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Unify node handling functions:
* node_alloc() for mdoc and man_node_alloc() -> roff_node_alloc()
* node_append() for mdoc and man_node_append() -> roff_node_append()
* mdoc_head_alloc() and man_head_alloc() -> roff_head_alloc()
* mdoc_body_alloc() and man_body_alloc() -> roff_body_alloc()
* mdoc_node_unlink() and man_node_unlink() -> roff_node_unlink()
* mdoc_node_free() and man_node_free() -> roff_node_free()
* mdoc_node_delete() and man_node_delete() -> roff_node_delete()
Minus 130 lines of code, no functional change.

/*	$Id: libman.h,v 1.74 2015/04/19 13:50:25 schwarze Exp $ */
/*
 * Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2014, 2015 Ingo Schwarze <schwarze@openbsd.org>
 *
 * 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 AUTHORS DISCLAIM ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS 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.
 */

#define	MACRO_PROT_ARGS	  struct roff_man *man, \
			  int tok, \
			  int line, \
			  int ppos, \
			  int *pos, \
			  char *buf

struct	man_macro {
	void		(*fp)(MACRO_PROT_ARGS);
	int		  flags;
#define	MAN_SCOPED	 (1 << 0)  /* Optional next-line scope. */
#define	MAN_NSCOPED	 (1 << 1)  /* Allowed in next-line element scope. */
#define	MAN_BSCOPE	 (1 << 2)  /* Break next-line block scope. */
#define	MAN_JOIN	 (1 << 3)  /* Join arguments together. */
};

extern	const struct man_macro *const man_macros;

__BEGIN_DECLS

void		  man_word_alloc(struct roff_man *, int, int, const char *);
void		  man_word_append(struct roff_man *, const char *);
void		  man_block_alloc(struct roff_man *, int, int, int);
void		  man_elem_alloc(struct roff_man *, int, int, int);
int		  man_hash_find(const char *);
void		  man_macroend(struct roff_man *);
void		  man_valid_post(struct roff_man *);
void		  man_unscope(struct roff_man *, const struct roff_node *);

__END_DECLS