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131 lines
3 KiB
C
131 lines
3 KiB
C
/* $Id: term_tab.c,v 1.6 2020/06/22 19:20:40 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 "config.h"
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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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}
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