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It was very surprising that a function called mparse_readfd()
closed the file descriptor passed to it after completing its work,
in particular considering the fact that it required its callers
to call open(2) or mparse_open() beforehand.

Change mparse_readfd() to not call close(2) and change the callers
to call close(2) afterwards, more or less bringing open and close
to the same level of the code and making review easier.  Note that
man.cgi(8) already did that, even though it was wrong in the past.

Small restructuring suggested by Christos Zoulas (NetBSD).

/*	$Id: demandoc.c,v 1.25 2016/01/08 02:13:39 schwarze Exp $ */
/*
 * Copyright (c) 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 *
 * 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 "config.h"

#include <sys/types.h>

#include <assert.h>
#include <ctype.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "roff.h"
#include "man.h"
#include "mdoc.h"
#include "mandoc.h"

static	void	 pline(int, int *, int *, int);
static	void	 pman(const struct roff_node *, int *, int *, int);
static	void	 pmandoc(struct mparse *, int, const char *, int);
static	void	 pmdoc(const struct roff_node *, int *, int *, int);
static	void	 pstring(const char *, int, int *, int);
static	void	 usage(void);

static	const char	 *progname;

int
main(int argc, char *argv[])
{
	struct mparse	*mp;
	int		 ch, fd, i, list;
	extern int	 optind;

	if (argc < 1)
		progname = "demandoc";
	else if ((progname = strrchr(argv[0], '/')) == NULL)
		progname = argv[0];
	else
		++progname;

	mp = NULL;
	list = 0;

	while (-1 != (ch = getopt(argc, argv, "ikm:pw")))
		switch (ch) {
		case ('i'):
			/* FALLTHROUGH */
		case ('k'):
			/* FALLTHROUGH */
		case ('m'):
			/* FALLTHROUGH */
		case ('p'):
			break;
		case ('w'):
			list = 1;
			break;
		default:
			usage();
			return (int)MANDOCLEVEL_BADARG;
		}

	argc -= optind;
	argv += optind;

	mchars_alloc();
	mp = mparse_alloc(MPARSE_SO, MANDOCLEVEL_BADARG, NULL, NULL);
	assert(mp);

	if (argc < 1)
		pmandoc(mp, STDIN_FILENO, "<stdin>", list);

	for (i = 0; i < argc; i++) {
		mparse_reset(mp);
		if (mparse_open(mp, &fd, argv[i]) != MANDOCLEVEL_OK) {
			perror(argv[i]);
			continue;
		}
		pmandoc(mp, fd, argv[i], list);
	}

	mparse_free(mp);
	mchars_free();
	return (int)MANDOCLEVEL_OK;
}

static void
usage(void)
{

	fprintf(stderr, "usage: %s [-w] [files...]\n", progname);
}

static void
pmandoc(struct mparse *mp, int fd, const char *fn, int list)
{
	struct roff_man	*man;
	int		 line, col;

	mparse_readfd(mp, fd, fn);
	close(fd);
	mparse_result(mp, &man, NULL);
	line = 1;
	col = 0;

	if (man == NULL)
		return;
	if (man->macroset == MACROSET_MDOC) {
		mdoc_validate(man);
		pmdoc(man->first->child, &line, &col, list);
	} else {
		man_validate(man);
		pman(man->first->child, &line, &col, list);
	}

	if ( ! list)
		putchar('\n');
}

/*
 * Strip the escapes out of a string, emitting the results.
 */
static void
pstring(const char *p, int col, int *colp, int list)
{
	enum mandoc_esc	 esc;
	const char	*start, *end;
	int		 emit;

	/*
	 * Print as many column spaces til we achieve parity with the
	 * input document.
	 */

again:
	if (list && '\0' != *p) {
		while (isspace((unsigned char)*p))
			p++;

		while ('\'' == *p || '(' == *p || '"' == *p)
			p++;

		emit = isalpha((unsigned char)p[0]) &&
			isalpha((unsigned char)p[1]);

		for (start = p; '\0' != *p; p++)
			if ('\\' == *p) {
				p++;
				esc = mandoc_escape(&p, NULL, NULL);
				if (ESCAPE_ERROR == esc)
					return;
				emit = 0;
			} else if (isspace((unsigned char)*p))
				break;

		end = p - 1;

		while (end > start)
			if ('.' == *end || ',' == *end ||
					'\'' == *end || '"' == *end ||
					')' == *end || '!' == *end ||
					'?' == *end || ':' == *end ||
					';' == *end)
				end--;
			else
				break;

		if (emit && end - start >= 1) {
			for ( ; start <= end; start++)
				if (ASCII_HYPH == *start)
					putchar('-');
				else
					putchar((unsigned char)*start);
			putchar('\n');
		}

		if (isspace((unsigned char)*p))
			goto again;

		return;
	}

	while (*colp < col) {
		putchar(' ');
		(*colp)++;
	}

	/*
	 * Print the input word, skipping any special characters.
	 */
	while ('\0' != *p)
		if ('\\' == *p) {
			p++;
			esc = mandoc_escape(&p, NULL, NULL);
			if (ESCAPE_ERROR == esc)
				break;
		} else {
			putchar((unsigned char )*p++);
			(*colp)++;
		}
}

static void
pline(int line, int *linep, int *col, int list)
{

	if (list)
		return;

	/*
	 * Print out as many lines as needed to reach parity with the
	 * original input.
	 */

	while (*linep < line) {
		putchar('\n');
		(*linep)++;
	}

	*col = 0;
}

static void
pmdoc(const struct roff_node *p, int *line, int *col, int list)
{

	for ( ; p; p = p->next) {
		if (MDOC_LINE & p->flags)
			pline(p->line, line, col, list);
		if (ROFFT_TEXT == p->type)
			pstring(p->string, p->pos, col, list);
		if (p->child)
			pmdoc(p->child, line, col, list);
	}
}

static void
pman(const struct roff_node *p, int *line, int *col, int list)
{

	for ( ; p; p = p->next) {
		if (MAN_LINE & p->flags)
			pline(p->line, line, col, list);
		if (ROFFT_TEXT == p->type)
			pstring(p->string, p->pos, col, list);
		if (p->child)
			pman(p->child, line, col, list);
	}
}