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Annotation of mandoc/term.c, Revision 1.120

1.120   ! kristaps    1: /*     $Id: term.c,v 1.119 2009/10/30 18:53:09 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>
1.22      kristaps   18: #include <stdio.h>
1.1       kristaps   19: #include <stdlib.h>
                     20: #include <string.h>
1.113     kristaps   21: #include <time.h>
1.1       kristaps   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:
1.117     kristaps   79:        p = calloc(1, sizeof(struct termp));
                     80:        if (NULL == p) {
1.120   ! kristaps   81:                perror(NULL);
1.117     kristaps   82:                exit(EXIT_FAILURE);
                     83:        }
1.80      kristaps   84:        p->maxrmargin = 78;
1.71      kristaps   85:        p->enc = enc;
                     86:        return(p);
1.14      kristaps   87: }
                     88:
                     89:
1.71      kristaps   90: /*
                     91:  * Flush a line of text.  A "line" is loosely defined as being something
                     92:  * that should be followed by a newline, regardless of whether it's
                     93:  * broken apart by newlines getting there.  A line can also be a
                     94:  * fragment of a columnar list.
                     95:  *
                     96:  * Specifically, a line is whatever's in p->buf of length p->col, which
                     97:  * is zeroed after this function returns.
                     98:  *
1.84      kristaps   99:  * The usage of termp:flags is as follows:
1.71      kristaps  100:  *
                    101:  *  - TERMP_NOLPAD: when beginning to write the line, don't left-pad the
                    102:  *    offset value.  This is useful when doing columnar lists where the
                    103:  *    prior column has right-padded.
                    104:  *
                    105:  *  - TERMP_NOBREAK: this is the most important and is used when making
                    106:  *    columns.  In short: don't print a newline and instead pad to the
                    107:  *    right margin.  Used in conjunction with TERMP_NOLPAD.
                    108:  *
1.91      kristaps  109:  *  - TERMP_TWOSPACE: when padding, make sure there are at least two
                    110:  *    space characters of padding.  Otherwise, rather break the line.
                    111:  *
1.84      kristaps  112:  *  - TERMP_DANGLE: don't newline when TERMP_NOBREAK is specified and
                    113:  *    the line is overrun, and don't pad-right if it's underrun.
                    114:  *
                    115:  *  - TERMP_HANG: like TERMP_DANGLE, but doesn't newline when
                    116:  *    overruning, instead save the position and continue at that point
                    117:  *    when the next invocation.
1.71      kristaps  118:  *
                    119:  *  In-line line breaking:
                    120:  *
                    121:  *  If TERMP_NOBREAK is specified and the line overruns the right
                    122:  *  margin, it will break and pad-right to the right margin after
                    123:  *  writing.  If maxrmargin is violated, it will break and continue
1.114     kristaps  124:  *  writing from the right-margin, which will lead to the above scenario
                    125:  *  upon exit.  Otherwise, the line will break at the right margin.
1.71      kristaps  126:  */
                    127: void
                    128: term_flushln(struct termp *p)
1.53      kristaps  129: {
1.114     kristaps  130:        int              i;     /* current input position in p->buf */
                    131:        size_t           vis;   /* current visual position on output */
                    132:        size_t           vbl;   /* number of blanks to prepend to output */
                    133:        size_t           vsz;   /* visual characters to write to output */
                    134:        size_t           bp;    /* visual right border position */
                    135:        int              j;     /* temporary loop index */
                    136:        size_t           maxvis, mmax;
1.91      kristaps  137:        static int       overstep = 0;
1.53      kristaps  138:
1.71      kristaps  139:        /*
                    140:         * First, establish the maximum columns of "visible" content.
                    141:         * This is usually the difference between the right-margin and
                    142:         * an indentation, but can be, for tagged lists or columns, a
1.115     kristaps  143:         * small set of values.
1.71      kristaps  144:         */
1.53      kristaps  145:
1.71      kristaps  146:        assert(p->offset < p->rmargin);
1.92      kristaps  147:
1.114     kristaps  148:        maxvis = (int)(p->rmargin - p->offset) - overstep < 0 ?
1.119     kristaps  149:                /* LINTED */
                    150:                0 : p->rmargin - p->offset - overstep;
1.114     kristaps  151:        mmax = (int)(p->maxrmargin - p->offset) - overstep < 0 ?
