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Have the standard manpage header and footer print on every page of -Tps
output.  This is more tricky than you may think:  we can't just call the
header function out-of-state (i.e., before a flushln has occured)
because we'd clobber our current state.  Thus, we call at the beginning
and dump the output into an auxiliary buffer.

For the record, I don't think there's any other clean way to do this.
The only other Way That Works is to copy-aside *all* termp state, zero
it, and do the necessary headf/footf.  This is just as complex, as
memory needs to be alloc'd and free'd per margin.

Unfortunately, this prohibits page numbering (the margin is only printed
once), so I'll probably end up re-writing this down the line.

/*	$Id: term_ascii.c,v 1.3 2010/06/09 08:07:13 kristaps Exp $ */
/*
 * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
 *
 * 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.
 */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <sys/types.h>

#include <assert.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "out.h"
#include "term.h"
#include "main.h"

static	void		  ascii_endline(struct termp *);
static	void		  ascii_letter(struct termp *, char);
static	void		  ascii_begin(struct termp *);
static	void		  ascii_advance(struct termp *, size_t);
static	void		  ascii_end(struct termp *);


void *
ascii_alloc(char *outopts)
{
	struct termp	*p;
	const char	*toks[2];
	char		*v;

	if (NULL == (p = term_alloc(TERMENC_ASCII)))
		return(NULL);

	p->type = TERMTYPE_CHAR;
	p->letter = ascii_letter;
	p->begin = ascii_begin;
	p->end = ascii_end;
	p->endline = ascii_endline;
	p->advance = ascii_advance;

	toks[0] = "width";
	toks[1] = NULL;

	while (outopts && *outopts)
		switch (getsubopt(&outopts, UNCONST(toks), &v)) {
		case (0):
			p->defrmargin = (size_t)atoi(v);
			break;
		default:
			break;
		}

	/* Enforce a lower boundary. */
	if (p->defrmargin < 58)
		p->defrmargin = 58;

	return(p);
}


void
ascii_free(void *arg)
{

	term_free((struct termp *)arg);
}


/* ARGSUSED */
static void
ascii_letter(struct termp *p, char c)
{
	
	putchar(c);
}


static void
ascii_begin(struct termp *p)
{

	(*p->headf)(p, p->argf);
}


static void
ascii_end(struct termp *p)
{

	(*p->footf)(p, p->argf);
}


/* ARGSUSED */
static void
ascii_endline(struct termp *p)
{

	putchar('\n');
}


/* ARGSUSED */
static void
ascii_advance(struct termp *p, size_t len)
{
	size_t	 	i;

	/* Just print whitespace on the terminal. */
	for (i = 0; i < len; i++)
		putchar(' ');
}