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Annotation of mandoc/term.c, Revision 1.153

1.153   ! kristaps    1: /*     $Id: term.c,v 1.152 2010/06/28 09:48:44 kristaps Exp $ */
1.1       kristaps    2: /*
1.148     kristaps    3:  * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@bsd.lv>
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"
1.105     kristaps   34: #include "main.h"
1.1       kristaps   35:
1.125     kristaps   36: static void              spec(struct termp *, const char *, size_t);
                     37: static void              res(struct termp *, const char *, size_t);
                     38: static void              buffera(struct termp *, const char *, size_t);
                     39: static void              bufferc(struct termp *, char);
                     40: static void              adjbuf(struct termp *p, size_t);
                     41: static void              encode(struct termp *, const char *, size_t);
1.11      kristaps   42:
                     43:
1.145     kristaps   44: void
1.71      kristaps   45: term_free(struct termp *p)
1.14      kristaps   46: {
                     47:
1.71      kristaps   48:        if (p->buf)
                     49:                free(p->buf);
1.102     kristaps   50:        if (p->symtab)
1.101     kristaps   51:                chars_free(p->symtab);
1.145     kristaps   52:
1.142     kristaps   53:        free(p);
                     54: }
                     55:
                     56:
                     57: void
                     58: term_begin(struct termp *p, term_margin head,
                     59:                term_margin foot, const void *arg)
                     60: {
                     61:
                     62:        p->headf = head;
                     63:        p->footf = foot;
                     64:        p->argf = arg;
1.146     kristaps   65:        (*p->begin)(p);
1.142     kristaps   66: }
                     67:
                     68:
                     69: void
                     70: term_end(struct termp *p)
                     71: {
                     72:
1.146     kristaps   73:        (*p->end)(p);
1.14      kristaps   74: }
                     75:
                     76:
1.145     kristaps   77: struct termp *
                     78: term_alloc(enum termenc enc)
1.14      kristaps   79: {
1.141     kristaps   80:        struct termp    *p;
1.14      kristaps   81:
1.117     kristaps   82:        p = calloc(1, sizeof(struct termp));
                     83:        if (NULL == p) {
1.120     kristaps   84:                perror(NULL);
1.117     kristaps   85:                exit(EXIT_FAILURE);
                     86:        }
1.141     kristaps   87:
1.71      kristaps   88:        p->enc = enc;
                     89:        return(p);
1.14      kristaps   90: }
                     91:
                     92:
1.71      kristaps   93: /*
                     94:  * Flush a line of text.  A "line" is loosely defined as being something
                     95:  * that should be followed by a newline, regardless of whether it's
                     96:  * broken apart by newlines getting there.  A line can also be a
1.130     kristaps   97:  * fragment of a columnar list (`Bl -tag' or `Bl -column'), which does
                     98:  * not have a trailing newline.
1.71      kristaps   99:  *
1.130     kristaps  100:  * The following flags may be specified:
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 */
1.136     schwarze  134:        size_t           vend;  /* end of word visual position on output */
1.114     kristaps  135:        size_t           bp;    /* visual right border position */
1.152     kristaps  136:        int              j;     /* temporary loop index for p->buf */
                    137:        int              jhy;   /* last hyph before overflow w/r/t j */
                    138:        size_t           maxvis; /* output position of visible boundary */
                    139:        size_t           mmax; /* used in calculating bp */
1.53      kristaps  140:
1.71      kristaps  141:        /*
                    142:         * First, establish the maximum columns of "visible" content.
                    143:         * This is usually the difference between the right-margin and
                    144:         * an indentation, but can be, for tagged lists or columns, a
1.115     kristaps  145:         * small set of values.
1.71      kristaps  146:         */
1.53      kristaps  147:
1.71      kristaps  148:        assert(p->offset < p->rmargin);
1.92      kristaps  149:
1.129     kristaps  150:        maxvis = (int)(p->rmargin - p->offset) - p->overstep < 0 ?
