/*	$Id: logrotate.c,v 1.2 2007/05/07 19:32:36 dmitri Exp $	*/

/*
 * Copyright (c) 2007 Dmitri Alenitchev <dma@dma.org.ru>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <time.h>
#include <unistd.h>

extern char *__progname;

__dead void usage(void);

int
main(int argc, char** argv)
{
	time_t tval;
	int ch;
	char buf[1024], file[FILENAME_MAX], *format;

	format = "%Y_%m_%d";

	while ((ch = getopt(argc, argv, "f:")) != -1)
		switch (ch) {
		case 'f':
			format = optarg;
			break;
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if (argc == 0)
		usage();

	(void)time(&tval);
	(void)strftime(buf, sizeof(buf), format, localtime(&tval));

	(void)strlcpy(file, argv[0], sizeof(file));
	(void)strlcat(file, ".", sizeof(file));
	(void)strlcat(file, buf, sizeof(file));

	if (rename(argv[0], file)) {
		perror(__progname);
		exit(1);
	}

	exit(0);
}

__dead void
usage(void)
{
	(void)fprintf(stderr,
	    "usage: %s [-f format] filename\n", __progname);
	exit(1);
}