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Annotation of mandoc/term.c, Revision 1.110

1.110   ! kristaps    1: /*     $Id: term.c,v 1.109 2009/10/22 18:19:36 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>
1.23      kristaps   18: #include <err.h>
1.22      kristaps   19: #include <stdio.h>
1.1       kristaps   20: #include <stdlib.h>
                     21: #include <string.h>
                     22:
1.101     kristaps   23: #include "chars.h"
1.107     kristaps   24: #include "out.h"
1.71      kristaps   25: #include "term.h"
                     26: #include "man.h"
                     27: #include "mdoc.h"
1.105     kristaps   28: #include "main.h"
1.1       kristaps   29:
1.103     kristaps   30: /* FIXME: accomodate non-breaking, non-collapsing white-space. */
                     31: /* FIXME: accomodate non-breaking, collapsing white-space. */
                     32:
1.71      kristaps   33: static struct termp     *term_alloc(enum termenc);
                     34: static void              term_free(struct termp *);
1.95      kristaps   35:
                     36: static void              do_escaped(struct termp *, const char **);
                     37: static void              do_special(struct termp *,
1.71      kristaps   38:                                const char *, size_t);
1.95      kristaps   39: static void              do_reserved(struct termp *,
1.94      kristaps   40:                                const char *, size_t);
1.95      kristaps   41: static void              buffer(struct termp *, char);
                     42: static void              encode(struct termp *, char);
1.1       kristaps   43:
                     44:
1.71      kristaps   45: void *
                     46: ascii_alloc(void)
1.10      kristaps   47: {
1.1       kristaps   48:
1.71      kristaps   49:        return(term_alloc(TERMENC_ASCII));
1.1       kristaps   50: }
                     51:
                     52:
1.99      kristaps   53: void
1.71      kristaps   54: terminal_free(void *arg)
1.11      kristaps   55: {
                     56:
1.71      kristaps   57:        term_free((struct termp *)arg);
1.11      kristaps   58: }
                     59:
                     60:
1.71      kristaps   61: static void
                     62: term_free(struct termp *p)
1.14      kristaps   63: {
                     64:
1.71      kristaps   65:        if (p->buf)
                     66:                free(p->buf);
1.102     kristaps   67:        if (p->symtab)
1.101     kristaps   68:                chars_free(p->symtab);
1.14      kristaps   69:
1.71      kristaps   70:        free(p);
1.14      kristaps   71: }
                     72:
                     73:
1.71      kristaps   74: static struct termp *
                     75: term_alloc(enum termenc enc)
1.14      kristaps   76: {
1.71      kristaps   77:        struct termp *p;
1.14      kristaps   78:
1.71      kristaps   79:        if (NULL == (p = malloc(sizeof(struct termp))))
1.98      kristaps   80:                return(NULL);
1.71      kristaps   81:        bzero(p, sizeof(struct termp));
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
                    122:  *  writing from the right-margin, which will lead to the above
                    123:  *  scenario upon exit.
                    124:  *
                    125:  *  Otherwise, the line will break at the right margin.  Extremely long
                    126:  *  lines will cause the system to emit a warning (TODO: hyphenate, if
                    127:  *  possible).
                    128:  */
                    129: void
                    130: term_flushln(struct termp *p)
1.53      kristaps  131: {
1.71      kristaps  132:        int              i, j;
1.110   ! kristaps  133:        size_t           vbl, vsz, vis, maxvis, mmax, bp;
1.91      kristaps  134:        static int       overstep = 0;
1.53      kristaps  135:
1.71      kristaps  136:        /*
                    137:         * First, establish the maximum columns of "visible" content.
                    138:         * This is usually the difference between the right-margin and
                    139:         * an indentation, but can be, for tagged lists or columns, a
                    140:         * small set of values.
