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Annotation of mandoc/term.c, Revision 1.118

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

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