1.119     kristaps  151:                /* LINTED */
1.129     kristaps  152:                0 : p->rmargin - p->offset - p->overstep;
                    153:        mmax = (int)(p->maxrmargin - p->offset) - p->overstep < 0 ?
1.119     kristaps  154:                /* LINTED */
1.129     kristaps  155:                0 : p->maxrmargin - p->offset - p->overstep;
1.92      kristaps  156:
1.71      kristaps  157:        bp = TERMP_NOBREAK & p->flags ? mmax : maxvis;
1.115     kristaps  158:
1.136     schwarze  159:        /*
                    160:         * Indent the first line of a paragraph.
                    161:         */
                    162:        vbl = p->flags & TERMP_NOLPAD ? 0 : p->offset;
                    163:
1.115     kristaps  164:        /*
                    165:         * FIXME: if bp is zero, we still output the first word before
                    166:         * breaking the line.
                    167:         */
                    168:
1.136     schwarze  169:        vis = vend = i = 0;
                    170:        while (i < (int)p->col) {
1.71      kristaps  171:
                    172:                /*
1.138     schwarze  173:                 * Handle literal tab characters.
                    174:                 */
                    175:                for (j = i; j < (int)p->col; j++) {
                    176:                        if ('\t' != p->buf[j])
                    177:                                break;
                    178:                        vend = (vis/p->tabwidth+1)*p->tabwidth;
                    179:                        vbl += vend - vis;
                    180:                        vis = vend;
                    181:                }
                    182:
                    183:                /*
1.71      kristaps  184:                 * Count up visible word characters.  Control sequences
                    185:                 * (starting with the CSI) aren't counted.  A space
                    186:                 * generates a non-printing word, which is valid (the
                    187:                 * space is printed according to regular spacing rules).
                    188:                 */
                    189:
                    190:                /* LINTED */
1.140     kristaps  191:                for (jhy = 0; j < (int)p->col; j++) {
1.138     schwarze  192:                        if ((j && ' ' == p->buf[j]) || '\t' == p->buf[j])
1.71      kristaps  193:                                break;
1.140     kristaps  194:                        if (8 != p->buf[j]) {
                    195:                                if (vend > vis && vend < bp &&
                    196:                                    ASCII_HYPH == p->buf[j])
                    197:                                        jhy = j;
1.153   ! kristaps  198:                                vend += (*p->width)(p, p->buf[j]);
        !           199:                        } else {
        !           200:                                assert(j);
        !           201:                                vend -= (*p->width)(p, p->buf[j - 1]);
        !           202:                        }
1.71      kristaps  203:                }
1.53      kristaps  204:
1.71      kristaps  205:                /*
1.81      kristaps  206:                 * Find out whether we would exceed the right margin.
1.136     schwarze  207:                 * If so, break to the next line.
1.81      kristaps  208:                 */
1.140     kristaps  209:                if (vend > bp && 0 == jhy && vis > 0) {
1.136     schwarze  210:                        vend -= vis;
1.146     kristaps  211:                        (*p->endline)(p);
1.81      kristaps  212:                        if (TERMP_NOBREAK & p->flags) {
1.139     schwarze  213:                                p->viscol = p->rmargin;
1.146     kristaps  214:                                (*p->advance)(p, p->rmargin);
1.136     schwarze  215:                                vend += p->rmargin - p->offset;
1.81      kristaps  216:                        } else {
1.139     schwarze  217:                                p->viscol = 0;
1.136     schwarze  218:                                vbl = p->offset;
1.81      kristaps  219:                        }
1.130     kristaps  220:
1.129     kristaps  221:                        /* Remove the p->overstep width. */
1.130     kristaps  222:
1.112     kristaps  223:                        bp += (int)/* LINTED */
1.129     kristaps  224:                                p->overstep;
                    225:                        p->overstep = 0;
1.71      kristaps  226:                }
1.53      kristaps  227:
1.138     schwarze  228:                /*
                    229:                 * Skip leading tabs, they were handled above.
