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#!/usr/bin/perl
#============================================================================
#
# PUBLIC DOMAIN NOTICE
# National Center for Biotechnology Information
#
# This software/database is a "United States Government Work" under the
# terms of the United States Copyright Act. It was written as part of
# the author's official duties as a United States Government employee and
# thus cannot be copyrighted. This software/database is freely available
# to the public for use. The National Library of Medicine and the U.S.
# Government have not placed any restriction on its use or reproduction.
#
# Although all reasonable efforts have been taken to ensure the accuracy
# and reliability of the software and data, the NLM and the U.S.
# Government do not and cannot warrant the performance or results that
# may be obtained by using this software or data. The NLM and the U.S.
# Government disclaim all warranties, express or implied, including
# warranties of performance, merchantability or fitness for any particular
# purpose.
#
# Please cite the author in any work or product based on this material.
#
# ===========================================================================
use IO::Handle;
use IO::File;
use IPC::Open2;
use FileHandle;
my $libname;
my $libvers;
my $GCC = '';
my @files;
sub USAGE() {
print "Usage: $0 -o <lib name> [-v <lib vers file>] <gcc spec> -- <header files>\n";
exit 1;
}
sub file_contents($) {
local $/;
local $_ = shift;
my $fh;
$fh = new IO::File $_, 'r' or die "can't open $_ for read";
undef $/;
$_ = <$fh>;
undef $fh;
return $_;
}
sub process_args() {
my $i;
for ($i = 0; $i < scalar(@ARGV); ++$i) {
$_ = $ARGV[$i];
last unless /^-(.)/;
if ($1 eq 'o') {
$libname = $ARGV[++$i];
}
elsif ($1 eq 'v') {
$_ = $ARGV[++$i];
$_ = file_contents($_);
chomp;
warn "vers file is empty" if /^$/;
if (/(\d+)\.(\d+)\.(\d+)/) {
$libvers = "$1.$2";
}
else {
warn "'$_' is not a valid version";
}
}
else {
USAGE;
}
}
# USAGE unless $libname;
for ( ; $i != scalar(@ARGV); ++$i) {
$_ = $ARGV[$i];
last if $_ eq '--';
$GCC .= "$_ ";
}
for (++$i; $i != scalar(@ARGV); ++$i) {
push @files, $ARGV[$i];
}
}
sub next_token($) {
local $_;
my $src = shift;
if ($src =~ /^(\s*)/) {
$src = substr $src, length($1);
}
if ($src =~ /^([^ ]+)/) {
$_ = $1;
if (/^([A-Za-z_][A-Za-z0-9_]+)/) {
$_ = $1;
$src = substr $src, length($_);
return ($src, 'ident', $_);
}
else {
$_ = substr $src, 0, 1;
$src = substr $src, 1;
return ($src, 'unknown', $_);
}
}
return ($src, undef, undef);
}
my $id;
my $pt_st = 0;
my $visibility = 'extern';
sub process_token($$) {
my $type = shift;
my $tok = shift;
if ($tok eq ';' || $tok eq ',') {
if (($pt_st == 4 || $pt_st == 5) && $visibility eq 'extern') {
if ($id) {
print "\t$id\n";
}
}
$id = undef;
if ($tok eq ';') {
$pt_st = 0;
$visibility = 'extern';
}
return;
}
if ($pt_st == 0) {
unless ($type eq 'ident') {
$pt_st = 1;
return;
}
if ($tok eq 'extern' || $tok eq 'static') {
$visibility = $tok;
}
elsif ($tok eq 'typedef') {
$pt_st = 1;
}
else {
if ($tok eq 'const' || $tok eq 'volatile') {
$pt_st = 2;
}
else {
$pt_st = ($tok eq 'struct' || $tok eq 'class' || $tok eq 'union' || $tok eq 'enum') ? 3 : 4;
}
}
return;
}
if ($pt_st == 1) {
return;
}
if ($pt_st == 2) {
unless ($type eq 'ident') {
$pt_st = 1;
return;
}
$pt_st = ($tok eq 'struct' || $tok eq 'class' || $tok eq 'union' || $tok eq 'enum') ? 3 : 4;
return;
}
if ($pt_st == 3) {
unless ($type eq 'ident') {
$pt_st = 1;
return;
}
$pt_st = 4;
return;
}
if ($pt_st == 4) {
if ($tok eq '__attribute__') {
$pt_st = 5;
return;
}
$id = $tok if $type eq 'ident';
return;
}
if ($pt_st == 5) {
return;
}
warn 'unpossible';
}
my $level = 0;
sub parse($$);
sub parse($$) {
my $src = shift;
my $end = shift;
my $tok;
my $type;
++$level;
while (($src, $type, $tok) = next_token($src), defined($tok)) {
last if ($tok eq $end);
process_token($type, $tok) if ($level == 1);
$src = parse($src, ')') if ($tok eq '(');
$src = parse($src, '}') if ($tok eq '{');
$src = parse($src, ']') if ($tok eq '[');
}
--$level;
return $src;
}
sub process_files() {
my $gcc_out;
my $gcc_in;
my $src = '';
open2($gcc_in, $gcc_out, "$GCC") or die "can't run preprocessor $GCC";
foreach (@files) {
next unless $_;
$_ = file_contents($_);
next unless $_;
s/^\#include\s.+$//gm unless /weak\.h/;
$gcc_out->print($_);
}
undef $gcc_out; # else gcc won't produce output
while ($_ = <$gcc_in>, defined($_)) {
next if /^\s*$/;
next if /^#/;
chomp;
$src .= " $_";
}
return $src;
}
process_args;
USAGE unless $GCC;
USAGE unless scalar(@files);
if (defined $libname) {
print "LIBRARY $libname\n";
print "VERSION $libvers\n" if $libvers;
print "EXPORTS\n";
}
parse(process_files(), '');
exit 0;
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