1.119     kristaps  152:                /* LINTED */
                    153:                0 : p->maxrmargin - p->offset - overstep;
1.92      kristaps  154:
1.71      kristaps  155:        bp = TERMP_NOBREAK & p->flags ? mmax : maxvis;
1.115     kristaps  156:
                    157:        /*
                    158:         * FIXME: if bp is zero, we still output the first word before
                    159:         * breaking the line.
                    160:         */
                    161:
1.71      kristaps  162:        vis = 0;
1.84      kristaps  163:
1.71      kristaps  164:        /*
                    165:         * If in the standard case (left-justified), then begin with our
                    166:         * indentation, otherwise (columns, etc.) just start spitting
                    167:         * out text.
                    168:         */
1.53      kristaps  169:
1.71      kristaps  170:        if ( ! (p->flags & TERMP_NOLPAD))
                    171:                /* LINTED */
                    172:                for (j = 0; j < (int)p->offset; j++)
                    173:                        putchar(' ');
                    174:
                    175:        for (i = 0; i < (int)p->col; i++) {
                    176:                /*
                    177:                 * Count up visible word characters.  Control sequences
                    178:                 * (starting with the CSI) aren't counted.  A space
                    179:                 * generates a non-printing word, which is valid (the
                    180:                 * space is printed according to regular spacing rules).
                    181:                 */
                    182:
                    183:                /* LINTED */
                    184:                for (j = i, vsz = 0; j < (int)p->col; j++) {
1.93      kristaps  185:                        if (j && ' ' == p->buf[j])
1.71      kristaps  186:                                break;
                    187:                        else if (8 == p->buf[j])
1.89      kristaps  188:                                vsz--;
1.71      kristaps  189:                        else
                    190:                                vsz++;
                    191:                }
1.53      kristaps  192:
1.71      kristaps  193:                /*
1.81      kristaps  194:                 * Choose the number of blanks to prepend: no blank at the
                    195:                 * beginning of a line, one between words -- but do not
                    196:                 * actually write them yet.
1.71      kristaps  197:                 */
1.81      kristaps  198:                vbl = (size_t)(0 == vis ? 0 : 1);
1.71      kristaps  199:
1.81      kristaps  200:                /*
                    201:                 * Find out whether we would exceed the right margin.
                    202:                 * If so, break to the next line.  (TODO: hyphenate)
                    203:                 * Otherwise, write the chosen number of blanks now.
                    204:                 */
                    205:                if (vis && vis + vbl + vsz > bp) {
                    206:                        putchar('\n');
                    207:                        if (TERMP_NOBREAK & p->flags) {
                    208:                                for (j = 0; j < (int)p->rmargin; j++)
                    209:                                        putchar(' ');
                    210:                                vis = p->rmargin - p->offset;
                    211:                        } else {
1.71      kristaps  212:                                for (j = 0; j < (int)p->offset; j++)
                    213:                                        putchar(' ');
                    214:                                vis = 0;
1.81      kristaps  215:                        }
1.104     kristaps  216:                        /* Remove the overstep width. */
1.112     kristaps  217:                        bp += (int)/* LINTED */
                    218:                                overstep;
1.110     kristaps  219:                        overstep = 0;
1.81      kristaps  220:                } else {
                    221:                        for (j = 0; j < (int)vbl; j++)
1.71      kristaps  222:                                putchar(' ');
1.81      kristaps  223:                        vis += vbl;
1.71      kristaps  224:                }
1.53      kristaps  225:
1.78      kristaps  226:                /*
1.81      kristaps  227:                 * Finally, write out the word.
1.71      kristaps  228:                 */
                    229:                for ( ; i < (int)p->col; i++) {
                    230:                        if (' ' == p->buf[i])
                    231:                                break;
                    232:                        putchar(p->buf[i]);
                    233:                }
                    234:                vis += vsz;
                    235:        }
1.111     kristaps  236:
1.91      kristaps  237:        p->col = 0;
1.111     kristaps  238:        overstep = 0;
1.15      kristaps  239:
1.91      kristaps  240:        if ( ! (TERMP_NOBREAK & p->flags)) {
                    241:                putchar('\n');
1.15      kristaps  242:                return;
1.71      kristaps  243:        }
1.15      kristaps  244:
1.91      kristaps  245:        if (TERMP_HANG & p->flags) {
                    246:                /* We need one blank after the tag. */
1.92      kristaps  247:                overstep = /* LINTED */
                    248:                        vis - maxvis + 1;
1.91      kristaps  249:
                    250:                /*
                    251:                 * Behave exactly the same way as groff:
1.92      kristaps  252:                 * If we have overstepped the margin, temporarily move
                    253:                 * it to the right and flag the rest of the line to be
                    254:                 * shorter.
