ppd/include/logger.h

#pragma once
#include <stdio.h>

#ifdef __cplusplus
extern "C" {
#define LOGGER_VAR_DECL extern "C" { unsigned int logger_verbosity = 0; }
#else
#define LOGGER_VAR_DECL unsigned int logger_verbosity = 0
#endif

extern unsigned int logger_verbosity;

static inline void
logger_set_verbosity(unsigned int v)
{
	logger_verbosity = v;
}

static inline unsigned int
logger_get_verbosity(void)
{
	return logger_verbosity;
}

#define DEBUG_VERBOSITY (2)
#define INFO_VERBOSITY (1)

#define W(fmt, ...)                                                             \
	do {                                                                    \
		fprintf(stderr, "[WARNING] %s: " fmt, __func__, ##__VA_ARGS__); \
	} while (0)

#define E(fmt, ...)                                                           \
	do {                                                                  \
		fprintf(stderr, "[ERROR] %s: " fmt, __func__, ##__VA_ARGS__); \
		exit(1);                                                      \
	} while (0)

#define V(fmt, ...)                                                                  \
	do {                                                                         \
		if (logger_get_verbosity() >= INFO_VERBOSITY) {                      \
			fprintf(stdout, "[INFO] %s: " fmt, __func__, ##__VA_ARGS__); \
		}                                                                    \
	} while (0)

#define D(fmt, ...)                                                                   \
	do {                                                                          \
		if (logger_get_verbosity() >= DEBUG_VERBOSITY) {                      \
			fprintf(stdout, "[DEBUG] %s: " fmt, __func__, ##__VA_ARGS__); \
		}                                                                     \
	} while (0)

#ifdef __cplusplus
}
#endif