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Annotation of mandoc/term.c, Revision 1.125

1.125   ! kristaps    1: /*     $Id: term.c,v 1.124 2009/11/07 14:14:16 kristaps Exp $ */
1.1       kristaps    2: /*
1.75      kristaps    3:  * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
1.1       kristaps    4:  *
                      5:  * Permission to use, copy, modify, and distribute this software for any
1.74      kristaps    6:  * purpose with or without fee is hereby granted, provided that the above
                      7:  * copyright notice and this permission notice appear in all copies.
1.1       kristaps    8:  *
1.74      kristaps    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.
1.1       kristaps   16:  */
                     17: #include <assert.h>
1.122     kristaps   18: #include <ctype.h>
1.22      kristaps   19: #include <stdio.h>
1.1       kristaps   20: #include <stdlib.h>
                     21: #include <string.h>
1.113     kristaps   22: #include <time.h>
1.1       kristaps   23:
1.101     kristaps   24: #include "chars.h"
1.107     kristaps   25: #include "out.h"
1.71      kristaps   26: #include "term.h"
                     27: #include "man.h"
                     28: #include "mdoc.h"
1.105     kristaps   29: #include "main.h"
1.1       kristaps   30:
1.71      kristaps   31: static struct termp     *term_alloc(enum termenc);
                     32: static void              term_free(struct termp *);
1.125   ! kristaps   33: static void              spec(struct termp *, const char *, size_t);
        !            34: static void              res(struct termp *, const char *, size_t);
        !            35: static void              buffera(struct termp *, const char *, size_t);
        !            36: static void              bufferc(struct termp *, char);
        !            37: static void              adjbuf(struct termp *p, size_t);
        !            38: static void              encode(struct termp *, const char *, size_t);
1.1       kristaps   39:
                     40:
1.71      kristaps   41: void *
                     42: ascii_alloc(void)
1.10      kristaps   43: {
1.1       kristaps   44:
1.71      kristaps   45:        return(term_alloc(TERMENC_ASCII));
1.1       kristaps   46: }
                     47:
                     48:
1.99      kristaps   49: void
1.71      kristaps   50: terminal_free(void *arg)
1.11      kristaps   51: {
                     52:
1.71      kristaps   53:        term_free((struct termp *)arg);
1.11      kristaps   54: }
                     55:
                     56:
1.71      kristaps   57: static void
                     58: term_free(struct termp *p)
1.14      kristaps   59: {
                     60:
1.71      kristaps   61:        if (p->buf)
                     62:                free(p->buf);
1.102     kristaps   63:        if (p->symtab)
1.101     kristaps   64:                chars_free(p->symtab);
1.14      kristaps   65:
1.71      kristaps   66:        free(p);
1.14      kristaps   67: }
                     68:
                     69:
1.71      kristaps   70: static struct termp *
                     71: term_alloc(enum termenc enc)
1.14      kristaps   72: {
1.71      kristaps   73:        struct termp *p;
1.14      kristaps   74:
1.117     kristaps   75:        p = calloc(1, sizeof(struct termp));
                     76:        if (NULL == p) {
1.120     kristaps   77:                perror(NULL);
1.117     kristaps   78:                exit(EXIT_FAILURE);
                     79:        }
1.80      kristaps   80:        p->maxrmargin = 78;
1.71      kristaps   81:        p->enc = enc;
                     82:        return(p);
1.14      kristaps   83: }
                     84:
                     85:
1.71      kristaps   86: /*
                     87:  * Flush a line of text.  A "line" is loosely defined as being something
                     88:  * that should be followed by a newline, regardless of whether it's
                     89:  * broken apart by newlines getting there.  A line can also be a
                     90:  * fragment of a columnar list.
                     91:  *
                     92:  * Specifically, a line is whatever's in p->buf of length p->col, which
                     93:  * is zeroed after this function returns.
