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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: dc.c,v 1.11 2009/10/27 23:59:37 deraadt Exp $	*/

/*
 * Copyright (c) 2003, Otto Moerbeek <otto@drijf.net>
 *
 * 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 <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "extern.h"

static __dead void	usage(void);

extern char		*__progname;

static __dead void
usage(void)
{
	(void)fprintf(stderr, "usage: %s [-x] [-e expression] [file]\n",
	    __progname);
	exit(1);
}

int
main(int argc, char *argv[])
{
	int		ch;
	bool		extended_regs = false;
	FILE		*file;
	struct source	src;
	char		*buf, *p;
	struct stat	st;


	if ((buf = strdup("")) == NULL)
		err(1, NULL);
	/* accept and ignore a single dash to be 4.4BSD dc(1) compatible */
	while ((ch = getopt(argc, argv, "e:x-")) != -1) {
		switch (ch) {
		case 'e':
			p = buf;
			if (asprintf(&buf, "%s %s", buf, optarg) == -1)
				err(1, NULL);
			free(p);
			break;
		case 'x':
			extended_regs = true;
			break;
		case '-':
			break;
		default:
			usage();
		}
	}
	argc -= optind;
	argv += optind;

	init_bmachine(extended_regs);
	(void)setlinebuf(stdout);
	(void)setlinebuf(stderr);

	if (argc > 1)
		usage();
	if (buf[0] != '\0') {
		src_setstring(&src, buf);
		reset_bmachine(&src);
		eval();
		free(buf);
		if (argc == 0)
			return (0);
	}
	if (argc == 1) {
		file = fopen(argv[0], "r");
		if (file == NULL)
			err(1, "cannot open file %s", argv[0]);
		if (fstat(fileno(file), &st) == -1)
			err(1, "%s", argv[0]);
		if (S_ISDIR(st.st_mode)) {
			errno = EISDIR;
			err(1, "%s", argv[0]);
		}
		src_setstream(&src, file);
		reset_bmachine(&src);
		eval();
		(void)fclose(file);
		/*
		 * BSD and Solaris dc(1) continue with stdin after processing
		 * the file given as the argument. We follow GNU dc(1).
		 */
		 return (0);
	}
	src_setstream(&src, stdin);
	reset_bmachine(&src);
	eval();

	return (0);
}