/*
 * Copyright (c) 2024 DTB <trinity@trinity.moe>
 * SPDX-License-Identifier: AGPL-3.0-or-later
 *
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option) any
 * later version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see https://www.gnu.org/licenses/.
 */

#include <errno.h> /* EACCESS, ELOOP, ENAMETOOLONG, ENOENT, ENOTDIR, errno */
#include <stdio.h> /* fprintf(3), stderr */
#include <string.h> /* strerror(3) */
#include <sysexits.h> /* EX_OSERR, EX_NOPERM, EX_NOINPUT, EX_UNAVAILABLE,
                       * EX_USAGE */
#include <unistd.h> /* chdir(2) */

char *program_name = "pschdir";

int main(int argc, char *argv[]){
	if (argc < 3) {
		fprintf(stderr, "Usage: %s directory command [argument...]\n",
			argv[0] == NULL ? program_name : argv[0]);
		return EX_USAGE;
	}

	if(chdir(argv[1]) != 0){
		fprintf(stderr, "%s: %s: %s\n", argv[0], argv[1], strerror(errno));

		switch (errno) {
			case ENAMETOOLONG:	return EX_OSERR;
			case EACCES:      	return EX_NOPERM;
			case ENOENT:
			case ENOTDIR:     	return EX_NOINPUT;
			default:          	return EX_UNAVAILABLE;
		}
	}

	execvp(argv[2], &argv[2]);
}