                     94:  *
1.84      kristaps   95:  * The usage of termp:flags is as follows:
1.71      kristaps   96:  *
                     97:  *  - TERMP_NOLPAD: when beginning to write the line, don't left-pad the
                     98:  *    offset value.  This is useful when doing columnar lists where the
                     99:  *    prior column has right-padded.
                    100:  *
                    101:  *  - TERMP_NOBREAK: this is the most important and is used when making
                    102:  *    columns.  In short: don't print a newline and instead pad to the
                    103:  *    right margin.  Used in conjunction with TERMP_NOLPAD.
                    104:  *
1.91      kristaps  105:  *  - TERMP_TWOSPACE: when padding, make sure there are at least two
                    106:  *    space characters of padding.  Otherwise, rather break the line.
                    107:  *
1.84      kristaps  108:  *  - TERMP_DANGLE: don't newline when TERMP_NOBREAK is specified and
                    109:  *    the line is overrun, and don't pad-right if it's underrun.
                    110:  *
                    111:  *  - TERMP_HANG: like TERMP_DANGLE, but doesn't newline when
                    112:  *    overruning, instead save the position and continue at that point
                    113:  *    when the next invocation.
1.71      kristaps  114:  *
                    115:  *  In-line line breaking:
                    116:  *
                    117:  *  If TERMP_NOBREAK is specified and the line overruns the right
                    118:  *  margin, it will break and pad-right to the right margin after
                    119:  *  writing.  If maxrmargin is violated, it will break and continue
1.114     kristaps  120:  *  writing from the right-margin, which will lead to the above scenario
                    121:  *  upon exit.  Otherwise, the line will break at the right margin.
1.71      kristaps  122:  */
                    123: void
                    124: term_flushln(struct termp *p)
1.53      kristaps  125: {
1.114     kristaps  126:        int              i;     /* current input position in p->buf */
                    127:        size_t           vis;   /* current visual position on output */
                    128:        size_t           vbl;   /* number of blanks to prepend to output */
                    129:        size_t           vsz;   /* visual characters to write to output */
                    130:        size_t           bp;    /* visual right border position */
                    131:        int              j;     /* temporary loop index */
                    132:        size_t           maxvis, mmax;
1.91      kristaps  133:        static int       overstep = 0;
1.53      kristaps  134:
1.71      kristaps  135:        /*
                    136:         * First, establish the maximum columns of "visible" content.
                    137:         * This is usually the difference between the right-margin and
                    138:         * an indentation, but can be, for tagged lists or columns, a
1.115     kristaps  139:         * small set of values.
1.71      kristaps  140:         */
1.53      kristaps  141:
1.71      kristaps  142:        assert(p->offset < p->rmargin);
1.92      kristaps  143:
1.114     kristaps  144:        maxvis = (int)(p->rmargin - p->offset) - overstep < 0 ?
1.119     kristaps  145:                /* LINTED */
                    146:                0 : p->rmargin - p->offset - overstep;
1.114     kristaps  147:        mmax = (int)(p->maxrmargin - p->offset) - overstep < 0 ?
1.119     kristaps  148:                /* LINTED */
                    149:                0 : p->maxrmargin - p->offset - overstep;
1.92      kristaps  150:
1.71      kristaps  151:        bp = TERMP_NOBREAK & p->flags ? mmax : maxvis;
1.115     kristaps  152:
                    153:        /*
                    154:         * FIXME: if bp is zero, we still output the first word before
                    155:         * breaking the line.
                    156:         */
                    157:
1.71      kristaps  158:        vis = 0;
1.84      kristaps  159:
1.71      kristaps  160:        /*
                    161:         * If in the standard case (left-justified), then begin with our
                    162:         * indentation, otherwise (columns, etc.) just start spitting
                    163:         * out text.