1.91      kristaps  255:                 * If we landed right at the margin, be happy.
1.92      kristaps  256:                 * If we are one step before the margin, temporarily
                    257:                 * move it one step LEFT and flag the rest of the line
                    258:                 * to be longer.
1.91      kristaps  259:                 */
1.92      kristaps  260:                if (overstep >= -1) {
                    261:                        assert((int)maxvis + overstep >= 0);
                    262:                        /* LINTED */
1.91      kristaps  263:                        maxvis += overstep;
1.92      kristaps  264:                } else
1.91      kristaps  265:                        overstep = 0;
                    266:
                    267:        } else if (TERMP_DANGLE & p->flags)
                    268:                return;
1.15      kristaps  269:
1.92      kristaps  270:        /* Right-pad. */
                    271:        if (maxvis > vis + /* LINTED */
                    272:                        ((TERMP_TWOSPACE & p->flags) ? 1 : 0))
1.91      kristaps  273:                for ( ; vis < maxvis; vis++)
                    274:                        putchar(' ');
1.92      kristaps  275:        else {  /* ...or newline break. */
1.71      kristaps  276:                putchar('\n');
1.91      kristaps  277:                for (i = 0; i < (int)p->rmargin; i++)
                    278:                        putchar(' ');
                    279:        }
1.15      kristaps  280: }
                    281:
                    282:
1.71      kristaps  283: /*
                    284:  * A newline only breaks an existing line; it won't assert vertical
                    285:  * space.  All data in the output buffer is flushed prior to the newline
                    286:  * assertion.
                    287:  */
                    288: void
                    289: term_newln(struct termp *p)
1.15      kristaps  290: {
                    291:
1.71      kristaps  292:        p->flags |= TERMP_NOSPACE;
                    293:        if (0 == p->col) {
                    294:                p->flags &= ~TERMP_NOLPAD;
1.15      kristaps  295:                return;
1.16      kristaps  296:        }
1.71      kristaps  297:        term_flushln(p);
                    298:        p->flags &= ~TERMP_NOLPAD;
1.16      kristaps  299: }
                    300:
                    301:
1.71      kristaps  302: /*
                    303:  * Asserts a vertical space (a full, empty line-break between lines).
                    304:  * Note that if used twice, this will cause two blank spaces and so on.
                    305:  * All data in the output buffer is flushed prior to the newline
                    306:  * assertion.
                    307:  */
                    308: void
                    309: term_vspace(struct termp *p)
1.16      kristaps  310: {
                    311:
1.62      kristaps  312:        term_newln(p);
1.71      kristaps  313:        putchar('\n');
1.16      kristaps  314: }
                    315:
                    316:
1.71      kristaps  317: static void
1.95      kristaps  318: do_special(struct termp *p, const char *word, size_t len)
1.17      kristaps  319: {
1.71      kristaps  320:        const char      *rhs;
                    321:        size_t           sz;
1.79      kristaps  322:        int              i;
1.17      kristaps  323:
1.101     kristaps  324:        rhs = chars_a2ascii(p->symtab, word, len, &sz);
1.86      kristaps  325:
1.96      kristaps  326:        if (NULL == rhs) {
1.97      kristaps  327: #if 0
1.96      kristaps  328:                fputs("Unknown special character: ", stderr);
                    329:                for (i = 0; i < (int)len; i++)
                    330:                        fputc(word[i], stderr);
                    331:                fputc('\n', stderr);
                    332: #endif
1.94      kristaps  333:                return;
1.96      kristaps  334:        }
1.94      kristaps  335:        for (i = 0; i < (int)sz; i++)
1.95      kristaps  336:                encode(p, rhs[i]);
1.94      kristaps  337: }
                    338:
                    339:
                    340: static void
1.95      kristaps  341: do_reserved(struct termp *p, const char *word, size_t len)
1.94      kristaps  342: {
                    343:        const char      *rhs;
                    344:        size_t           sz;
                    345:        int              i;
                    346:
1.101     kristaps  347:        rhs = chars_a2res(p->symtab, word, len, &sz);
1.94      kristaps  348:
1.96      kristaps  349:        if (NULL == rhs) {
                    350: #if 0
                    351:                fputs("Unknown reserved word: ", stderr);
                    352:                for (i = 0; i < (int)len; i++)
                    353:                        fputc(word[i], stderr);
                    354:                fputc('\n', stderr);
                    355: #endif
1.94      kristaps  356:                return;
1.96      kristaps  357:        }
1.94      kristaps  358:        for (i = 0; i < (int)sz; i++)
1.95      kristaps  359:                encode(p, rhs[i]);
1.17      kristaps  360: }
                    361:
                    362:
1.71      kristaps  363: /*
                    364:  * Handle an escape sequence: determine its length and pass it to the
                    365:  * escape-symbol look table.  Note that we assume mdoc(3) has validated
                    366:  * the escape sequence (we assert upon badly-formed escape sequences).
