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Annotation of mandoc/term.c, Revision 1.127

1.127   ! kristaps    1: /*     $Id: term.c,v 1.126 2009/11/12 05:58:30 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:  */
1.126     kristaps   17: #include <sys/types.h>
                     18:
1.1       kristaps   19: #include <assert.h>
1.122     kristaps   20: #include <ctype.h>
1.22      kristaps   21: #include <stdio.h>
1.1       kristaps   22: #include <stdlib.h>
                     23: #include <string.h>
1.113     kristaps   24: #include <time.h>
1.1       kristaps   25:
1.101     kristaps   26: #include "chars.h"
1.107     kristaps   27: #include "out.h"
1.71      kristaps   28: #include "term.h"
                     29: #include "man.h"
                     30: #include "mdoc.h"
1.105     kristaps   31: #include "main.h"
1.1       kristaps   32:
1.71      kristaps   33: static struct termp     *term_alloc(enum termenc);
                     34: static void              term_free(struct termp *);
1.125     kristaps   35: static void              spec(struct termp *, const char *, size_t);
                     36: static void              res(struct termp *, const char *, size_t);
                     37: static void              buffera(struct termp *, const char *, size_t);
                     38: static void              bufferc(struct termp *, char);
                     39: static void              adjbuf(struct termp *p, size_t);
                     40: static void              encode(struct termp *, const char *, size_t);
1.1       kristaps   41:
                     42:
1.71      kristaps   43: void *
                     44: ascii_alloc(void)
1.10      kristaps   45: {
1.1       kristaps   46:
1.71      kristaps   47:        return(term_alloc(TERMENC_ASCII));
1.1       kristaps   48: }
                     49:
                     50:
1.99      kristaps   51: void
1.71      kristaps   52: terminal_free(void *arg)
1.11      kristaps   53: {
                     54:
1.71      kristaps   55:        term_free((struct termp *)arg);
1.11      kristaps   56: }
                     57:
                     58:
1.71      kristaps   59: static void
                     60: term_free(struct termp *p)
1.14      kristaps   61: {
                     62:
1.71      kristaps   63:        if (p->buf)
                     64:                free(p->buf);
1.102     kristaps   65:        if (p->symtab)
1.101     kristaps   66:                chars_free(p->symtab);
1.14      kristaps   67:
1.71      kristaps   68:        free(p);
1.14      kristaps   69: }
                     70:
                     71:
1.71      kristaps   72: static struct termp *
                     73: term_alloc(enum termenc enc)
1.14      kristaps   74: {
1.71      kristaps   75:        struct termp *p;
1.14      kristaps   76:
1.117     kristaps   77:        p = calloc(1, sizeof(struct termp));
                     78:        if (NULL == p) {
1.120     kristaps   79:                perror(NULL);
1.117     kristaps   80:                exit(EXIT_FAILURE);
                     81:        }
1.80      kristaps   82:        p->maxrmargin = 78;
1.71      kristaps   83:        p->enc = enc;
                     84:        return(p);
1.14      kristaps   85: }
                     86:
                     87:
1.71      kristaps   88: /*
                     89:  * Flush a line of text.  A "line" is loosely defined as being something
                     90:  * that should be followed by a newline, regardless of whether it's
                     91:  * broken apart by newlines getting there.  A line can also be a
                     92:  * fragment of a columnar list.
                     93:  *
                     94:  * Specifically, a line is whatever's in p->buf of length p->col, which
                     95:  * is zeroed after this function returns.
                     96:  *
1.84      kristaps   97:  * The usage of termp:flags is as follows:
1.71      kristaps   98:  *
                     99:  *  - TERMP_NOLPAD: when beginning to write the line, don't left-pad the
                    100:  *    offset value.  This is useful when doing columnar lists where the
                    101:  *    prior column has right-padded.
                    102:  *
                    103:  *  - TERMP_NOBREAK: this is the most important and is used when making
                    104:  *    columns.  In short: don't print a newline and instead pad to the
                    105:  *    right margin.  Used in conjunction with TERMP_NOLPAD.
                    106:  *
1.91      kristaps  107:  *  - TERMP_TWOSPACE: when padding, make sure there are at least two
                    108:  *    space characters of padding.  Otherwise, rather break the line.
                    109:  *
1.84      kristaps  110:  *  - TERMP_DANGLE: don't newline when TERMP_NOBREAK is specified and
                    111:  *    the line is overrun, and don't pad-right if it's underrun.
