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Complete rewrite of the lexer in a single function with four operation
modes instead of four functions, resulting in considerable
simplification, fifty lines less of code, fifteen fewer automatic
variables, and several bug fixes, for example:

1. The delim control statement consumes exactly two bytes of input,
requires no whitespace after these two bytes, and does not treat
quotes in any special way.
2. If the argument of left, right, gfont, gsize, or size is defined
as an alias, only the first word of the value is used as the
delimiter, font name, or font size.
3. If a back, fwd, down, or up keyword is followed by another keyword
instead of the required number, GNU eqn does nothing useful, but
typically errors out.  So no need to have special handling (with
an ugly goto!) for it in mandoc.

Also getting rid of one pointless static buffer and twelve redundant
calls to strlcpy(3).

/*	$Id: libroff.h,v 1.40 2017/06/26 20:09:04 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 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.
 */

enum	tbl_part {
	TBL_PART_OPTS, /* in options (first line) */
	TBL_PART_LAYOUT, /* describing layout */
	TBL_PART_DATA, /* creating data rows */
	TBL_PART_CDATA /* continue previous row */
};

struct	tbl_node {
	struct mparse	 *parse; /* parse point */
	int		  pos; /* invocation column */
	int		  line; /* invocation line */
	enum tbl_part	  part;
	struct tbl_opts	  opts;
	struct tbl_row	 *first_row;
	struct tbl_row	 *last_row;
	struct tbl_span	 *first_span;
	struct tbl_span	 *current_span;
	struct tbl_span	 *last_span;
	struct tbl_node	 *next;
};

struct	eqn_node {
	struct eqn	  eqn;    /* syntax tree of this equation */
	struct mparse	 *parse;  /* main parser, for error reporting */
	struct eqn_node  *next;   /* singly linked list of equations */
	struct eqn_def	 *defs;   /* array of definitions */
	char		 *data;   /* source code of this equation */
	char		 *start;  /* first byte of the current token */
	char		 *end;	  /* first byte of the next token */
	size_t		  defsz;  /* number of definitions */
	size_t		  sz;     /* length of the source code */
	size_t		  toksz;  /* length of the current token */
	int		  gsize;  /* default point size */
	int		  delim;  /* in-line delimiters enabled */
	char		  odelim; /* in-line opening delimiter */
	char		  cdelim; /* in-line closing delimiter */
};

struct	eqn_def {
	char		 *key;
	size_t		  keysz;
	char		 *val;
	size_t		  valsz;
};


struct tbl_node	*tbl_alloc(int, int, struct mparse *);
void		 tbl_restart(int, int, struct tbl_node *);
void		 tbl_free(struct tbl_node *);
void		 tbl_reset(struct tbl_node *);
enum rofferr	 tbl_read(struct tbl_node *, int, const char *, int);
void		 tbl_option(struct tbl_node *, int, const char *, int *);
void		 tbl_layout(struct tbl_node *, int, const char *, int);
void		 tbl_data(struct tbl_node *, int, const char *, int);
int		 tbl_cdata(struct tbl_node *, int, const char *, int);
const struct tbl_span	*tbl_span(struct tbl_node *);
int		 tbl_end(struct tbl_node **);
struct eqn_node	*eqn_alloc(int, int, struct mparse *);
enum rofferr	 eqn_end(struct eqn_node **);
void		 eqn_free(struct eqn_node *);
enum rofferr	 eqn_read(struct eqn_node **, int,
			const char *, int, int *);