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Make the function parse_file() fit for recursion:
* Save and restore reporting data around the read loop.
* Open the file inside the function, not before calling it.
* On the top level, change directory on a best-effort basis.
* Finalize the parse tree only on the top level.
No new functionality yet.

/* $Id: main.c,v 1.4 2019/04/08 22:47:34 schwarze Exp $ */
/*
 * Copyright (c) 2014 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2019 Ingo Schwarze <schwarze@openbsd.org>
 *
 * 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 AUTHORS DISCLAIM ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS 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 <getopt.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#include "node.h"
#include "parse.h"
#include "format.h"

/*
 * The steering function of the docbook2mdoc(1) program.
 */

int
main(int argc, char *argv[])
{
	struct parse	*parser;
	struct ptree	*tree;
	const char	*progname;
	const char	*fname;
	int		 ch, fd, rc, warn;

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

	warn = 0;
	while ((ch = getopt(argc, argv, "W")) != -1) {
		switch (ch) {
		case 'W':
			warn = 1;
			break;
		default:
			goto usage;
		}
	}
	argc -= optind;
	argv += optind;

	/*
	 * Argument processing:
	 * Open file or use standard input.
	 */

	if (argc > 1) {
		fprintf(stderr, "%s: Too many arguments\n", argv[1]);
		goto usage;
	} else if (argc == 1) {
		fname = argv[0];
		fd = -1;
	} else {
		fname = "<stdin>";
		fd = STDIN_FILENO;
	}

	/* Parse. */

	if ((parser = parse_alloc(warn)) == NULL) {
		perror(NULL);
		return 1;
	}
	tree = parse_file(parser, fd, fname);
	rc = tree->flags & TREE_FAIL ? 1 : 0;

	/* Format. */

	if (tree->root != NULL) {
		if (rc)
			fputc('\n', stderr);
		ptree_print(tree);
		if (rc)
			fputs("\nThe output may be incomplete, see the "
			    "parse error reported above.\n\n", stderr);
	}
	parse_free(parser);
	return rc;

usage:
	fprintf(stderr, "usage: %s [-W] [input_filename]\n", progname);
	return 1;
}