+
+
+sub next_line
+{
+ my $file = shift;
+ my ($in, $out);
+ my $pre_sub_tri_graphs = 1;
+
+ READ: while (not eof IN) {
+ $in .= <IN>;
+ chomp $in;
+ next unless length $in;
+
+ while (length $in) {
+ if ($pre_sub_tri_graphs) {
+ # Preprocess all tri-graphs
+ # including things stuck in quoted string constants.
+ $in =~ s/\?\?=/#/g; # | ??=| #|
+ $in =~ s/\?\?\!/|/g; # | ??!| ||
+ $in =~ s/\?\?'/^/g; # | ??'| ^|
+ $in =~ s/\?\?\(/[/g; # | ??(| [|
+ $in =~ s/\?\?\)/]/g; # | ??)| ]|
+ $in =~ s/\?\?\-/~/g; # | ??-| ~|
+ $in =~ s/\?\?\//\\/g; # | ??/| \|
+ $in =~ s/\?\?</{/g; # | ??<| {|
+ $in =~ s/\?\?>/}/g; # | ??>| }|
+ }
+ if ($in =~ /^\#ifdef __LANGUAGE_PASCAL__/) {
+ # Tru64 disassembler.h evilness: mixed C and Pascal.
+ while (<IN>) {
+ last if /^\#endif/;
+ }
+ $in = "";
+ next READ;
+ }
+ if ($in =~ /^extern inline / && # Inlined assembler.
+ $^O eq 'linux' && $file =~ m!(?:^|/)asm/[^/]+\.h$!) {
+ while (<IN>) {
+ last if /^}/;
+ }
+ $in = "";
+ next READ;
+ }
+ if ($in =~ s/\\$//) { # \-newline
+ $out .= ' ';
+ next READ;
+ } elsif ($in =~ s/^([^"'\\\/]+)//) { # Passthrough
+ $out .= $1;
+ } elsif ($in =~ s/^(\\.)//) { # \...
+ $out .= $1;
+ } elsif ($in =~ /^'/) { # '...
+ if ($in =~ s/^('(\\.|[^'\\])*')//) {
+ $out .= $1;
+ } else {
+ next READ;
+ }
+ } elsif ($in =~ /^"/) { # "...
+ if ($in =~ s/^("(\\.|[^"\\])*")//) {
+ $out .= $1;
+ } else {
+ next READ;
+ }
+ } elsif ($in =~ s/^\/\/.*//) { # //...
+ # fall through
+ } elsif ($in =~ m/^\/\*/) { # /*...
+ # C comment removal adapted from perlfaq6:
+ if ($in =~ s/^\/\*[^*]*\*+([^\/*][^*]*\*+)*\///) {
+ $out .= ' ';
+ } else { # Incomplete /* */
+ next READ;
+ }
+ } elsif ($in =~ s/^(\/)//) { # /...
+ $out .= $1;
+ } elsif ($in =~ s/^([^\'\"\\\/]+)//) {
+ $out .= $1;
+ } elsif ($^O eq 'linux' &&
+ $file =~ m!(?:^|/)linux/byteorder/pdp_endian\.h$! &&
+ $in =~ s!\'T KNOW!!) {
+ $out =~ s!I DON$!I_DO_NOT_KNOW!;
+ } else {
+ if ($opt_e) {
+ warn "Cannot parse $file:\n$in\n";
+ $bad_file{$file} = 1;
+ $in = '';
+ $out = undef;
+ last READ;
+ } else {
+ die "Cannot parse:\n$in\n";
+ }
+ }
+ }
+
+ last READ if $out =~ /\S/;
+ }
+
+ return $out;
+}
+
+
+# Handle recursive subdirectories without getting a grotesquely big stack.
+# Could this be implemented using File::Find?
+sub next_file
+{
+ my $file;
+
+ while (@ARGV) {
+ $file = shift @ARGV;
+
+ if ($file eq '-' or -f $file or -l $file) {
+ return $file;
+ } elsif (-d $file) {
+ if ($opt_r) {
+ expand_glob($file);
+ } else {
+ print STDERR "Skipping directory `$file'\n";
+ }
+ } elsif ($opt_a) {
+ return $file;
+ } else {
+ print STDERR "Skipping `$file': not a file or directory\n";
+ }
+ }
+
+ return undef;
+}
+
+
+# Put all the files in $directory into @ARGV for processing.
+sub expand_glob
+{
+ my ($directory) = @_;
+
+ $directory =~ s:/$::;
+
+ opendir DIR, $directory;
+ foreach (readdir DIR) {
+ next if ($_ eq '.' or $_ eq '..');
+
+ # expand_glob() is going to be called until $ARGV[0] isn't a
+ # directory; so push directories, and unshift everything else.
+ if (-d "$directory/$_") { push @ARGV, "$directory/$_" }
+ else { unshift @ARGV, "$directory/$_" }
+ }
+ closedir DIR;
+}
+
+
+# Given $file, a symbolic link to a directory in the C include directory,
+# make an equivalent symbolic link in $Dest_dir, if we can figure out how.
+# Otherwise, just duplicate the file or directory.
+sub link_if_possible
+{
+ my ($dirlink) = @_;
+ my $target = eval 'readlink($dirlink)';
+
+ if ($target =~ m:^\.\./: or $target =~ m:^/:) {
+ # The target of a parent or absolute link could leave the $Dest_dir
+ # hierarchy, so let's put all of the contents of $dirlink (actually,
+ # the contents of $target) into @ARGV; as a side effect down the
+ # line, $dirlink will get created as an _actual_ directory.
