log.h

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/*
 * Copyright (C) 2015 Kaspar Schleiser <kaspar@schleiser.de>
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */

#ifndef LOG_H
#define LOG_H

#ifdef __cplusplus
 extern "C" {
#endif

enum {
    LOG_NONE,       
    LOG_ERROR,      
    LOG_WARNING,    
    LOG_INFO,       
    LOG_DEBUG,      
    LOG_ALL         
};

#ifndef LOG_LEVEL

#define LOG_LEVEL LOG_INFO
#endif

#ifdef __clang__    /* following pragmas required for clang 3.8.0 */
#define LOG(level, ...) do { \
    _Pragma("clang diagnostic push") \
    _Pragma("clang diagnostic ignored \"-Wtautological-compare\"") \
    if ((level) <= LOG_LEVEL) log_write((level), __VA_ARGS__); } while (0U) \
    _Pragma("clang diagnostic pop")
#else
#define LOG(level, ...) do { \
    if ((level) <= LOG_LEVEL) log_write((level), __VA_ARGS__); } while (0U)
#endif /* __clang__ */

#define LOG_ERROR(...) LOG(LOG_ERROR, __VA_ARGS__)
#define LOG_WARNING(...) LOG(LOG_WARNING, __VA_ARGS__)
#define LOG_INFO(...) LOG(LOG_INFO, __VA_ARGS__)
#define LOG_DEBUG(...) LOG(LOG_DEBUG, __VA_ARGS__)

#ifdef MODULE_LOG
#include "log_module.h"
#else
#include <stdio.h>

#define log_write(level, ...) printf(__VA_ARGS__)
#endif

#ifdef __cplusplus
}
#endif

#endif /* LOG_H */