#ifndef __DBG_H__
#define __DBG_H__

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>


#ifndef _FILENAME
#define _FILENAME __FILE__
#endif

/* helper functions which help in replacing the GNU extension ##__VA_ARGS__ */
#define STRINGIFY(x) #x
#define LOG_HELPER(f,l,...) fprintf(stderr, "("f":"STRINGIFY(l)"): "__VA_ARGS__)
#define FATAL_HELPER(M, ...) log_err(M ": %s\n", __VA_ARGS__)
#define FATAL_HELPER_(f,l,M,...) \
    fprintf(stderr, "(%s:%u): " M ": %s\n", f, l, __VA_ARGS__)

#ifdef NDEBUG
#define debug(...)
#else
#define debug(...) log_err(__VA_ARGS__)
#endif

#define log_err(...) LOG_HELPER(_FILENAME, __LINE__, __VA_ARGS__)
#define fatal(...) \
    {FATAL_HELPER(__VA_ARGS__, strerror(errno)); exit(EXIT_FAILURE);}
#define fatal_(f,l,...) \
    {FATAL_HELPER_(f, l, __VA_ARGS__, strerror(errno)); exit(EXIT_FAILURE);}

#endif