This file is indexed.

/usr/bin/autoscan is in autoconf 2.69-1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
#! /usr/bin/perl -w
# -*- perl -*-
# Generated from autoscan.in; do not edit by hand.

# autoscan - Create configure.scan (a preliminary configure.ac) for a package.
# Copyright (C) 1994, 1999-2012 Free Software Foundation, Inc.

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Written by David MacKenzie <djm@gnu.ai.mit.edu>.

eval 'case $# in 0) exec /usr/bin/perl -S "$0";; *) exec /usr/bin/perl -S "$0" "$@";; esac'
    if 0;

BEGIN
{
  my $pkgdatadir = $ENV{'autom4te_perllibdir'} || '/usr/share/autoconf';
  unshift @INC, $pkgdatadir;

  # Override SHELL.  On DJGPP SHELL may not be set to a shell
  # that can handle redirection and quote arguments correctly,
  # e.g.: COMMAND.COM.  For DJGPP always use the shell that configure
  # has detected.
  $ENV{'SHELL'} = '/bin/bash' if ($^O eq 'dos');
}

use Autom4te::ChannelDefs;
use Autom4te::Configure_ac;
use Autom4te::General;
use Autom4te::FileUtils;
use Autom4te::XFile;
use File::Basename;
use File::Find;
use strict;

use vars qw(@cfiles @makefiles @shfiles @subdirs %printed);

# The kind of the words we are looking for.
my @kinds = qw (function header identifier program
		makevar librarie);

# For each kind, the default macro.
my %generic_macro =
  (
   'function'   => 'AC_CHECK_FUNCS',
   'header'     => 'AC_CHECK_HEADERS',
   'identifier' => 'AC_CHECK_TYPES',
   'program'    => 'AC_CHECK_PROGS',
   'library'    => 'AC_CHECK_LIB'
  );

my %kind_comment =
  (
   'function'   => 'Checks for library functions.',
   'header'     => 'Checks for header files.',
   'identifier' => 'Checks for typedefs, structures, and compiler characteristics.',
   'program'    => 'Checks for programs.',
  );

# $USED{KIND}{ITEM} is the list of locations where the ITEM (of KIND) was used
# in the user package.
# For instance $USED{function}{alloca} is the list of `file:line' where
# `alloca (...)' appears.
my %used = ();

# $MACRO{KIND}{ITEM} is the list of macros to use to test ITEM.
# Initialized from lib/autoscan/*.  E.g., $MACRO{function}{alloca} contains
# the singleton AC_FUNC_ALLOCA.  Some require several checks.
my %macro = ();

# $NEEDED_MACROS{MACRO} is an array of locations requiring MACRO.
# E.g., $NEEDED_MACROS{AC_FUNC_ALLOC} the list of `file:line' containing
# `alloca (...)'.
my %needed_macros =
  (
   'AC_PREREQ' => [$me],
  );

my $configure_scan = 'configure.scan';
my $log;

# Autoconf and lib files.
my $autom4te = $ENV{'AUTOM4TE'} || '/usr/bin/autom4te';
my $autoconf = "$autom4te --language=autoconf";
my @prepend_include;
my @include = ('/usr/share/autoconf');

# $help
# -----
$help = "Usage: $0 [OPTION]... [SRCDIR]

Examine source files in the directory tree rooted at SRCDIR, or the
current directory if none is given.  Search the source files for
common portability problems, check for incompleteness of
`configure.ac', and create a file `$configure_scan' which is a
preliminary `configure.ac' for that package.

