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Annotation of mandoc/term.c, Revision 1.147

1.147   ! kristaps    1: /*     $Id: term.c,v 1.146 2010/06/08 15:00:17 kristaps Exp $ */
1.1       kristaps    2: /*
1.75      kristaps    3:  * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
1.1       kristaps    4:  *
                      5:  * Permission to use, copy, modify, and distribute this software for any
1.74      kristaps    6:  * purpose with or without fee is hereby granted, provided that the above
                      7:  * copyright notice and this permission notice appear in all copies.
1.1       kristaps    8:  *
1.74      kristaps    9:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                     10:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     11:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     12:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     13:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     14:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     15:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.1       kristaps   16:  */
1.128     kristaps   17: #ifdef HAVE_CONFIG_H
                     18: #include "config.h"
                     19: #endif
                     20:
1.126     kristaps   21: #include <sys/types.h>
                     22:
1.1       kristaps   23: #include <assert.h>
1.122     kristaps   24: #include <ctype.h>
1.141     kristaps   25: #include <stdint.h>
1.22      kristaps   26: #include <stdio.h>
1.1       kristaps   27: #include <stdlib.h>
                     28: #include <string.h>
                     29:
1.137     kristaps   30: #include "mandoc.h"
1.101     kristaps   31: #include "chars.h"
1.107     kristaps   32: #include "out.h"
1.71      kristaps   33: #include "term.h"
                     34: #include "man.h"
                     35: #include "mdoc.h"
1.105     kristaps   36: #include "main.h"
1.1       kristaps   37:
1.125     kristaps   38: static void              spec(struct termp *, const char *, size_t);
                     39: static void              res(struct termp *, const char *, size_t);
                     40: static void              buffera(struct termp *, const char *, size_t);
                     41: static void              bufferc(struct termp *, char);
                     42: static void              adjbuf(struct termp *p, size_t);
                     43: static void              encode(struct termp *, const char *, size_t);
1.11      kristaps   44:
                     45:
1.145     kristaps   46: void
1.71      kristaps   47: term_free(struct termp *p)
1.14      kristaps   48: {
                     49:
1.71      kristaps   50:        if (p->buf)
                     51:                free(p->buf);
1.102     kristaps   52:        if (p->symtab)
1.101     kristaps   53:                chars_free(p->symtab);
1.145     kristaps   54:
1.142     kristaps   55:        free(p);
                     56: }
                     57:
                     58:
                     59: void
                     60: term_begin(struct termp *p, term_margin head,
                     61:                term_margin foot, const void *arg)
                     62: {
                     63:
                     64:        p->headf = head;
                     65:        p->footf = foot;
                     66:        p->argf = arg;
1.146     kristaps   67:        (*p->begin)(p);
1.142     kristaps   68: }
                     69:
                     70:
                     71: void
                     72: term_end(struct termp *p)
                     73: {
                     74:
1.146     kristaps   75:        (*p->end)(p);
1.14      kristaps   76: }
                     77:
                     78:
1.145     kristaps   79: struct termp *
                     80: term_alloc(enum termenc enc)
1.14      kristaps   81: {
1.141     kristaps   82:        struct termp    *p;
1.14      kristaps   83:
1.117     kristaps   84:        p = calloc(1, sizeof(struct termp));
                     85:        if (NULL == p) {
1.120     kristaps   86:                perror(NULL);
1.117     kristaps   87:                exit(EXIT_FAILURE);
                     88:        }
1.141     kristaps   89:
1.138     schwarze   90:        p->tabwidth = 5;
1.71      kristaps   91:        p->enc = enc;
1.145     kristaps   92:        p->defrmargin = 78;
1.71      kristaps   93:        return(p);
1.14      kristaps   94: }
                     95:
                     96:
1.71      kristaps   97: /*
                     98:  * Flush a line of text.  A "line" is loosely defined as being something
                     99:  * that should be followed by a newline, regardless of whether it's
                    100:  * broken apart by newlines getting there.  A line can also be a
1.130     kristaps  101:  * fragment of a columnar list (`Bl -tag' or `Bl -column'), which does
                    102:  * not have a trailing newline.