                    141:         */
1.53      kristaps  142:
1.71      kristaps  143:        assert(p->offset < p->rmargin);
1.92      kristaps  144:        assert((int)(p->rmargin - p->offset) - overstep > 0);
                    145:
                    146:        maxvis = /* LINTED */
                    147:                p->rmargin - p->offset - overstep;
                    148:        mmax = /* LINTED */
                    149:                p->maxrmargin - p->offset - overstep;
                    150:
1.71      kristaps  151:        bp = TERMP_NOBREAK & p->flags ? mmax : maxvis;
                    152:        vis = 0;
1.84      kristaps  153:
1.71      kristaps  154:        /*
                    155:         * If in the standard case (left-justified), then begin with our
                    156:         * indentation, otherwise (columns, etc.) just start spitting
                    157:         * out text.
                    158:         */
1.53      kristaps  159:
1.71      kristaps  160:        if ( ! (p->flags & TERMP_NOLPAD))
                    161:                /* LINTED */
                    162:                for (j = 0; j < (int)p->offset; j++)
                    163:                        putchar(' ');
                    164:
                    165:        for (i = 0; i < (int)p->col; i++) {
                    166:                /*
                    167:                 * Count up visible word characters.  Control sequences
                    168:                 * (starting with the CSI) aren't counted.  A space
                    169:                 * generates a non-printing word, which is valid (the
                    170:                 * space is printed according to regular spacing rules).
                    171:                 */
                    172:
                    173:                /* LINTED */
                    174:                for (j = i, vsz = 0; j < (int)p->col; j++) {
1.93      kristaps  175:                        if (j && ' ' == p->buf[j])
1.71      kristaps  176:                                break;
                    177:                        else if (8 == p->buf[j])
1.89      kristaps  178:                                vsz--;
1.71      kristaps  179:                        else
                    180:                                vsz++;
                    181:                }
1.53      kristaps  182:
1.71      kristaps  183:                /*
1.81      kristaps  184:                 * Choose the number of blanks to prepend: no blank at the
                    185:                 * beginning of a line, one between words -- but do not
                    186:                 * actually write them yet.
1.71      kristaps  187:                 */
1.81      kristaps  188:                vbl = (size_t)(0 == vis ? 0 : 1);
1.71      kristaps  189:
1.81      kristaps  190:                /*
                    191:                 * Find out whether we would exceed the right margin.
                    192:                 * If so, break to the next line.  (TODO: hyphenate)
                    193:                 * Otherwise, write the chosen number of blanks now.
                    194:                 */
                    195:                if (vis && vis + vbl + vsz > bp) {
                    196:                        putchar('\n');
                    197:                        if (TERMP_NOBREAK & p->flags) {
                    198:                                for (j = 0; j < (int)p->rmargin; j++)
                    199:                                        putchar(' ');
                    200:                                vis = p->rmargin - p->offset;
                    201:                        } else {
1.71      kristaps  202:                                for (j = 0; j < (int)p->offset; j++)
                    203:                                        putchar(' ');
                    204:                                vis = 0;
1.81      kristaps  205:                        }
1.104     kristaps  206:                        /* Remove the overstep width. */
1.110   ! kristaps  207:                        bp += overstep;
        !           208:                        overstep = 0;
1.81      kristaps  209:                } else {
                    210:                        for (j = 0; j < (int)vbl; j++)
1.71      kristaps  211:                                putchar(' ');
1.81      kristaps  212:                        vis += vbl;
1.71      kristaps  213:                }
1.53      kristaps  214:
1.78      kristaps  215:                /*
1.81      kristaps  216:                 * Finally, write out the word.
1.71      kristaps  217:                 */
                    218:                for ( ; i < (int)p->col; i++) {
                    219:                        if (' ' == p->buf[i])
                    220:                                break;
                    221:                        putchar(p->buf[i]);
                    222:                }
                    223:                vis += vsz;
                    224:        }
1.91      kristaps  225:        p->col = 0;
1.15      kristaps  226:
1.91      kristaps  227:        if ( ! (TERMP_NOBREAK & p->flags)) {
                    228:                putchar('\n');
1.15      kristaps  229:                return;
1.71      kristaps  230:        }
1.15      kristaps  231:
1.110   ! kristaps  232:        overstep = 0;
1.91      kristaps  233:        if (TERMP_HANG & p->flags) {
                    234:                /* We need one blank after the tag. */
1.92      kristaps  235:                overstep = /* LINTED */
                    236:                        vis - maxvis + 1;
1.91      kristaps  237:
                    238:                /*
                    239:                 * Behave exactly the same way as groff:
1.92      kristaps  240:                 * If we have overstepped the margin, temporarily move
                    241:                 * it to the right and flag the rest of the line to be
                    242:                 * shorter.