  -h, --help          print this help, then exit
  -V, --version       print version number, then exit
  -v, --verbose       verbosely report processing
  -d, --debug         don't remove temporary files

Library directories:
  -B, --prepend-include=DIR  prepend directory DIR to search path
  -I, --include=DIR          append directory DIR to search path

Report bugs to <bug-autoconf\@gnu.org>.
GNU Autoconf home page: <http://www.gnu.org/software/autoconf/>.
General help using GNU software: <http://www.gnu.org/gethelp/>.
";

# $version
# --------
$version = "autoscan (GNU Autoconf) 2.69
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+/Autoconf: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>, <http://gnu.org/licenses/exceptions.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by David J. MacKenzie and Akim Demaille.
";




## ------------------------ ##
## Command line interface.  ##
## ------------------------ ##

# parse_args ()
# -------------
# Process any command line arguments.
sub parse_args ()
{
  getopt ('I|include=s' => \@include,
	  'B|prepend-include=s' => \@prepend_include);

  die "$me: too many arguments
Try `$me --help' for more information.\n"
    if @ARGV > 1;

  my $srcdir = $ARGV[0] || ".";

  verb "srcdir = $srcdir";
  chdir $srcdir || error "cannot cd to $srcdir: $!";
}


# init_tables ()
# --------------
# Put values in the tables of what to do with each token.
sub init_tables ()
{
  # The data file format supports only one line of macros per function.
  # If more than that is required for a common portability problem,
  # a new Autoconf macro should probably be written for that case,
  # instead of duplicating the code in lots of configure.ac files.
  my $file = find_file ("autoscan/autoscan.list",
			reverse (@prepend_include), @include);
  my $table = new Autom4te::XFile "< " . open_quote ($file);
  my $tables_are_consistent = 1;

  while ($_ = $table->getline)
    {
      # Ignore blank lines and comments.
      next
	if /^\s*$/ || /^\s*\#/;

      # '<kind>: <word> <macro invocation>' or...
      # '<kind>: <word> warn: <message>'.
      if (/^(\S+):\s+(\S+)\s+(\S.*)$/)
	{
	  my ($kind, $word, $macro) = ($1, $2, $3);
	  error "$file:$.: invalid kind: $_"
	    unless grep { $_ eq $kind } @kinds;
	  push @{$macro{$kind}{$word}}, $macro;
	}
      else
	{
	  error "$file:$.: invalid definition: $_";
	}
    }

  if ($debug)
    {
      foreach my $kind (@kinds)
	{
	  foreach my $word (sort keys %{$macro{$kind}})
	    {
	      print "$kind: $word: @{$macro{$kind}{$word}}\n";
	    }
	}

    }
}


# used ($KIND, $WORD, [$WHERE])
# -----------------------------
# $WORD is used as a $KIND.
sub used ($$;$)
{
  my ($kind, $word, $where) = @_;
  $where ||= "$File::Find::name:$.";
  if (
      # Check for all the libraries.  But `-links' is certainly a
      # `find' argument, and `-le', a `test' argument.
      ($kind eq 'library' && $word !~ /^(e|inks)$/)
      # Other than libraries are to be checked only if listed in
      # the Autoscan library files.
      || defined $macro{$kind}{$word}
     )
    {
      push (@{$used{$kind}{$word}}, $where);
    }
}



## ----------------------- ##
## Scanning source files.  ##
## ----------------------- ##


# scan_c_file ($FILE-NAME)
# ------------------------
sub scan_c_file ($)
{
  my ($file_name) = @_;
  push @cfiles, $File::Find::name;

  # Nonzero if in a multiline comment.
  my $in_comment = 0;

  my $file = new Autom4te::XFile "< " . open_quote ($file_name);

  while ($_ = $file->getline)
    {
      # Strip out comments.
      if ($in_comment && s,^.*?\*/,,)
	{
	  $in_comment = 0;
	}
      # The whole line is inside a comment.
      next if $in_comment;
      # All on one line.
      s,/\*.*?\*/,,g;