                    367:  */
                    368: static void
1.95      kristaps  369: do_escaped(struct termp *p, const char **word)
1.17      kristaps  370: {
1.97      kristaps  371:        int              j, type;
1.86      kristaps  372:        const char      *wp;
                    373:
                    374:        wp = *word;
1.97      kristaps  375:        type = 1;
1.17      kristaps  376:
1.86      kristaps  377:        if (0 == *(++wp)) {
                    378:                *word = wp;
1.71      kristaps  379:                return;
1.86      kristaps  380:        }
1.17      kristaps  381:
1.86      kristaps  382:        if ('(' == *wp) {
                    383:                wp++;
                    384:                if (0 == *wp || 0 == *(wp + 1)) {
                    385:                        *word = 0 == *wp ? wp : wp + 1;
1.71      kristaps  386:                        return;
1.86      kristaps  387:                }
1.22      kristaps  388:
1.95      kristaps  389:                do_special(p, wp, 2);
1.86      kristaps  390:                *word = ++wp;
1.71      kristaps  391:                return;
1.22      kristaps  392:
1.86      kristaps  393:        } else if ('*' == *wp) {
                    394:                if (0 == *(++wp)) {
                    395:                        *word = wp;
1.71      kristaps  396:                        return;
1.86      kristaps  397:                }
1.22      kristaps  398:
1.86      kristaps  399:                switch (*wp) {
1.71      kristaps  400:                case ('('):
1.86      kristaps  401:                        wp++;
                    402:                        if (0 == *wp || 0 == *(wp + 1)) {
                    403:                                *word = 0 == *wp ? wp : wp + 1;
1.71      kristaps  404:                                return;
1.86      kristaps  405:                        }
1.65      kristaps  406:
1.95      kristaps  407:                        do_reserved(p, wp, 2);
1.86      kristaps  408:                        *word = ++wp;
1.71      kristaps  409:                        return;
                    410:                case ('['):
1.97      kristaps  411:                        type = 0;
1.71      kristaps  412:                        break;
                    413:                default:
1.95      kristaps  414:                        do_reserved(p, wp, 1);
1.86      kristaps  415:                        *word = wp;
1.71      kristaps  416:                        return;
                    417:                }
                    418:
1.86      kristaps  419:        } else if ('f' == *wp) {
                    420:                if (0 == *(++wp)) {
                    421:                        *word = wp;
1.71      kristaps  422:                        return;
1.86      kristaps  423:                }
                    424:
                    425:                switch (*wp) {
1.71      kristaps  426:                case ('B'):
1.98      kristaps  427:                        p->bold++;
1.71      kristaps  428:                        break;
                    429:                case ('I'):
1.98      kristaps  430:                        p->under++;
1.71      kristaps  431:                        break;
                    432:                case ('P'):
                    433:                        /* FALLTHROUGH */
                    434:                case ('R'):
1.98      kristaps  435:                        p->bold = p->under = 0;
1.71      kristaps  436:                        break;
                    437:                default:
                    438:                        break;
                    439:                }
1.86      kristaps  440:
                    441:                *word = wp;
1.71      kristaps  442:                return;
1.22      kristaps  443:
1.86      kristaps  444:        } else if ('[' != *wp) {
1.95      kristaps  445:                do_special(p, wp, 1);
1.86      kristaps  446:                *word = wp;
1.71      kristaps  447:                return;
                    448:        }
1.28      kristaps  449:
1.86      kristaps  450:        wp++;
                    451:        for (j = 0; *wp && ']' != *wp; wp++, j++)
1.71      kristaps  452:                /* Loop... */ ;
1.28      kristaps  453:
1.86      kristaps  454:        if (0 == *wp) {
                    455:                *word = wp;
1.71      kristaps  456:                return;
1.86      kristaps  457:        }
1.48      kristaps  458:
1.97      kristaps  459:        if (type)
                    460:                do_special(p, wp - j, (size_t)j);
                    461:        else
                    462:                do_reserved(p, wp - j, (size_t)j);
1.86      kristaps  463:        *word = wp;
1.48      kristaps  464: }
                    465:
                    466:
1.71      kristaps  467: /*
                    468:  * Handle pwords, partial words, which may be either a single word or a
                    469:  * phrase that cannot be broken down (such as a literal string).  This
                    470:  * handles word styling.