                    112:  *
                    113:  *  - TERMP_HANG: like TERMP_DANGLE, but doesn't newline when
                    114:  *    overruning, instead save the position and continue at that point
                    115:  *    when the next invocation.
1.71      kristaps  116:  *
                    117:  *  In-line line breaking:
                    118:  *
                    119:  *  If TERMP_NOBREAK is specified and the line overruns the right
                    120:  *  margin, it will break and pad-right to the right margin after
                    121:  *  writing.  If maxrmargin is violated, it will break and continue
1.114     kristaps  122:  *  writing from the right-margin, which will lead to the above scenario
                    123:  *  upon exit.  Otherwise, the line will break at the right margin.
1.71      kristaps  124:  */
                    125: void
                    126: term_flushln(struct termp *p)
1.53      kristaps  127: {
1.114     kristaps  128:        int              i;     /* current input position in p->buf */
                    129:        size_t           vis;   /* current visual position on output */
                    130:        size_t           vbl;   /* number of blanks to prepend to output */
                    131:        size_t           vsz;   /* visual characters to write to output */
                    132:        size_t           bp;    /* visual right border position */
                    133:        int              j;     /* temporary loop index */
                    134:        size_t           maxvis, mmax;
1.91      kristaps  135:        static int       overstep = 0;
1.53      kristaps  136:
1.71      kristaps  137:        /*
                    138:         * First, establish the maximum columns of "visible" content.
                    139:         * This is usually the difference between the right-margin and
                    140:         * an indentation, but can be, for tagged lists or columns, a
1.115     kristaps  141:         * small set of values.
1.71      kristaps  142:         */
1.53      kristaps  143:
1.71      kristaps  144:        assert(p->offset < p->rmargin);
1.92      kristaps  145:
1.114     kristaps  146:        maxvis = (int)(p->rmargin - p->offset) - overstep < 0 ?
1.119     kristaps  147:                /* LINTED */
                    148:                0 : p->rmargin - p->offset - overstep;
1.114     kristaps  149:        mmax = (int)(p->maxrmargin - p->offset) - overstep < 0 ?
1.119     kristaps  150:                /* LINTED */
                    151:                0 : p->maxrmargin - p->offset - overstep;
1.92      kristaps  152:
1.71      kristaps  153:        bp = TERMP_NOBREAK & p->flags ? mmax : maxvis;
1.115     kristaps  154:
                    155:        /*
                    156:         * FIXME: if bp is zero, we still output the first word before
                    157:         * breaking the line.
                    158:         */
                    159:
1.71      kristaps  160:        vis = 0;
1.84      kristaps  161:
1.71      kristaps  162:        /*
                    163:         * If in the standard case (left-justified), then begin with our
                    164:         * indentation, otherwise (columns, etc.) just start spitting
                    165:         * out text.
                    166:         */
1.53      kristaps  167:
1.71      kristaps  168:        if ( ! (p->flags & TERMP_NOLPAD))
                    169:                /* LINTED */
                    170:                for (j = 0; j < (int)p->offset; j++)
                    171:                        putchar(' ');
                    172:
                    173:        for (i = 0; i < (int)p->col; i++) {
                    174:                /*
                    175:                 * Count up visible word characters.  Control sequences
                    176:                 * (starting with the CSI) aren't counted.  A space
                    177:                 * generates a non-printing word, which is valid (the
                    178:                 * space is printed according to regular spacing rules).
                    179:                 */
                    180:
                    181:                /* LINTED */
                    182:                for (j = i, vsz = 0; j < (int)p->col; j++) {
1.93      kristaps  183:                        if (j && ' ' == p->buf[j])
1.71      kristaps  184:                                break;
                    185:                        else if (8 == p->buf[j])
1.89      kristaps  186:                                vsz--;
1.71      kristaps  187:                        else
                    188:                                vsz++;
                    189:                }
1.53      kristaps  190:
1.71      kristaps  191:                /*
1.81      kristaps  192:                 * Choose the number of blanks to prepend: no blank at the
                    193:                 * beginning of a line, one between words -- but do not
                    194:                 * actually write them yet.
1.71      kristaps  195:                 */
1.81      kristaps  196:                vbl = (size_t)(0 == vis ? 0 : 1);
1.71      kristaps  197:
1.81      kristaps  198:                /*
                    199:                 * Find out whether we would exceed the right margin.
