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Support nested roff instructions:
* allow roff_parseln() to be re-run
* allow roff_parseln() to manipulate the line buffer offset
* support the offset in the man and mdoc libraries
* adapt .if, .ie, .el, .ig, .am* and .de* support
* interpret some instructions even in conditional-negative context
Coded by kristaps during the last day of the mandoc hackathon.

To avoid regressions in the OpenBSD tree, commit this together
with some small local additions:
* detect roff block end "\}" even on macro lines
* actually implement the ".if n" conditional
* ignore .ds, .rm and .tr in libroff

Also back my old .if/.ie/.el-handling out of libman, reverting:
man.h 1.15 man.c 1.25 man_macro.c 1.15 man_validate.c 1.19
man_action.c 1.15 man_term.c 1.28 man_html.c 1.9.

/*	$Id: roff.h,v 1.2 2010/05/20 00:58:02 schwarze Exp $ */
/*
 * Copyright (c) 2010 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.
 */
#ifndef ROFF_H
#define ROFF_H

enum	rofferr {
	ROFF_CONT, /* continue processing line */
	ROFF_RERUN, /* re-run roff interpreter with offset */
	ROFF_IGN, /* ignore current line */
	ROFF_ERR /* badness: puke and stop */
};

__BEGIN_DECLS

struct	roff;

void	 	  roff_free(struct roff *);
struct	roff	 *roff_alloc(mandocmsg, void *);
void		  roff_reset(struct roff *);
enum	rofferr	  roff_parseln(struct roff *, int, 
			char **, size_t *, int, int *);
int		  roff_endparse(struct roff *);

__END_DECLS

#endif /*!ROFF_H*/