log.c

#include "log.h"

#include <stdarg.h>

static const char *const VERBOSITY_DESCRS[] = {
	"FATAL: ",
	"ERROR: ",
	"WARNING: ",
	"INFO: ",
	"VERBOSE: ",
};

#ifndef LOG_DEFAULT_VERBOSITY
#define LOG_DEFAULT_VERBOSITY LOG_ERROR
#endif

static log_verbosity_t max_handled = LOG_DEFAULT_VERBOSITY;
static FILE *write_dest = NULL;

static inline void init_write_dest(void) {
	if (!write_dest)
		write_dest = stderr;
}

log_verbosity_t log_get_verbosity(void) {
	return max_handled;
}

void log_set_verbosity(log_verbosity_t max) {
	max_handled = max;
}

FILE *log_get_dest(void) {
	init_write_dest();
	return write_dest;
}

void log_set_dest(FILE *stream) {
	write_dest = stream;
}

int log_msg(log_verbosity_t verb, const char *format, ...) {
	init_write_dest();

	if(verb > max_handled)
		return 0;

	va_list ap;
	va_start(ap, format);
	// TODO: Log caller's name?
	fputs(VERBOSITY_DESCRS[verb], write_dest);
	int ret = vfprintf(write_dest, format, ap);
	va_end(ap);

	return ret;
}