                    200:                 * If so, break to the next line.  (TODO: hyphenate)
                    201:                 * Otherwise, write the chosen number of blanks now.
                    202:                 */
                    203:                if (vis && vis + vbl + vsz > bp) {
                    204:                        putchar('\n');
                    205:                        if (TERMP_NOBREAK & p->flags) {
                    206:                                for (j = 0; j < (int)p->rmargin; j++)
                    207:                                        putchar(' ');
                    208:                                vis = p->rmargin - p->offset;
                    209:                        } else {
1.71      kristaps  210:                                for (j = 0; j < (int)p->offset; j++)
                    211:                                        putchar(' ');
                    212:                                vis = 0;
1.81      kristaps  213:                        }
1.104     kristaps  214:                        /* Remove the overstep width. */
1.112     kristaps  215:                        bp += (int)/* LINTED */
                    216:                                overstep;
1.110     kristaps  217:                        overstep = 0;
1.81      kristaps  218:                } else {
                    219:                        for (j = 0; j < (int)vbl; j++)
1.71      kristaps  220:                                putchar(' ');
1.81      kristaps  221:                        vis += vbl;
1.71      kristaps  222:                }
1.53      kristaps  223:
1.78      kristaps  224:                /*
1.81      kristaps  225:                 * Finally, write out the word.
1.71      kristaps  226:                 */
                    227:                for ( ; i < (int)p->col; i++) {
                    228:                        if (' ' == p->buf[i])
                    229:                                break;
1.121     kristaps  230:
                    231:                        /* The unit sep. is a non-breaking space. */
                    232:                        if (31 == p->buf[i])
                    233:                                putchar(' ');
                    234:                        else
                    235:                                putchar(p->buf[i]);
1.71      kristaps  236:                }
                    237:                vis += vsz;
                    238:        }
1.111     kristaps  239:
1.91      kristaps  240:        p->col = 0;
1.111     kristaps  241:        overstep = 0;
1.15      kristaps  242:
1.91      kristaps  243:        if ( ! (TERMP_NOBREAK & p->flags)) {
                    244:                putchar('\n');
1.15      kristaps  245:                return;
1.71      kristaps  246:        }
1.15      kristaps  247:
1.91      kristaps  248:        if (TERMP_HANG & p->flags) {
                    249:                /* We need one blank after the tag. */
1.92      kristaps  250:                overstep = /* LINTED */
                    251:                        vis - maxvis + 1;
1.91      kristaps  252:
                    253:                /*
                    254:                 * Behave exactly the same way as groff:
1.92      kristaps  255:                 * If we have overstepped the margin, temporarily move
                    256:                 * it to the right and flag the rest of the line to be
                    257:                 * shorter.
1.91      kristaps  258:                 * If we landed right at the margin, be happy.
1.92      kristaps  259:                 * If we are one step before the margin, temporarily
                    260:                 * move it one step LEFT and flag the rest of the line
                    261:                 * to be longer.
1.91      kristaps  262:                 */
1.92      kristaps  263:                if (overstep >= -1) {
                    264:                        assert((int)maxvis + overstep >= 0);
                    265:                        /* LINTED */
1.91      kristaps  266:                        maxvis += overstep;
1.92      kristaps  267:                } else
1.91      kristaps  268:                        overstep = 0;
                    269:
                    270:        } else if (TERMP_DANGLE & p->flags)
                    271:                return;
1.15      kristaps  272:
1.92      kristaps  273:        /* Right-pad. */
                    274:        if (maxvis > vis + /* LINTED */
                    275:                        ((TERMP_TWOSPACE & p->flags) ? 1 : 0))
1.91      kristaps  276:                for ( ; vis < maxvis; vis++)
                    277:                        putchar(' ');
1.92      kristaps  278:        else {  /* ...or newline break. */
1.71      kristaps  279:                putchar('\n');
1.91      kristaps  280:                for (i = 0; i < (int)p->rmargin; i++)
                    281:                        putchar(' ');
                    282:        }
1.15      kristaps  283: }
                    284:
                    285:
1.71      kristaps  286: /*
                    287:  * A newline only breaks an existing line; it won't assert vertical
                    288:  * space.  All data in the output buffer is flushed prior to the newline
                    289:  * assertion.
