing for Recursive_Process
 569
 570       begin
 571          --  Open the current input directory
 572
 573          begin
 574             Open (Dir_In, In_Dir);
 575
 576          exception
 577             when Directory_Error =>
 578                Fail ("could not read directory " & In_Dir);
 579          end;
 580
 581          --  Set the new input and output directory names
 582
 583          Name_Len := In_Dir'Length;
 584          Name_Buffer (1 .. Name_Len) := In_Dir;
 585          In_Dir_Name := Name_Find;
 586          Name_Len := Out_Dir'Length;
 587          Name_Buffer (1 .. Name_Len) := Out_Dir;
 588          Out_Dir_Name := Name_Find;
 589
 590          Set_Directory_Names;
 591
 592          --  Traverse the input directory
 593          loop
 594             Read (Dir_In, Name, Last);
 595             exit when Last = 0;
 596
 597             if Name (1 .. Last) /= "." and then Name (1 .. Last) /= ".." then
 598                declare
 599                   Input : constant String :=
 600                             In_Dir & Directory_Separator & Name (1 .. Last);
 601                   Output : constant String :=
 602                              Out_Dir & Directory_Separator & Name (1 .. Last);
 603
 604                begin
 605                   --  If input is an ordinary file, process it
 606
 607                   if Is_Regular_File (Input) then
 608                      --  First get the output file name
 609
 610                      Name_Len := Last;
 611                      Name_Buffer (1 .. Name_Len) := Name (1 .. Last);
 612                      Infile_Name := Name_Find;
 613                      Preprocess_Infile_Name;
 614
 615                      --  Set the input file name and process the file
 616
 617                      Name_Len := Input'Length;
 618                      Name_Buffer (1 .. Name_Len) := Input;
 619                      Infile_Name := Name_Find;
 620                      Process_One_File;
 621
 622                   elsif Is_Directory (Input) then
 623                      --  Input is a directory. If the corresponding output
 624                      --  directory does not already exist, create it.
 625
 626                      if not Is_Directory (Output) then
 627                         begin
 628                            Make_Dir (Dir_Name => Output);
 629
 630                         exception
 631                            when Directory_Error =>
 632                               Fail ("could not create directory """,
 633                                     Output, """");
 634                         end;
 635                      end if;
 636
 637                      --  And process this new input directory
 638
 639                      Recursive_Process (Input, Output);
 640
 641                      --  Reestablish the input and output directory names
 642                      --  that have been modified by the recursive call.
 643
 644                      Set_Directory_Names;
 645                   end if;
 646                end;
 647             end if;
 648          end loop;
 649       end Recursive_Process;
 650
 651    --  Start of processing for Process_Files
 652
 653    begin
 654       if Output_Directory = No_Name then
 655
 656          --  If the output is not a directory, fail if the input is
 657          --  an existing directory, to avoid possible problems.
 658
 659          if Is_Directory (Get_Name_String (Infile_Name)) then
 660             Fail ("input file """ & Get_Name_String (Infile_Name) &
 661                   """ is a directory");
 662          end if;
 663
 664          --  Just process the single input file
 665
 666          Process_One_File;
 667
 668       elsif Input_Directory = No_Name then
 669
 670          --  Get the output file name from the input file name, and process
 671          --  the single input file.
 672
 673          Preprocess_Infile_Name;
 674          Process_One_File;
 675
 676       else
 677          --  Recursively process files in the directory tree rooted at the
 678          --  input directory.
