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Annotation of mandoc/mandoc.c, Revision 1.48

1.48    ! kristaps    1: /*     $Id: mandoc.c,v 1.47 2011/04/17 09:08:19 kristaps Exp $ */
1.1       kristaps    2: /*
1.22      kristaps    3:  * Copyright (c) 2008, 2009, 2010 Kristaps Dzonsons <kristaps@bsd.lv>
1.36      schwarze    4:  * Copyright (c) 2011 Ingo Schwarze <schwarze@openbsd.org>
1.1       kristaps    5:  *
                      6:  * Permission to use, copy, modify, and distribute this software for any
                      7:  * purpose with or without fee is hereby granted, provided that the above
                      8:  * copyright notice and this permission notice appear in all copies.
                      9:  *
1.36      schwarze   10:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
1.1       kristaps   11:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
1.36      schwarze   12:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
1.1       kristaps   13:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     14:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     15:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     16:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     17:  */
1.9       kristaps   18: #ifdef HAVE_CONFIG_H
                     19: #include "config.h"
1.7       kristaps   20: #endif
                     21:
1.2       kristaps   22: #include <sys/types.h>
                     23:
1.1       kristaps   24: #include <assert.h>
                     25: #include <ctype.h>
                     26: #include <stdlib.h>
1.4       kristaps   27: #include <stdio.h>
                     28: #include <string.h>
1.7       kristaps   29: #include <time.h>
1.1       kristaps   30:
1.18      kristaps   31: #include "mandoc.h"
1.1       kristaps   32: #include "libmandoc.h"
                     33:
1.37      schwarze   34: #define DATESIZE 32
                     35:
1.18      kristaps   36: static int      a2time(time_t *, const char *, const char *);
1.37      schwarze   37: static char    *time2a(time_t);
1.45      kristaps   38: static int      numescape(const char *);
1.7       kristaps   39:
1.45      kristaps   40: /*
                     41:  * Pass over recursive numerical expressions.  This context of this
                     42:  * function is important: it's only called within character-terminating
                     43:  * escapes (e.g., \s[xxxyyy]), so all we need to do is handle initial
                     44:  * recursion: we don't care about what's in these blocks.
                     45:  * This returns the number of characters skipped or -1 if an error
                     46:  * occurs (the caller should bail).
                     47:  */
                     48: static int
                     49: numescape(const char *start)
                     50: {
                     51:        int              i;
                     52:        size_t           sz;
                     53:        const char      *cp;
                     54:
                     55:        i = 0;
                     56:
                     57:        /* The expression consists of a subexpression. */
                     58:
                     59:        if ('\\' == start[i]) {
                     60:                cp = &start[++i];
                     61:                /*
                     62:                 * Read past the end of the subexpression.
                     63:                 * Bail immediately on errors.
                     64:                 */
                     65:                if (ESCAPE_ERROR == mandoc_escape(&cp, NULL, NULL))
                     66:                        return(-1);
                     67:                return(i + cp - &start[i]);
                     68:        }
                     69:
                     70:        if ('(' != start[i++])
                     71:                return(0);
                     72:
                     73:        /*
                     74:         * A parenthesised subexpression.  Read until the closing
                     75:         * parenthesis, making sure to handle any nested subexpressions
                     76:         * that might ruin our parse.
                     77:         */
                     78:
                     79:        while (')' != start[i]) {
                     80:                sz = strcspn(&start[i], ")\\");
                     81:                i += (int)sz;
                     82:
                     83:                if ('\0' == start[i])
                     84:                        return(-1);
                     85:                else if ('\\' != start[i])
                     86:                        continue;
                     87:
                     88:                cp = &start[++i];
                     89:                if (ESCAPE_ERROR == mandoc_escape(&cp, NULL, NULL))
                     90:                        return(-1);
                     91:                i += cp - &start[i];
                     92:        }
                     93:
                     94:        /* Read past the terminating ')'. */
                     95:        return(++i);
                     96: }
                     97:
                     98: enum mandoc_esc
                     99: mandoc_escape(const char **end, const char **start, int *sz)
1.1       kristaps  100: {
1.45      kristaps  101:        char             c, term, numeric;
                    102:        int              i, lim, ssz, rlim;
                    103:        const char      *cp, *rstart;
                    104:        enum mandoc_esc  gly;
                    105:
                    106:        cp = *end;
                    107:        rstart = cp;
                    108:        if (start)
                    109:                *start = rstart;
1.46      kristaps  110:        i = lim = 0;
1.45      kristaps  111:        gly = ESCAPE_ERROR;
1.46      kristaps  112:        term = numeric = '\0';
1.18      kristaps  113:
1.45      kristaps  114:        switch ((c = cp[i++])) {
                    115:        /*
                    116:         * First the glyphs.  There are several different forms of
                    117:         * these, but each eventually returns a substring of the glyph
                    118:         * name.
