# Expand a list of selected hashes to a list of enabled hashes, using

# the information in hashes.lst.

#

#   Copyright 2018 Zack Weinberg

#

#   This library is free software; you can redistribute it and/or

#    modify it under the terms of the GNU Lesser General Public License

#   as published by the Free Software Foundation; either version 2.1 of

#   the License, or (at your option) any later version.

#

#   This library is distributed in the hope that it will be useful,

#   but WITHOUT ANY WARRANTY; without even the implied warranty of

#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

#   GNU Lesser General Public License for more details.

#

#   You should have received a copy of the GNU Lesser General Public

#   License along with this library; if not, see

#   <https://www.gnu.org/licenses/>.

BEGIN {

    enable_all      = 0

    enable_strong   = 0

    enable_glibc    = 0

    enable_freebsd  = 0

    enable_netbsd   = 0

    enable_openbsd  = 0

    enable_osx      = 0

    enable_solaris  = 0

    error = 0

    split(SELECTED_HASHES, selected_hashes_list, ",")

    for (i in selected_hashes_list) {

        h = selected_hashes_list[i]

        if (h == "all") {

            enable_all = 1

        } else if (h == "strong") {

            enable_strong = 1

        } else if (h == "glibc") {

            enable_glibc = 1

        } else if (h == "freebsd") {

            enable_freebsd = 1

        } else if (h == "netbsd") {

            enable_netbsd = 1

        } else if (h == "openbsd") {

            enable_openbsd = 1

        } else if (h == "osx") {

            enable_osx = 1

        } else if (h == "solaris") {

            enable_solaris = 1

        } else {

            enable_some = 1

            selected_hashes[h] = 1

        }

    }

    if (enable_all && (enable_strong  || enable_glibc  || enable_some    || \

                       enable_freebsd || enable_netbsd || enable_openbsd || \

                       enable_osx     || enable_solaris)) {

        error = 1

        exit 1

    }

}

/^#/ {

    next

}

{

    if (enable_all || $1 in selected_hashes) {

        enabled_hashes[$1] = 1

    } else {

        enabled_hashes[$1] = 0

        split($5, flags, ",")

        for (i in flags) {

            flag = flags[i]

            if (flag == "STRONG" && enable_strong) {

                enabled_hashes[$1] = 1

            } else if (flag == "GLIBC" && enable_glibc) {

                enabled_hashes[$1] = 1

            } else if (flag == "FREEBSD" && enable_freebsd) {

                enabled_hashes[$1] = 1

            } else if (flag == "NETBSD" && enable_netbsd) {

                enabled_hashes[$1] = 1

            } else if (flag == "OPENBSD" && enable_openbsd) {

                enabled_hashes[$1] = 1

            } else if (flag == "OSX" && enable_osx) {

                enabled_hashes[$1] = 1

            } else if (flag == "SOLARIS" && enable_solaris) {

                enabled_hashes[$1] = 1

            }

        }

    }

}

END {

    if (error) {

        exit 1

    }

    # Check for individual selected hashes that didn't appear in

    # hashes.lst.

    for (h in selected_hashes) {

        if (!(h in enabled_hashes)) {

            exit 1

        }

    }

    enabled_hash_list = ","

    for (i in enabled_hashes) {

        if (enabled_hashes[i]) {

            enabled_hash_list = enabled_hash_list i ","

        }

    }

    print enabled_hash_list

}