1.91      kristaps  243:                 * If we landed right at the margin, be happy.
1.92      kristaps  244:                 * If we are one step before the margin, temporarily
                    245:                 * move it one step LEFT and flag the rest of the line
                    246:                 * to be longer.
1.91      kristaps  247:                 */
1.92      kristaps  248:                if (overstep >= -1) {
                    249:                        assert((int)maxvis + overstep >= 0);
                    250:                        /* LINTED */
1.91      kristaps  251:                        maxvis += overstep;
1.92      kristaps  252:                } else
1.91      kristaps  253:                        overstep = 0;
                    254:
                    255:        } else if (TERMP_DANGLE & p->flags)
                    256:                return;
1.15      kristaps  257:
1.92      kristaps  258:        /* Right-pad. */
                    259:        if (maxvis > vis + /* LINTED */
                    260:                        ((TERMP_TWOSPACE & p->flags) ? 1 : 0))
1.91      kristaps  261:                for ( ; vis < maxvis; vis++)
                    262:                        putchar(' ');
1.92      kristaps  263:        else {  /* ...or newline break. */
1.71      kristaps  264:                putchar('\n');
1.91      kristaps  265:                for (i = 0; i < (int)p->rmargin; i++)
                    266:                        putchar(' ');
                    267:        }
1.15      kristaps  268: }
                    269:
                    270:
1.71      kristaps  271: /*
                    272:  * A newline only breaks an existing line; it won't assert vertical
                    273:  * space.  All data in the output buffer is flushed prior to the newline
                    274:  * assertion.
                    275:  */
                    276: void
                    277: term_newln(struct termp *p)
1.15      kristaps  278: {
                    279:
1.71      kristaps  280:        p->flags |= TERMP_NOSPACE;
                    281:        if (0 == p->col) {
                    282:                p->flags &= ~TERMP_NOLPAD;
1.15      kristaps  283:                return;
1.16      kristaps  284:        }
1.71      kristaps  285:        term_flushln(p);
                    286:        p->flags &= ~TERMP_NOLPAD;
1.16      kristaps  287: }
                    288:
                    289:
1.71      kristaps  290: /*
                    291:  * Asserts a vertical space (a full, empty line-break between lines).
                    292:  * Note that if used twice, this will cause two blank spaces and so on.
                    293:  * All data in the output buffer is flushed prior to the newline
                    294:  * assertion.
                    295:  */
                    296: void
                    297: term_vspace(struct termp *p)
1.16      kristaps  298: {
                    299:
1.62      kristaps  300:        term_newln(p);
1.71      kristaps  301:        putchar('\n');
1.16      kristaps  302: }
                    303:
                    304:
1.71      kristaps  305: static void
1.95      kristaps  306: do_special(struct termp *p, const char *word, size_t len)
1.17      kristaps  307: {
1.71      kristaps  308:        const char      *rhs;
                    309:        size_t           sz;
1.79      kristaps  310:        int              i;
1.17      kristaps  311:
1.101     kristaps  312:        rhs = chars_a2ascii(p->symtab, word, len, &sz);
1.86      kristaps  313:
1.96      kristaps  314:        if (NULL == rhs) {
1.97      kristaps  315: #if 0
1.96      kristaps  316:                fputs("Unknown special character: ", stderr);
                    317:                for (i = 0; i < (int)len; i++)
                    318:                        fputc(word[i], stderr);
                    319:                fputc('\n', stderr);
                    320: #endif
1.94      kristaps  321:                return;
1.96      kristaps  322:        }
1.94      kristaps  323:        for (i = 0; i < (int)sz; i++)
1.95      kristaps  324:                encode(p, rhs[i]);
1.94      kristaps  325: }
                    326:
                    327:
                    328: static void
1.95      kristaps  329: do_reserved(struct termp *p, const char *word, size_t len)
1.94      kristaps  330: {
                    331:        const char      *rhs;
                    332:        size_t           sz;
                    333:        int              i;
                    334:
1.101     kristaps  335:        rhs = chars_a2res(p->symtab, word, len, &sz);
1.94      kristaps  336:
1.96      kristaps  337:        if (NULL == rhs) {
                    338: #if 0
                    339:                fputs("Unknown reserved word: ", stderr);
                    340:                for (i = 0; i < (int)len; i++)
                    341:                        fputc(word[i], stderr);
                    342:                fputc('\n', stderr);
                    343: #endif
1.94      kristaps  344:                return;
1.96      kristaps  345:        }
1.94      kristaps  346:        for (i = 0; i < (int)sz; i++)
1.95      kristaps  347:                encode(p, rhs[i]);
1.17      kristaps  348: }
                    349:
                    350:
1.71      kristaps  351: /*
                    352:  * Handle an escape sequence: determine its length and pass it to the
                    353:  * escape-symbol look table.  Note that we assume mdoc(3) has validated
                    354:  * the escape sequence (we assert upon badly-formed escape sequences).
