#! @PERL@

# autoscan - Create configure.scan (a preliminary configure.in) for a package.

# Copyright (C) 1994 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 2, 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, write to the Free Software

# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA

# 02111-1307, USA.

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

require "find.pl";

$datadir = $ENV{"AC_MACRODIR"} || "@datadir@";

$verbose = 0;

# Reference these variables to pacify perl -w.

undef %identifiers_macros;

undef %makevars_macros;

undef %programs_macros;

&parse_args;

&init_tables;

&find('.');

&scan_files;

&output;

exit 0;

# Process any command line arguments.

sub parse_args

{

    local ($usage) =

	"Usage: autoscan [--macrodir=dir] [--help] [--verbose] [--version] [srcdir]\n"; 

    foreach $_ (@ARGV) {

	if (/^--m[a-z]*=(.*)/) {

	    $datadir = $1;

	} elsif (/^--h/) {

	    print "$usage";

	    exit 0;

	} elsif (/^--verb/) {

	    $verbose = 1;

	} elsif (/^--vers/) {

	    &version;

	} elsif (/^[^-]/) {

	    die "$usage" if defined($srcdir);

	    # Top level directory of the package being autoscanned.

	    $srcdir = $_;

	} else {

	    die "$usage";

	}

    }

    $srcdir="." if !defined($srcdir);

    print "srcdir=$srcdir\n" if $verbose;

    chdir $srcdir || die "$0: cannot cd to $srcdir: $!\n";

    open(CONF, ">configure.scan") ||

	die "$0: cannot create configure.scan: $!\n";

}

# Print the version number and exit.

sub version

{

    open(ACG, "<$datadir/acgeneral.m4") ||

	die "$0: cannot open $datadir/acgeneral.m4: $!\n";

    while (<ACG>) {

	if (/define.AC_ACVERSION.\s*([0-9.]+)/) {

	    print "Autoconf version $1\n";

	    exit 0;

	}

    }

    die "Autoconf version unknown\n";

}

# Put values in the tables of what to do with each token.

sub init_tables

{

    local($kind, $word, $macro);

    # Initialize a table of C keywords (to ignore).

    # Taken from K&R 1st edition p. 180.

    # ANSI C, GNU C, and C++ keywords can introduce portability problems,

    # so don't ignore them.

    foreach $word ('int', 'char', 'float', 'double', 'struct', 'union',

		   'long', 'short', 'unsigned', 'auto', 'extern', 'register',

		   'typedef', 'static', 'goto', 'return', 'sizeof', 'break',

		   'continue', 'if', 'else', 'for', 'do', 'while', 'switch',

		   'case', 'default') {

	$c_keywords{$word} = 0;

    }

    # 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.in files.

    foreach $kind ('functions', 'headers', 'identifiers', 'programs',

		   'makevars') {

	open(TABLE, "<$datadir/ac$kind") ||

	    die "$0: cannot open $datadir/ac$kind: $!\n";

	while () {

	    next if /^\s*$/ || /^\s*#/; # Ignore blank lines and comments.

	    ($word, $macro) = split;

	    eval "\$$kind" . "_macros{\$word} = \$macro";

	}

	close(TABLE);

    }

}

# Collect names of various kinds of files in the package.

# Called by &find on each file.

sub wanted

{

    if (/^.*\.[chlymC]$/ || /^.*\.cc$/) {

	$name =~ s?^\./??; push(@cfiles, $name);

    }

    elsif (/^[Mm]akefile$/ || /^[Mm]akefile\.in$/ || /^GNUmakefile$/) {

	$name =~ s?^\./??; push(@makefiles, $name);

    }

    elsif (/^.*\.sh$/) {

	$name =~ s?^\./??; push(@shfiles, $name);

    }

}

# Read through the files and collect lists of tokens in them

# that might create nonportabilities.

sub scan_files

{

    $initfile = $cfiles[0];		# Pick one at random.

    if ($verbose) {

	print "cfiles:", join(" ", @cfiles), "\n";

	print "makefiles:", join(" ", @makefiles), "\n";

	print "shfiles:", join(" ", @shfiles), "\n";

    }

    foreach $file (@cfiles) {

	&scan_c_file($file);

    }

    foreach $file (@makefiles) {

	&scan_makefile($file);

    }

    foreach $file (@shfiles) {

	&scan_sh_file($file);

    }

}

sub scan_c_file

{

    local($file) = @_;

    local($in_comment) = 0;	# Nonzero if in a multiline comment.

    open(CFILE, "<$file") || die "$0: cannot open $file: $!\n";

    while (<CFILE>) {

	# Strip out comments, approximately.

	# Ending on this line.

	if ($in_comment && m,\*/,) {

	    s,.*\*/,,;

	    $in_comment = 0;

	}

	# All on one line.

	s,/\*.*\*/,,g;

	# Starting on this line.

	if (m,/\*,) {

	    $in_comment = 1;

	}

	# Continuing on this line.

	next if $in_comment;

	# Preprocessor directives.

	if (/^\s*#\s*include\s*<([^>]*)>/) {

	    $headers{$1}++;

	}

	# Ignore other preprocessor directives.

	next if /^\s*#/;

	# Remove string and character constants.

	s,\"[^\"]*\",,g;

        s,\'[^\']*\',,g;