1.71      kristaps  103:  *
1.130     kristaps  104:  * The following flags may be specified:
1.71      kristaps  105:  *
                    106:  *  - TERMP_NOLPAD: when beginning to write the line, don't left-pad the
                    107:  *    offset value.  This is useful when doing columnar lists where the
                    108:  *    prior column has right-padded.
                    109:  *
                    110:  *  - TERMP_NOBREAK: this is the most important and is used when making
                    111:  *    columns.  In short: don't print a newline and instead pad to the
                    112:  *    right margin.  Used in conjunction with TERMP_NOLPAD.
                    113:  *
1.91      kristaps  114:  *  - TERMP_TWOSPACE: when padding, make sure there are at least two
                    115:  *    space characters of padding.  Otherwise, rather break the line.
                    116:  *
1.84      kristaps  117:  *  - TERMP_DANGLE: don't newline when TERMP_NOBREAK is specified and
                    118:  *    the line is overrun, and don't pad-right if it's underrun.
                    119:  *
                    120:  *  - TERMP_HANG: like TERMP_DANGLE, but doesn't newline when
                    121:  *    overruning, instead save the position and continue at that point
                    122:  *    when the next invocation.
1.71      kristaps  123:  *
                    124:  *  In-line line breaking:
                    125:  *
                    126:  *  If TERMP_NOBREAK is specified and the line overruns the right
                    127:  *  margin, it will break and pad-right to the right margin after
                    128:  *  writing.  If maxrmargin is violated, it will break and continue
1.114     kristaps  129:  *  writing from the right-margin, which will lead to the above scenario
                    130:  *  upon exit.  Otherwise, the line will break at the right margin.
1.71      kristaps  131:  */
                    132: void
                    133: term_flushln(struct termp *p)
1.53      kristaps  134: {
1.114     kristaps  135:        int              i;     /* current input position in p->buf */
                    136:        size_t           vis;   /* current visual position on output */
                    137:        size_t           vbl;   /* number of blanks to prepend to output */
1.136     schwarze  138:        size_t           vend;  /* end of word visual position on output */
1.114     kristaps  139:        size_t           bp;    /* visual right border position */
                    140:        int              j;     /* temporary loop index */
1.140     kristaps  141:        int              jhy;   /* last hyphen before line overflow */
1.114     kristaps  142:        size_t           maxvis, mmax;
1.53      kristaps  143:
1.71      kristaps  144:        /*
                    145:         * First, establish the maximum columns of "visible" content.
                    146:         * This is usually the difference between the right-margin and
                    147:         * an indentation, but can be, for tagged lists or columns, a
1.115     kristaps  148:         * small set of values.
1.71      kristaps  149:         */
1.53      kristaps  150:
1.71      kristaps  151:        assert(p->offset < p->rmargin);
1.92      kristaps  152:
1.129     kristaps  153:        maxvis = (int)(p->rmargin - p->offset) - p->overstep < 0 ?
1.119     kristaps  154:                /* LINTED */
1.129     kristaps  155:                0 : p->rmargin - p->offset - p->overstep;
                    156:        mmax = (int)(p->maxrmargin - p->offset) - p->overstep < 0 ?
1.119     kristaps  157:                /* LINTED */
1.129     kristaps  158:                0 : p->maxrmargin - p->offset - p->overstep;
1.92      kristaps  159:
1.71      kristaps  160:        bp = TERMP_NOBREAK & p->flags ? mmax : maxvis;
1.115     kristaps  161:
1.136     schwarze  162:        /*
                    163:         * Indent the first line of a paragraph.
                    164:         */
                    165:        vbl = p->flags & TERMP_NOLPAD ? 0 : p->offset;
                    166:
1.115     kristaps  167:        /*
                    168:         * FIXME: if bp is zero, we still output the first word before
                    169:         * breaking the line.
                    170:         */
                    171:
1.136     schwarze  172:        vis = vend = i = 0;
                    173:        while (i < (int)p->col) {
1.71      kristaps  174:
                    175:                /*
1.138     schwarze  176:                 * Handle literal tab characters.
                    177:                 */
                    178:                for (j = i; j < (int)p->col; j++) {
                    179:                        if ('\t' != p->buf[j])
                    180:                                break;
                    181:                        vend = (vis/p->tabwidth+1)*p->tabwidth;
                    182:                        vbl += vend - vis;
                    183:                        vis = vend;
                    184:                }
                    185:
                    186:                /*
1.71      kristaps  187:                 * Count up visible word characters.  Control sequences
                    188:                 * (starting with the CSI) aren't counted.  A space
                    189:                 * generates a non-printing word, which is valid (the
                    190:                 * space is printed according to regular spacing rules).
