logging.h

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#pragma once

#define LEVEL_FATAL     1

#define LEVEL_CRITICAL  2

#define LEVEL_ERROR     3

#define LEVEL_WARNING   4

#define LEVEL_NOTICE    5

#define LEVEL_INFO      6

#define LEVEL_DEBUG     7

#define LEVEL_TRACE     8

#ifndef PRODUCTION

    #define log_fatal(fmt, ...) \
        logprint("%s %s:%d " fmt "\n", \
        logtime(), __FUNCTION__, __LINE__, ##__VA_ARGS__)

    #define log_critical(fmt, ...) \
        logprint("%s %s:%d " fmt "\n", \
        logtime(), __FUNCTION__, __LINE__, ##__VA_ARGS__)

    #define log_error(fmt, ...) \
        logprint("%s %s:%d " fmt "\n", \
        logtime(), __FUNCTION__, __LINE__, ##__VA_ARGS__)
        
    #define log_warning(fmt, ...)  if (loglevel >= LEVEL_WARNING)  \
        logprint("%s %s:%d " fmt "\n", logtime(), __FUNCTION__, \
        __LINE__, ##__VA_ARGS__)

    #define log_notice(fmt, ...)  if (loglevel >= LEVEL_NOTICE)  \
        logprint("%s %s:%d " fmt "\n", logtime(), __FUNCTION__, \
        __LINE__, ##__VA_ARGS__)

    #define log_info(fmt, ...)  if (loglevel >= LEVEL_INFO)  \
        logprint("%s %s:%d " fmt "\n", logtime(), __FUNCTION__, \
        __LINE__, ##__VA_ARGS__)

    #define log_debug(fmt, ...) if (loglevel >= LEVEL_DEBUG) \
        logprint("%s %s:%d " fmt "\n", logtime(), __FUNCTION__, \
        __LINE__, ##__VA_ARGS__)

    #define log_trace(fmt, ...) if (loglevel >= LEVEL_TRACE) \
        logprint("%s %s:%d " fmt "\n", logtime(), __FUNCTION__, \
        __LINE__, ##__VA_ARGS__)

#else

    #define log_fatal(fmt, ...) ;
    #define log_critical(fmt, ...) ;
    #define log_error(fmt, ...) ;
    #define log_warning(fmt, ...) ;
    #define log_notice(fmt, ...) ;
    #define log_info(fmt, ...) ;
    #define log_debug(fmt, ...) ;
    #define log_trace(fmt, ...) ;

#endif


#ifdef __cplusplus
extern "C" {
#endif

extern const int loglevel;

void logprint(const char *fmt, ...);

const char *logtime(void);

#ifdef __cplusplus
}
#endif