#!/usr/bin/perl
eval 'exec /usr/bin/perl -S $0 ${1+"$@"}'
if $running_under_some_shell;

BEGIN { pop @INC if $INC[-1] eq '.' }

use strict;

use Config;
use File::Path qw(mkpath);
use Getopt::Std;

# Make sure read permissions for all are set:
if (defined umask && (umask() & 0444)) {
umask (umask() & ~0444);
}

getopts('Dd:rlhaQe');
use vars qw($opt_D $opt_d $opt_r $opt_l $opt_h $opt_a $opt_Q $opt_e);
die "-r and -a options are mutually exclusive\n" if ($opt_r and $opt_a);
my @inc_dirs = inc_dirs() if $opt_a;

my $Exit = 0;

my $Dest_dir = $opt_d || $Config{installsitearch};
die "Destination directory $Dest_dir doesn't exist or isn't a directory\n"
unless -d $Dest_dir;

my @isatype = qw(
char uchar u_char
short ushort u_short
int uint u_int
long ulong u_long
FILE key_t caddr_t
float double size_t
);

my %isatype;
@isatype{@isatype} = (1) x @isatype;
my $inif = 0;
my %Is_converted;
my %bad_file = ();

@ARGV = ('-') unless @ARGV;

build_preamble_if_necessary();

sub reindent($) {
my($text) = shift;
$text =~ s/\n/\n /g;
$text =~ s/ /\t/g;
$text;
}

my ($t, $tab, %curargs, $new, $eval_index, $dir, $name, $args, $outfile);
my ($incl, $incl_type, $incl_quote, $next);
while (defined (my $file = next_file())) {
if (-l $file and -d $file) {
link_if_possible($file) if ($opt_l);
next;
}

# Recover from header files with unbalanced cpp directives
$t = '';
$tab = 0;

# $eval_index goes into '#line' directives, to help locate syntax errors:
$eval_index = 1;

if ($file eq '-') {
open(IN, "-");
open(OUT, ">-");
} else {
($outfile = $file) =~ s/\.h$/.ph/ || next;
print "$file -> $outfile\n" unless $opt_Q;
if ($file =~ m|^(.*)/|) {
$dir = $1;
mkpath "$Dest_dir/$dir";
}

if ($opt_a) { # automagic mode: locate header file in @inc_dirs
foreach (@inc_dirs) {
chdir $_;
last if -f $file;
}
}

open(IN, "<", "$file") || (($Exit = 1),(warn "Can't open $file: $!\n"),next);
open(OUT, ">", "$Dest_dir/$outfile") || die "Can't create $outfile: $!\n";
}

print OUT
"require '_h2ph_pre.ph';\n\n",
"no warnings qw(redefine misc);\n\n";

while (defined (local $_ = next_line($file))) {
if (s/^\s*\#\s*//) {
if (s/^define\s+(\w+)//) {
$name = $1;
$new = '';
s/\s+$//;
s/\(\w+\s*\(\*\)\s*\(\w*\)\)\s*(-?\d+)/$1/; # (int (*)(foo_t))0
if (s/^\(([\w,\s]*)\)//) {
$args = $1;
my $proto = '() ';
if ($args ne '') {
$proto = '';
foreach my $arg (split(/,\s*/,$args)) {
$arg =~ s/^\s*([^\s].*[^\s])\s*$/$1/;
$curargs{$arg} = 1;
}
$args =~ s/\b(\w)/\$$1/g;
$args = "my($args) = \@_;\n$t ";
}
s/^\s+//;
expr();
$new =~ s/(["\\])/\\$1/g; #"]);
EMIT($proto);
} else {
s/^\s+//;
expr();

$new = 1 if $new eq '';

# Shunt around such directives as '#define FOO FOO':
next if $new =~ /^\s*&\Q$name\E\s*\z/;

$new = reindent($new);
$args = reindent($args);
$new =~ s/(['\\])/\\$1/g; #']);