                    355:  */
                    356: static void
1.95      kristaps  357: do_escaped(struct termp *p, const char **word)
1.17      kristaps  358: {
1.97      kristaps  359:        int              j, type;
1.86      kristaps  360:        const char      *wp;
                    361:
                    362:        wp = *word;
1.97      kristaps  363:        type = 1;
1.17      kristaps  364:
1.86      kristaps  365:        if (0 == *(++wp)) {
                    366:                *word = wp;
1.71      kristaps  367:                return;
1.86      kristaps  368:        }
1.17      kristaps  369:
1.86      kristaps  370:        if ('(' == *wp) {
                    371:                wp++;
                    372:                if (0 == *wp || 0 == *(wp + 1)) {
                    373:                        *word = 0 == *wp ? wp : wp + 1;
1.71      kristaps  374:                        return;
1.86      kristaps  375:                }
1.22      kristaps  376:
1.95      kristaps  377:                do_special(p, wp, 2);
1.86      kristaps  378:                *word = ++wp;
1.71      kristaps  379:                return;
1.22      kristaps  380:
1.86      kristaps  381:        } else if ('*' == *wp) {
                    382:                if (0 == *(++wp)) {
                    383:                        *word = wp;
1.71      kristaps  384:                        return;
1.86      kristaps  385:                }
1.22      kristaps  386:
1.86      kristaps  387:                switch (*wp) {
1.71      kristaps  388:                case ('('):
1.86      kristaps  389:                        wp++;
                    390:                        if (0 == *wp || 0 == *(wp + 1)) {
                    391:                                *word = 0 == *wp ? wp : wp + 1;
1.71      kristaps  392:                                return;
1.86      kristaps  393:                        }
1.65      kristaps  394:
1.95      kristaps  395:                        do_reserved(p, wp, 2);
1.86      kristaps  396:                        *word = ++wp;
1.71      kristaps  397:                        return;
                    398:                case ('['):
1.97      kristaps  399:                        type = 0;
1.71      kristaps  400:                        break;
                    401:                default:
1.95      kristaps  402:                        do_reserved(p, wp, 1);
1.86      kristaps  403:                        *word = wp;
1.71      kristaps  404:                        return;
                    405:                }
                    406:
1.86      kristaps  407:        } else if ('f' == *wp) {
                    408:                if (0 == *(++wp)) {
                    409:                        *word = wp;
1.71      kristaps  410:                        return;
1.86      kristaps  411:                }
                    412:
                    413:                switch (*wp) {
1.71      kristaps  414:                case ('B'):
1.98      kristaps  415:                        p->bold++;
1.71      kristaps  416:                        break;
                    417:                case ('I'):
1.98      kristaps  418:                        p->under++;
1.71      kristaps  419:                        break;
                    420:                case ('P'):
                    421:                        /* FALLTHROUGH */
                    422:                case ('R'):
1.98      kristaps  423:                        p->bold = p->under = 0;
1.71      kristaps  424:                        break;
                    425:                default:
                    426:                        break;
                    427:                }
1.86      kristaps  428:
                    429:                *word = wp;
1.71      kristaps  430:                return;
1.22      kristaps  431:
1.86      kristaps  432:        } else if ('[' != *wp) {
1.95      kristaps  433:                do_special(p, wp, 1);
1.86      kristaps  434:                *word = wp;
1.71      kristaps  435:                return;
                    436:        }
1.28      kristaps  437:
1.86      kristaps  438:        wp++;
                    439:        for (j = 0; *wp && ']' != *wp; wp++, j++)
1.71      kristaps  440:                /* Loop... */ ;
1.28      kristaps  441:
1.86      kristaps  442:        if (0 == *wp) {
                    443:                *word = wp;
1.71      kristaps  444:                return;
1.86      kristaps  445:        }
1.48      kristaps  446:
1.97      kristaps  447:        if (type)
                    448:                do_special(p, wp - j, (size_t)j);
                    449:        else
                    450:                do_reserved(p, wp - j, (size_t)j);
1.86      kristaps  451:        *word = wp;
1.48      kristaps  452: }
                    453:
                    454:
1.71      kristaps  455: /*
                    456:  * Handle pwords, partial words, which may be either a single word or a
                    457:  * phrase that cannot be broken down (such as a literal string).  This
                    458:  * handles word styling.