                    290:  */
                    291: void
                    292: term_newln(struct termp *p)
1.15      kristaps  293: {
                    294:
1.71      kristaps  295:        p->flags |= TERMP_NOSPACE;
                    296:        if (0 == p->col) {
                    297:                p->flags &= ~TERMP_NOLPAD;
1.15      kristaps  298:                return;
1.16      kristaps  299:        }
1.71      kristaps  300:        term_flushln(p);
                    301:        p->flags &= ~TERMP_NOLPAD;
1.16      kristaps  302: }
                    303:
                    304:
1.71      kristaps  305: /*
                    306:  * Asserts a vertical space (a full, empty line-break between lines).
                    307:  * Note that if used twice, this will cause two blank spaces and so on.
                    308:  * All data in the output buffer is flushed prior to the newline
                    309:  * assertion.
                    310:  */
                    311: void
                    312: term_vspace(struct termp *p)
1.16      kristaps  313: {
                    314:
1.62      kristaps  315:        term_newln(p);
1.71      kristaps  316:        putchar('\n');
1.16      kristaps  317: }
                    318:
                    319:
1.71      kristaps  320: static void
1.125     kristaps  321: spec(struct termp *p, const char *word, size_t len)
1.17      kristaps  322: {
1.71      kristaps  323:        const char      *rhs;
                    324:        size_t           sz;
1.17      kristaps  325:
1.101     kristaps  326:        rhs = chars_a2ascii(p->symtab, word, len, &sz);
1.125     kristaps  327:        if (rhs)
                    328:                encode(p, rhs, sz);
1.94      kristaps  329: }
                    330:
                    331:
                    332: static void
1.125     kristaps  333: res(struct termp *p, const char *word, size_t len)
1.94      kristaps  334: {
                    335:        const char      *rhs;
                    336:        size_t           sz;
                    337:
1.101     kristaps  338:        rhs = chars_a2res(p->symtab, word, len, &sz);
1.125     kristaps  339:        if (rhs)
                    340:                encode(p, rhs, sz);
                    341: }
                    342:
                    343:
                    344: void
                    345: term_fontlast(struct termp *p)
                    346: {
                    347:        enum termfont    f;
                    348:
                    349:        f = p->fontl;
                    350:        p->fontl = p->fontq[p->fonti];
                    351:        p->fontq[p->fonti] = f;
                    352: }
                    353:
                    354:
                    355: void
                    356: term_fontrepl(struct termp *p, enum termfont f)
                    357: {
                    358:
                    359:        p->fontl = p->fontq[p->fonti];
                    360:        p->fontq[p->fonti] = f;
                    361: }
                    362:
                    363:
                    364: void
                    365: term_fontpush(struct termp *p, enum termfont f)
                    366: {
                    367:
                    368:        assert(p->fonti + 1 < 10);
                    369:        p->fontl = p->fontq[p->fonti];
                    370:        p->fontq[++p->fonti] = f;
                    371: }
                    372:
                    373:
                    374: const void *
                    375: term_fontq(struct termp *p)
                    376: {
                    377:
                    378:        return(&p->fontq[p->fonti]);
                    379: }
                    380:
                    381:
                    382: enum termfont
                    383: term_fonttop(struct termp *p)
                    384: {
                    385:
                    386:        return(p->fontq[p->fonti]);
                    387: }
                    388:
                    389:
                    390: void
                    391: term_fontpopq(struct termp *p, const void *key)
                    392: {
                    393:
                    394:        while (p->fonti >= 0 && key != &p->fontq[p->fonti])
                    395:                p->fonti--;
                    396:        assert(p->fonti >= 0);
                    397: }
1.94      kristaps  398:
1.125     kristaps  399:
                    400: void
                    401: term_fontpop(struct termp *p)
                    402: {
                    403:
                    404:        assert(p->fonti);
                    405:        p->fonti--;
1.17      kristaps  406: }
                    407:
                    408:
1.71      kristaps  409: /*
                    410:  * Handle pwords, partial words, which may be either a single word or a
                    411:  * phrase that cannot be broken down (such as a literal string).  This
                    412:  * handles word styling.