                    191:                 */
                    192:
                    193:                /* LINTED */
1.140     kristaps  194:                for (jhy = 0; j < (int)p->col; j++) {
1.138     schwarze  195:                        if ((j && ' ' == p->buf[j]) || '\t' == p->buf[j])
1.71      kristaps  196:                                break;
1.140     kristaps  197:                        if (8 != p->buf[j]) {
                    198:                                if (vend > vis && vend < bp &&
                    199:                                    ASCII_HYPH == p->buf[j])
                    200:                                        jhy = j;
                    201:                                vend++;
                    202:                        } else
1.136     schwarze  203:                                vend--;
1.71      kristaps  204:                }
1.53      kristaps  205:
1.71      kristaps  206:                /*
1.81      kristaps  207:                 * Find out whether we would exceed the right margin.
1.136     schwarze  208:                 * If so, break to the next line.
1.81      kristaps  209:                 */
1.140     kristaps  210:                if (vend > bp && 0 == jhy && vis > 0) {
1.136     schwarze  211:                        vend -= vis;
1.146     kristaps  212:                        (*p->endline)(p);
1.81      kristaps  213:                        if (TERMP_NOBREAK & p->flags) {
1.139     schwarze  214:                                p->viscol = p->rmargin;
1.146     kristaps  215:                                (*p->advance)(p, p->rmargin);
1.136     schwarze  216:                                vend += p->rmargin - p->offset;
1.81      kristaps  217:                        } else {
1.139     schwarze  218:                                p->viscol = 0;
1.136     schwarze  219:                                vbl = p->offset;
1.81      kristaps  220:                        }
1.130     kristaps  221:
1.129     kristaps  222:                        /* Remove the p->overstep width. */
1.130     kristaps  223:
1.112     kristaps  224:                        bp += (int)/* LINTED */
1.129     kristaps  225:                                p->overstep;
                    226:                        p->overstep = 0;
1.71      kristaps  227:                }
1.53      kristaps  228:
1.138     schwarze  229:                /*
                    230:                 * Skip leading tabs, they were handled above.
                    231:                 */
                    232:                while (i < (int)p->col && '\t' == p->buf[i])
                    233:                        i++;
                    234:
1.130     kristaps  235:                /* Write out the [remaining] word. */
1.136     schwarze  236:                for ( ; i < (int)p->col; i++) {
1.140     kristaps  237:                        if (vend > bp && jhy > 0 && i > jhy)
                    238:                                break;
1.138     schwarze  239:                        if ('\t' == p->buf[i])
                    240:                                break;
1.136     schwarze  241:                        if (' ' == p->buf[i]) {
                    242:                                while (' ' == p->buf[i]) {
                    243:                                        vbl++;
                    244:                                        i++;
                    245:                                }
1.71      kristaps  246:                                break;
1.136     schwarze  247:                        }
                    248:                        if (ASCII_NBRSP == p->buf[i]) {
                    249:                                vbl++;
                    250:                                continue;
                    251:                        }
1.130     kristaps  252:
1.136     schwarze  253:                        /*
                    254:                         * Now we definitely know there will be
                    255:                         * printable characters to output,
                    256:                         * so write preceding white space now.