                    459:  */
1.86      kristaps  460: void
                    461: term_word(struct termp *p, const char *word)
1.65      kristaps  462: {
1.88      kristaps  463:        const char       *sv;
1.71      kristaps  464:
1.100     kristaps  465:        sv = word;
                    466:
                    467:        if (word[0] && 0 == word[1])
                    468:                switch (word[0]) {
                    469:                case('.'):
                    470:                        /* FALLTHROUGH */
                    471:                case(','):
                    472:                        /* FALLTHROUGH */
                    473:                case(';'):
                    474:                        /* FALLTHROUGH */
                    475:                case(':'):
                    476:                        /* FALLTHROUGH */
                    477:                case('?'):
                    478:                        /* FALLTHROUGH */
                    479:                case('!'):
                    480:                        /* FALLTHROUGH */
                    481:                case(')'):
                    482:                        /* FALLTHROUGH */
                    483:                case(']'):
                    484:                        /* FALLTHROUGH */
                    485:                case('}'):
                    486:                        if ( ! (TERMP_IGNDELIM & p->flags))
                    487:                                p->flags |= TERMP_NOSPACE;
                    488:                        break;
                    489:                default:
                    490:                        break;
                    491:                }
1.65      kristaps  492:
1.71      kristaps  493:        if ( ! (TERMP_NOSPACE & p->flags))
1.95      kristaps  494:                buffer(p, ' ');
1.65      kristaps  495:
1.71      kristaps  496:        if ( ! (p->flags & TERMP_NONOSPACE))
                    497:                p->flags &= ~TERMP_NOSPACE;
1.65      kristaps  498:
1.100     kristaps  499:        for ( ; *word; word++)
1.86      kristaps  500:                if ('\\' != *word)
1.95      kristaps  501:                        encode(p, *word);
1.79      kristaps  502:                else
1.95      kristaps  503:                        do_escaped(p, &word);
1.65      kristaps  504:
1.100     kristaps  505:        if (sv[0] && 0 == sv[1])
                    506:                switch (sv[0]) {
                    507:                case('('):
                    508:                        /* FALLTHROUGH */
                    509:                case('['):
                    510:                        /* FALLTHROUGH */
                    511:                case('{'):
                    512:                        p->flags |= TERMP_NOSPACE;
                    513:                        break;
                    514:                default:
                    515:                        break;
                    516:                }
1.65      kristaps  517: }
                    518:
                    519:
1.71      kristaps  520: /*
                    521:  * Insert a single character into the line-buffer.  If the buffer's
                    522:  * space is exceeded, then allocate more space by doubling the buffer
                    523:  * size.