      # Starting on this line.
      if (s,/\*.*$,,)
	{
	  $in_comment = 1;
	}

      # Preprocessor directives.
      if (s/^\s*\#\s*//)
	{
	  if (/^include\s*<([^>]*)>/)
	    {
	      used ('header', $1);
	    }
	  if (s/^(if|ifdef|ifndef|elif)\s+//)
	    {
	      foreach my $word (split (/\W+/))
		{
		  used ('identifier', $word)
		    unless $word eq 'defined' || $word !~ /^[a-zA-Z_]/;
		}
	    }
	  # Ignore other preprocessor directives.
	  next;
	}

      # Remove string and character constants.
      s,\"[^\"]*\",,g;
      s,\'[^\']*\',,g;

      # Tokens in the code.
      # Maybe we should ignore function definitions (in column 0)?
      while (s/\b([a-zA-Z_]\w*)\s*\(/ /)
	{
	  used ('function', $1);
	}
      while (s/\b([a-zA-Z_]\w*)\b/ /)
	{
	  used ('identifier', $1);
	}
    }

  $file->close;
}


# scan_makefile($MAKEFILE-NAME)
# -----------------------------
sub scan_makefile ($)
{
  my ($file_name) = @_;
  push @makefiles, $File::Find::name;

  my $file = new Autom4te::XFile "< " . open_quote ($file_name);

  while ($_ = $file->getline)
    {
      # Strip out comments.
      s/#.*//;

      # Variable assignments.
      while (s/\b([a-zA-Z_]\w*)\s*=/ /)
	{
	  used ('makevar', $1);
	}
      # Be sure to catch a whole word.  For instance `lex$U.$(OBJEXT)'
      # is a single token.  Otherwise we might believe `lex' is needed.
      foreach my $word (split (/\s+/))
	{
	  # Libraries.
	  if ($word =~ /^-l([a-zA-Z_]\w*)$/)
	    {
	      used ('library', $1);
	    }
	  # Tokens in the code.
	  # We allow some additional characters, e.g., `+', since
	  # autoscan/programs includes `c++'.
	  if ($word =~ /^[a-zA-Z_][\w+]*$/)
	    {
	      used ('program', $word);
	    }
	}
    }

  $file->close;
}


# scan_sh_file($SHELL-SCRIPT-NAME)
# --------------------------------
sub scan_sh_file ($)
{
  my ($file_name) = @_;
  push @shfiles, $File::Find::name;

  my $file = new Autom4te::XFile "< " . open_quote ($file_name);

  while ($_ = $file->getline)
    {
      # Strip out comments and variable references.
      s/#.*//;
      s/\${[^\}]*}//g;
      s/@[^@]*@//g;

      # Tokens in the code.
      while (s/\b([a-zA-Z_]\w*)\b/ /)
	{
	  used ('program', $1);
	}
    }

  $file->close;
}


# scan_file ()
# ------------
# Called by &find on each file.  $_ contains the current file name with
# the current directory of the walk through.
sub scan_file ()
{
  # Wanted only if there is no corresponding FILE.in.
  return
    if -f "$_.in";

  # Save $_ as Find::File requires it to be preserved.
  local $_ = $_;

  # Strip a useless leading `./'.
  $File::Find::name =~ s,^\./,,;

  if ($_ ne '.' and -d $_ and
      -f "$_/configure.in"  ||
      -f "$_/configure.ac"  ||
      -f "$_/configure.gnu" ||
      -f "$_/configure")
    {
      $File::Find::prune = 1;
      push @subdirs, $File::Find::name;
    }
  if (/\.[chlym](\.in)?$/)
    {
      used 'program', 'cc', $File::Find::name;
      scan_c_file ($_);
    }
  elsif (/\.(cc|cpp|cxx|CC|C|hh|hpp|hxx|HH|H|yy|ypp|ll|lpp)(\.in)?$/)
    {
      used 'program', 'c++', $File::Find::name;
      scan_c_file ($_);
    }
  elsif ((/^((?:GNUm|M|m)akefile)(\.in)?$/ && ! -f "$1.am")
	 || /^(?:GNUm|M|m)akefile(\.am)?$/)
    {
      scan_makefile ($_);
    }
  elsif (/\.sh(\.in)?$/)
    {
      scan_sh_file ($_);
    }
}


