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Annotation of mandoc/term_tab.c, Revision 1.4

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:
1.4     ! schwarze   91: /*
        !            92:  * Simplified version without a parser,
        !            93:  * never incremental, never periodic, for use by tbl(7).
        !            94:  */
        !            95: void
        !            96: term_tab_iset(size_t inc)
        !            97: {
        !            98:        if (tabs.a.n >= tabs.a.s) {
        !            99:                tabs.a.s += 8;
        !           100:                tabs.a.t = mandoc_reallocarray(tabs.a.t, tabs.a.s,
        !           101:                    sizeof(*tabs.a.t));
        !           102:        }
        !           103:        tabs.a.t[tabs.a.n++] = inc;
        !           104: }
        !           105:
1.1       schwarze  106: size_t
                    107: term_tab_next(size_t prev)
                    108: {
                    109:        size_t   i, j;
                    110:
                    111:        for (i = 0;; i++) {
                    112:                if (i == tabs.a.n) {
                    113:                        if (tabs.p.n == 0)
                    114:                                return prev;
                    115:                        tabs.a.n += tabs.p.n;
                    116:                        if (tabs.a.s < tabs.a.n) {
                    117:                                tabs.a.s = tabs.a.n;
                    118:                                tabs.a.t = mandoc_reallocarray(tabs.a.t,
                    119:                                    tabs.a.s, sizeof(*tabs.a.t));
                    120:                        }
                    121:                        for (j = 0; j < tabs.p.n; j++)
                    122:                                tabs.a.t[i + j] = tabs.p.t[j] +
                    123:                                    (i ? tabs.a.t[i - 1] : 0);
                    124:                }
1.3       schwarze  125:                if (prev < tabs.a.t[i])
                    126:                        return tabs.a.t[i];
1.1       schwarze  127:        }
                    128: }

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