                    257:                         */
                    258:                        if (vbl) {
1.146     kristaps  259:                                (*p->advance)(p, vbl);
1.139     schwarze  260:                                p->viscol += vbl;
1.136     schwarze  261:                                vbl = 0;
                    262:                        }
1.140     kristaps  263:
                    264:                        if (ASCII_HYPH == p->buf[i])
1.146     kristaps  265:                                (*p->letter)(p, '-');
1.140     kristaps  266:                        else
1.146     kristaps  267:                                (*p->letter)(p, p->buf[i]);
1.140     kristaps  268:
1.139     schwarze  269:                        p->viscol += 1;
1.136     schwarze  270:                }
                    271:                vend += vbl;
                    272:                vis = vend;
1.71      kristaps  273:        }
1.111     kristaps  274:
1.91      kristaps  275:        p->col = 0;
1.129     kristaps  276:        p->overstep = 0;
1.15      kristaps  277:
1.91      kristaps  278:        if ( ! (TERMP_NOBREAK & p->flags)) {
1.139     schwarze  279:                p->viscol = 0;
1.146     kristaps  280:                (*p->endline)(p);
1.15      kristaps  281:                return;
1.71      kristaps  282:        }
1.15      kristaps  283:
1.91      kristaps  284:        if (TERMP_HANG & p->flags) {
                    285:                /* We need one blank after the tag. */
1.129     kristaps  286:                p->overstep = /* LINTED */
1.92      kristaps  287:                        vis - maxvis + 1;
1.91      kristaps  288:
                    289:                /*
                    290:                 * Behave exactly the same way as groff:
1.92      kristaps  291:                 * If we have overstepped the margin, temporarily move
                    292:                 * it to the right and flag the rest of the line to be
                    293:                 * shorter.
1.91      kristaps  294:                 * If we landed right at the margin, be happy.
1.92      kristaps  295:                 * If we are one step before the margin, temporarily
                    296:                 * move it one step LEFT and flag the rest of the line
                    297:                 * to be longer.
1.91      kristaps  298:                 */
1.129     kristaps  299:                if (p->overstep >= -1) {
                    300:                        assert((int)maxvis + p->overstep >= 0);
1.92      kristaps  301:                        /* LINTED */
1.129     kristaps  302:                        maxvis += p->overstep;
1.92      kristaps  303:                } else
1.129     kristaps  304:                        p->overstep = 0;
1.91      kristaps  305:
                    306:        } else if (TERMP_DANGLE & p->flags)
                    307:                return;
1.15      kristaps  308:
1.92      kristaps  309:        /* Right-pad. */
                    310:        if (maxvis > vis + /* LINTED */
1.139     schwarze  311:                        ((TERMP_TWOSPACE & p->flags) ? 1 : 0)) {
                    312:                p->viscol += maxvis - vis;
1.146     kristaps  313:                (*p->advance)(p, maxvis - vis);
1.142     kristaps  314:                vis += (maxvis - vis);
1.139     schwarze  315:        } else {        /* ...or newline break. */
1.146     kristaps  316:                (*p->endline)(p);
1.139     schwarze  317:                p->viscol = p->rmargin;
1.146     kristaps  318:                (*p->advance)(p, p->rmargin);
1.91      kristaps  319:        }
1.15      kristaps  320: }
                    321:
                    322:
1.71      kristaps  323: /*
                    324:  * A newline only breaks an existing line; it won't assert vertical
                    325:  * space.  All data in the output buffer is flushed prior to the newline
                    326:  * assertion.
                    327:  */
                    328: void
                    329: term_newln(struct termp *p)
1.15      kristaps  330: {
                    331:
1.71      kristaps  332:        p->flags |= TERMP_NOSPACE;
1.139     schwarze  333:        if (0 == p->col && 0 == p->viscol) {
1.71      kristaps  334:                p->flags &= ~TERMP_NOLPAD;
1.15      kristaps  335:                return;
1.16      kristaps  336:        }
1.71      kristaps  337:        term_flushln(p);
                    338:        p->flags &= ~TERMP_NOLPAD;
1.16      kristaps  339: }
                    340:
                    341:
1.71      kristaps  342: /*
                    343:  * Asserts a vertical space (a full, empty line-break between lines).
                    344:  * Note that if used twice, this will cause two blank spaces and so on.
                    345:  * All data in the output buffer is flushed prior to the newline
                    346:  * assertion.
