log.h

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#ifndef LOG_H
#define LOG_H
 
typedef enum {
    LOG_LEVEL_NOTSET = 0, 
    LOG_LEVEL_DEBUG = 10, 
    LOG_LEVEL_INFO =
        20, 
    LOG_LEVEL_WARNING = 30, 
    LOG_LEVEL_ERROR = 40,   
    LOG_LEVEL_CRITICAL = 50 
} LogLevel;
 
typedef void (*LogCallback)(LogLevel level, const char* tag,
                            const char* message);
 
__attribute__((format(printf, 3, 4))) void log_message(LogLevel level,
                                                       const char* tag,
                                                       const char* format, ...);
 
void log_set_callback(LogCallback callback);
 
void log_set_level(LogLevel level);
 
LogLevel log_get_level(void);
 
/* Helper macros for easier logging */
 
#define LOG_DEBUG(tag, ...) log_message(LOG_LEVEL_DEBUG, tag, __VA_ARGS__)
#define LOG_INFO(tag, ...) log_message(LOG_LEVEL_INFO, tag, __VA_ARGS__)
#define LOG_WARNING(tag, ...) log_message(LOG_LEVEL_WARNING, tag, __VA_ARGS__)
#define LOG_WARN(tag, ...) LOG_WARNING(tag, __VA_ARGS__)
#define LOG_ERROR(tag, ...) log_message(LOG_LEVEL_ERROR, tag, __VA_ARGS__)
#define LOG_CRITICAL(tag, ...) log_message(LOG_LEVEL_CRITICAL, tag, __VA_ARGS__)
 
#endif /* LOG_H */