# scan_files ()
# -------------
# Read through the files and collect lists of tokens in them
# that might create nonportabilities.
sub scan_files ()
{
  find (\&scan_file, '.');

  if ($verbose)
    {
      print "cfiles: @cfiles\n";
      print "makefiles: @makefiles\n";
      print "shfiles: @shfiles\n";

      foreach my $kind (@kinds)
	{
	  print "\n$kind:\n";
	  foreach my $word (sort keys %{$used{$kind}})
	    {
	      print "$word: @{$used{$kind}{$word}}\n";
	    }
	}
    }
}


## ----------------------- ##
## Output configure.scan.  ##
## ----------------------- ##


# output_kind ($FILE, $KIND)
# --------------------------
sub output_kind ($$)
{
  my ($file, $kind) = @_;
  # Lists of words to be checked with the generic macro.
  my @have;

  print $file "\n# $kind_comment{$kind}\n"
    if exists $kind_comment{$kind};
  foreach my $word (sort keys %{$used{$kind}})
    {
      # Output the needed macro invocations in $configure_scan if not
      # already printed, and remember these macros are needed.
      foreach my $macro (@{$macro{$kind}{$word}})
	{
	  if ($macro =~ /^warn:\s+(.*)/)
	    {
	      my $message = $1;
	      foreach my $location (@{$used{$kind}{$word}})
		{
		  warn "$location: warning: $message\n";
		}
	    }
	  elsif (exists $generic_macro{$kind}
	      && $macro eq $generic_macro{$kind})
	    {
	      push (@have, $word);
	      push (@{$needed_macros{"$generic_macro{$kind}([$word])"}},
		    @{$used{$kind}{$word}});
	    }
	  else
	    {
	      if (! $printed{$macro})
		{
		  print $file "$macro\n";
		  $printed{$macro} = 1;
		}
	      push (@{$needed_macros{$macro}},
		    @{$used{$kind}{$word}});
	    }
	}
    }
  print $file "$generic_macro{$kind}([" . join(' ', sort(@have)) . "])\n"
    if @have;
}


# output_libraries ($FILE)
# ------------------------
sub output_libraries ($)
{
  my ($file) = @_;

  print $file "\n# Checks for libraries.\n";
  foreach my $word (sort keys %{$used{'library'}})
    {
      print $file "# FIXME: Replace `main' with a function in `-l$word':\n";
      print $file "AC_CHECK_LIB([$word], [main])\n";
    }
}


# output ($CONFIGURE_SCAN)
# ------------------------
# Print a proto configure.ac.
sub output ($)
{
  my $configure_scan = shift;
  my %unique_makefiles;

  my $file = new Autom4te::XFile "> " . open_quote ($configure_scan);

  print $file
    ("#                                               -*- Autoconf -*-\n" .
     "# Process this file with autoconf to produce a configure script.\n" .
     "\n" .
     "AC_PREREQ([2.69])\n" .
     "AC_INIT([FULL-PACKAGE-NAME], [VERSION], [BUG-REPORT-ADDRESS])\n");
  if (defined $cfiles[0])
    {
      print $file "AC_CONFIG_SRCDIR([$cfiles[0]])\n";
      print $file "AC_CONFIG_HEADERS([config.h])\n";
    }

  output_kind ($file, 'program');
  output_kind ($file, 'makevar');
  output_libraries ($file);
  output_kind ($file, 'header');
  output_kind ($file, 'identifier');
  output_kind ($file, 'function');

  print $file "\n";
  if (@makefiles)
    {
      # Change DIR/Makefile.in to DIR/Makefile.
      foreach my $m (@makefiles)
	{
	  $m =~ s/\.(?:in|am)$//;
	  $unique_makefiles{$m}++;
	}
      print $file ("AC_CONFIG_FILES([",
		   join ("\n                 ",
			 sort keys %unique_makefiles), "])\n");
    }
  if (@subdirs)
    {
      print $file ("AC_CONFIG_SUBDIRS([",
		   join ("\n                   ",
			 sort @subdirs), "])\n");
    }
  print $file "AC_OUTPUT\n";

