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Add initial EQN support to mandoc.  This parses, then throws away, data
between EQ and EN roff blocks.  EQN is different from TBL in that data
after .EQ is unilaterally considered an equation until an .EN.  Thus,
there's no need to jump through hoops in having table spans and so on.
This is ONLY the parse code framework in libroff.  EQN is not yet passed
into the backends.

/*	$Id: eqn.c,v 1.1 2011/02/06 20:36:36 kristaps 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.
 */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include "mandoc.h"
#include "roff.h"
#include "libmandoc.h"
#include "libroff.h"

/* ARGSUSED */
enum rofferr
eqn_read(struct eqn_node **epp, int ln, const char *p, int offs)
{
	size_t		 sz;
	struct eqn_node	*ep;

	if (0 == strcmp(p, ".EN")) {
		*epp = NULL;
		return(ROFF_EQN);
	}

	ep = *epp;

	sz = strlen(&p[offs]);
	ep->eqn.data = mandoc_realloc(ep->eqn.data, ep->eqn.sz + sz + 1);
	if (0 == ep->eqn.sz)
		*ep->eqn.data = '\0';

	ep->eqn.sz += sz;
	strlcat(ep->eqn.data, &p[offs], ep->eqn.sz + 1);
	return(ROFF_IGN);
}

struct eqn_node *
eqn_alloc(int pos, int line)
{
	struct eqn_node	*p;

	p = mandoc_calloc(1, sizeof(struct eqn_node));
	p->line = line;
	p->pos = pos;

	return(p);
}

void
eqn_end(struct eqn_node *e)
{

	/* Nothing to do. */
}

void
eqn_free(struct eqn_node *p)
{

	free(p->eqn.data);
	free(p);
}