	# Tokens in the code.

	# Maybe we should ignore function definitions (in column 0)?

	while (s/\W([a-zA-Z_]\w*)\s*\(/ /) {

	    $functions{$1}++ if !defined($c_keywords{$1});

	}

	while (s/\W([a-zA-Z_]\w*)\W/ /) {

	    $identifiers{$1}++ if !defined($c_keywords{$1});

	}

    }

    close(CFILE);

    if ($verbose) {

	local($word);

	print "\n$file functions:\n";

	foreach $word (sort keys %functions) {

	    print "$word $functions{$word}\n";

	}

	print "\n$file identifiers:\n";

	foreach $word (sort keys %identifiers) {

	    print "$word $identifiers{$word}\n";

	}

	print "\n$file headers:\n";

	foreach $word (sort keys %headers) {

	    print "$word $headers{$word}\n";

	}

    }

}

sub scan_makefile

{

    local($file) = @_;

    open(MFILE, "<$file") || die "$0: cannot open $file: $!\n";

    while (<MFILE>) {

	# Strip out comments and variable references.

	s/#.*//;

	s/\$\([^\)]*\)//g;

	s/\${[^\}]*}//g;

	s/@[^@]*@//g;

	# Variable assignments.

	while (s/\W([a-zA-Z_]\w*)\s*=/ /) {

	    $makevars{$1}++;

	}

	# Libraries.

	while (s/\W-l([a-zA-Z_]\w*)\W/ /) {

	    $libraries{$1}++;

	}

	# Tokens in the code.

	while (s/\W([a-zA-Z_]\w*)\W/ /) {

	    $programs{$1}++;

	}

    }

    close(MFILE);

    if ($verbose) {

	local($word);

	print "\n$file makevars:\n";

	foreach $word (sort keys %makevars) {

	    print "$word $makevars{$word}\n";

	}

	print "\n$file libraries:\n";

	foreach $word (sort keys %libraries) {

	    print "$word $libraries{$word}\n";

	}

	print "\n$file programs:\n";

	foreach $word (sort keys %programs) {

	    print "$word $programs{$word}\n";

	}

    }

}

sub scan_sh_file

{

    local($file) = @_;

    open(MFILE, "<$file") || die "$0: cannot open $file: $!\n";

    while (<MFILE>) {

	# Strip out comments and variable references.

	s/#.*//;

	s/\${[^\}]*}//g;

	s/@[^@]*@//g;

	# Tokens in the code.

	while (s/\W([a-zA-Z_]\w*)\W/ /) {

	    $programs{$1}++;

	}

    }

    close(MFILE);

    if ($verbose) {

	local($word);

	print "\n$file programs:\n";

	foreach $word (sort keys %programs) {

	    print "$word $programs{$word}\n";

	}

    }

}

# Print a configure.in.

sub output

{

    local (%unique_makefiles);

    print CONF "dnl Process this file with autoconf to produce a configure script.\n";

    print CONF "AC_INIT($initfile)\n";

    &output_programs;

    &output_headers;

    &output_identifiers;

    &output_functions;

    # Change DIR/Makefile.in to DIR/Makefile.

    foreach $_ (@makefiles) {

	s/\.in$//;

	$unique_makefiles{$_}++;

    }

    print CONF "\nAC_OUTPUT(", join(" ", keys(%unique_makefiles)), ")\n";

    close CONF;

}

# Print Autoconf macro $1 if it's not undef and hasn't been printed already.

sub print_unique

{

    local($macro) = @_;

    if (defined($macro) && !defined($printed{$macro})) {

	print CONF "$macro\n";

	$printed{$macro} = 1;

    }

}

sub output_programs

{

    local ($word);

    print CONF "\ndnl Checks for programs.\n";

    foreach $word (sort keys %programs) {

	&print_unique($programs_macros{$word});

    }

    foreach $word (sort keys %makevars) {

	&print_unique($makevars_macros{$word});

    }

    print CONF "\ndnl Checks for libraries.\n";

    foreach $word (sort keys %libraries) {

	print CONF "dnl Replace `\main\' with a function in -l$word:\n";

	print CONF "AC_CHECK_LIB($word, main)\n";

    }

}

sub output_headers

{

    local ($word);

    print CONF "\ndnl Checks for header files.\n";

    foreach $word (sort keys %headers) {

	if (defined($headers_macros{$word}) &&

	    $headers_macros{$word} eq 'AC_CHECK_HEADERS') {

	    push(@have_headers, $word);

	} else {	

	    &print_unique($headers_macros{$word});

	}

    }

    print CONF "AC_CHECK_HEADERS(" . join(' ', sort(@have_headers)) . ")\n"

	if defined(@have_headers);

}

sub output_identifiers

{

    local ($word);

    print CONF "\ndnl Checks for typedefs, structures, and compiler characteristics.\n";

    foreach $word (sort keys %identifiers) {

	&print_unique($identifiers_macros{$word});

    }

}

sub output_functions

{

    local ($word);

    print CONF "\ndnl Checks for library functions.\n";

    foreach $word (sort keys %functions) {

	if (defined($functions_macros{$word}) &&

	    $functions_macros{$word} eq 'AC_CHECK_FUNCS') {

	    push(@have_funcs, $word);

	} else {	

	    &print_unique($functions_macros{$word});

	}

    }

    print CONF "AC_CHECK_FUNCS(" . join(' ', sort(@have_funcs)) . ")\n"

	if defined(@have_funcs);

}