                    524:  */
                    525: static void
1.95      kristaps  526: buffer(struct termp *p, char c)
1.51      kristaps  527: {
1.71      kristaps  528:        size_t           s;
1.51      kristaps  529:
1.71      kristaps  530:        if (p->col + 1 >= p->maxcols) {
                    531:                if (0 == p->maxcols)
                    532:                        p->maxcols = 256;
                    533:                s = p->maxcols * 2;
                    534:                p->buf = realloc(p->buf, s);
                    535:                if (NULL == p->buf)
1.98      kristaps  536:                        err(1, "realloc"); /* FIXME: shouldn't be here! */
1.71      kristaps  537:                p->maxcols = s;
                    538:        }
                    539:        p->buf[(int)(p->col)++] = c;
1.51      kristaps  540: }
                    541:
1.79      kristaps  542:
                    543: static void
1.95      kristaps  544: encode(struct termp *p, char c)
1.79      kristaps  545: {
1.89      kristaps  546:
1.98      kristaps  547:        if (' ' != c) {
1.109     kristaps  548:                if (p->under) {
                    549:                        buffer(p, '_');
                    550:                        buffer(p, 8);
                    551:                }
1.98      kristaps  552:                if (p->bold) {
1.95      kristaps  553:                        buffer(p, c);
                    554:                        buffer(p, 8);
1.79      kristaps  555:                }
                    556:        }
1.95      kristaps  557:        buffer(p, c);
1.79      kristaps  558: }
1.106     kristaps  559:
                    560:
1.107     kristaps  561: size_t
                    562: term_vspan(const struct roffsu *su)
1.106     kristaps  563: {
                    564:        double           r;
                    565:
1.107     kristaps  566:        switch (su->unit) {
1.106     kristaps  567:        case (SCALE_CM):
1.107     kristaps  568:                r = su->scale * 2;
1.106     kristaps  569:                break;
                    570:        case (SCALE_IN):
1.107     kristaps  571:                r = su->scale * 6;
1.106     kristaps  572:                break;
                    573:        case (SCALE_PC):
1.107     kristaps  574:                r = su->scale;
1.106     kristaps  575:                break;
                    576:        case (SCALE_PT):
1.107     kristaps  577:                r = su->scale / 8;
1.106     kristaps  578:                break;
                    579:        case (SCALE_MM):
1.107     kristaps  580:                r = su->scale / 1000;
1.106     kristaps  581:                break;
                    582:        case (SCALE_VS):
1.107     kristaps  583:                r = su->scale;
1.106     kristaps  584:                break;
                    585:        default:
1.107     kristaps  586:                r = su->scale - 1;
1.106     kristaps  587:                break;
                    588:        }
                    589:
                    590:        if (r < 0.0)
                    591:                r = 0.0;
1.107     kristaps  592:        return(/* LINTED */(size_t)
1.106     kristaps  593:                        r);
                    594: }
                    595:
                    596:
1.107     kristaps  597: size_t
                    598: term_hspan(const struct roffsu *su)
1.106     kristaps  599: {
                    600:        double           r;
                    601:
1.108     kristaps  602:        /* XXX: CM, IN, and PT are approximations. */
                    603:
1.107     kristaps  604:        switch (su->unit) {
1.106     kristaps  605:        case (SCALE_CM):
1.108     kristaps  606:                r = 4 * su->scale;
1.106     kristaps  607:                break;
                    608:        case (SCALE_IN):
1.108     kristaps  609:                /* XXX: this is an approximation. */
                    610:                r = 10 * su->scale;
1.106     kristaps  611:                break;
                    612:        case (SCALE_PC):
1.108     kristaps  613:                r = (10 * su->scale) / 6;
1.106     kristaps  614:                break;
                    615:        case (SCALE_PT):
1.108     kristaps  616:                r = (10 * su->scale) / 72;
1.106     kristaps  617:                break;
                    618:        case (SCALE_MM):
1.107     kristaps  619:                r = su->scale / 1000; /* FIXME: double-check. */
1.106     kristaps  620:                break;
                    621:        case (SCALE_VS):
1.107     kristaps  622:                r = su->scale * 2 - 1; /* FIXME: double-check. */
1.106     kristaps  623:                break;
                    624:        default:
1.107     kristaps  625:                r = su->scale;
1.106     kristaps  626:                break;
                    627:        }
                    628:
                    629:        if (r < 0.0)
                    630:                r = 0.0;
1.107     kristaps  631:        return((size_t)/* LINTED */
1.106     kristaps  632:                        r);
                    633: }
                    634:
                    635:

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