distrib/utils/h2ph.PL

#!/usr/local/bin/perl

use Config;
use File::Basename qw(basename dirname);
use Cwd;

# List explicitly here the variables you want Configure to
# generate.  Metaconfig only looks for shell variables, so you
# have to mention them as if they were shell variables, not
# %Config entries.  Thus you write
#  $startperl
# to ensure Configure will look for $Config{startperl}.
# Wanted:  $archlibexp

# This forces PL files to create target in same directory as PL file.
# This is so that make depend always knows where to find PL derivatives.
$origdir = cwd;
chdir dirname($0);
$file = basename($0, '.PL');
$file .= '.com' if $^O eq 'VMS';

open OUT,">$file" or die "Can't create $file: $!";

print "Extracting $file (with variable substitutions)\n";

# In this section, perl variables will be expanded during extraction.
# You can use $Config{...} to use Configure variables.

print OUT <<"!GROK!THIS!";
$Config{startperl}
    eval 'exec $Config{perlpath} -S \$0 \${1+"\$@"}'
    if \$running_under_some_shell;
!GROK!THIS!

# In the following, perl variables are not expanded during extraction.

print OUT <<'!NO!SUBS!';

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 = split(' ',<<END);
    char    uchar   u_char
    short   ushort  u_short
    int uint    u_int
    long    ulong   u_long
    FILE    key_t   caddr_t
END

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, $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 'redefine';\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;
            $args = "local($args) = \@_;\n$t    ";
            }
            s/^\s+//;
            expr();
            $new =~ s/(["\\])/\\$1/g;       #"]);
            $new = reindent($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 = ();
        } else {
            s/^\s+//;
            expr();
            $new = 1 if $new eq '';
            $new = reindent($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 $name () {",$new,";}' unless defined(\&$name);\n";
                $eval_index++;
            } else {
                print OUT $t,"eval 'sub $name () {",$new,";}' unless defined(\&$name);\n";
            }
            } else {
                # Shunt around such directives as `#define FOO FOO':
                next if " \&$name" eq $new;

                      print OUT $t,"unless(defined(\&$name)) {\n    sub $name () {\t",$new,";}\n}\n";
            }
        }
        } elsif (/^(include|import|include_next)\s*[<\"](.*)[>\"]/) {
                $incl_type = $1;
                $incl = $2;
                if (($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/;
            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, "# $1\n";
        }
    } elsif(/^\s*(typedef\s*)?enum\s*(\s+[a-zA-Z_]\w*\s*)?/) {
        until(/\{[^}]*\}.*;/ || /;/) {
        last unless defined ($next = next_line($file));
        chomp $next;
        # drop "#define FOO FOO" in enums
        $next =~ s/^\s*#\s*define\s+(\w+)\s+\1\s*$//;
        $_ .= $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_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");
        }
        }
    }
    }
    $Is_converted{$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 expr {
    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 "errorneus" 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 {
        foreach (split /\s+/, $1) {  # Make sure all the words are types,
        last unless ($isatype{$_} or $_ eq 'struct' or $_ eq 'union');
        }
        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 && $new !~ /defined\s*\($/) {
            $new .= '(defined(&' . $id . ') ? &' . $id . ' : 0)';
        } 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/;
        }
        next READ;
        }
        if ($in =~ /^extern inline / && # Inlined assembler.
        $^O eq 'linux' && $file =~ m!(?:^|/)asm/[^/]+\.h$!) {
        while (<IN>) {
            last if /^}/;
        }
        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+<(.*?)>/) {
                push(@ARGV, $1) unless $Is_converted{$1};
            }
        }
    close HEADER;
}


# Determine include directories; $Config{usrinc} should be enough for (all
# non-GCC?) C compilers, but gcc uses an additional include directory.
sub inc_dirs
{
    my $from_gcc    = `$Config{cc} -v 2>&1`;
    $from_gcc       =~ s:^Reading specs from (.*?)/specs\b.*:$1/include:s;

    length($from_gcc) ? ($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     = 2;
    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 ($define{$_} =~ /^(\d+)U?L{0,2}$/i) {
                print PREAMBLE
                    "unless (defined &$_) { sub $_() { $1 } }\n\n";
            } elsif ($define{$_} =~ /^\w+$/) {
                print PREAMBLE
                    "unless (defined &$_) { sub $_() { &$define{$_} } }\n\n";
            } else {
                print PREAMBLE
                    "unless (defined &$_) { sub $_() { \"",
                    quotemeta($define{$_}), "\" } }\n\n";
            }
        }
    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:
    foreach (split /\s+/, $allsymbols) {
        /(.+?)=(.+)/ and $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] [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{'installsitsearch'}>).

=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 -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

!NO!SUBS!

close OUT or die "Can't close $file: $!";
chmod 0755, $file or die "Can't reset permissions for $file: $!\n";
exec("$Config{'eunicefix'} $file") if $Config{'eunicefix'} ne ':';
chdir $origdir;