print OUT $t, 'eval ';
if ($opt_h) {
print OUT "\"\\n#line $eval_index $outfile\\n\" . ";
$eval_index++;
}
print OUT "'sub $name () {$new;}' unless defined(&$name);\n";
}
} elsif (/^(include|import|include_next)\s*([<\"])(.*)[>\"]/) {
$incl_type = $1;
$incl_quote = $2;
$incl = $3;
if (($incl_type eq 'include_next') ||
($opt_e && exists($bad_file{$incl}))) {
$incl =~ s/\.h$/.ph/;
print OUT ($t,
"eval {\n");
$tab += 4;
$t = "\t" x ($tab / 8) . ' ' x ($tab % 8);
print OUT ($t, "my(\@REM);\n");
if ($incl_type eq 'include_next') {
print OUT ($t,
"my(\%INCD) = map { \$INC{\$_} => 1 } ",
"(grep { \$_ eq \"$incl\" } ",
"keys(\%INC));\n");
print OUT ($t,
"\@REM = map { \"\$_/$incl\" } ",
"(grep { not exists(\$INCD{\"\$_/$incl\"})",
" and -f \"\$_/$incl\" } \@INC);\n");
} else {
print OUT ($t,
"\@REM = map { \"\$_/$incl\" } ",
"(grep {-r \"\$_/$incl\" } \@INC);\n");
}
print OUT ($t,
"require \"\$REM[0]\" if \@REM;\n");
$tab -= 4;
$t = "\t" x ($tab / 8) . ' ' x ($tab % 8);
print OUT ($t,
"};\n");
print OUT ($t,
"warn(\$\@) if \$\@;\n");
} else {
$incl =~ s/\.h$/.ph/;
# copy the prefix in the quote syntax (#include "x.h") case
if ($incl !~ m|/| && $incl_quote eq q{"} && $file =~ m|^(.*)/|) {
$incl = "$1/$incl";
}
print OUT $t,"require '$incl';\n";
}
} elsif (/^ifdef\s+(\w+)/) {
print OUT $t,"if(defined(&$1)) {\n";
$tab += 4;
$t = "\t" x ($tab / 8) . ' ' x ($tab % 8);
} elsif (/^ifndef\s+(\w+)/) {
print OUT $t,"unless(defined(&$1)) {\n";
$tab += 4;
$t = "\t" x ($tab / 8) . ' ' x ($tab % 8);
} elsif (s/^if\s+//) {
$new = '';
$inif = 1;
expr();
$inif = 0;
print OUT $t,"if($new) {\n";
$tab += 4;
$t = "\t" x ($tab / 8) . ' ' x ($tab % 8);
} elsif (s/^elif\s+//) {
$new = '';
$inif = 1;
expr();
$inif = 0;
$tab -= 4;
$t = "\t" x ($tab / 8) . ' ' x ($tab % 8);
print OUT $t,"}\n elsif($new) {\n";
$tab += 4;
$t = "\t" x ($tab / 8) . ' ' x ($tab % 8);
} elsif (/^else/) {
$tab -= 4;
$t = "\t" x ($tab / 8) . ' ' x ($tab % 8);
print OUT $t,"} else {\n";
$tab += 4;
$t = "\t" x ($tab / 8) . ' ' x ($tab % 8);
} elsif (/^endif/) {
$tab -= 4;
$t = "\t" x ($tab / 8) . ' ' x ($tab % 8);
print OUT $t,"}\n";
} elsif(/^undef\s+(\w+)/) {
print OUT $t, "undef(&$1) if defined(&$1);\n";
} elsif(/^error\s+(".*")/) {
print OUT $t, "die($1);\n";
} elsif(/^error\s+(.*)/) {
print OUT $t, "die(\"", quotemeta($1), "\");\n";
} elsif(/^warning\s+(.*)/) {
print OUT $t, "warn(\"", quotemeta($1), "\");\n";
} elsif(/^ident\s+(.*)/) {
print OUT $t, "# $1\n";
}
} elsif (/^\s*(typedef\s*)?enum\s*(\s+[a-zA-Z_]\w*\s*)?/) { # { for vi
until(/\{[^}]*\}.*;/ || /;/) {
last unless defined ($next = next_line($file));
chomp $next;
# drop "#define FOO FOO" in enums
$next =~ s/^\s*#\s*define\s+(\w+)\s+\1\s*$//;
# #defines in enums (aliases)
$next =~ s/^\s*#\s*define\s+(\w+)\s+(\w+)\s*$/$1 = $2,/;
$_ .= $next;
