/*
 * Copyright (C) 2012 Andrew Ayer
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Except as contained in this notice, the name(s) of the above copyright
 * holders shall not be used in advertising or otherwise to promote the
 * sale, use or other dealings in this Software without prior written
 * authorization.
 */
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <utime.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>

int main (int argc, const char** argv)
{
	int			exit_code = 0;
	time_t			offset;
	int			i;

	if (argc < 3) {
		fprintf(stderr, "Usage: %s OFFSET FILE ...\n", argv[0]);
		return 2;
	}

	offset = atol(argv[1]);

	for (i = 2; i < argc; ++i) {
		struct stat	status;
		struct utimbuf	times;

		if (stat(argv[i], &status) == -1) {
			fprintf(stderr, "%s: %s: %s", argv[0], argv[i], strerror(errno));
			exit_code |= 4;
			continue;
		}

		times.actime = status.st_atime;
		times.modtime = status.st_mtime + offset;

		if (utime(argv[i], &times) == -1) {
			fprintf(stderr, "%s: %s: Failed to set utimes: %s", argv[0], argv[i], strerror(errno));
			exit_code |= 8;
			continue;
		}
	}

	return exit_code;
}