#! /usr/bin/perl
# Written by Zack Weinberg <zackw at panix.com> in 2017 and 2021.
# To the extent possible under law, Zack Weinberg has waived all
# copyright and related or neighboring rights to this work.
#
# See https://creativecommons.org/publicdomain/zero/1.0/ for further
# details.

# Generate an ELF-style "symbol version script" from a .map.in file.
# See libcrypt.map.in for an explanation of the format of .map.in
# files.

use v5.14;    # implicit use strict, use feature ':5.14'
use warnings FATAL => 'all';
use utf8;
use open qw(:std :utf8);
no  if $] >= 5.022, warnings => 'experimental::re_strict';
use if $] >= 5.022, re       => 'strict';

use FindBin ();
use lib $FindBin::Bin;
use BuildCommon qw(
    parse_version_map_in
);

sub output {
    my ($symvers) = @_;
    my $basemap = $symvers->basemap;
    print "/* Generated from $basemap by ${FindBin::Script}.  "
        . "DO NOT EDIT.  */\n";

    my %symbols_for_ver;
    for my $sym (@{$symvers->symbols}) {
        next if !$sym->included;
        for my $v (@{$sym->versions}) {
            push @{$symbols_for_ver{$v}}, $sym->name;
        }
    }

    my $vp;
    for my $v (@{$symvers->versions}) {
        next unless exists $symbols_for_ver{$v};
        print "$v {\n  global:\n";
        for my $s (sort @{$symbols_for_ver{$v}}) {
            print "    $s;\n";
        }
        if (defined $vp) {
            print "} $vp;\n";
        } else {
            print "  local:\n    *;\n};\n";
        }
        $vp = $v;
    }
    close STDOUT or die "write error: $!\n";
    return;
}

#
# Main
#
exit 0 if eval {
    output(parse_version_map_in(@ARGV));
    1;
};

print {*STDERR} "${FindBin::Script}: $@";
exit 1;