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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: }