                    347:  */
                    348: void
                    349: term_vspace(struct termp *p)
1.16      kristaps  350: {
                    351:
1.62      kristaps  352:        term_newln(p);
1.139     schwarze  353:        p->viscol = 0;
1.146     kristaps  354:        (*p->endline)(p);
1.16      kristaps  355: }
                    356:
                    357:
1.71      kristaps  358: static void
1.125     kristaps  359: spec(struct termp *p, const char *word, size_t len)
1.17      kristaps  360: {
1.71      kristaps  361:        const char      *rhs;
                    362:        size_t           sz;
1.17      kristaps  363:
1.101     kristaps  364:        rhs = chars_a2ascii(p->symtab, word, len, &sz);
1.125     kristaps  365:        if (rhs)
                    366:                encode(p, rhs, sz);
1.94      kristaps  367: }
                    368:
                    369:
                    370: static void
1.125     kristaps  371: res(struct termp *p, const char *word, size_t len)
1.94      kristaps  372: {
                    373:        const char      *rhs;
                    374:        size_t           sz;
                    375:
1.101     kristaps  376:        rhs = chars_a2res(p->symtab, word, len, &sz);
1.125     kristaps  377:        if (rhs)
                    378:                encode(p, rhs, sz);
                    379: }
                    380:
                    381:
                    382: void
                    383: term_fontlast(struct termp *p)
                    384: {
                    385:        enum termfont    f;
                    386:
                    387:        f = p->fontl;
                    388:        p->fontl = p->fontq[p->fonti];
                    389:        p->fontq[p->fonti] = f;
                    390: }
                    391:
                    392:
                    393: void
                    394: term_fontrepl(struct termp *p, enum termfont f)
                    395: {
                    396:
                    397:        p->fontl = p->fontq[p->fonti];
                    398:        p->fontq[p->fonti] = f;
                    399: }
                    400:
                    401:
                    402: void
                    403: term_fontpush(struct termp *p, enum termfont f)
                    404: {
                    405:
                    406:        assert(p->fonti + 1 < 10);
                    407:        p->fontl = p->fontq[p->fonti];
                    408:        p->fontq[++p->fonti] = f;
                    409: }
                    410:
                    411:
                    412: const void *
                    413: term_fontq(struct termp *p)
                    414: {
                    415:
                    416:        return(&p->fontq[p->fonti]);
                    417: }
                    418:
                    419:
                    420: enum termfont
                    421: term_fonttop(struct termp *p)
                    422: {
                    423:
                    424:        return(p->fontq[p->fonti]);
                    425: }
                    426:
                    427:
                    428: void
                    429: term_fontpopq(struct termp *p, const void *key)
                    430: {
                    431:
                    432:        while (p->fonti >= 0 && key != &p->fontq[p->fonti])
                    433:                p->fonti--;
                    434:        assert(p->fonti >= 0);
                    435: }
1.94      kristaps  436:
1.125     kristaps  437:
                    438: void
                    439: term_fontpop(struct termp *p)
                    440: {
                    441:
                    442:        assert(p->fonti);
                    443:        p->fonti--;
1.17      kristaps  444: }
                    445:
                    446:
1.71      kristaps  447: /*
                    448:  * Handle pwords, partial words, which may be either a single word or a
                    449:  * phrase that cannot be broken down (such as a literal string).  This
                    450:  * handles word styling.
                    451:  */
1.86      kristaps  452: void
                    453: term_word(struct termp *p, const char *word)
1.65      kristaps  454: {
1.124     kristaps  455:        const char      *sv, *seq;
1.125     kristaps  456:        int              sz;
1.124     kristaps  457:        size_t           ssz;
                    458:        enum roffdeco    deco;
1.71      kristaps  459:
1.100     kristaps  460:        sv = word;
                    461:
1.123     kristaps  462:        if (word[0] && '\0' == word[1])
1.100     kristaps  463:                switch (word[0]) {
                    464:                case('.'):
                    465:                        /* FALLTHROUGH */
                    466:                case(','):
                    467:                        /* FALLTHROUGH */
                    468:                case(';'):
                    469:                        /* FALLTHROUGH */
                    470:                case(':'):
                    471:                        /* FALLTHROUGH */
                    472:                case('?'):
                    473:                        /* FALLTHROUGH */
                    474:                case('!'):
                    475:                        /* FALLTHROUGH */
                    476:                case(')'):
                    477:                        /* FALLTHROUGH */
                    478:                case(']'):
                    479:                        if ( ! (TERMP_IGNDELIM & p->flags))
                    480:                                p->flags |= TERMP_NOSPACE;
                    481:                        break;
                    482:                default:
                    483:                        break;