                    119:         */
                    120:        case ('('):
                    121:                gly = ESCAPE_SPECIAL;
                    122:                lim = 2;
                    123:                break;
                    124:        case ('['):
                    125:                gly = ESCAPE_SPECIAL;
                    126:                term = ']';
                    127:                break;
                    128:        case ('C'):
                    129:                if ('\'' != cp[i])
                    130:                        return(ESCAPE_ERROR);
                    131:                gly = ESCAPE_SPECIAL;
                    132:                term = '\'';
                    133:                break;
1.1       kristaps  134:
1.45      kristaps  135:        /*
                    136:         * Handle all triggers matching \X(xy, \Xx, and \X[xxxx], where
                    137:         * 'X' is the trigger.  These have opaque sub-strings.
                    138:         */
                    139:        case ('F'):
                    140:                /* FALLTHROUGH */
                    141:        case ('g'):
1.24      kristaps  142:                /* FALLTHROUGH */
1.45      kristaps  143:        case ('k'):
1.24      kristaps  144:                /* FALLTHROUGH */
1.45      kristaps  145:        case ('M'):
1.24      kristaps  146:                /* FALLTHROUGH */
1.45      kristaps  147:        case ('m'):
1.24      kristaps  148:                /* FALLTHROUGH */
1.45      kristaps  149:        case ('n'):
1.24      kristaps  150:                /* FALLTHROUGH */
1.45      kristaps  151:        case ('V'):
1.24      kristaps  152:                /* FALLTHROUGH */
1.45      kristaps  153:        case ('Y'):
                    154:                if (ESCAPE_ERROR == gly)
                    155:                        gly = ESCAPE_IGNORE;
1.24      kristaps  156:                /* FALLTHROUGH */
1.45      kristaps  157:        case ('*'):
                    158:                if (ESCAPE_ERROR == gly)
                    159:                        gly = ESCAPE_PREDEF;
1.24      kristaps  160:                /* FALLTHROUGH */
1.45      kristaps  161:        case ('f'):
                    162:                if (ESCAPE_ERROR == gly)
                    163:                        gly = ESCAPE_FONT;
                    164:
                    165:                rstart= &cp[i];
                    166:                if (start)
                    167:                        *start = rstart;
                    168:
                    169:                switch (cp[i++]) {
                    170:                case ('('):
                    171:                        lim = 2;
                    172:                        break;
                    173:                case ('['):
                    174:                        term = ']';
                    175:                        break;
                    176:                default:
                    177:                        lim = 1;
                    178:                        i--;
                    179:                        break;
                    180:                }
                    181:                break;
                    182:
                    183:        /*
                    184:         * These escapes are of the form \X'Y', where 'X' is the trigger
                    185:         * and 'Y' is any string.  These have opaque sub-strings.
                    186:         */
                    187:        case ('A'):
1.24      kristaps  188:                /* FALLTHROUGH */
1.45      kristaps  189:        case ('b'):
1.24      kristaps  190:                /* FALLTHROUGH */
                    191:        case ('D'):
                    192:                /* FALLTHROUGH */
1.45      kristaps  193:        case ('o'):
1.24      kristaps  194:                /* FALLTHROUGH */
1.45      kristaps  195:        case ('R'):
1.24      kristaps  196:                /* FALLTHROUGH */
1.45      kristaps  197:        case ('X'):
1.24      kristaps  198:                /* FALLTHROUGH */
1.45      kristaps  199:        case ('Z'):
                    200:                if ('\'' != cp[i++])
                    201:                        return(ESCAPE_ERROR);
                    202:                gly = ESCAPE_IGNORE;
1.24      kristaps  203:                term = '\'';
                    204:                break;
1.45      kristaps  205:
                    206:        /*
                    207:         * These escapes are of the form \X'N', where 'X' is the trigger
                    208:         * and 'N' resolves to a numerical expression.