  $file->close;
}



## --------------------------------------- ##
## Checking the accuracy of configure.ac.  ##
## --------------------------------------- ##


# &check_configure_ac ($CONFIGURE_AC)
# -----------------------------------
# Use autoconf to check if all the suggested macros are included
# in CONFIGURE_AC.
sub check_configure_ac ($)
{
  my ($configure_ac) = @_;

  # Find what needed macros are invoked in CONFIGURE_AC.
  # I'd be very happy if someone could explain to me why sort (uniq ...)
  # doesn't work properly: I need `uniq (sort ...)'.  --akim
  my $trace_option =
    join (' --trace=', '',
	  uniq (sort (map { s/\(.*//; $_ } keys %needed_macros)));

  verb "running: $autoconf $trace_option $configure_ac";
  my $traces =
    new Autom4te::XFile "$autoconf $trace_option $configure_ac |";

  while ($_ = $traces->getline)
    {
      chomp;
      my ($file, $line, $macro, @args) = split (/:/, $_);
      if ($macro =~ /^AC_CHECK_(HEADER|FUNC|TYPE|MEMBER)S$/)
	{
	  # To be rigorous, we should distinguish between space and comma
	  # separated macros.  But there is no point.
	  foreach my $word (split (/\s|,/, $args[0]))
	    {
	      # AC_CHECK_MEMBERS wants `struct' or `union'.
	      if ($macro eq "AC_CHECK_MEMBERS"
		  && $word =~ /^stat.st_/)
		{
		  $word = "struct " . $word;
		}
	      delete $needed_macros{"$macro([$word])"};
	    }
	}
      else
	{
	  delete $needed_macros{$macro};
	}
    }

  $traces->close;

  # Report the missing macros.
  foreach my $macro (sort keys %needed_macros)
    {
      warn ("$configure_ac: warning: missing $macro wanted by: "
	    . (${$needed_macros{$macro}}[0])
	    . "\n");
      print $log "$me: warning: missing $macro wanted by: \n";
      foreach my $need (@{$needed_macros{$macro}})
	{
	  print $log "\t$need\n";
	}
    }
}


## -------------- ##
## Main program.  ##
## -------------- ##

parse_args;
$log = new Autom4te::XFile "> " . open_quote ("$me.log");

$autoconf .= " --debug" if $debug;
$autoconf .= " --verbose" if $verbose;
$autoconf .= join (' --include=', '', map { shell_quote ($_) } @include);
$autoconf .= join (' --prepend-include=', '', map { shell_quote ($_) } @prepend_include);

my $configure_ac = find_configure_ac;
init_tables;
scan_files;
output ('configure.scan');
if (-f $configure_ac)
  {
    check_configure_ac ($configure_ac);
  }
# This close is really needed.  For some reason, probably best named
# a bug, it seems that the dtor of $LOG is not called automatically
# at END.  It results in a truncated file.
$log->close;
exit 0;

### Setup "GNU" style for perl-mode and cperl-mode.
## Local Variables:
## perl-indent-level: 2
## perl-continued-statement-offset: 2
## perl-continued-brace-offset: 0
## perl-brace-offset: 0
## perl-brace-imaginary-offset: 0
## perl-label-offset: -2
## cperl-indent-level: 2
## cperl-brace-offset: 0
## cperl-continued-brace-offset: 0
## cperl-label-offset: -2
## cperl-extra-newline-before-brace: t
## cperl-merge-trailing-else: nil
## cperl-continued-statement-offset: 2
## End: