/* SPDX-License-Identifier: LGPL-2.1+ */
/***
  This file is part of systemd.

  Copyright 2010 Lennart Poettering

  systemd 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.

  systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <string.h>
#include <syslog.h>

#include "hexdecoct.h"
#include "macro.h"
#include "string-table.h"
#include "syslog-util.h"

int syslog_parse_priority(const char **p, int *priority, bool with_facility) {
        int a = 0, b = 0, c = 0;
        int k;

        assert(p);
        assert(*p);
        assert(priority);

        if ((*p)[0] != '<')
                return 0;

        if (!strchr(*p, '>'))
                return 0;

        if ((*p)[2] == '>') {
                c = undecchar((*p)[1]);
                k = 3;
        } else if ((*p)[3] == '>') {
                b = undecchar((*p)[1]);
                c = undecchar((*p)[2]);
                k = 4;
        } else if ((*p)[4] == '>') {
                a = undecchar((*p)[1]);
                b = undecchar((*p)[2]);
                c = undecchar((*p)[3]);
                k = 5;
        } else
                return 0;

        if (a < 0 || b < 0 || c < 0 ||
            (!with_facility && (a || b || c > 7)))
                return 0;

        if (with_facility)
                *priority = a*100 + b*10 + c;
        else
                *priority = (*priority & LOG_FACMASK) | c;

        *p += k;
        return 1;
}

static const char *const log_facility_unshifted_table[LOG_NFACILITIES] = {
        [LOG_FAC(LOG_KERN)] = "kern",
        [LOG_FAC(LOG_USER)] = "user",
        [LOG_FAC(LOG_MAIL)] = "mail",
        [LOG_FAC(LOG_DAEMON)] = "daemon",
        [LOG_FAC(LOG_AUTH)] = "auth",
        [LOG_FAC(LOG_SYSLOG)] = "syslog",
        [LOG_FAC(LOG_LPR)] = "lpr",
        [LOG_FAC(LOG_NEWS)] = "news",
        [LOG_FAC(LOG_UUCP)] = "uucp",
        [LOG_FAC(LOG_CRON)] = "cron",
        [LOG_FAC(LOG_AUTHPRIV)] = "authpriv",
        [LOG_FAC(LOG_FTP)] = "ftp",
        [LOG_FAC(LOG_LOCAL0)] = "local0",
        [LOG_FAC(LOG_LOCAL1)] = "local1",
        [LOG_FAC(LOG_LOCAL2)] = "local2",
        [LOG_FAC(LOG_LOCAL3)] = "local3",
        [LOG_FAC(LOG_LOCAL4)] = "local4",
        [LOG_FAC(LOG_LOCAL5)] = "local5",
        [LOG_FAC(LOG_LOCAL6)] = "local6",
        [LOG_FAC(LOG_LOCAL7)] = "local7"
};

DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(log_facility_unshifted, int, LOG_FAC(~0));

bool log_facility_unshifted_is_valid(int facility) {
        return facility >= 0 && facility <= LOG_FAC(~0);
}

static const char *const log_level_table[] = {
        [LOG_EMERG] = "emerg",
        [LOG_ALERT] = "alert",
        [LOG_CRIT] = "crit",
        [LOG_ERR] = "err",
        [LOG_WARNING] = "warning",
        [LOG_NOTICE] = "notice",
        [LOG_INFO] = "info",
        [LOG_DEBUG] = "debug"
};

DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(log_level, int, LOG_DEBUG);

bool log_level_is_valid(int level) {
        return level >= 0 && level <= LOG_DEBUG;
}