                    209:         */
                    210:        case ('B'):
                    211:                /* FALLTHROUGH */
1.28      kristaps  212:        case ('h'):
                    213:                /* FALLTHROUGH */
1.45      kristaps  214:        case ('H'):
                    215:                /* FALLTHROUGH */
                    216:        case ('L'):
                    217:                /* FALLTHROUGH */
                    218:        case ('l'):
                    219:                /* FALLTHROUGH */
                    220:        case ('N'):
                    221:                if (ESCAPE_ERROR == gly)
                    222:                        gly = ESCAPE_NUMBERED;
                    223:                /* FALLTHROUGH */
                    224:        case ('S'):
                    225:                /* FALLTHROUGH */
1.28      kristaps  226:        case ('v'):
                    227:                /* FALLTHROUGH */
1.45      kristaps  228:        case ('w'):
                    229:                /* FALLTHROUGH */
                    230:        case ('x'):
                    231:                if (ESCAPE_ERROR == gly)
                    232:                        gly = ESCAPE_IGNORE;
                    233:                if ('\'' != cp[i++])
                    234:                        return(ESCAPE_ERROR);
                    235:                term = numeric = '\'';
                    236:                break;
                    237:
                    238:        /*
                    239:         * Sizes get a special category of their own.
                    240:         */
1.8       kristaps  241:        case ('s'):
1.45      kristaps  242:                gly = ESCAPE_IGNORE;
1.28      kristaps  243:
1.45      kristaps  244:                rstart = &cp[i];
                    245:                if (start)
                    246:                        *start = rstart;
                    247:
                    248:                /* See +/- counts as a sign. */
                    249:                c = cp[i];
                    250:                if ('+' == c || '-' == c || ASCII_HYPH == c)
                    251:                        ++i;
1.8       kristaps  252:
1.45      kristaps  253:                switch (cp[i++]) {
1.22      kristaps  254:                case ('('):
1.45      kristaps  255:                        lim = 2;
1.22      kristaps  256:                        break;
                    257:                case ('['):
1.45      kristaps  258:                        term = numeric = ']';
1.22      kristaps  259:                        break;
                    260:                case ('\''):
1.45      kristaps  261:                        term = numeric = '\'';
1.22      kristaps  262:                        break;
                    263:                default:
1.45      kristaps  264:                        lim = 1;
                    265:                        i--;
1.22      kristaps  266:                        break;
1.8       kristaps  267:                }
                    268:
1.45      kristaps  269:                /* See +/- counts as a sign. */
                    270:                c = cp[i];
                    271:                if ('+' == c || '-' == c || ASCII_HYPH == c)
                    272:                        ++i;
                    273:
                    274:                break;
1.33      kristaps  275:
1.45      kristaps  276:        /*
                    277:         * Anything else is assumed to be a glyph.
                    278:         */
                    279:        default:
                    280:                gly = ESCAPE_SPECIAL;
                    281:                lim = 1;
                    282:                i--;
1.22      kristaps  283:                break;
1.45      kristaps  284:        }
                    285:
                    286:        assert(ESCAPE_ERROR != gly);
                    287:
                    288:        rstart = &cp[i];
                    289:        if (start)
                    290:                *start = rstart;
                    291:
                    292:        /*
                    293:         * If a terminating block has been specified, we need to
                    294:         * handle the case of recursion, which could have their
                    295:         * own terminating blocks that mess up our parse.  This, by the
                    296:         * way, means that the "start" and "size" values will be
                    297:         * effectively meaningless.
                    298:         */
                    299:
                    300:        ssz = 0;
                    301:        if (numeric && -1 == (ssz = numescape(&cp[i])))
                    302:                return(ESCAPE_ERROR);
                    303:
                    304:        i += ssz;
                    305:        rlim = -1;
                    306:
                    307:        /*
                    308:         * We have a character terminator.  Try to read up to that
                    309:         * character.  If we can't (i.e., we hit the nil), then return
                    310:         * an error; if we can, calculate our length, read past the
                    311:         * terminating character, and exit.