                    164:         */
1.53      kristaps  165:
1.71      kristaps  166:        if ( ! (p->flags & TERMP_NOLPAD))
                    167:                /* LINTED */
                    168:                for (j = 0; j < (int)p->offset; j++)
                    169:                        putchar(' ');
                    170:
                    171:        for (i = 0; i < (int)p->col; i++) {
                    172:                /*
                    173:                 * Count up visible word characters.  Control sequences
                    174:                 * (starting with the CSI) aren't counted.  A space
                    175:                 * generates a non-printing word, which is valid (the
                    176:                 * space is printed according to regular spacing rules).
                    177:                 */
                    178:
                    179:                /* LINTED */
                    180:                for (j = i, vsz = 0; j < (int)p->col; j++) {
1.93      kristaps  181:                        if (j && ' ' == p->buf[j])
1.71      kristaps  182:                                break;
                    183:                        else if (8 == p->buf[j])
1.89      kristaps  184:                                vsz--;
1.71      kristaps  185:                        else
                    186:                                vsz++;
                    187:                }
1.53      kristaps  188:
1.71      kristaps  189:                /*
1.81      kristaps  190:                 * Choose the number of blanks to prepend: no blank at the
                    191:                 * beginning of a line, one between words -- but do not
                    192:                 * actually write them yet.
1.71      kristaps  193:                 */
1.81      kristaps  194:                vbl = (size_t)(0 == vis ? 0 : 1);
1.71      kristaps  195:
1.81      kristaps  196:                /*
                    197:                 * Find out whether we would exceed the right margin.
                    198:                 * If so, break to the next line.  (TODO: hyphenate)
                    199:                 * Otherwise, write the chosen number of blanks now.
                    200:                 */
                    201:                if (vis && vis + vbl + vsz > bp) {
                    202:                        putchar('\n');
                    203:                        if (TERMP_NOBREAK & p->flags) {
                    204:                                for (j = 0; j < (int)p->rmargin; j++)
                    205:                                        putchar(' ');
                    206:                                vis = p->rmargin - p->offset;
                    207:                        } else {
1.71      kristaps  208:                                for (j = 0; j < (int)p->offset; j++)
                    209:                                        putchar(' ');
                    210:                                vis = 0;
1.81      kristaps  211:                        }
1.104     kristaps  212:                        /* Remove the overstep width. */
1.112     kristaps  213:                        bp += (int)/* LINTED */
                    214:                                overstep;
1.110     kristaps  215:                        overstep = 0;
1.81      kristaps  216:                } else {
                    217:                        for (j = 0; j < (int)vbl; j++)
1.71      kristaps  218:                                putchar(' ');
1.81      kristaps  219:                        vis += vbl;
1.71      kristaps  220:                }
1.53      kristaps  221:
1.78      kristaps  222:                /*
1.81      kristaps  223:                 * Finally, write out the word.
1.71      kristaps  224:                 */
                    225:                for ( ; i < (int)p->col; i++) {
                    226:                        if (' ' == p->buf[i])
                    227:                                break;
1.121     kristaps  228:
                    229:                        /* The unit sep. is a non-breaking space. */
                    230:                        if (31 == p->buf[i])
                    231:                                putchar(' ');
                    232:                        else
                    233:                                putchar(p->buf[i]);
1.71      kristaps  234:                }
                    235:                vis += vsz;
                    236:        }
1.111     kristaps  237:
1.91      kristaps  238:        p->col = 0;
1.111     kristaps  239:        overstep = 0;
1.15      kristaps  240:
1.91      kristaps  241:        if ( ! (TERMP_NOBREAK & p->flags)) {
                    242:                putchar('\n');
1.15      kristaps  243:                return;
1.71      kristaps  244:        }
1.15      kristaps  245:
1.91      kristaps  246:        if (TERMP_HANG & p->flags) {
                    247:                /* We need one blank after the tag. */
1.92      kristaps  248:                overstep = /* LINTED */
                    249:                        vis - maxvis + 1;
1.91      kristaps  250:
                    251:                /*
                    252:                 * Behave exactly the same way as groff:
1.92      kristaps  253:                 * If we have overstepped the margin, temporarily move
                    254:                 * it to the right and flag the rest of the line to be
                    255:                 * shorter.