                    413:  */
1.86      kristaps  414: void
                    415: term_word(struct termp *p, const char *word)
1.65      kristaps  416: {
1.124     kristaps  417:        const char      *sv, *seq;
1.125     kristaps  418:        int              sz;
1.124     kristaps  419:        size_t           ssz;
                    420:        enum roffdeco    deco;
1.71      kristaps  421:
1.100     kristaps  422:        sv = word;
                    423:
1.123     kristaps  424:        if (word[0] && '\0' == word[1])
1.100     kristaps  425:                switch (word[0]) {
                    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:                        /* FALLTHROUGH */
                    442:                case('}'):
                    443:                        if ( ! (TERMP_IGNDELIM & p->flags))
                    444:                                p->flags |= TERMP_NOSPACE;
                    445:                        break;
                    446:                default:
                    447:                        break;
                    448:                }
1.65      kristaps  449:
1.71      kristaps  450:        if ( ! (TERMP_NOSPACE & p->flags))
1.125     kristaps  451:                bufferc(p, ' ');
1.65      kristaps  452:
1.71      kristaps  453:        if ( ! (p->flags & TERMP_NONOSPACE))
                    454:                p->flags &= ~TERMP_NOSPACE;
1.65      kristaps  455:
1.125     kristaps  456:        /* FIXME: use strcspn. */
1.124     kristaps  457:
                    458:        while (*word) {
                    459:                if ('\\' != *word) {
1.125     kristaps  460:                        encode(p, word, 1);
1.124     kristaps  461:                        word++;
                    462:                        continue;
                    463:                }
                    464:
                    465:                seq = ++word;
                    466:                sz = a2roffdeco(&deco, &seq, &ssz);
                    467:
                    468:                switch (deco) {
                    469:                case (DECO_RESERVED):
1.125     kristaps  470:                        res(p, seq, ssz);
1.124     kristaps  471:                        break;
                    472:                case (DECO_SPECIAL):
1.125     kristaps  473:                        spec(p, seq, ssz);
1.124     kristaps  474:                        break;
                    475:                case (DECO_BOLD):
1.125     kristaps  476:                        term_fontrepl(p, TERMFONT_BOLD);
1.124     kristaps  477:                        break;
                    478:                case (DECO_ITALIC):
1.125     kristaps  479:                        term_fontrepl(p, TERMFONT_UNDER);
1.124     kristaps  480:                        break;
                    481:                case (DECO_ROMAN):
1.125     kristaps  482:                        term_fontrepl(p, TERMFONT_NONE);
1.124     kristaps  483:                        break;
                    484:                case (DECO_PREVIOUS):
1.125     kristaps  485:                        term_fontlast(p);
1.124     kristaps  486:                        break;
                    487:                default:
                    488:                        break;
                    489:                }
1.127   ! kristaps  490:
1.124     kristaps  491:                word += sz;
1.127   ! kristaps  492:                if (DECO_NOSPACE == deco && '\0' == *word)
        !           493:                        p->flags |= TERMP_NOSPACE;
1.124     kristaps  494:        }
1.65      kristaps  495:
1.100     kristaps  496:        if (sv[0] && 0 == sv[1])
                    497:                switch (sv[0]) {
                    498:                case('('):
                    499:                        /* FALLTHROUGH */
                    500:                case('['):
                    501:                        /* FALLTHROUGH */
                    502:                case('{'):
                    503:                        p->flags |= TERMP_NOSPACE;
                    504:                        break;
                    505:                default:
                    506:                        break;
                    507:                }
1.65      kristaps  508: }
                    509:
                    510:
1.71      kristaps  511: static void
1.125     kristaps  512: adjbuf(struct termp *p, size_t sz)
1.51      kristaps  513: {
                    514:
1.125     kristaps  515:        if (0 == p->maxcols)
                    516:                p->maxcols = 1024;
                    517:        while (sz >= p->maxcols)
                    518:                p->maxcols <<= 2;
                    519:
                    520:        p->buf = realloc(p->buf, p->maxcols);
                    521:        if (NULL == p->buf) {
                    522:                perror(NULL);
                    523:                exit(EXIT_FAILURE);
1.71      kristaps  524:        }
1.51      kristaps  525: }
                    526:
1.79      kristaps  527:
                    528: static void
1.125     kristaps  529: buffera(struct termp *p, const char *word, size_t sz)
1.79      kristaps  530: {
1.125     kristaps  531:
                    532:        if (p->col + sz >= p->maxcols)
                    533:                adjbuf(p, p->col + sz);
                    534:
1.126     kristaps  535:        memcpy(&p->buf[(int)p->col], word, sz);
1.125     kristaps  536:        p->col += sz;
                    537: }
                    538:
                    539:
                    540: static void
                    541: bufferc(struct termp *p, char c)
                    542: {
                    543:
                    544:        if (p->col + 1 >= p->maxcols)
                    545:                adjbuf(p, p->col + 1);
                    546:
1.126     kristaps  547:        p->buf[(int)p->col++] = c;
1.125     kristaps  548: }
                    549:
                    550:
                    551: static void
                    552: encode(struct termp *p, const char *word, size_t sz)
                    553: {
                    554:        enum termfont     f;
                    555:        int               i;
                    556:
                    557:        /*
                    558:         * Encode and buffer a string of characters.  If the current
                    559:         * font mode is unset, buffer directly, else encode then buffer
                    560:         * character by character.