                    230:                 */
                    231:                while (i < (int)p->col && '\t' == p->buf[i])
                    232:                        i++;
                    233:
1.130     kristaps  234:                /* Write out the [remaining] word. */
1.136     schwarze  235:                for ( ; i < (int)p->col; i++) {
1.140     kristaps  236:                        if (vend > bp && jhy > 0 && i > jhy)
                    237:                                break;
1.138     schwarze  238:                        if ('\t' == p->buf[i])
                    239:                                break;
1.136     schwarze  240:                        if (' ' == p->buf[i]) {
                    241:                                while (' ' == p->buf[i]) {
1.153   ! kristaps  242:                                        vbl += (*p->width)(p, p->buf[i]);
1.136     schwarze  243:                                        i++;
                    244:                                }
1.71      kristaps  245:                                break;
1.136     schwarze  246:                        }
                    247:                        if (ASCII_NBRSP == p->buf[i]) {
1.153   ! kristaps  248:                                vbl += (*p->width)(p, ' ');
1.136     schwarze  249:                                continue;
                    250:                        }
1.130     kristaps  251:
1.136     schwarze  252:                        /*
                    253:                         * Now we definitely know there will be
                    254:                         * printable characters to output,
                    255:                         * so write preceding white space now.
                    256:                         */
                    257:                        if (vbl) {
1.146     kristaps  258:                                (*p->advance)(p, vbl);
1.139     schwarze  259:                                p->viscol += vbl;
1.136     schwarze  260:                                vbl = 0;
                    261:                        }
1.140     kristaps  262:
1.153   ! kristaps  263:                        if (ASCII_HYPH == p->buf[i]) {
1.146     kristaps  264:                                (*p->letter)(p, '-');
1.153   ! kristaps  265:                                p->viscol += (*p->width)(p, '-');
        !           266:                        } else {
1.146     kristaps  267:                                (*p->letter)(p, p->buf[i]);
1.153   ! kristaps  268:                                p->viscol += (*p->width)(p, p->buf[i]);
        !           269:                        }
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 */
1.153   ! kristaps  287:                        vis - maxvis + (*p->width)(p, ' ');
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 */
1.153   ! kristaps  311:                        ((TERMP_TWOSPACE & p->flags) ? (*p->width)(p, ' ') : 0)) {
1.139     schwarze  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)) {
1.151     schwarze  487:                if ( ! (TERMP_KEEP & p->flags)) {
                    488:                        if (TERMP_PREKEEP & p->flags)
                    489:                                p->flags |= TERMP_KEEP;
1.133     kristaps  490:                        bufferc(p, ' ');
1.151     schwarze  491:                        if (TERMP_SENTENCE & p->flags)
                    492:                                bufferc(p, ' ');
                    493:                } else
                    494:                        bufferc(p, ASCII_NBRSP);
1.133     kristaps  495:        }
1.65      kristaps  496:
1.71      kristaps  497:        if ( ! (p->flags & TERMP_NONOSPACE))
                    498:                p->flags &= ~TERMP_NOSPACE;
1.133     kristaps  499:
                    500:        p->flags &= ~TERMP_SENTENCE;
1.65      kristaps  501:
1.125     kristaps  502:        /* FIXME: use strcspn. */
1.124     kristaps  503:
                    504:        while (*word) {
                    505:                if ('\\' != *word) {
1.125     kristaps  506:                        encode(p, word, 1);
1.124     kristaps  507:                        word++;
                    508:                        continue;
                    509:                }
                    510:
                    511:                seq = ++word;
                    512:                sz = a2roffdeco(&deco, &seq, &ssz);
                    513:
                    514:                switch (deco) {
                    515:                case (DECO_RESERVED):
1.125     kristaps  516:                        res(p, seq, ssz);
1.124     kristaps  517:                        break;
                    518:                case (DECO_SPECIAL):
1.125     kristaps  519:                        spec(p, seq, ssz);
1.124     kristaps  520:                        break;
                    521:                case (DECO_BOLD):
1.125     kristaps  522:                        term_fontrepl(p, TERMFONT_BOLD);
1.124     kristaps  523:                        break;
                    524:                case (DECO_ITALIC):
1.125     kristaps  525:                        term_fontrepl(p, TERMFONT_UNDER);
1.124     kristaps  526:                        break;
                    527:                case (DECO_ROMAN):
1.125     kristaps  528:                        term_fontrepl(p, TERMFONT_NONE);
1.124     kristaps  529:                        break;
                    530:                case (DECO_PREVIOUS):
1.125     kristaps  531:                        term_fontlast(p);
1.124     kristaps  532:                        break;
                    533:                default:
                    534:                        break;
                    535:                }
1.127     kristaps  536:
1.124     kristaps  537:                word += sz;
1.127     kristaps  538:                if (DECO_NOSPACE == deco && '\0' == *word)
                    539:                        p->flags |= TERMP_NOSPACE;
1.124     kristaps  540:        }
1.65      kristaps  541:
1.131     kristaps  542:        /*
                    543:         * Note that we don't process the pipe: the parser sees it as
                    544:         * punctuation, but we don't in terms of typography.
