Annotation of mandoc/term_tab.c, Revision 1.6
1.6 ! schwarze 1: /* $Id: term_tab.c,v 1.5 2018/12/16 00:21:05 schwarze Exp $ */
1.1 schwarze 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: */
1.6 ! schwarze 17: #include "config.h"
! 18:
1.1 schwarze 19: #include <sys/types.h>
20:
21: #include <stddef.h>
22:
23: #include "mandoc_aux.h"
24: #include "out.h"
25: #include "term.h"
26:
27: struct tablist {
28: size_t *t; /* Allocated array of tab positions. */
29: size_t s; /* Allocated number of positions. */
30: size_t n; /* Currently used number of positions. */
31: };
32:
33: static struct {
34: struct tablist a; /* All tab positions for lookup. */
35: struct tablist p; /* Periodic tab positions to add. */
36: size_t d; /* Default tab width in units of n. */
37: } tabs;
38:
39:
40: void
41: term_tab_set(const struct termp *p, const char *arg)
42: {
43: static int recording_period;
44:
45: struct roffsu su;
46: struct tablist *tl;
47: size_t pos;
48: int add;
49:
50: /* Special arguments: clear all tabs or switch lists. */
51:
52: if (arg == NULL) {
53: tabs.a.n = tabs.p.n = 0;
54: recording_period = 0;
55: if (tabs.d == 0) {
56: a2roffsu(".8i", &su, SCALE_IN);
1.3 schwarze 57: tabs.d = term_hen(p, &su);
1.1 schwarze 58: }
59: return;
60: }
61: if (arg[0] == 'T' && arg[1] == '\0') {
62: recording_period = 1;
63: return;
64: }
65:
66: /* Parse the sign, the number, and the unit. */
67:
68: if (*arg == '+') {
69: add = 1;
70: arg++;
71: } else
72: add = 0;
1.2 schwarze 73: if (a2roffsu(arg, &su, SCALE_EM) == NULL)
1.1 schwarze 74: return;
75:
76: /* Select the list, and extend it if it is full. */
77:
78: tl = recording_period ? &tabs.p : &tabs.a;
79: if (tl->n >= tl->s) {
80: tl->s += 8;
81: tl->t = mandoc_reallocarray(tl->t, tl->s, sizeof(*tl->t));
82: }
83:
84: /* Append the new position. */
85:
1.3 schwarze 86: pos = term_hen(p, &su);
1.1 schwarze 87: tl->t[tl->n] = pos;
88: if (add && tl->n)
89: tl->t[tl->n] += tl->t[tl->n - 1];
90: tl->n++;
91: }
92:
1.4 schwarze 93: /*
94: * Simplified version without a parser,
95: * never incremental, never periodic, for use by tbl(7).
96: */
97: void
98: term_tab_iset(size_t inc)
99: {
100: if (tabs.a.n >= tabs.a.s) {
101: tabs.a.s += 8;
102: tabs.a.t = mandoc_reallocarray(tabs.a.t, tabs.a.s,
103: sizeof(*tabs.a.t));
104: }
105: tabs.a.t[tabs.a.n++] = inc;
106: }
107:
1.1 schwarze 108: size_t
109: term_tab_next(size_t prev)
110: {
111: size_t i, j;
112:
113: for (i = 0;; i++) {
114: if (i == tabs.a.n) {
115: if (tabs.p.n == 0)
116: return prev;
117: tabs.a.n += tabs.p.n;
118: if (tabs.a.s < tabs.a.n) {
119: tabs.a.s = tabs.a.n;
120: tabs.a.t = mandoc_reallocarray(tabs.a.t,
121: tabs.a.s, sizeof(*tabs.a.t));
122: }
123: for (j = 0; j < tabs.p.n; j++)
124: tabs.a.t[i + j] = tabs.p.t[j] +
125: (i ? tabs.a.t[i - 1] : 0);
126: }
1.3 schwarze 127: if (prev < tabs.a.t[i])
128: return tabs.a.t[i];
1.1 schwarze 129: }
130: }
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