 679
 680          Recursive_Process
 681            (In_Dir => Get_Name_String (Input_Directory),
 682             Out_Dir => Get_Name_String (Output_Directory));
 683       end if;
 684    end Process_Files;
 685
 686    -------------------------
 687    -- Put_Char_To_Outfile --
 688    -------------------------
 689
 690    procedure Put_Char_To_Outfile (C : Character) is
 691    begin
 692       Put (Outfile.all, C);
 693    end Put_Char_To_Outfile;
 694
 695    -----------------------
 696    -- Scan_Command_Line --
 697    -----------------------
 698
 699    procedure Scan_Command_Line is
 700       Switch : Character;
 701
 702    begin
 703       --  First check for --version or --help
 704
 705       Check_Version_And_Help ("GNATPREP", "1996", Usage'Access);
 706
 707       --  Now scan the other switches
 708
 709       GNAT.Command_Line.Initialize_Option_Scan;
 710
 711       loop
 712          begin
 713             Switch := GNAT.Command_Line.Getopt ("D: b c C r s u v");
 714
 715             case Switch is
 716
 717                when ASCII.NUL =>
 718                   exit;
 719
 720                when 'D' =>
 721                   Process_Command_Line_Symbol_Definition
 722                     (S => GNAT.Command_Line.Parameter);
 723
 724                when 'b' =>
 725                   Opt.Blank_Deleted_Lines := True;
 726
 727                when 'c' =>
 728                   Opt.Comment_Deleted_Lines := True;
 729
 730                when 'C' =>
 731                   Opt.Replace_In_Comments := True;
 732
 733                when 'r' =>
 734                   Source_Ref_Pragma := True;
 735
 736                when 's' =>
 737                   Opt.List_Preprocessing_Symbols := True;
 738
 739                when 'u' =>
 740                   Opt.Undefined_Symbols_Are_False := True;
 741
 742                when 'v' =>
 743                   Opt.Verbose_Mode := True;
 744
 745                when others =>
 746                   Fail ("Invalid Switch: -" & Switch);
 747             end case;
 748
 749          exception
 750             when GNAT.Command_Line.Invalid_Switch =>
 751                Write_Str ("Invalid Switch: -");
 752                Write_Line (GNAT.Command_Line.Full_Switch);
 753                Usage;
 754                OS_Exit (1);
 755          end;
 756       end loop;
 757
 758       --  Get the file names
 759
 760       loop
 761          declare
 762             S : constant String := GNAT.Command_Line.Get_Argument;
 763
 764          begin
 765             exit when S'Length = 0;
 766
 767             Name_Len := S'Length;
 768             Name_Buffer (1 .. Name_Len) := S;
 769
 770             if Infile_Name = No_Name then
 771                Infile_Name := Name_Find;
 772             elsif Outfile_Name = No_Name then
 773                Outfile_Name := Name_Find;
 774             elsif Deffile_Name = No_Name then
 775                Deffile_Name := Name_Find;
 776             else
 777                Fail ("too many arguments specifed");
 778             end if;
 779          end;
 780       end loop;
 781    end Scan_Command_Line;
 782
 783    -----------
 784    -- Usage --
 785    -----------
 786
 787    procedure Usage is
 788    begin
 789       Display_Copyright;
 790       Write_Line ("Usage: gnatprep [-bcrsuv] [-Dsymbol=value] " &
 791                     "infile outfile [deffile]");
 792       Write_Eol;
 793       Write_Line ("  infile     Name of the input file");
 794       Write_Line ("  outfile    Name of the output file");
 795       Write_Line ("  deffile    Name of the definition file");
 796       Write_Eol;
 797       Write_Line ("gnatprep switches:");
 798       Write_Line ("   -b  Replace preprocessor lines by blank lines");
 799       Write_Line ("   -c  Keep preprocessor lines as comments");
 800       Write_Line ("   -C  Do symbol replacements within comments");
 801       Write_Line ("   -D  Associate symbol with value");
 802       Write_Line ("   -r  Generate Source_Reference pragma");
 803       Write_Line ("   -s  Print a sorted list of symbol names and values");
 804       Write_Line ("   -u  Treat undefined symbols as FALSE");
 805       Write_Line ("   -v  Verbose mode");
 806       Write_Eol;
 807    end Usage;
 808
 809 end GPrep;