                    312:         */
                    313:
                    314:        if ('\0' != term) {
                    315:                *end = strchr(&cp[i], term);
                    316:                if ('\0' == *end)
                    317:                        return(ESCAPE_ERROR);
                    318:
                    319:                rlim = *end - &cp[i];
                    320:                if (sz)
                    321:                        *sz = rlim;
                    322:                (*end)++;
                    323:                goto out;
                    324:        }
                    325:
                    326:        assert(lim > 0);
                    327:
                    328:        /*
                    329:         * We have a numeric limit.  If the string is shorter than that,
                    330:         * stop and return an error.  Else adjust our endpoint, length,
                    331:         * and return the current glyph.
                    332:         */
                    333:
                    334:        if ((size_t)lim > strlen(&cp[i]))
                    335:                return(ESCAPE_ERROR);
                    336:
                    337:        rlim = lim;
                    338:        if (sz)
                    339:                *sz = rlim;
                    340:
                    341:        *end = &cp[i] + lim;
                    342:
                    343: out:
                    344:        assert(rlim >= 0 && rstart);
                    345:
                    346:        /* Run post-processors. */
                    347:
                    348:        switch (gly) {
                    349:        case (ESCAPE_FONT):
                    350:                if (1 != rlim)
                    351:                        break;
                    352:                switch (*rstart) {
                    353:                case ('3'):
                    354:                        /* FALLTHROUGH */
                    355:                case ('B'):
                    356:                        gly = ESCAPE_FONTBOLD;
                    357:                        break;
                    358:                case ('2'):
                    359:                        /* FALLTHROUGH */
                    360:                case ('I'):
                    361:                        gly = ESCAPE_FONTITALIC;
1.22      kristaps  362:                        break;
1.45      kristaps  363:                case ('P'):
                    364:                        gly = ESCAPE_FONTPREV;
1.22      kristaps  365:                        break;
1.45      kristaps  366:                case ('1'):
                    367:                        /* FALLTHROUGH */
                    368:                case ('R'):
                    369:                        gly = ESCAPE_FONTROMAN;
1.1       kristaps  370:                        break;
                    371:                }
1.46      kristaps  372:                break;
1.45      kristaps  373:        case (ESCAPE_SPECIAL):
                    374:                if (1 != rlim)
                    375:                        break;
                    376:                if ('c' == *rstart)
                    377:                        gly = ESCAPE_NOSPACE;
1.22      kristaps  378:                break;
1.1       kristaps  379:        default:
1.22      kristaps  380:                break;
1.1       kristaps  381:        }
                    382:
1.45      kristaps  383:        return(gly);
1.1       kristaps  384: }
1.4       kristaps  385:
                    386: void *
                    387: mandoc_calloc(size_t num, size_t size)
                    388: {
                    389:        void            *ptr;
                    390:
                    391:        ptr = calloc(num, size);
                    392:        if (NULL == ptr) {
1.6       kristaps  393:                perror(NULL);
1.35      kristaps  394:                exit((int)MANDOCLEVEL_SYSERR);
1.4       kristaps  395:        }
                    396:
                    397:        return(ptr);
                    398: }
                    399:
                    400:
                    401: void *
                    402: mandoc_malloc(size_t size)
                    403: {
                    404:        void            *ptr;
                    405:
                    406:        ptr = malloc(size);
                    407:        if (NULL == ptr) {
1.6       kristaps  408:                perror(NULL);
1.35      kristaps  409:                exit((int)MANDOCLEVEL_SYSERR);
1.4       kristaps  410:        }
                    411:
                    412:        return(ptr);
                    413: }
                    414:
                    415:
                    416: void *
                    417: mandoc_realloc(void *ptr, size_t size)
                    418: {
                    419:
                    420:        ptr = realloc(ptr, size);
                    421:        if (NULL == ptr) {
1.6       kristaps  422:                perror(NULL);
1.35      kristaps  423:                exit((int)MANDOCLEVEL_SYSERR);
1.4       kristaps  424:        }
                    425:
                    426:        return(ptr);
                    427: }
                    428:
                    429:
                    430: char *
                    431: mandoc_strdup(const char *ptr)
                    432: {
                    433:        char            *p;
                    434:
                    435:        p = strdup(ptr);
                    436:        if (NULL == p) {
1.6       kristaps  437:                perror(NULL);
1.35      kristaps  438:                exit((int)MANDOCLEVEL_SYSERR);
1.4       kristaps  439:        }
                    440:
                    441:        return(p);
1.36      schwarze  442: }
                    443:
                    444: /*
                    445:  * Parse a quoted or unquoted roff-style request or macro argument.