                    545:         */
1.100     kristaps  546:        if (sv[0] && 0 == sv[1])
                    547:                switch (sv[0]) {
                    548:                case('('):
                    549:                        /* FALLTHROUGH */
                    550:                case('['):
                    551:                        p->flags |= TERMP_NOSPACE;
                    552:                        break;
                    553:                default:
                    554:                        break;
                    555:                }
1.65      kristaps  556: }
                    557:
                    558:
1.71      kristaps  559: static void
1.125     kristaps  560: adjbuf(struct termp *p, size_t sz)
1.51      kristaps  561: {
                    562:
1.125     kristaps  563:        if (0 == p->maxcols)
                    564:                p->maxcols = 1024;
                    565:        while (sz >= p->maxcols)
                    566:                p->maxcols <<= 2;
                    567:
                    568:        p->buf = realloc(p->buf, p->maxcols);
                    569:        if (NULL == p->buf) {
                    570:                perror(NULL);
                    571:                exit(EXIT_FAILURE);
1.71      kristaps  572:        }
1.51      kristaps  573: }
                    574:
1.79      kristaps  575:
                    576: static void
1.125     kristaps  577: buffera(struct termp *p, const char *word, size_t sz)
1.79      kristaps  578: {
1.125     kristaps  579:
                    580:        if (p->col + sz >= p->maxcols)
                    581:                adjbuf(p, p->col + sz);
                    582:
1.126     kristaps  583:        memcpy(&p->buf[(int)p->col], word, sz);
1.125     kristaps  584:        p->col += sz;
                    585: }
                    586:
                    587:
                    588: static void
                    589: bufferc(struct termp *p, char c)
                    590: {
                    591:
                    592:        if (p->col + 1 >= p->maxcols)
                    593:                adjbuf(p, p->col + 1);
                    594:
1.126     kristaps  595:        p->buf[(int)p->col++] = c;
1.125     kristaps  596: }
                    597:
                    598:
                    599: static void
                    600: encode(struct termp *p, const char *word, size_t sz)
                    601: {
                    602:        enum termfont     f;
                    603:        int               i;
                    604:
                    605:        /*
                    606:         * Encode and buffer a string of characters.  If the current
                    607:         * font mode is unset, buffer directly, else encode then buffer
                    608:         * character by character.