                    484:                }
1.65      kristaps  485:
1.133     kristaps  486:        if ( ! (TERMP_NOSPACE & p->flags)) {
1.125     kristaps  487:                bufferc(p, ' ');
1.133     kristaps  488:                if (TERMP_SENTENCE & p->flags)
                    489:                        bufferc(p, ' ');
                    490:        }
1.65      kristaps  491:
1.71      kristaps  492:        if ( ! (p->flags & TERMP_NONOSPACE))
                    493:                p->flags &= ~TERMP_NOSPACE;
1.133     kristaps  494:
                    495:        p->flags &= ~TERMP_SENTENCE;
1.65      kristaps  496:
1.125     kristaps  497:        /* FIXME: use strcspn. */
1.124     kristaps  498:
                    499:        while (*word) {
                    500:                if ('\\' != *word) {
1.125     kristaps  501:                        encode(p, word, 1);
1.124     kristaps  502:                        word++;
                    503:                        continue;
                    504:                }
                    505:
                    506:                seq = ++word;
                    507:                sz = a2roffdeco(&deco, &seq, &ssz);
                    508:
                    509:                switch (deco) {
                    510:                case (DECO_RESERVED):
1.125     kristaps  511:                        res(p, seq, ssz);
1.124     kristaps  512:                        break;
                    513:                case (DECO_SPECIAL):
1.125     kristaps  514:                        spec(p, seq, ssz);
1.124     kristaps  515:                        break;
                    516:                case (DECO_BOLD):
1.125     kristaps  517:                        term_fontrepl(p, TERMFONT_BOLD);
1.124     kristaps  518:                        break;
                    519:                case (DECO_ITALIC):
1.125     kristaps  520:                        term_fontrepl(p, TERMFONT_UNDER);
1.124     kristaps  521:                        break;
                    522:                case (DECO_ROMAN):
1.125     kristaps  523:                        term_fontrepl(p, TERMFONT_NONE);
1.124     kristaps  524:                        break;
                    525:                case (DECO_PREVIOUS):
1.125     kristaps  526:                        term_fontlast(p);
1.124     kristaps  527:                        break;
                    528:                default:
                    529:                        break;
                    530:                }
1.127     kristaps  531:
1.124     kristaps  532:                word += sz;
1.127     kristaps  533:                if (DECO_NOSPACE == deco && '\0' == *word)
                    534:                        p->flags |= TERMP_NOSPACE;
1.124     kristaps  535:        }
1.65      kristaps  536:
1.131     kristaps  537:        /*
                    538:         * Note that we don't process the pipe: the parser sees it as
                    539:         * punctuation, but we don't in terms of typography.
                    540:         */
1.100     kristaps  541:        if (sv[0] && 0 == sv[1])
                    542:                switch (sv[0]) {
                    543:                case('('):
                    544:                        /* FALLTHROUGH */
                    545:                case('['):
                    546:                        p->flags |= TERMP_NOSPACE;
                    547:                        break;
                    548:                default:
                    549:                        break;
                    550:                }
1.65      kristaps  551: }
                    552:
                    553:
1.71      kristaps  554: static void
1.125     kristaps  555: adjbuf(struct termp *p, size_t sz)
1.51      kristaps  556: {
                    557:
1.125     kristaps  558:        if (0 == p->maxcols)
                    559:                p->maxcols = 1024;
                    560:        while (sz >= p->maxcols)
                    561:                p->maxcols <<= 2;
                    562:
                    563:        p->buf = realloc(p->buf, p->maxcols);
                    564:        if (NULL == p->buf) {
                    565:                perror(NULL);
                    566:                exit(EXIT_FAILURE);
1.71      kristaps  567:        }
1.51      kristaps  568: }
                    569:
1.79      kristaps  570:
                    571: static void
1.125     kristaps  572: buffera(struct termp *p, const char *word, size_t sz)
1.79      kristaps  573: {
1.125     kristaps  574:
                    575:        if (p->col + sz >= p->maxcols)
                    576:                adjbuf(p, p->col + sz);
                    577:
1.126     kristaps  578:        memcpy(&p->buf[(int)p->col], word, sz);
1.125     kristaps  579:        p->col += sz;
                    580: }
                    581:
                    582:
                    583: static void
                    584: bufferc(struct termp *p, char c)
                    585: {
                    586:
                    587:        if (p->col + 1 >= p->maxcols)
                    588:                adjbuf(p, p->col + 1);
                    589:
1.126     kristaps  590:        p->buf[(int)p->col++] = c;
1.125     kristaps  591: }
                    592:
                    593:
                    594: static void
                    595: encode(struct termp *p, const char *word, size_t sz)
                    596: {
                    597:        enum termfont     f;
                    598:        int               i;
                    599:
                    600:        /*
                    601:         * Encode and buffer a string of characters.  If the current
                    602:         * font mode is unset, buffer directly, else encode then buffer
                    603:         * character by character.