1.91      kristaps  256:                 * If we landed right at the margin, be happy.
1.92      kristaps  257:                 * If we are one step before the margin, temporarily
                    258:                 * move it one step LEFT and flag the rest of the line
                    259:                 * to be longer.
1.91      kristaps  260:                 */
1.92      kristaps  261:                if (overstep >= -1) {
                    262:                        assert((int)maxvis + overstep >= 0);
                    263:                        /* LINTED */
1.91      kristaps  264:                        maxvis += overstep;
1.92      kristaps  265:                } else
1.91      kristaps  266:                        overstep = 0;
                    267:
                    268:        } else if (TERMP_DANGLE & p->flags)
                    269:                return;
1.15      kristaps  270:
1.92      kristaps  271:        /* Right-pad. */
                    272:        if (maxvis > vis + /* LINTED */
                    273:                        ((TERMP_TWOSPACE & p->flags) ? 1 : 0))
1.91      kristaps  274:                for ( ; vis < maxvis; vis++)
                    275:                        putchar(' ');
1.92      kristaps  276:        else {  /* ...or newline break. */
1.71      kristaps  277:                putchar('\n');
1.91      kristaps  278:                for (i = 0; i < (int)p->rmargin; i++)
                    279:                        putchar(' ');
                    280:        }
1.15      kristaps  281: }
                    282:
                    283:
1.71      kristaps  284: /*
                    285:  * A newline only breaks an existing line; it won't assert vertical
                    286:  * space.  All data in the output buffer is flushed prior to the newline
                    287:  * assertion.
                    288:  */
                    289: void
                    290: term_newln(struct termp *p)
1.15      kristaps  291: {
                    292:
1.71      kristaps  293:        p->flags |= TERMP_NOSPACE;
                    294:        if (0 == p->col) {
                    295:                p->flags &= ~TERMP_NOLPAD;
1.15      kristaps  296:                return;
1.16      kristaps  297:        }
1.71      kristaps  298:        term_flushln(p);
                    299:        p->flags &= ~TERMP_NOLPAD;
1.16      kristaps  300: }
                    301:
                    302:
1.71      kristaps  303: /*
                    304:  * Asserts a vertical space (a full, empty line-break between lines).
                    305:  * Note that if used twice, this will cause two blank spaces and so on.
                    306:  * All data in the output buffer is flushed prior to the newline
                    307:  * assertion.
                    308:  */
                    309: void
                    310: term_vspace(struct termp *p)
1.16      kristaps  311: {
                    312:
1.62      kristaps  313:        term_newln(p);
1.71      kristaps  314:        putchar('\n');
1.16      kristaps  315: }
                    316:
                    317:
1.71      kristaps  318: static void
1.125   ! kristaps  319: spec(struct termp *p, const char *word, size_t len)
1.17      kristaps  320: {
1.71      kristaps  321:        const char      *rhs;
                    322:        size_t           sz;
1.17      kristaps  323:
1.101     kristaps  324:        rhs = chars_a2ascii(p->symtab, word, len, &sz);
1.125   ! kristaps  325:        if (rhs)
        !           326:                encode(p, rhs, sz);
1.94      kristaps  327: }
                    328:
                    329:
                    330: static void
1.125   ! kristaps  331: res(struct termp *p, const char *word, size_t len)
1.94      kristaps  332: {
                    333:        const char      *rhs;
                    334:        size_t           sz;
                    335:
1.101     kristaps  336:        rhs = chars_a2res(p->symtab, word, len, &sz);
1.125   ! kristaps  337:        if (rhs)
        !           338:                encode(p, rhs, sz);
        !           339: }
        !           340:
        !           341:
        !           342: void
        !           343: term_fontlast(struct termp *p)
        !           344: {
        !           345:        enum termfont    f;
        !           346:
        !           347:        f = p->fontl;
        !           348:        p->fontl = p->fontq[p->fonti];
        !           349:        p->fontq[p->fonti] = f;
        !           350: }
        !           351:
        !           352:
        !           353: void
        !           354: term_fontrepl(struct termp *p, enum termfont f)