                    609:         */
                    610:
1.147     kristaps  611:        if (TERMFONT_NONE == (f = term_fonttop(p))) {
1.125     kristaps  612:                buffera(p, word, sz);
                    613:                return;
                    614:        }
                    615:
                    616:        for (i = 0; i < (int)sz; i++) {
                    617:                if ( ! isgraph((u_char)word[i])) {
                    618:                        bufferc(p, word[i]);
                    619:                        continue;
1.79      kristaps  620:                }
1.125     kristaps  621:
                    622:                if (TERMFONT_UNDER == f)
                    623:                        bufferc(p, '_');
                    624:                else
                    625:                        bufferc(p, word[i]);
                    626:
                    627:                bufferc(p, 8);
                    628:                bufferc(p, word[i]);
1.79      kristaps  629:        }
                    630: }
1.106     kristaps  631:
                    632:
1.107     kristaps  633: size_t
1.149     kristaps  634: term_len(const struct termp *p, size_t sz)
                    635: {
                    636:
                    637:        return((*p->width)(p, ' ') * sz);
                    638: }
                    639:
                    640:
                    641: size_t
                    642: term_strlen(const struct termp *p, const char *cp)
                    643: {
                    644:        size_t           sz;
                    645:
                    646:        for (sz = 0; *cp; cp++)
                    647:                sz += (*p->width)(p, *cp);
                    648:
                    649:        return(sz);
                    650: }
                    651:
                    652:
                    653: size_t
                    654: term_vspan(const struct termp *p, const struct roffsu *su)
1.106     kristaps  655: {
                    656:        double           r;
                    657:
1.107     kristaps  658:        switch (su->unit) {
1.106     kristaps  659:        case (SCALE_CM):
1.107     kristaps  660:                r = su->scale * 2;
1.106     kristaps  661:                break;
                    662:        case (SCALE_IN):
1.107     kristaps  663:                r = su->scale * 6;
1.106     kristaps  664:                break;
                    665:        case (SCALE_PC):
1.107     kristaps  666:                r = su->scale;
1.106     kristaps  667:                break;
                    668:        case (SCALE_PT):
1.107     kristaps  669:                r = su->scale / 8;
1.106     kristaps  670:                break;
                    671:        case (SCALE_MM):
1.107     kristaps  672:                r = su->scale / 1000;
1.106     kristaps  673:                break;
                    674:        case (SCALE_VS):
1.107     kristaps  675:                r = su->scale;
1.106     kristaps  676:                break;
                    677:        default:
1.107     kristaps  678:                r = su->scale - 1;
1.106     kristaps  679:                break;
                    680:        }
                    681:
                    682:        if (r < 0.0)
                    683:                r = 0.0;
1.107     kristaps  684:        return(/* LINTED */(size_t)
1.106     kristaps  685:                        r);
                    686: }
                    687:
                    688:
1.107     kristaps  689: size_t
1.149     kristaps  690: term_hspan(const struct termp *p, const struct roffsu *su)
1.106     kristaps  691: {
                    692:        double           r;
                    693:
1.108     kristaps  694:        /* XXX: CM, IN, and PT are approximations. */
                    695:
1.107     kristaps  696:        switch (su->unit) {
1.106     kristaps  697:        case (SCALE_CM):
1.108     kristaps  698:                r = 4 * su->scale;
1.106     kristaps  699:                break;
                    700:        case (SCALE_IN):
1.108     kristaps  701:                /* XXX: this is an approximation. */
                    702:                r = 10 * su->scale;
1.106     kristaps  703:                break;
                    704:        case (SCALE_PC):
1.108     kristaps  705:                r = (10 * su->scale) / 6;
1.106     kristaps  706:                break;
                    707:        case (SCALE_PT):
1.108     kristaps  708:                r = (10 * su->scale) / 72;
1.106     kristaps  709:                break;
                    710:        case (SCALE_MM):
1.107     kristaps  711:                r = su->scale / 1000; /* FIXME: double-check. */
1.106     kristaps  712:                break;
                    713:        case (SCALE_VS):
1.107     kristaps  714:                r = su->scale * 2 - 1; /* FIXME: double-check. */
1.106     kristaps  715:                break;
                    716:        default:
1.107     kristaps  717:                r = su->scale;
1.106     kristaps  718:                break;
                    719:        }
                    720:
                    721:        if (r < 0.0)
                    722:                r = 0.0;
1.107     kristaps  723:        return((size_t)/* LINTED */
1.106     kristaps  724:                        r);
                    725: }
                    726:
                    727:

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