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When starting a new input line, even when continuing the same output
line, use the current output position as the reference position
for tabs on that input line.  This brings mandoc in line with the
behaviour of GNU, Heirloom, and Plan 9 roff.

/* $Id: term.h,v 1.134 2022/08/16 17:45:55 schwarze Exp $ */
/*
 * Copyright (c) 2011-2015,2017,2019,2022 Ingo Schwarze <schwarze@openbsd.org>
 * Copyright (c) 2008, 2009, 2010, 2011 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 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.
 */

enum	termenc {
	TERMENC_ASCII,
	TERMENC_LOCALE,
	TERMENC_UTF8
};

enum	termtype {
	TERMTYPE_CHAR,
	TERMTYPE_PS,
	TERMTYPE_PDF
};

enum	termfont {
	TERMFONT_NONE = 0,
	TERMFONT_BOLD,
	TERMFONT_UNDER,
	TERMFONT_BI,
	TERMFONT__MAX
};

struct	eqn_box;
struct	roff_meta;
struct	roff_node;
struct	tbl_span;
struct	termp;

typedef void	(*term_margin)(struct termp *, const struct roff_meta *);

struct	termp_tbl {
	int		  width;	/* width in fixed chars */
	int		  decimal;	/* decimal point position */
};

struct	termp_col {
	int		 *buf;		/* Output buffer. */
	size_t		  maxcols;	/* Allocated bytes in buf. */
	size_t		  lastcol;	/* Last byte in buf. */
	size_t		  col;		/* Byte in buf to be written. */
	size_t		  rmargin;	/* Current right margin. */
	size_t		  offset;	/* Current left margin. */
	size_t		  taboff;	/* Offset for literal tabs. */
};

struct	termp {
	struct rofftbl	  tbl;		/* Table configuration. */
	struct termp_col *tcols;	/* Array of table columns. */
	struct termp_col *tcol;		/* Current table column. */
	size_t		  maxtcol;	/* Allocated table columns. */
	size_t		  lasttcol;	/* Last column currently used. */
	size_t		  line;		/* Current output line number. */
	size_t		  defindent;	/* Default indent for text. */
	size_t		  defrmargin;	/* Right margin of the device. */
	size_t		  lastrmargin;	/* Right margin before the last ll. */
	size_t		  maxrmargin;	/* Max right margin. */
	size_t		  col;		/* Byte position in buf. */
	size_t		  viscol;	/* Chars on current line. */
	size_t		  trailspace;	/* See term_flushln(). */
	size_t		  minbl;	/* Minimum blanks before next field. */
	int		  synopsisonly; /* Print the synopsis only. */
	int		  mdocstyle;	/* Imitate mdoc(7) output. */
	int		  ti;		/* Temporary indent for one line. */
	int		  skipvsp;	/* Vertical space to skip. */
	int		  flags;
#define	TERMP_SENTENCE	 (1 << 0)	/* Space before a sentence. */
#define	TERMP_NOSPACE	 (1 << 1)	/* No space before words. */
#define	TERMP_NONOSPACE	 (1 << 2)	/* No space (no autounset). */
#define	TERMP_NBRWORD	 (1 << 3)	/* Make next word nonbreaking. */
#define	TERMP_KEEP	 (1 << 4)	/* Keep words together. */
#define	TERMP_PREKEEP	 (1 << 5)	/* ...starting with the next one. */
#define	TERMP_BACKAFTER	 (1 << 6)	/* Back up after next character. */
#define	TERMP_BACKBEFORE (1 << 7)	/* Back up before next character. */
#define	TERMP_NOBREAK	 (1 << 8)	/* See term_flushln(). */
#define	TERMP_BRTRSP	 (1 << 9)	/* See term_flushln(). */
#define	TERMP_BRIND	 (1 << 10)	/* See term_flushln(). */
#define	TERMP_HANG	 (1 << 11)	/* See term_flushln(). */
#define	TERMP_NOPAD	 (1 << 12)	/* See term_flushln(). */
#define	TERMP_NOSPLIT	 (1 << 13)	/* Do not break line before .An. */
#define	TERMP_SPLIT	 (1 << 14)	/* Break line before .An. */
#define	TERMP_NONEWLINE	 (1 << 15)	/* No line break in nofill mode. */
#define	TERMP_BRNEVER	 (1 << 16)	/* Don't even break at maxrmargin. */
#define	TERMP_NOBUF	 (1 << 17)	/* Bypass output buffer. */
#define	TERMP_NEWMC	 (1 << 18)	/* No .mc printed yet. */
#define	TERMP_ENDMC	 (1 << 19)	/* Next break ends .mc mode. */
#define	TERMP_MULTICOL	 (1 << 20)	/* Multiple column mode. */
#define	TERMP_CENTER	 (1 << 21)	/* Center output lines. */
#define	TERMP_RIGHT	 (1 << 22)	/* Adjust to the right margin. */
	enum termtype	  type;		/* Terminal, PS, or PDF. */
	enum termenc	  enc;		/* Type of encoding. */
	enum termfont	  fontl;	/* Last font set. */
	enum termfont	 *fontq;	/* Symmetric fonts. */
	int		  fontsz;	/* Allocated size of font stack */
	int		  fonti;	/* Index of font stack. */
	term_margin	  headf;	/* invoked to print head */
	term_margin	  footf;	/* invoked to print foot */
	void		(*letter)(struct termp *, int);
	void		(*begin)(struct termp *);
	void		(*end)(struct termp *);
	void		(*endline)(struct termp *);
	void		(*advance)(struct termp *, size_t);
	void		(*setwidth)(struct termp *, int, int);
	size_t		(*width)(const struct termp *, int);
	int		(*hspan)(const struct termp *,
				const struct roffsu *);
	const void	 *argf;		/* arg for headf/footf */
	const char	 *mc;		/* Margin character. */
	struct termp_ps	 *ps;
};


const char	 *ascii_uc2str(int);

void		  roff_term_pre(struct termp *, const struct roff_node *);

void		  term_eqn(struct termp *, const struct eqn_box *);
void		  term_tbl(struct termp *, const struct tbl_span *);
void		  term_free(struct termp *);
void		  term_setcol(struct termp *, size_t);
void		  term_newln(struct termp *);
void		  term_vspace(struct termp *);
void		  term_word(struct termp *, const char *);
void		  term_flushln(struct termp *);
void		  term_begin(struct termp *, term_margin,
			term_margin, const struct roff_meta *);
void		  term_end(struct termp *);

void		  term_setwidth(struct termp *, const char *);
int		  term_hspan(const struct termp *, const struct roffsu *);
int		  term_hen(const struct termp *, const struct roffsu *);
int		  term_vspan(const struct termp *, const struct roffsu *);
size_t		  term_strlen(const struct termp *, const char *);
size_t		  term_len(const struct termp *, size_t);

void		  term_tab_set(const struct termp *, const char *);
void		  term_tab_iset(size_t);
void		  term_tab_ref(struct termp *);
size_t		  term_tab_next(size_t);
void		  term_tab_free(void);

void		  term_fontpush(struct termp *, enum termfont);
void		  term_fontpop(struct termp *);
void		  term_fontpopq(struct termp *, int);
void		  term_fontrepl(struct termp *, enum termfont);
void		  term_fontlast(struct termp *);