print OUT "# $next\n" if $opt_D;
}
s/#\s*if.*?#\s*endif//g; # drop #ifdefs
s@/\*.*?\*/@@g;
s/\s+/ /g;
next unless /^\s?(typedef\s?)?enum\s?([a-zA-Z_]\w*)?\s?\{(.*)\}\s?([a-zA-Z_]\w*)?\s?;/;
(my $enum_subs = $3) =~ s/\s//g;
my @enum_subs = split(/,/, $enum_subs);
my $enum_val = -1;
foreach my $enum (@enum_subs) {
my ($enum_name, $enum_value) = $enum =~ /^([a-zA-Z_]\w*)(=.+)?$/;
$enum_name or next;
$enum_value =~ s/^=//;
$enum_val = (length($enum_value) ? $enum_value : $enum_val + 1);
if ($opt_h) {
print OUT ($t,
"eval(\"\\n#line $eval_index $outfile\\n",
"sub $enum_name () \{ $enum_val; \}\") ",
"unless defined(\&$enum_name);\n");
++ $eval_index;
} else {
print OUT ($t,
"eval(\"sub $enum_name () \{ $enum_val; \}\") ",
"unless defined(\&$enum_name);\n");
}
}
} elsif (/^(?:__extension__\s+)?(?:extern|static)\s+(?:__)?inline(?:__)?\s+/
and !/;\s*$/ and !/{\s*}\s*$/)
{ # { for vi
# This is a hack to parse the inline functions in the glibc headers.
# Warning: massive kludge ahead. We suppose inline functions
# are mainly constructed like macros.
while (1) {
last unless defined ($next = next_line($file));
chomp $next;
undef $_, last if $next =~ /__THROW\s*;/
or $next =~ /^(__extension__|extern|static)\b/;
$_ .= " $next";
print OUT "# $next\n" if $opt_D;
last if $next =~ /^}|^{.*}\s*$/;
}
next if not defined; # because it's only a prototype
s/\b(__extension__|extern|static|(?:__)?inline(?:__)?)\b//g;
# violently drop #ifdefs
s/#\s*if.*?#\s*endif//g
and print OUT "# some #ifdef were dropped here -- fill in the blanks\n";
if (s/^(?:\w|\s|\*)*\s(\w+)\s*//) {
$name = $1;
} else {
warn "name not found"; next; # shouldn't occur...
}
my @args;
if (s/^\(([^()]*)\)\s*(\w+\s*)*//) {
for my $arg (split /,/, $1) {
if ($arg =~ /(\w+)\s*$/) {
$curargs{$1} = 1;
push @args, $1;
}
}
}
$args = (
@args
? "my(" . (join ',', map "\$$_", @args) . ") = \@_;\n$t "
: ""
);
my $proto = @args ? '' : '() ';
$new = '';
s/\breturn\b//g; # "return" doesn't occur in macros usually...
expr();
# try to find and perlify local C variables
our @local_variables = (); # needs to be a our(): (?{...}) bug workaround
{
use re "eval";
my $typelist = join '|', keys %isatype;
$new =~ s['
(?:(?:__)?const(?:__)?\s+)?
(?:(?:un)?signed\s+)?
(?:long\s+)?
(?:$typelist)\s+
(\w+)
(?{ push @local_variables, $1 })
']
[my \$$1]gx;
$new =~ s['
(?:(?:__)?const(?:__)?\s+)?
(?:(?:un)?signed\s+)?
(?:long\s+)?
(?:$typelist)\s+
' \s+ &(\w+) \s* ;
(?{ push @local_variables, $1 })
]
[my \$$1;]gx;
}
$new =~ s/&$_\b/\$$_/g for @local_variables;
$new =~ s/(["\\])/\\$1/g; #"]);
# now that's almost like a macro (we hope)
EMIT($proto);
}
}
$Is_converted{$file} = 1;
if ($opt_e && exists($bad_file{$file})) {
unlink($Dest_dir . '/' . $outfile);
$next = '';
} else {
print OUT "1;\n";
queue_includes_from($file) if $opt_a;
}
}

