#!/usr/bin/env python3
#
# librdkafka - Apache Kafka C library
#
# Copyright (c) 2018 Magnus Edenhill
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
#    this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

#
# Generate linker script to only expose symbols of the public API
#

import sys
import re


if __name__ == '__main__':

    funcs = list()
    last_line = ''

    for line in sys.stdin:
        if line.startswith('typedef'):
            last_line = line
            continue
        m = re.match(r'^(\S+.*\s+\**)?(rd_kafka_[\w_]+)\s*\([^)]', line)
        if m:
            sym = m.group(2)
            # Ignore static (unused) functions
            m2 = re.match(
                r'(RD_UNUSED|__attribute__\(\(unused\)\))',
                last_line)
            if not m2:
                funcs.append(sym)
            last_line = ''
        else:
            last_line = line

    # Special symbols not covered by above matches or not exposed in
    # the public header files.
    funcs.append('rd_ut_coverage_check')

    print('# Automatically generated by lds-gen.py - DO NOT EDIT')
    print('{\n global:')
    if len(funcs) == 0:
        print('    *;')
    else:
        for f in sorted(funcs):
            print('    %s;' % f)

        print('local:\n    *;')

    print('};')
