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/* $OpenBSD: term_tab.c,v 1.2 2017/06/08 12:54:40 schwarze Exp $ */
/*
* Copyright (c) 2017 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.
*/
#include <sys/types.h>
#include <stddef.h>
#include "mandoc_aux.h"
#include "out.h"
#include "term.h"
struct tablist {
size_t *t; /* Allocated array of tab positions. */
size_t s; /* Allocated number of positions. */
size_t n; /* Currently used number of positions. */
};
static struct {
struct tablist a; /* All tab positions for lookup. */
struct tablist p; /* Periodic tab positions to add. */
size_t d; /* Default tab width in units of n. */
} tabs;
void
term_tab_set(const struct termp *p, const char *arg)
{
static int recording_period;
struct roffsu su;
struct tablist *tl;
size_t pos;
int add;
/* Special arguments: clear all tabs or switch lists. */
if (arg == NULL) {
tabs.a.n = tabs.p.n = 0;
recording_period = 0;
if (tabs.d == 0) {
a2roffsu(".8i", &su, SCALE_IN);
tabs.d = term_hspan(p, &su) / 24;
}
return;
}
if (arg[0] == 'T' && arg[1] == '\0') {
recording_period = 1;
return;
}
/* Parse the sign, the number, and the unit. */
if (*arg == '+') {
add = 1;
arg++;
} else
add = 0;
if (a2roffsu(arg, &su, SCALE_EM) == NULL)
return;
/* Select the list, and extend it if it is full. */
tl = recording_period ? &tabs.p : &tabs.a;
if (tl->n >= tl->s) {
tl->s += 8;
tl->t = mandoc_reallocarray(tl->t, tl->s, sizeof(*tl->t));
}
/* Append the new position. */
pos = term_hspan(p, &su);
tl->t[tl->n] = pos;
if (add && tl->n)
tl->t[tl->n] += tl->t[tl->n - 1];
tl->n++;
}
size_t
term_tab_next(size_t prev)
{
size_t i, j;
for (i = 0;; i++) {
if (i == tabs.a.n) {
if (tabs.p.n == 0)
return prev;
/*
return i ? prev :
(prev / tabs.d + 1) * tabs.d;
*/
tabs.a.n += tabs.p.n;
if (tabs.a.s < tabs.a.n) {
tabs.a.s = tabs.a.n;
tabs.a.t = mandoc_reallocarray(tabs.a.t,
tabs.a.s, sizeof(*tabs.a.t));
}
for (j = 0; j < tabs.p.n; j++)
tabs.a.t[i + j] = tabs.p.t[j] +
(i ? tabs.a.t[i - 1] : 0);
}
if (prev < tabs.a.t[i] / 24)
return tabs.a.t[i] / 24;
}
}
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