Annotation of mandoc/term_tab.c, Revision 1.3
1.1 schwarze 1: /* $OpenBSD: term.c,v 1.119 2017/01/08 18:08:44 schwarze Exp $ */
2: /*
3: * Copyright (c) 2017 Ingo Schwarze <schwarze@openbsd.org>
4: *
5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16: */
17: #include <sys/types.h>
18:
19: #include <stddef.h>
20:
21: #include "mandoc_aux.h"
22: #include "out.h"
23: #include "term.h"
24:
25: struct tablist {
26: size_t *t; /* Allocated array of tab positions. */
27: size_t s; /* Allocated number of positions. */
28: size_t n; /* Currently used number of positions. */
29: };
30:
31: static struct {
32: struct tablist a; /* All tab positions for lookup. */
33: struct tablist p; /* Periodic tab positions to add. */
34: size_t d; /* Default tab width in units of n. */
35: } tabs;
36:
37:
38: void
39: term_tab_set(const struct termp *p, const char *arg)
40: {
41: static int recording_period;
42:
43: struct roffsu su;
44: struct tablist *tl;
45: size_t pos;
46: int add;
47:
48: /* Special arguments: clear all tabs or switch lists. */
49:
50: if (arg == NULL) {
51: tabs.a.n = tabs.p.n = 0;
52: recording_period = 0;
53: if (tabs.d == 0) {
54: a2roffsu(".8i", &su, SCALE_IN);
1.3 ! schwarze 55: tabs.d = term_hen(p, &su);
1.1 schwarze 56: }
57: return;
58: }
59: if (arg[0] == 'T' && arg[1] == '\0') {
60: recording_period = 1;
61: return;
62: }
63:
64: /* Parse the sign, the number, and the unit. */
65:
66: if (*arg == '+') {
67: add = 1;
68: arg++;
69: } else
70: add = 0;
1.2 schwarze 71: if (a2roffsu(arg, &su, SCALE_EM) == NULL)
1.1 schwarze 72: return;
73:
74: /* Select the list, and extend it if it is full. */
75:
76: tl = recording_period ? &tabs.p : &tabs.a;
77: if (tl->n >= tl->s) {
78: tl->s += 8;
79: tl->t = mandoc_reallocarray(tl->t, tl->s, sizeof(*tl->t));
80: }
81:
82: /* Append the new position. */
83:
1.3 ! schwarze 84: pos = term_hen(p, &su);
1.1 schwarze 85: tl->t[tl->n] = pos;
86: if (add && tl->n)
87: tl->t[tl->n] += tl->t[tl->n - 1];
88: tl->n++;
89: }
90:
91: size_t
92: term_tab_next(size_t prev)
93: {
94: size_t i, j;
95:
96: for (i = 0;; i++) {
97: if (i == tabs.a.n) {
98: if (tabs.p.n == 0)
99: return prev;
100: tabs.a.n += tabs.p.n;
101: if (tabs.a.s < tabs.a.n) {
102: tabs.a.s = tabs.a.n;
103: tabs.a.t = mandoc_reallocarray(tabs.a.t,
104: tabs.a.s, sizeof(*tabs.a.t));
105: }
106: for (j = 0; j < tabs.p.n; j++)
107: tabs.a.t[i + j] = tabs.p.t[j] +
108: (i ? tabs.a.t[i - 1] : 0);
109: }
1.3 ! schwarze 110: if (prev < tabs.a.t[i])
! 111: return tabs.a.t[i];
1.1 schwarze 112: }
113: }
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