if ($opt_e && (scalar(keys %bad_file) > 0)) {
warn "Was unable to convert the following files:\n";
warn "\t" . join("\n\t",sort(keys %bad_file)) . "\n";
}

exit $Exit;

sub EMIT {
my $proto = shift;

$new = reindent($new);
$args = reindent($args);
if ($t ne '') {
$new =~ s/(['\\])/\\$1/g; #']);
if ($opt_h) {
print OUT $t,
"eval \"\\n#line $eval_index $outfile\\n\" . 'sub $name $proto\{\n$t ${args}eval q($new);\n$t}' unless defined(\&$name);\n";
$eval_index++;
} else {
print OUT $t,
"eval 'sub $name $proto\{\n$t ${args}eval q($new);\n$t}' unless defined(\&$name);\n";
}
} else {
print OUT "unless(defined(\&$name)) {\n sub $name $proto\{\n\t${args}eval q($new);\n }\n}\n";
}
%curargs = ();
return;
}

sub expr {
if (/\b__asm__\b/) { # freak out
$new = '"(assembly code)"';
return
}
my $joined_args;
if(keys(%curargs)) {
$joined_args = join('|', keys(%curargs));
}
while ($_ ne '') {
s/^\&\&// && do { $new .= " &&"; next;}; # handle && operator
s/^\&([\(a-z\)]+)/$1/i; # hack for things that take the address of
s/^(\s+)// && do {$new .= ' '; next;};
s/^0X([0-9A-F]+)[UL]*//i
&& do {my $hex = $1;
$hex =~ s/^0+//;
if (length $hex > 8 && !$Config{use64bitint}) {
# Croak if nv_preserves_uv_bits < 64 ?
$new .= hex(substr($hex, -8)) +
2**32 * hex(substr($hex, 0, -8));
# The above will produce "erroneous" code
# if the hex constant was e.g. inside UINT64_C
# macro, but then again, h2ph is an approximation.
} else {
$new .= lc("0x$hex");
}
next;};
s/^(-?\d+\.\d+E[-+]?\d+)[FL]?//i && do {$new .= $1; next;};
s/^(\d+)\s*[LU]*//i && do {$new .= $1; next;};
s/^("(\\"|[^"])*")// && do {$new .= $1; next;};
s/^'((\\"|[^"])*)'// && do {
if ($curargs{$1}) {
$new .= "ord('\$$1')";
} else {
$new .= "ord('$1')";
}
next;
};
# replace "sizeof(foo)" with "{foo}"
# also, remove * (C dereference operator) to avoid perl syntax
# problems. Where the %sizeof array comes from is anyone's
# guess (c2ph?), but this at least avoids fatal syntax errors.
# Behavior is undefined if sizeof() delimiters are unbalanced.
# This code was modified to able to handle constructs like this:
# sizeof(*(p)), which appear in the HP-UX 10.01 header files.
s/^sizeof\s*\(// && do {
$new .= '$sizeof';
my $lvl = 1; # already saw one open paren
# tack { on the front, and skip it in the loop
$_ = "{" . "$_";
my $index = 1;
# find balanced closing paren
while ($index <= length($_) && $lvl > 0) {
$lvl++ if substr($_, $index, 1) eq "(";
$lvl-- if substr($_, $index, 1) eq ")";
$index++;
}
# tack } on the end, replacing )
substr($_, $index - 1, 1) = "}";
# remove pesky * operators within the sizeof argument
substr($_, 0, $index - 1) =~ s/\*//g;
next;
};
# Eliminate typedefs
/\(([\w\s]+)[\*\s]*\)\s*[\w\(]/ && do {
my $doit = 1;
foreach (split /\s+/, $1) { # Make sure all the words are types,
unless($isatype{$_} or $_ eq 'struct' or $_ eq 'union'){
$doit = 0;
last;
}
}
if( $doit ){
s/\([\w\s]+[\*\s]*\)// && next; # then eliminate them.
}
};
# struct/union member, including arrays:
s/^([_A-Z]\w*(\[[^\]]+\])?((\.|->)[_A-Z]\w*(\[[^\]]+\])?)+)//i && do {
my $id = $1;
$id =~ s/(\.|(->))([^\.\-]*)/->\{$3\}/g;
$id =~ s/\b([^\$])($joined_args)/$1\$$2/g if length($joined_args);
while($id =~ /\[\s*([^\$\&\d\]]+)\]/) {
my($index) = $1;
$index =~ s/\s//g;
if(exists($curargs{$index})) {
$index = "\$$index";
} else {
$index = "&$index";
}
$id =~ s/\[\s*([^\$\&\d\]]+)\]/[$index]/;
}
$new .= " (\$$id)";
};
s/^([_a-zA-Z]\w*)// && do {
my $id = $1;
if ($id eq 'struct' || $id eq 'union') {
s/^\s+(\w+)//;
$id .= ' ' . $1;
$isatype{$id} = 1;
} elsif ($id =~ /^((un)?signed)|(long)|(short)$/) {
while (s/^\s+(\w+)//) { $id .= ' ' . $1; }
$isatype{$id} = 1;
}
if ($curargs{$id}) {
$new .= "\$$id";
$new .= '->' if /^[\[\{]/;
} elsif ($id eq 'defined') {
$new .= 'defined';
} elsif (/^\s*\(/) {
s/^\s*\((\w),/("$1",/ if $id =~ /^_IO[WR]*$/i; # cheat
$new .= " &$id";
} elsif ($isatype{$id}) {
if ($new =~ /\{\s*$/) {
$new .= "'$id'";
} elsif ($new =~ /\(\s*$/ && /^[\s*]*\)/) {
$new =~ s/\(\s*$//;
s/^[\s*]*\)//;
} else {
$new .= q(').$id.q(');
}
} else {
if ($inif) {
if ($new =~ /defined\s*$/) {
$new .= '(&' . $id . ')';
} elsif ($new =~ /defined\s*\($/) {
$new .= '&' . $id;
} else {
$new .= '(defined(&' . $id . ') ? &' . $id . ' : undef)';
}
} elsif (/^\[/) {
$new .= " \$$id";
} else {
$new .= ' &' . $id;
}
}
next;
};
s/^(.)// && do { if ($1 ne '#') { $new .= $1; } next;};
}
}