                    471:  */
1.86      kristaps  472: void
                    473: term_word(struct termp *p, const char *word)
1.65      kristaps  474: {
1.88      kristaps  475:        const char       *sv;
1.71      kristaps  476:
1.100     kristaps  477:        sv = word;
                    478:
                    479:        if (word[0] && 0 == word[1])
                    480:                switch (word[0]) {
                    481:                case('.'):
                    482:                        /* FALLTHROUGH */
                    483:                case(','):
                    484:                        /* FALLTHROUGH */
                    485:                case(';'):
                    486:                        /* FALLTHROUGH */
                    487:                case(':'):
                    488:                        /* FALLTHROUGH */
                    489:                case('?'):
                    490:                        /* FALLTHROUGH */
                    491:                case('!'):
                    492:                        /* FALLTHROUGH */
                    493:                case(')'):
                    494:                        /* FALLTHROUGH */
                    495:                case(']'):
                    496:                        /* FALLTHROUGH */
                    497:                case('}'):
                    498:                        if ( ! (TERMP_IGNDELIM & p->flags))
                    499:                                p->flags |= TERMP_NOSPACE;
                    500:                        break;
                    501:                default:
                    502:                        break;
                    503:                }
1.65      kristaps  504:
1.71      kristaps  505:        if ( ! (TERMP_NOSPACE & p->flags))
1.95      kristaps  506:                buffer(p, ' ');
1.65      kristaps  507:
1.71      kristaps  508:        if ( ! (p->flags & TERMP_NONOSPACE))
                    509:                p->flags &= ~TERMP_NOSPACE;
1.65      kristaps  510:
1.100     kristaps  511:        for ( ; *word; word++)
1.86      kristaps  512:                if ('\\' != *word)
1.95      kristaps  513:                        encode(p, *word);
1.79      kristaps  514:                else
1.95      kristaps  515:                        do_escaped(p, &word);
1.65      kristaps  516:
1.100     kristaps  517:        if (sv[0] && 0 == sv[1])
                    518:                switch (sv[0]) {
                    519:                case('('):
                    520:                        /* FALLTHROUGH */
                    521:                case('['):
                    522:                        /* FALLTHROUGH */
                    523:                case('{'):
                    524:                        p->flags |= TERMP_NOSPACE;
                    525:                        break;
                    526:                default:
                    527:                        break;
                    528:                }
1.65      kristaps  529: }
                    530:
                    531:
1.71      kristaps  532: /*
                    533:  * Insert a single character into the line-buffer.  If the buffer's
                    534:  * space is exceeded, then allocate more space by doubling the buffer
                    535:  * size.
