logging.h

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#include <stdarg.h>
 
// To silence warnings about a function being a candidate for format checking
// with gcc, add an attribute.
// The arguments are the position of the format string (starting with 1)
// and the start of the remaining arguments, or 0 for vprintf style functions.
#if defined(__GNUC__)
#define ATTRIBUTE_FORMAT_PRINTF(f, s) __attribute__((format(printf, f, s)))
#else
#define ATTRIBUTE_FORMAT_PRINTF(f, s)
#endif

#define LOG_LEVEL_ERROR 0

#define LOG_LEVEL_WARNING 1

#define LOG_LEVEL_INFO 2

#define LOG_LEVEL_LOG 3

#define LOG_LEVEL_DEBUG 4

#define LOG_LEVEL_ALL 255

void lf_print(const char* format, ...) ATTRIBUTE_FORMAT_PRINTF(1, 2);

void lf_print_log(const char* format, ...) ATTRIBUTE_FORMAT_PRINTF(1, 2);

void lf_print_debug(const char* format, ...) ATTRIBUTE_FORMAT_PRINTF(1, 2);

void lf_print_error(const char* format, ...) ATTRIBUTE_FORMAT_PRINTF(1, 2);

void lf_print_warning(const char* format, ...) ATTRIBUTE_FORMAT_PRINTF(1, 2);

void lf_print_error_and_exit(const char* format, ...) ATTRIBUTE_FORMAT_PRINTF(1, 2);

void lf_print_error_system_failure(const char* format, ...);

typedef void(print_message_function_t)(const char*, va_list);

void lf_register_print_function(print_message_function_t* function, int log_level);