                    561:         */
                    562:
                    563:        if (TERMFONT_NONE == (f = term_fonttop(p))) {
                    564:                buffera(p, word, sz);
                    565:                return;
                    566:        }
                    567:
                    568:        for (i = 0; i < (int)sz; i++) {
                    569:                if ( ! isgraph((u_char)word[i])) {
                    570:                        bufferc(p, word[i]);
                    571:                        continue;
1.79      kristaps  572:                }
1.125     kristaps  573:
                    574:                if (TERMFONT_UNDER == f)
                    575:                        bufferc(p, '_');
                    576:                else
                    577:                        bufferc(p, word[i]);
                    578:
                    579:                bufferc(p, 8);
                    580:                bufferc(p, word[i]);
1.79      kristaps  581:        }
                    582: }
1.106     kristaps  583:
                    584:
1.107     kristaps  585: size_t
                    586: term_vspan(const struct roffsu *su)
1.106     kristaps  587: {
                    588:        double           r;
                    589:
1.107     kristaps  590:        switch (su->unit) {
1.106     kristaps  591:        case (SCALE_CM):
1.107     kristaps  592:                r = su->scale * 2;
1.106     kristaps  593:                break;
                    594:        case (SCALE_IN):
1.107     kristaps  595:                r = su->scale * 6;
1.106     kristaps  596:                break;
                    597:        case (SCALE_PC):
1.107     kristaps  598:                r = su->scale;
1.106     kristaps  599:                break;
                    600:        case (SCALE_PT):
1.107     kristaps  601:                r = su->scale / 8;
1.106     kristaps  602:                break;
                    603:        case (SCALE_MM):
1.107     kristaps  604:                r = su->scale / 1000;
1.106     kristaps  605:                break;
                    606:        case (SCALE_VS):
1.107     kristaps  607:                r = su->scale;
1.106     kristaps  608:                break;
                    609:        default:
1.107     kristaps  610:                r = su->scale - 1;
1.106     kristaps  611:                break;
                    612:        }
                    613:
                    614:        if (r < 0.0)
                    615:                r = 0.0;
1.107     kristaps  616:        return(/* LINTED */(size_t)
1.106     kristaps  617:                        r);
                    618: }
                    619:
                    620:
1.107     kristaps  621: size_t
                    622: term_hspan(const struct roffsu *su)
1.106     kristaps  623: {
                    624:        double           r;
                    625:
1.108     kristaps  626:        /* XXX: CM, IN, and PT are approximations. */
                    627:
1.107     kristaps  628:        switch (su->unit) {
1.106     kristaps  629:        case (SCALE_CM):
1.108     kristaps  630:                r = 4 * su->scale;
1.106     kristaps  631:                break;
                    632:        case (SCALE_IN):
1.108     kristaps  633:                /* XXX: this is an approximation. */
                    634:                r = 10 * su->scale;
1.106     kristaps  635:                break;
                    636:        case (SCALE_PC):
1.108     kristaps  637:                r = (10 * su->scale) / 6;
1.106     kristaps  638:                break;
                    639:        case (SCALE_PT):
1.108     kristaps  640:                r = (10 * su->scale) / 72;
1.106     kristaps  641:                break;
                    642:        case (SCALE_MM):
1.107     kristaps  643:                r = su->scale / 1000; /* FIXME: double-check. */
1.106     kristaps  644:                break;
                    645:        case (SCALE_VS):
1.107     kristaps  646:                r = su->scale * 2 - 1; /* FIXME: double-check. */
1.106     kristaps  647:                break;
                    648:        default:
1.107     kristaps  649:                r = su->scale;
1.106     kristaps  650:                break;
                    651:        }
                    652:
                    653:        if (r < 0.0)
                    654:                r = 0.0;
1.107     kristaps  655:        return((size_t)/* LINTED */
1.106     kristaps  656:                        r);
                    657: }
                    658:
                    659:

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