/*-
 * Copyright (c) 1999, 2000 Chris M. Costello 
 * 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.
 *
 *	$Id: fconv.c,v 1.6 2000/12/08 00:38:24 chris Exp $
 */

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

void	usage(void);

int
main(int argc, char **argv)
{
	char *nptr, *dst, *src, ch;

	dst = NULL;
	src = NULL;

	nptr = strrchr(*argv, '/');
	if (nptr != NULL)
		++nptr;
	else
		nptr = *argv;
	while ((ch = getopt(argc, argv, "MmDd")) != -1)
		switch (ch) {
			case 'M':
				nptr = "bsd2mac";
				break;
			case 'm':
				nptr = "mac2bsd";
				break;
			case 'D':
				nptr = "bsd2dos";
				break;
			case 'd':
				nptr = "dos2bsd";
				break;
			default:
				usage();
		}
	argc -= optind;
	argv += optind;

	switch (argc) {
		case 2:
			if (freopen(dst = argv[1], "w", stdout) == NULL)
				err(1, "%s", argv[1]);
		case 1:
			if (freopen(src = argv[0], "r", stdin) == NULL)
				err(1, "%s", argv[0]);
		case 0:
			break;
		default:
			usage();
	}

	if (strcmp(nptr, "mac2bsd") == 0)
		while ((ch = getchar()) != EOF) {
			if (ch == '\r')
				putchar('\n');
			else putchar(ch);
		}
	else if (strcmp(nptr, "bsd2mac") == 0)
		while ((ch = getchar()) != EOF) {
			if (ch == '\n')
				putchar('\r');
			else putchar(ch);
		}
	else if (strcmp(nptr, "dos2bsd") == 0)
		while ((ch = getchar()) != EOF) {
			if (ch != '\r')
				putchar(ch);
		}
	else if (strcmp(nptr, "bsd2dos") == 0)
		while ((ch = getchar()) != EOF) {
			if (ch == '\n')
				putchar('\r');
			putchar(ch);
		}
	else
		usage();

	if (ferror(stdin) || fclose(stdin))
		err(1, "%s", src);
	if (ferror(stdout) || fclose(stdout))
		err(1, "%s", dst);

	/* Exit successfully. */
	exit(0);
}

void
usage(void)
{
	fprintf(stderr, "usage: fconv [-M] [-D] [-m] [-d] [infile] [outfile]\n"
			"\n"
			"       M : Convert file (or stdin) to Mac format\n"
			"       D : Convert file (or stdin) to DOS format\n"
			"       m : Convert file (or stdin) from Mac format\n"
			"       d : Convert file (or stdin) from DOS format\n"
			"\n"
			"You can also use the shortcut links bsd2dos, dos2bsd,\n"
			"bsd2mac, and mac2bsd; the options are not required.\n");
	exit(1);
}