                    536:  */
                    537: static void
1.95      kristaps  538: buffer(struct termp *p, char c)
1.51      kristaps  539: {
1.71      kristaps  540:        size_t           s;
1.51      kristaps  541:
1.71      kristaps  542:        if (p->col + 1 >= p->maxcols) {
                    543:                if (0 == p->maxcols)
                    544:                        p->maxcols = 256;
                    545:                s = p->maxcols * 2;
                    546:                p->buf = realloc(p->buf, s);
1.118     kristaps  547:                if (NULL == p->buf) {
1.120   ! kristaps  548:                        perror(NULL);
1.118     kristaps  549:                        exit(EXIT_FAILURE);
                    550:                }
1.71      kristaps  551:                p->maxcols = s;
                    552:        }
                    553:        p->buf[(int)(p->col)++] = c;
1.51      kristaps  554: }
                    555:
1.79      kristaps  556:
                    557: static void
1.95      kristaps  558: encode(struct termp *p, char c)
1.79      kristaps  559: {
1.89      kristaps  560:
1.98      kristaps  561:        if (' ' != c) {
1.109     kristaps  562:                if (p->under) {
                    563:                        buffer(p, '_');
                    564:                        buffer(p, 8);
                    565:                }
1.98      kristaps  566:                if (p->bold) {
1.95      kristaps  567:                        buffer(p, c);
                    568:                        buffer(p, 8);
1.79      kristaps  569:                }
                    570:        }
1.95      kristaps  571:        buffer(p, c);
1.79      kristaps  572: }
1.106     kristaps  573:
                    574:
1.107     kristaps  575: size_t
                    576: term_vspan(const struct roffsu *su)
1.106     kristaps  577: {
                    578:        double           r;
                    579:
1.107     kristaps  580:        switch (su->unit) {
1.106     kristaps  581:        case (SCALE_CM):
1.107     kristaps  582:                r = su->scale * 2;
1.106     kristaps  583:                break;
                    584:        case (SCALE_IN):
1.107     kristaps  585:                r = su->scale * 6;
1.106     kristaps  586:                break;
                    587:        case (SCALE_PC):
1.107     kristaps  588:                r = su->scale;
1.106     kristaps  589:                break;
                    590:        case (SCALE_PT):
1.107     kristaps  591:                r = su->scale / 8;
1.106     kristaps  592:                break;
                    593:        case (SCALE_MM):
1.107     kristaps  594:                r = su->scale / 1000;
1.106     kristaps  595:                break;
                    596:        case (SCALE_VS):
1.107     kristaps  597:                r = su->scale;
1.106     kristaps  598:                break;
                    599:        default:
1.107     kristaps  600:                r = su->scale - 1;
1.106     kristaps  601:                break;
                    602:        }
                    603:
                    604:        if (r < 0.0)
                    605:                r = 0.0;
1.107     kristaps  606:        return(/* LINTED */(size_t)
1.106     kristaps  607:                        r);
                    608: }
                    609:
                    610:
1.107     kristaps  611: size_t
                    612: term_hspan(const struct roffsu *su)
1.106     kristaps  613: {
                    614:        double           r;
                    615:
1.108     kristaps  616:        /* XXX: CM, IN, and PT are approximations. */
                    617:
1.107     kristaps  618:        switch (su->unit) {
1.106     kristaps  619:        case (SCALE_CM):
1.108     kristaps  620:                r = 4 * su->scale;
1.106     kristaps  621:                break;
                    622:        case (SCALE_IN):
1.108     kristaps  623:                /* XXX: this is an approximation. */
                    624:                r = 10 * su->scale;
1.106     kristaps  625:                break;
                    626:        case (SCALE_PC):
1.108     kristaps  627:                r = (10 * su->scale) / 6;
1.106     kristaps  628:                break;
                    629:        case (SCALE_PT):
1.108     kristaps  630:                r = (10 * su->scale) / 72;
1.106     kristaps  631:                break;
                    632:        case (SCALE_MM):
1.107     kristaps  633:                r = su->scale / 1000; /* FIXME: double-check. */
1.106     kristaps  634:                break;
                    635:        case (SCALE_VS):
1.107     kristaps  636:                r = su->scale * 2 - 1; /* FIXME: double-check. */
1.106     kristaps  637:                break;
                    638:        default:
1.107     kristaps  639:                r = su->scale;
1.106     kristaps  640:                break;
                    641:        }
                    642:
                    643:        if (r < 0.0)
                    644:                r = 0.0;
1.107     kristaps  645:        return((size_t)/* LINTED */
1.106     kristaps  646:                        r);
                    647: }
                    648:
                    649:

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