Annotation of mandoc/term_tab.c, Revision 1.7
1.7 ! schwarze 1: /* $Id: term_tab.c,v 1.6 2020/06/22 19:20:40 schwarze Exp $ */
1.1 schwarze 2: /*
1.7 ! schwarze 3: * Copyright (c) 2017, 2021 Ingo Schwarze <schwarze@openbsd.org>
1.1 schwarze 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>
1.7 ! schwarze 22: #include <stdlib.h>
! 23: #include <string.h>
1.1 schwarze 24:
25: #include "mandoc_aux.h"
26: #include "out.h"
27: #include "term.h"
28:
29: struct tablist {
30: size_t *t; /* Allocated array of tab positions. */
31: size_t s; /* Allocated number of positions. */
32: size_t n; /* Currently used number of positions. */
33: };
34:
35: static struct {
36: struct tablist a; /* All tab positions for lookup. */
37: struct tablist p; /* Periodic tab positions to add. */
1.7 ! schwarze 38: struct tablist *r; /* Tablist currently being recorded. */
1.1 schwarze 39: size_t d; /* Default tab width in units of n. */
40: } tabs;
41:
42:
43: void
44: term_tab_set(const struct termp *p, const char *arg)
45: {
46: struct roffsu su;
47: struct tablist *tl;
48: size_t pos;
49: int add;
50:
51: /* Special arguments: clear all tabs or switch lists. */
52:
53: if (arg == NULL) {
54: tabs.a.n = tabs.p.n = 0;
1.7 ! schwarze 55: tabs.r = &tabs.a;
1.1 schwarze 56: if (tabs.d == 0) {
57: a2roffsu(".8i", &su, SCALE_IN);
1.3 schwarze 58: tabs.d = term_hen(p, &su);
1.1 schwarze 59: }
60: return;
61: }
62: if (arg[0] == 'T' && arg[1] == '\0') {
1.7 ! schwarze 63: tabs.r = &tabs.p;
1.1 schwarze 64: return;
65: }
66:
67: /* Parse the sign, the number, and the unit. */
68:
69: if (*arg == '+') {
70: add = 1;
71: arg++;
72: } else
73: add = 0;
1.2 schwarze 74: if (a2roffsu(arg, &su, SCALE_EM) == NULL)
1.1 schwarze 75: return;
76:
77: /* Select the list, and extend it if it is full. */
78:
1.7 ! schwarze 79: tl = tabs.r;
1.1 schwarze 80: if (tl->n >= tl->s) {
81: tl->s += 8;
82: tl->t = mandoc_reallocarray(tl->t, tl->s, sizeof(*tl->t));
83: }
84:
85: /* Append the new position. */
86:
1.3 schwarze 87: pos = term_hen(p, &su);
1.1 schwarze 88: tl->t[tl->n] = pos;
89: if (add && tl->n)
90: tl->t[tl->n] += tl->t[tl->n - 1];
91: tl->n++;
92: }
93:
1.4 schwarze 94: /*
95: * Simplified version without a parser,
96: * never incremental, never periodic, for use by tbl(7).
97: */
98: void
99: term_tab_iset(size_t inc)
100: {
101: if (tabs.a.n >= tabs.a.s) {
102: tabs.a.s += 8;
103: tabs.a.t = mandoc_reallocarray(tabs.a.t, tabs.a.s,
104: sizeof(*tabs.a.t));
105: }
106: tabs.a.t[tabs.a.n++] = inc;
107: }
108:
1.1 schwarze 109: size_t
110: term_tab_next(size_t prev)
111: {
112: size_t i, j;
113:
114: for (i = 0;; i++) {
115: if (i == tabs.a.n) {
116: if (tabs.p.n == 0)
117: return prev;
118: tabs.a.n += tabs.p.n;
119: if (tabs.a.s < tabs.a.n) {
120: tabs.a.s = tabs.a.n;
121: tabs.a.t = mandoc_reallocarray(tabs.a.t,
122: tabs.a.s, sizeof(*tabs.a.t));
123: }
124: for (j = 0; j < tabs.p.n; j++)
125: tabs.a.t[i + j] = tabs.p.t[j] +
126: (i ? tabs.a.t[i - 1] : 0);
127: }
1.3 schwarze 128: if (prev < tabs.a.t[i])
129: return tabs.a.t[i];
1.1 schwarze 130: }
1.7 ! schwarze 131: }
! 132:
! 133: void
! 134: term_tab_free(void)
! 135: {
! 136: free(tabs.a.t);
! 137: free(tabs.p.t);
! 138: memset(&tabs, 0, sizeof(tabs));
! 139: tabs.r = &tabs.a;
1.1 schwarze 140: }
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