+ expand_glob($dirlink);
+ } else {
+ if (-l "$Dest_dir/$dirlink") {
+ unlink "$Dest_dir/$dirlink" or
+ print STDERR "Could not remove link $Dest_dir/$dirlink: $!\n";
+ }
+
+ if (eval 'symlink($target, "$Dest_dir/$dirlink")') {
+ print "Linking $target -> $Dest_dir/$dirlink\n";
+
+ # Make sure that the link _links_ to something:
+ if (! -e "$Dest_dir/$target") {
+ mkpath("$Dest_dir/$target", 0755) or
+ print STDERR "Could not create $Dest_dir/$target/\n";
+ }
+ } else {
+ print STDERR "Could not symlink $target -> $Dest_dir/$dirlink: $!\n";
+ }
+ }
+}
+
+
+# Push all #included files in $file onto our stack, except for STDIN
+# and files we've already processed.
+sub queue_includes_from
+{
+ my ($file) = @_;
+ my $line;
+
+ return if ($file eq "-");
+
+ open HEADER, $file or return;
+ while (defined($line = <HEADER>)) {
+ while (/\\$/) { # Handle continuation lines
+ chop $line;
+ $line .= <HEADER>;
+ }
+
+ if ($line =~ /^#\s*include\s+([<"])(.*?)[>"]/) {
+ my ($delimiter, $new_file) = ($1, $2);
+ # copy the prefix in the quote syntax (#include "x.h") case
+ if ($delimiter eq q{"} && $file =~ m|^(.*)/|) {
+ $new_file = "$1/$new_file";
+ }
+ push(@ARGV, $new_file) unless $Is_converted{$new_file};
+ }
+ }
+ close HEADER;
+}
+
+
+# Determine include directories; $Config{usrinc} should be enough for (all
+# non-GCC?) C compilers, but gcc uses additional include directories.
+sub inc_dirs
+{
+ my $from_gcc = `LC_ALL=C $Config{cc} -v -E - < /dev/null 2>&1 | awk '/^#include/, /^End of search list/' | grep '^ '`;
+ length($from_gcc) ? (split(' ', $from_gcc), $Config{usrinc}) : ($Config{usrinc});
+}
+
+
+# Create "_h2ph_pre.ph", if it doesn't exist or was built by a different
+# version of h2ph.
+sub build_preamble_if_necessary
+{
+ # Increment $VERSION every time this function is modified:
+ my $VERSION = 3;
+ my $preamble = "$Dest_dir/_h2ph_pre.ph";
+
+ # Can we skip building the preamble file?
+ if (-r $preamble) {
+ # Extract version number from first line of preamble:
+ open PREAMBLE, $preamble or die "Cannot open $preamble: $!";
+ my $line = <PREAMBLE>;
+ $line =~ /(\b\d+\b)/;
+ close PREAMBLE or die "Cannot close $preamble: $!";
+
+ # Don't build preamble if a compatible preamble exists:
+ return if $1 == $VERSION;
+ }
+
+ my (%define) = _extract_cc_defines();
+
+ open PREAMBLE, ">$preamble" or die "Cannot open $preamble: $!";
+ print PREAMBLE "# This file was created by h2ph version $VERSION\n";
+
+ foreach (sort keys %define) {
+ if ($opt_D) {
+ print PREAMBLE "# $_=$define{$_}\n";
+ }
+ if ($define{$_} =~ /^\((.*)\)$/) {
+ # parenthesized value: d=(v)
+ $define{$_} = $1;
+ }
+ if (/^(\w+)\((\w)\)$/) {
+ my($macro, $arg) = ($1, $2);
+ my $def = $define{$_};
+ $def =~ s/$arg/\$\{$arg\}/g;
+ print PREAMBLE <<DEFINE;
+unless (defined &$macro) { sub $macro(\$) { my (\$$arg) = \@_; \"$def\" } }
+
+DEFINE
+ } elsif
+ ($define{$_} =~ /^([+-]?(\d+)?\.\d+([eE][+-]?\d+)?)[FL]?$/) {
+ # float:
+ print PREAMBLE
+ "unless (defined &$_) { sub $_() { $1 } }\n\n";
+ } elsif ($define{$_} =~ /^([+-]?\d+)U?L{0,2}$/i) {
+ # integer:
+ print PREAMBLE
+ "unless (defined &$_) { sub $_() { $1 } }\n\n";
+ } elsif ($define{$_} =~ /^\w+$/) {
+ my $def = $define{$_};
+ if ($isatype{$def}) {
+ print PREAMBLE
+ "unless (defined &$_) { sub $_() { \"$def\" } }\n\n";
+ } else {
+ print PREAMBLE
+ "unless (defined &$_) { sub $_() { &$def } }\n\n";
+ }
+ } else {
+ print PREAMBLE
+ "unless (defined &$_) { sub $_() { \"",
+ quotemeta($define{$_}), "\" } }\n\n";
+ }
+ }
+ print PREAMBLE "\n1;\n"; # avoid 'did not return a true value' when empty
+ close PREAMBLE or die "Cannot close $preamble: $!";
+}
+
+
+# %Config contains information on macros that are pre-defined by the
+# system's compiler. We need this information to make the .ph files
+# function with perl as the .h files do with cc.
+sub _extract_cc_defines
+{
+ my %define;
+ my $allsymbols = join " ",
+ @Config{'ccsymbols', 'cppsymbols', 'cppccsymbols'};
+
+ # Split compiler pre-definitions into `key=value' pairs:
+ while ($allsymbols =~ /([^\s]+)=((\\\s|[^\s])+)/g) {
+ $define{$1} = $2;
+ if ($opt_D) {
+ print STDERR "$_: $1 -> $2\n";
+ }
+ }
+
+ return %define;
+}
+
+
+1;
+