freebsd-dev/usr.bin/objformat/objformat.c

/*-
 * Copyright (c) 1998, Peter Wemm <peter@netplex.com.au>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD$
 */

#include <err.h>
#include <objformat.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int
main(int argc, char **argv)
{
	char objformat[32];
	char *path, *chunk;
	char *cmd, *newcmd = NULL;
	const char *objformat_path;

	if (getobjformat(objformat, sizeof objformat, &argc, argv) == -1)
		errx(1, "Invalid object format");

	cmd = strrchr(argv[0], '/');
	if (cmd != NULL)
		cmd++;
	else
		cmd = argv[0];

	if (strcmp(cmd, "objformat") == 0) {
		if (argc != 1) {
			fprintf(stderr, "usage: objformat\n");
			exit(1);
		}
		printf("%s\n", objformat);
		exit(0);
	}

	/* 'make world' glue */
	objformat_path = getenv("OBJFORMAT_PATH");
	if (objformat_path == NULL)
		objformat_path = "/usr/libexec";
	path = strdup(objformat_path);

	setenv("OBJFORMAT", objformat, 1);

	while ((chunk = strsep(&path, ":")) != NULL) {
		if (newcmd != NULL) {
			free(newcmd);
			newcmd = NULL;
		}
		asprintf(&newcmd, "%s/%s/%s", chunk, objformat, cmd);
		if (newcmd == NULL)
			err(1, "cannot allocate memory for new command");

		argv[0] = newcmd;
		execv(newcmd, argv);
	}
	err(1, "could not exec %s/%s in %s", objformat, cmd, objformat_path);
}