                    446:  * Return a pointer to the parsed argument, which is either the original
                    447:  * pointer or advanced by one byte in case the argument is quoted.
                    448:  * Null-terminate the argument in place.
                    449:  * Collapse pairs of quotes inside quoted arguments.
                    450:  * Advance the argument pointer to the next argument,
                    451:  * or to the null byte terminating the argument line.
                    452:  */
                    453: char *
1.48    ! kristaps  454: mandoc_getarg(struct mparse *parse, char **cpp, int ln, int *pos)
1.36      schwarze  455: {
                    456:        char     *start, *cp;
                    457:        int       quoted, pairs, white;
                    458:
                    459:        /* Quoting can only start with a new word. */
                    460:        start = *cpp;
1.47      kristaps  461:        quoted = 0;
1.36      schwarze  462:        if ('"' == *start) {
                    463:                quoted = 1;
                    464:                start++;
1.47      kristaps  465:        }
1.36      schwarze  466:
                    467:        pairs = 0;
                    468:        white = 0;
                    469:        for (cp = start; '\0' != *cp; cp++) {
                    470:                /* Move left after quoted quotes and escaped backslashes. */
                    471:                if (pairs)
                    472:                        cp[-pairs] = cp[0];
                    473:                if ('\\' == cp[0]) {
                    474:                        if ('\\' == cp[1]) {
                    475:                                /* Poor man's copy mode. */
                    476:                                pairs++;
                    477:                                cp++;
                    478:                        } else if (0 == quoted && ' ' == cp[1])
                    479:                                /* Skip escaped blanks. */
                    480:                                cp++;
                    481:                } else if (0 == quoted) {
                    482:                        if (' ' == cp[0]) {
                    483:                                /* Unescaped blanks end unquoted args. */
                    484:                                white = 1;
                    485:                                break;
                    486:                        }
                    487:                } else if ('"' == cp[0]) {
                    488:                        if ('"' == cp[1]) {
                    489:                                /* Quoted quotes collapse. */
                    490:                                pairs++;
                    491:                                cp++;
                    492:                        } else {
                    493:                                /* Unquoted quotes end quoted args. */
                    494:                                quoted = 2;
                    495:                                break;
                    496:                        }
                    497:                }
                    498:        }
                    499:
                    500:        /* Quoted argument without a closing quote. */
1.48    ! kristaps  501:        if (1 == quoted)
1.42      kristaps  502:                mandoc_msg(MANDOCERR_BADQUOTE, parse, ln, *pos, NULL);
1.36      schwarze  503:
                    504:        /* Null-terminate this argument and move to the next one. */
                    505:        if (pairs)
                    506:                cp[-pairs] = '\0';
                    507:        if ('\0' != *cp) {
                    508:                *cp++ = '\0';
                    509:                while (' ' == *cp)
                    510:                        cp++;
                    511:        }
1.39      kristaps  512:        *pos += (int)(cp - start) + (quoted ? 1 : 0);
1.36      schwarze  513:        *cpp = cp;
                    514:
1.48    ! kristaps  515:        if ('\0' == *cp && (white || ' ' == cp[-1]))
1.42      kristaps  516:                mandoc_msg(MANDOCERR_EOLNSPACE, parse, ln, *pos, NULL);
1.36      schwarze  517:
                    518:        return(start);
1.4       kristaps  519: }
1.7       kristaps  520:
                    521: static int
                    522: a2time(time_t *t, const char *fmt, const char *p)
                    523: {
                    524:        struct tm        tm;
                    525:        char            *pp;
                    526:
                    527:        memset(&tm, 0, sizeof(struct tm));
                    528:
                    529:        pp = strptime(p, fmt, &tm);
                    530:        if (NULL != pp && '\0' == *pp) {
                    531:                *t = mktime(&tm);
                    532:                return(1);
                    533:        }
                    534:
                    535:        return(0);
                    536: }
                    537:
1.37      schwarze  538: static char *
                    539: time2a(time_t t)