        !           355: {
        !           356:
        !           357:        p->fontl = p->fontq[p->fonti];
        !           358:        p->fontq[p->fonti] = f;
        !           359: }
        !           360:
        !           361:
        !           362: void
        !           363: term_fontpush(struct termp *p, enum termfont f)
        !           364: {
        !           365:
        !           366:        assert(p->fonti + 1 < 10);
        !           367:        p->fontl = p->fontq[p->fonti];
        !           368:        p->fontq[++p->fonti] = f;
        !           369: }
        !           370:
        !           371:
        !           372: const void *
        !           373: term_fontq(struct termp *p)
        !           374: {
        !           375:
        !           376:        return(&p->fontq[p->fonti]);
        !           377: }
        !           378:
        !           379:
        !           380: enum termfont
        !           381: term_fonttop(struct termp *p)
        !           382: {
        !           383:
        !           384:        return(p->fontq[p->fonti]);
        !           385: }
        !           386:
        !           387:
        !           388: void
        !           389: term_fontpopq(struct termp *p, const void *key)
        !           390: {
        !           391:
        !           392:        while (p->fonti >= 0 && key != &p->fontq[p->fonti])
        !           393:                p->fonti--;
        !           394:        assert(p->fonti >= 0);
        !           395: }
1.94      kristaps  396:
1.125   ! kristaps  397:
        !           398: void
        !           399: term_fontpop(struct termp *p)
        !           400: {
        !           401:
        !           402:        assert(p->fonti);
        !           403:        p->fonti--;
1.17      kristaps  404: }
                    405:
                    406:
1.71      kristaps  407: /*
                    408:  * Handle pwords, partial words, which may be either a single word or a
                    409:  * phrase that cannot be broken down (such as a literal string).  This
                    410:  * handles word styling.
                    411:  */
1.86      kristaps  412: void
                    413: term_word(struct termp *p, const char *word)
1.65      kristaps  414: {
1.124     kristaps  415:        const char      *sv, *seq;
1.125   ! kristaps  416:        int              sz;
1.124     kristaps  417:        size_t           ssz;
                    418:        enum roffdeco    deco;
1.71      kristaps  419:
1.100     kristaps  420:        sv = word;
                    421:
1.123     kristaps  422:        if (word[0] && '\0' == word[1])
1.100     kristaps  423:                switch (word[0]) {
                    424:                case('.'):
                    425:                        /* FALLTHROUGH */
                    426:                case(','):
                    427:                        /* FALLTHROUGH */
                    428:                case(';'):
                    429:                        /* FALLTHROUGH */
                    430:                case(':'):
                    431:                        /* FALLTHROUGH */
                    432:                case('?'):
                    433:                        /* FALLTHROUGH */
                    434:                case('!'):
                    435:                        /* FALLTHROUGH */
                    436:                case(')'):
                    437:                        /* FALLTHROUGH */
                    438:                case(']'):
                    439:                        /* FALLTHROUGH */
                    440:                case('}'):
                    441:                        if ( ! (TERMP_IGNDELIM & p->flags))
                    442:                                p->flags |= TERMP_NOSPACE;
                    443:                        break;
                    444:                default:
                    445:                        break;
                    446:                }
1.65      kristaps  447:
1.71      kristaps  448:        if ( ! (TERMP_NOSPACE & p->flags))
1.125   ! kristaps  449:                bufferc(p, ' ');
1.65      kristaps  450:
1.71      kristaps  451:        if ( ! (p->flags & TERMP_NONOSPACE))
                    452:                p->flags &= ~TERMP_NOSPACE;
1.65      kristaps  453:
1.125   ! kristaps  454:        /* FIXME: use strcspn. */
1.124     kristaps  455:
                    456:        while (*word) {
                    457:                if ('\\' != *word) {
1.125   ! kristaps  458:                        encode(p, word, 1);
