/* See LICENSE file for copyright and license details. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "util.h"

#define RESULT_SZ 255

int
main(int argc, char *argv[])
{
	int i;
	struct tm *now_tm = NULL;
	time_t now = 0;
	char *opt_fmt = "%c";
	char *opt_now = NULL;
	char result[RESULT_SZ];

	if (argc > 1)
		for (i = 1; i < argc; i++) {
			if (!strncmp("+", argv[i], 1))
				opt_fmt = argv[i] + 1;
			else if (!strcmp("-d", argv[i]) && ++i < argc)
				opt_now = argv[i];
			else
				eprintf("usage: %s [-d NOW] [+FORMAT]\n", argv[0]);
		}

	if (opt_now != NULL)
		now = atoi(opt_now);
	else
		now = time(NULL);
	now_tm = gmtime(&now);
	if (now_tm == NULL)
		eprintf("gmtime\n");

	strftime(result, RESULT_SZ, opt_fmt, now_tm);
	printf("%s\n", result);

	return EXIT_SUCCESS;
}