                    604:         */
                    605:
1.147   ! kristaps  606:        if (TERMFONT_NONE == (f = term_fonttop(p))) {
1.125     kristaps  607:                buffera(p, word, sz);
                    608:                return;
                    609:        }
                    610:
                    611:        for (i = 0; i < (int)sz; i++) {
                    612:                if ( ! isgraph((u_char)word[i])) {
                    613:                        bufferc(p, word[i]);
                    614:                        continue;
1.79      kristaps  615:                }
1.125     kristaps  616:
                    617:                if (TERMFONT_UNDER == f)
                    618:                        bufferc(p, '_');
                    619:                else
                    620:                        bufferc(p, word[i]);
                    621:
                    622:                bufferc(p, 8);
                    623:                bufferc(p, word[i]);
1.79      kristaps  624:        }
                    625: }
1.106     kristaps  626:
                    627:
1.107     kristaps  628: size_t
                    629: term_vspan(const struct roffsu *su)
1.106     kristaps  630: {
                    631:        double           r;
                    632:
1.107     kristaps  633:        switch (su->unit) {
1.106     kristaps  634:        case (SCALE_CM):
1.107     kristaps  635:                r = su->scale * 2;
1.106     kristaps  636:                break;
                    637:        case (SCALE_IN):
1.107     kristaps  638:                r = su->scale * 6;
1.106     kristaps  639:                break;
                    640:        case (SCALE_PC):
1.107     kristaps  641:                r = su->scale;
1.106     kristaps  642:                break;
                    643:        case (SCALE_PT):
1.107     kristaps  644:                r = su->scale / 8;
1.106     kristaps  645:                break;
                    646:        case (SCALE_MM):
1.107     kristaps  647:                r = su->scale / 1000;
1.106     kristaps  648:                break;
                    649:        case (SCALE_VS):
1.107     kristaps  650:                r = su->scale;
1.106     kristaps  651:                break;
                    652:        default:
1.107     kristaps  653:                r = su->scale - 1;
1.106     kristaps  654:                break;
                    655:        }
                    656:
                    657:        if (r < 0.0)
                    658:                r = 0.0;
1.107     kristaps  659:        return(/* LINTED */(size_t)
1.106     kristaps  660:                        r);
                    661: }
                    662:
                    663:
1.107     kristaps  664: size_t
                    665: term_hspan(const struct roffsu *su)
1.106     kristaps  666: {
                    667:        double           r;
                    668:
1.108     kristaps  669:        /* XXX: CM, IN, and PT are approximations. */
                    670:
1.107     kristaps  671:        switch (su->unit) {
1.106     kristaps  672:        case (SCALE_CM):
1.108     kristaps  673:                r = 4 * su->scale;
1.106     kristaps  674:                break;
                    675:        case (SCALE_IN):
1.108     kristaps  676:                /* XXX: this is an approximation. */
                    677:                r = 10 * su->scale;
1.106     kristaps  678:                break;
                    679:        case (SCALE_PC):
1.108     kristaps  680:                r = (10 * su->scale) / 6;
1.106     kristaps  681:                break;
                    682:        case (SCALE_PT):
1.108     kristaps  683:                r = (10 * su->scale) / 72;
1.106     kristaps  684:                break;
                    685:        case (SCALE_MM):
1.107     kristaps  686:                r = su->scale / 1000; /* FIXME: double-check. */
1.106     kristaps  687:                break;
                    688:        case (SCALE_VS):
1.107     kristaps  689:                r = su->scale * 2 - 1; /* FIXME: double-check. */
1.106     kristaps  690:                break;
                    691:        default:
1.107     kristaps  692:                r = su->scale;
1.106     kristaps  693:                break;
                    694:        }
                    695:
                    696:        if (r < 0.0)
                    697:                r = 0.0;
1.107     kristaps  698:        return((size_t)/* LINTED */
1.106     kristaps  699:                        r);
                    700: }
                    701:
                    702:

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