1.124     kristaps  459:                        word++;
                    460:                        continue;
                    461:                }
                    462:
                    463:                seq = ++word;
                    464:                sz = a2roffdeco(&deco, &seq, &ssz);
                    465:
                    466:                switch (deco) {
                    467:                case (DECO_RESERVED):
1.125   ! kristaps  468:                        res(p, seq, ssz);
1.124     kristaps  469:                        break;
                    470:                case (DECO_SPECIAL):
1.125   ! kristaps  471:                        spec(p, seq, ssz);
1.124     kristaps  472:                        break;
                    473:                case (DECO_BOLD):
1.125   ! kristaps  474:                        term_fontrepl(p, TERMFONT_BOLD);
1.124     kristaps  475:                        break;
                    476:                case (DECO_ITALIC):
1.125   ! kristaps  477:                        term_fontrepl(p, TERMFONT_UNDER);
1.124     kristaps  478:                        break;
                    479:                case (DECO_ROMAN):
1.125   ! kristaps  480:                        term_fontrepl(p, TERMFONT_NONE);
1.124     kristaps  481:                        break;
                    482:                case (DECO_PREVIOUS):
1.125   ! kristaps  483:                        term_fontlast(p);
1.124     kristaps  484:                        break;
                    485:                default:
                    486:                        break;
                    487:                }
                    488:                word += sz;
                    489:        }
1.65      kristaps  490:
1.100     kristaps  491:        if (sv[0] && 0 == sv[1])
                    492:                switch (sv[0]) {
                    493:                case('('):
                    494:                        /* FALLTHROUGH */
                    495:                case('['):
                    496:                        /* FALLTHROUGH */
                    497:                case('{'):
                    498:                        p->flags |= TERMP_NOSPACE;
                    499:                        break;
                    500:                default:
                    501:                        break;
                    502:                }
1.65      kristaps  503: }
                    504:
                    505:
1.71      kristaps  506: static void
1.125   ! kristaps  507: adjbuf(struct termp *p, size_t sz)
1.51      kristaps  508: {
                    509:
1.125   ! kristaps  510:        if (0 == p->maxcols)
        !           511:                p->maxcols = 1024;
        !           512:        while (sz >= p->maxcols)
        !           513:                p->maxcols <<= 2;
        !           514:
        !           515:        p->buf = realloc(p->buf, p->maxcols);
        !           516:        if (NULL == p->buf) {
        !           517:                perror(NULL);
        !           518:                exit(EXIT_FAILURE);
1.71      kristaps  519:        }
1.51      kristaps  520: }
                    521:
1.79      kristaps  522:
                    523: static void
1.125   ! kristaps  524: buffera(struct termp *p, const char *word, size_t sz)
1.79      kristaps  525: {
1.125   ! kristaps  526:
        !           527:        if (p->col + sz >= p->maxcols)
        !           528:                adjbuf(p, p->col + sz);
        !           529:
        !           530:        memcpy(&p->buf[p->col], word, sz);
        !           531:        p->col += sz;
        !           532: }
        !           533:
        !           534:
        !           535: static void
        !           536: bufferc(struct termp *p, char c)
        !           537: {
        !           538:
        !           539:        if (p->col + 1 >= p->maxcols)
        !           540:                adjbuf(p, p->col + 1);
        !           541:
        !           542:        p->buf[p->col++] = c;
        !           543: }
        !           544:
        !           545:
        !           546: static void
        !           547: encode(struct termp *p, const char *word, size_t sz)
        !           548: {
        !           549:        enum termfont     f;
        !           550:        int               i;
        !           551:
        !           552:        /*
        !           553:         * Encode and buffer a string of characters.  If the current
        !           554:         * font mode is unset, buffer directly, else encode then buffer
        !           555:         * character by character.
