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Diffstat (limited to 'usr.bin/mandoc/term_tab.c')
-rw-r--r--usr.bin/mandoc/term_tab.c128
1 files changed, 128 insertions, 0 deletions
diff --git a/usr.bin/mandoc/term_tab.c b/usr.bin/mandoc/term_tab.c
new file mode 100644
index 0000000..0c80c72
--- /dev/null
+++ b/usr.bin/mandoc/term_tab.c
@@ -0,0 +1,128 @@
+/* $OpenBSD: term_tab.c,v 1.4 2017/06/17 14:55:02 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_hen(p, &su);
+ }
+ 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_hen(p, &su);
+ tl->t[tl->n] = pos;
+ if (add && tl->n)
+ tl->t[tl->n] += tl->t[tl->n - 1];
+ tl->n++;
+}
+
+/*
+ * Simplified version without a parser,
+ * never incremental, never periodic, for use by tbl(7).
+ */
+void
+term_tab_iset(size_t inc)
+{
+ if (tabs.a.n >= tabs.a.s) {
+ tabs.a.s += 8;
+ tabs.a.t = mandoc_reallocarray(tabs.a.t, tabs.a.s,
+ sizeof(*tabs.a.t));
+ }
+ tabs.a.t[tabs.a.n++] = inc;
+}
+
+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;
+ 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])
+ return tabs.a.t[i];
+ }
+}