GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/mandoc/term_tab.c Lines: 48 49 98.0 %
Date: 2017-11-13 Branches: 29 32 90.6 %

Line Branch Exec Source
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/*	$OpenBSD: term_tab.c,v 1.4 2017/06/17 14:55:02 schwarze Exp $ */
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/*
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 * Copyright (c) 2017 Ingo Schwarze <schwarze@openbsd.org>
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 *
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 * Permission to use, copy, modify, and distribute this software for any
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 * purpose with or without fee is hereby granted, provided that the above
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 * copyright notice and this permission notice appear in all copies.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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 */
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#include <sys/types.h>
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#include <stddef.h>
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#include "mandoc_aux.h"
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#include "out.h"
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#include "term.h"
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struct tablist {
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	size_t	*t;	/* Allocated array of tab positions. */
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	size_t	 s;	/* Allocated number of positions. */
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	size_t	 n;	/* Currently used number of positions. */
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};
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static struct {
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	struct tablist	 a;	/* All tab positions for lookup. */
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	struct tablist	 p;	/* Periodic tab positions to add. */
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	size_t		 d;	/* Default tab width in units of n. */
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} tabs;
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void
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term_tab_set(const struct termp *p, const char *arg)
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{
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	static int	 recording_period;
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	struct roffsu	 su;
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	struct tablist	*tl;
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	size_t		 pos;
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	int		 add;
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	/* Special arguments: clear all tabs or switch lists. */
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	if (arg == NULL) {
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		tabs.a.n = tabs.p.n = 0;
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		recording_period = 0;
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		if (tabs.d == 0) {
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			a2roffsu(".8i", &su, SCALE_IN);
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			tabs.d = term_hen(p, &su);
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		}
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		return;
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	}
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	if (arg[0] == 'T' && arg[1] == '\0') {
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		recording_period = 1;
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		return;
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	}
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	/* Parse the sign, the number, and the unit. */
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	if (*arg == '+') {
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		add = 1;
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		arg++;
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	} else
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		add = 0;
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	if (a2roffsu(arg, &su, SCALE_EM) == NULL)
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		return;
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	/* Select the list, and extend it if it is full. */
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	tl = recording_period ? &tabs.p : &tabs.a;
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	if (tl->n >= tl->s) {
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		tl->s += 8;
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		tl->t = mandoc_reallocarray(tl->t, tl->s, sizeof(*tl->t));
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	}
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	/* Append the new position. */
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	pos = term_hen(p, &su);
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	tl->t[tl->n] = pos;
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	if (add && tl->n)
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		tl->t[tl->n] += tl->t[tl->n - 1];
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	tl->n++;
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}
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/*
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 * Simplified version without a parser,
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 * never incremental, never periodic, for use by tbl(7).
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 */
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void
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term_tab_iset(size_t inc)
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{
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	if (tabs.a.n >= tabs.a.s) {
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		tabs.a.s += 8;
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		tabs.a.t = mandoc_reallocarray(tabs.a.t, tabs.a.s,
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		    sizeof(*tabs.a.t));
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	}
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	tabs.a.t[tabs.a.n++] = inc;
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}
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size_t
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term_tab_next(size_t prev)
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{
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	size_t	 i, j;
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	for (i = 0;; i++) {
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		if (i == tabs.a.n) {
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			if (tabs.p.n == 0)
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				return prev;
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			tabs.a.n += tabs.p.n;
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			if (tabs.a.s < tabs.a.n) {
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				tabs.a.s = tabs.a.n;
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				tabs.a.t = mandoc_reallocarray(tabs.a.t,
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				    tabs.a.s, sizeof(*tabs.a.t));
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			}
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			for (j = 0; j < tabs.p.n; j++)
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				tabs.a.t[i + j] = tabs.p.t[j] +
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				    (i ? tabs.a.t[i - 1] : 0);
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		}
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		if (prev < tabs.a.t[i])
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			return tabs.a.t[i];
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	}
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}