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Unify mdoc_deroff() and man_deroff() into a common function deroff().
No functional change except that for mdoc(7), it now skips leading
escape sequences just like it already did for man(7).
Escape sequences rarely occur in mdoc(7) code and if they do,
skipping them is an improvement in this context.
Minus 30 lines of code.

/*	$OpenBSD$	*/
/*
 * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2013, 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.
 */

struct	mdoc_arg;
union	mdoc_data;

enum	roff_macroset {
	MACROSET_NONE = 0,
	MACROSET_MDOC,
	MACROSET_MAN
};

enum	roff_sec {
	SEC_NONE = 0,
	SEC_NAME,
	SEC_LIBRARY,
	SEC_SYNOPSIS,
	SEC_DESCRIPTION,
	SEC_CONTEXT,
	SEC_IMPLEMENTATION,	/* IMPLEMENTATION NOTES */
	SEC_RETURN_VALUES,
	SEC_ENVIRONMENT,
	SEC_FILES,
	SEC_EXIT_STATUS,
	SEC_EXAMPLES,
	SEC_DIAGNOSTICS,
	SEC_COMPATIBILITY,
	SEC_ERRORS,
	SEC_SEE_ALSO,
	SEC_STANDARDS,
	SEC_HISTORY,
	SEC_AUTHORS,
	SEC_CAVEATS,
	SEC_BUGS,
	SEC_SECURITY,
	SEC_CUSTOM,
	SEC__MAX
};

enum	roff_type {
	ROFFT_ROOT,
	ROFFT_BLOCK,
	ROFFT_HEAD,
	ROFFT_BODY,
	ROFFT_TAIL,
	ROFFT_ELEM,
	ROFFT_TEXT,
	ROFFT_TBL,
	ROFFT_EQN
};

enum	roff_next {
	ROFF_NEXT_SIBLING = 0,
	ROFF_NEXT_CHILD
};

/*
 * Indicates that a BODY's formatting has ended, but
 * the scope is still open.  Used for badly nested blocks.
 */
enum	mdoc_endbody {
	ENDBODY_NOT = 0,
	ENDBODY_SPACE,	/* Is broken: append a space. */
	ENDBODY_NOSPACE	/* Is broken: don't append a space. */
};

struct	roff_node {
	struct roff_node *parent;  /* Parent AST node. */
	struct roff_node *child;   /* First child AST node. */
	struct roff_node *last;    /* Last child AST node. */
	struct roff_node *next;    /* Sibling AST node. */
	struct roff_node *prev;    /* Prior sibling AST node. */
	struct roff_node *head;    /* BLOCK */
	struct roff_node *body;    /* BLOCK/ENDBODY */
	struct roff_node *tail;    /* BLOCK */
	struct mdoc_arg	 *args;    /* BLOCK/ELEM */
	union mdoc_data	 *norm;    /* Normalized arguments. */
	char		 *string;  /* TEXT */
	const struct tbl_span *span; /* TBL */
	const struct eqn *eqn;	   /* EQN */
	int		  nchild;  /* Number of child nodes. */
	int		  line;    /* Input file line number. */
	int		  pos;     /* Input file column number. */
	int		  tok;     /* Request or macro ID. */
#define	TOKEN_NONE	 (-1)	   /* No request or macro. */
	int		  flags;
#define	MDOC_VALID	 (1 << 0)  /* Has been validated. */
#define	MDOC_ENDED	 (1 << 1)  /* Gone past body end mark. */
#define MDOC_EOS	 (1 << 2)  /* At sentence boundary. */
#define	MDOC_LINE	 (1 << 3)  /* First macro/text on line. */
#define MDOC_SYNPRETTY	 (1 << 4)  /* SYNOPSIS-style formatting. */
#define MDOC_BROKEN	 (1 << 5)  /* Must validate parent when ending. */
#define	MDOC_DELIMO	 (1 << 6)
#define	MDOC_DELIMC	 (1 << 7)
#define	MAN_VALID	  MDOC_VALID
#define	MAN_EOS		  MDOC_EOS
#define	MAN_LINE	  MDOC_LINE
	int		  prev_font; /* Before entering this node. */
	int		  aux;     /* Decoded node data, type-dependent. */
	enum roff_type	  type;    /* AST node type. */
	enum roff_sec	  sec;     /* Current named section. */
	enum mdoc_endbody end;     /* BODY */
};

struct	roff_meta {
	char		 *msec;    /* Manual section, usually a digit. */
	char		 *vol;     /* Manual volume title. */
	char		 *os;      /* Operating system. */
	char		 *arch;    /* Machine architecture. */
	char		 *title;   /* Manual title, usually CAPS. */
	char		 *name;    /* Leading manual name. */
	char		 *date;    /* Normalized date. */
	int		  hasbody; /* Document is not empty. */
};

struct	roff_man {
	struct roff_meta  meta;    /* Document meta-data. */
	struct mparse	 *parse;   /* Parse pointer. */
	struct roff	 *roff;    /* Roff parser state data. */
	const char	 *defos;   /* Default operating system. */
	struct roff_node *first;   /* The first node parsed. */
	struct roff_node *last;    /* The last node parsed. */
	struct roff_node *last_es; /* The most recent Es node. */
	int		  quick;   /* Abort parse early. */
	int		  flags;   /* Parse flags. */
#define	MDOC_LITERAL	 (1 << 1)  /* In a literal scope. */
#define	MDOC_PBODY	 (1 << 2)  /* In the document body. */
#define	MDOC_NEWLINE	 (1 << 3)  /* First macro/text in a line. */
#define	MDOC_PHRASELIT	 (1 << 4)  /* Literal within a partial phrase. */
#define	MDOC_PPHRASE	 (1 << 5)  /* Within a partial phrase. */
#define	MDOC_FREECOL	 (1 << 6)  /* `It' invocation should close. */
#define	MDOC_SYNOPSIS	 (1 << 7)  /* SYNOPSIS-style formatting. */
#define	MDOC_KEEP	 (1 << 8)  /* In a word keep. */
#define	MDOC_SMOFF	 (1 << 9)  /* Spacing is off. */
#define	MDOC_NODELIMC	 (1 << 10) /* Disable closing delimiter handling. */
#define	MAN_ELINE	 (1 << 11) /* Next-line element scope. */
#define	MAN_BLINE	 (1 << 12) /* Next-line block scope. */
#define	MAN_LITERAL	  MDOC_LITERAL
#define	MAN_NEWLINE	  MDOC_NEWLINE
	enum roff_macroset macroset; /* Kind of high-level macros used. */
	enum roff_sec	  lastsec; /* Last section seen. */
	enum roff_sec	  lastnamed; /* Last standard section seen. */
	enum roff_next	  next;    /* Where to put the next node. */
};

__BEGIN_DECLS

void		 deroff(char **, const struct roff_node *);

__END_DECLS