        !           556:         */
        !           557:
        !           558:        if (TERMFONT_NONE == (f = term_fonttop(p))) {
        !           559:                buffera(p, word, sz);
        !           560:                return;
        !           561:        }
        !           562:
        !           563:        for (i = 0; i < (int)sz; i++) {
        !           564:                if ( ! isgraph((u_char)word[i])) {
        !           565:                        bufferc(p, word[i]);
        !           566:                        continue;
1.79      kristaps  567:                }
1.125   ! kristaps  568:
        !           569:                if (TERMFONT_UNDER == f)
        !           570:                        bufferc(p, '_');
        !           571:                else
        !           572:                        bufferc(p, word[i]);
        !           573:
        !           574:                bufferc(p, 8);
        !           575:                bufferc(p, word[i]);
1.79      kristaps  576:        }
                    577: }
1.106     kristaps  578:
                    579:
1.107     kristaps  580: size_t
                    581: term_vspan(const struct roffsu *su)
1.106     kristaps  582: {
                    583:        double           r;
                    584:
1.107     kristaps  585:        switch (su->unit) {
1.106     kristaps  586:        case (SCALE_CM):
1.107     kristaps  587:                r = su->scale * 2;
1.106     kristaps  588:                break;
                    589:        case (SCALE_IN):
1.107     kristaps  590:                r = su->scale * 6;
1.106     kristaps  591:                break;
                    592:        case (SCALE_PC):
1.107     kristaps  593:                r = su->scale;
1.106     kristaps  594:                break;
                    595:        case (SCALE_PT):
1.107     kristaps  596:                r = su->scale / 8;
1.106     kristaps  597:                break;
                    598:        case (SCALE_MM):
1.107     kristaps  599:                r = su->scale / 1000;
1.106     kristaps  600:                break;
                    601:        case (SCALE_VS):
1.107     kristaps  602:                r = su->scale;
1.106     kristaps  603:                break;
                    604:        default:
1.107     kristaps  605:                r = su->scale - 1;
1.106     kristaps  606:                break;
                    607:        }
                    608:
                    609:        if (r < 0.0)
                    610:                r = 0.0;
1.107     kristaps  611:        return(/* LINTED */(size_t)
1.106     kristaps  612:                        r);
                    613: }
                    614:
                    615:
1.107     kristaps  616: size_t
                    617: term_hspan(const struct roffsu *su)
1.106     kristaps  618: {
                    619:        double           r;
                    620:
1.108     kristaps  621:        /* XXX: CM, IN, and PT are approximations. */
                    622:
1.107     kristaps  623:        switch (su->unit) {
1.106     kristaps  624:        case (SCALE_CM):
1.108     kristaps  625:                r = 4 * su->scale;
1.106     kristaps  626:                break;
                    627:        case (SCALE_IN):
1.108     kristaps  628:                /* XXX: this is an approximation. */
                    629:                r = 10 * su->scale;
1.106     kristaps  630:                break;
                    631:        case (SCALE_PC):
1.108     kristaps  632:                r = (10 * su->scale) / 6;
1.106     kristaps  633:                break;
                    634:        case (SCALE_PT):
1.108     kristaps  635:                r = (10 * su->scale) / 72;
1.106     kristaps  636:                break;
                    637:        case (SCALE_MM):
1.107     kristaps  638:                r = su->scale / 1000; /* FIXME: double-check. */
1.106     kristaps  639:                break;
                    640:        case (SCALE_VS):
1.107     kristaps  641:                r = su->scale * 2 - 1; /* FIXME: double-check. */
1.106     kristaps  642:                break;
                    643:        default:
1.107     kristaps  644:                r = su->scale;
1.106     kristaps  645:                break;
                    646:        }
                    647:
                    648:        if (r < 0.0)
                    649:                r = 0.0;
1.107     kristaps  650:        return((size_t)/* LINTED */
1.106     kristaps  651:                        r);
                    652: }
                    653:
                    654:

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