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First step of adding register support.  This is inspired by a significant
patch by schwarze@.  This commit adds support to libroff parsing `nr'
into register set defined in regs.h.  This will propogate into libmdoc
and libman in later commits.

/*	$Id: regs.h,v 1.1 2010/06/26 15:22:19 kristaps 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 REGS_H
#define REGS_H

__BEGIN_DECLS

enum	regs {
	REG_nS = 0,	/* nS */
	REG__MAX
};

/*
 * Registers are passed into libmdoc and libman.  They refer to some
 * sort of external state.
 */
struct	regset {
	union {
		int	 i; /* integer value */
	} regs[REG__MAX];
};

__END_DECLS

#endif /*!REGS_H*/