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 = 4;
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";
# Prevent non-portable hex constants from warning.
#
# We still produce an overflow warning if we can't represent
# a hex constant as an integer.
print PREAMBLE "no warnings qw(portable);\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{$_} =~ /^([+-]?0x[\da-f]+)U?L{0,2}$/i) {
# hex integer
# Special cased, since perl warns on hex integers
# that can't be represented in a UV.
#
# This way we get the warning at time of use, so the user
# only gets the warning if they happen to use this
# platform-specific definition.
my $code = $1;
$code = "hex('$code')" if length $code > 10;
print PREAMBLE
"unless (defined &$_) { sub $_() { $code } }\n\n";
} elsif ($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'};

# If optimizing -O2 is used, add the definition
if ($Config{'ccflags'} =~ /(?:\s+|^)-O([\d]+)(?:\s+|$)/) {
$allsymbols .= " __OPTIMIZE__=$1";
}

# 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;

##############################################################################
__END__

=head1 NAME

h2ph - convert .h C header files to .ph Perl header files

=head1 SYNOPSIS

B<h2ph [-d destination directory] [-r | -a] [-l] [-h] [-e] [-D] [-Q]
[headerfiles]>

=head1 DESCRIPTION

I<h2ph>
converts any C header files specified to the corresponding Perl header file
format.
It is most easily run while in /usr/include:

cd /usr/include; h2ph * sys/*

or

cd /usr/include; h2ph * sys/* arpa/* netinet/*

or

cd /usr/include; h2ph -r -l .

The output files are placed in the hierarchy rooted at Perl's
architecture dependent library directory. You can specify a different
hierarchy with a B<-d> switch.

If run with no arguments, filters standard input to standard output.

=head1 OPTIONS

=over 4

=item -d destination_dir

Put the resulting B<.ph> files beneath B<destination_dir>, instead of
beneath the default Perl library location (C<$Config{'installsitearch'}>).

=item -r

Run recursively; if any of B<headerfiles> are directories, then run I<h2ph>
on all files in those directories (and their subdirectories, etc.). B<-r>
and B<-a> are mutually exclusive.

=item -a

Run automagically; convert B<headerfiles>, as well as any B<.h> files
which they include. This option will search for B<.h> files in all
directories which your C compiler ordinarily uses. B<-a> and B<-r> are
mutually exclusive.

=item -l

Symbolic links will be replicated in the destination directory. If B<-l>
is not specified, then links are skipped over.

=item -h

Put 'hints' in the .ph files which will help in locating problems with
I<h2ph>. In those cases when you B<require> a B<.ph> file containing syntax
errors, instead of the cryptic

[ some error condition ] at (eval mmm) line nnn

you will see the slightly more helpful

[ some error condition ] at filename.ph line nnn

However, the B<.ph> files almost double in size when built using B<-h>.

=item -e

If an error is encountered during conversion, output file will be removed and
a warning emitted instead of terminating the conversion immediately.

=item -D

Include the code from the B<.h> file as a comment in the B<.ph> file.
This is primarily used for debugging I<h2ph>.

=item -Q

'Quiet' mode; don't print out the names of the files being converted.

=back

=head1 ENVIRONMENT

No environment variables are used.

=head1 FILES

/usr/include/*.h
/usr/include/sys/*.h

etc.

=head1 AUTHOR

Larry Wall

=head1 SEE ALSO

perl(1)

=head1 DIAGNOSTICS

The usual warnings if it can't read or write the files involved.

=head1 BUGS

Doesn't construct the %sizeof array for you.

It doesn't handle all C constructs, but it does attempt to isolate
definitions inside evals so that you can get at the definitions
that it can translate.

It's only intended as a rough tool.
You may need to dicker with the files produced.

You have to run this program by hand; it's not run as part of the Perl
installation.

Doesn't handle complicated expressions built piecemeal, a la:

enum {
FIRST_VALUE,
SECOND_VALUE,
#ifdef ABC
THIRD_VALUE
#endif
};

Doesn't necessarily locate all of your C compiler's internally-defined
symbols.

=cut