/***
  This file is part of eudev, forked from 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/>.
***/

#pragma once

#include <stdbool.h>
#include <stdarg.h>
#include <syslog.h>
#include <errno.h>

#include "macro.h"

typedef enum LogTarget{
        LOG_TARGET_CONSOLE,
        LOG_TARGET_KMSG,
        LOG_TARGET_JOURNAL,
        LOG_TARGET_JOURNAL_OR_KMSG,
        LOG_TARGET_SYSLOG,
        LOG_TARGET_SYSLOG_OR_KMSG,
        LOG_TARGET_AUTO, /* console if stderr is tty, JOURNAL_OR_KMSG otherwise */
        LOG_TARGET_SAFE, /* console if stderr is tty, KMSG otherwise */
        LOG_TARGET_NULL,
        _LOG_TARGET_MAX,
        _LOG_TARGET_INVALID = -1
}  LogTarget;

void log_set_target(LogTarget target);
void log_set_max_level(int level);
int log_get_max_level(void) _pure_;

int log_open(void);
void log_close(void);

void log_close_syslog(void);
void log_close_journal(void);
void log_close_kmsg(void);
void log_close_console(void);

int log_internal(
                int level,
                int error,
                const char *file,
                int line,
                const char *func,
                const char *format, ...) _printf_(6,7);

int log_internalv(
                int level,
                int error,
                const char *file,
                int line,
                const char *func,
                const char *format,
                va_list ap) _printf_(6,0);

int log_oom_internal(
                const char *file,
                int line,
                const char *func);

/* Logging for various assertions */
noreturn void log_assert_failed(
                const char *text,
                const char *file,
                int line,
                const char *func);

noreturn void log_assert_failed_unreachable(
                const char *text,
                const char *file,
                int line,
                const char *func);


/* Logging with level */
#define log_full_errno(level, error, ...)                                         \
        ({                                                                        \
                int _l = (level), _e = (error);                                   \
                (log_get_max_level() >= _l)                                       \
                ? log_internal(_l, _e, __FILE__, __LINE__, __func__, __VA_ARGS__) \
                : -abs(_e); \
        })

#define log_full(level, ...) log_full_errno(level, 0, __VA_ARGS__)

/* Normal logging */
#define log_debug(...)     log_full(LOG_DEBUG,   __VA_ARGS__)
#define log_info(...)      log_full(LOG_INFO,    __VA_ARGS__)
#define log_notice(...)    log_full(LOG_NOTICE,  __VA_ARGS__)
#define log_warning(...)   log_full(LOG_WARNING, __VA_ARGS__)
#define log_error(...)     log_full(LOG_ERR,     __VA_ARGS__)
#define log_emergency(...) log_full(getpid() == 1 ? LOG_EMERG : LOG_ERR, __VA_ARGS__)

/* Logging triggered by an errno-like error */
#define log_debug_errno(error, ...)     log_full_errno(LOG_DEBUG,   error, __VA_ARGS__)
#define log_info_errno(error, ...)      log_full_errno(LOG_INFO,    error, __VA_ARGS__)
#define log_notice_errno(error, ...)    log_full_errno(LOG_NOTICE,  error, __VA_ARGS__)
#define log_warning_errno(error, ...)   log_full_errno(LOG_WARNING, error, __VA_ARGS__)
#define log_error_errno(error, ...)     log_full_errno(LOG_ERR,     error, __VA_ARGS__)
#define log_emergency_errno(error, ...) log_full_errno(getpid() == 1 ? LOG_EMERG : LOG_ERR, error, __VA_ARGS__)

#ifdef LOG_TRACE
#  define log_trace(...) log_debug(__VA_ARGS__)
#else
#  define log_trace(...) do {} while(0)
#endif

/* This modifies the buffer passed! */

#define log_oom() log_oom_internal(__FILE__, __LINE__, __func__)

const char *log_target_to_string(LogTarget target) _const_;
LogTarget log_target_from_string(const char *s) _pure_;