                    540: {
                    541:        struct tm        tm;
1.38      schwarze  542:        char            *buf, *p;
                    543:        size_t           ssz;
1.37      schwarze  544:        int              isz;
                    545:
                    546:        localtime_r(&t, &tm);
                    547:
1.38      schwarze  548:        /*
                    549:         * Reserve space:
                    550:         * up to 9 characters for the month (September) + blank
                    551:         * up to 2 characters for the day + comma + blank
                    552:         * 4 characters for the year and a terminating '\0'
                    553:         */
                    554:        p = buf = mandoc_malloc(10 + 4 + 4 + 1);
                    555:
                    556:        if (0 == (ssz = strftime(p, 10 + 1, "%B ", &tm)))
                    557:                goto fail;
                    558:        p += (int)ssz;
1.37      schwarze  559:
1.38      schwarze  560:        if (-1 == (isz = snprintf(p, 4 + 1, "%d, ", tm.tm_mday)))
                    561:                goto fail;
1.37      schwarze  562:        p += isz;
                    563:
1.38      schwarze  564:        if (0 == strftime(p, 4 + 1, "%Y", &tm))
                    565:                goto fail;
                    566:        return(buf);
                    567:
                    568: fail:
                    569:        free(buf);
                    570:        return(NULL);
1.37      schwarze  571: }
                    572:
                    573: char *
1.42      kristaps  574: mandoc_normdate(struct mparse *parse, char *in, int ln, int pos)
1.7       kristaps  575: {
1.37      schwarze  576:        char            *out;
1.7       kristaps  577:        time_t           t;
                    578:
1.37      schwarze  579:        if (NULL == in || '\0' == *in ||
                    580:            0 == strcmp(in, "$" "Mdocdate$")) {
1.42      kristaps  581:                mandoc_msg(MANDOCERR_NODATE, parse, ln, pos, NULL);
1.37      schwarze  582:                time(&t);
                    583:        }
                    584:        else if (!a2time(&t, "$" "Mdocdate: %b %d %Y $", in) &&
                    585:            !a2time(&t, "%b %d, %Y", in) &&
                    586:            !a2time(&t, "%Y-%m-%d", in)) {
1.42      kristaps  587:                mandoc_msg(MANDOCERR_BADDATE, parse, ln, pos, NULL);
1.37      schwarze  588:                t = 0;
1.7       kristaps  589:        }
1.37      schwarze  590:        out = t ? time2a(t) : NULL;
1.38      schwarze  591:        return(out ? out : mandoc_strdup(in));
1.7       kristaps  592: }
                    593:
1.12      kristaps  594: int
1.23      schwarze  595: mandoc_eos(const char *p, size_t sz, int enclosed)
1.12      kristaps  596: {
1.23      schwarze  597:        const char *q;
                    598:        int found;
1.12      kristaps  599:
1.13      kristaps  600:        if (0 == sz)
                    601:                return(0);
1.12      kristaps  602:
1.14      kristaps  603:        /*
                    604:         * End-of-sentence recognition must include situations where
                    605:         * some symbols, such as `)', allow prior EOS punctuation to
                    606:         * propogate outward.
                    607:         */
                    608:
1.23      schwarze  609:        found = 0;
1.25      kristaps  610:        for (q = p + (int)sz - 1; q >= p; q--) {
1.23      schwarze  611:                switch (*q) {
1.14      kristaps  612:                case ('\"'):
                    613:                        /* FALLTHROUGH */
                    614:                case ('\''):
1.15      kristaps  615:                        /* FALLTHROUGH */
                    616:                case (']'):
1.14      kristaps  617:                        /* FALLTHROUGH */
                    618:                case (')'):
1.23      schwarze  619:                        if (0 == found)
                    620:                                enclosed = 1;
1.14      kristaps  621:                        break;
                    622:                case ('.'):
                    623:                        /* FALLTHROUGH */
                    624:                case ('!'):
                    625:                        /* FALLTHROUGH */
                    626:                case ('?'):
1.23      schwarze  627:                        found = 1;
                    628:                        break;
1.14      kristaps  629:                default:
1.27      joerg     630:                        return(found && (!enclosed || isalnum((unsigned char)*q)));
1.14      kristaps  631:                }
1.12      kristaps  632:        }
                    633:
1.23      schwarze  634:        return(found && !enclosed);
1.16      kristaps  635: }
                    636:
                    637: int
                    638: mandoc_hyph(const char *start, const char *c)
                    639: {
                    640:
                    641:        /*
                    642:         * Choose whether to break at a hyphenated character.  We only
                    643:         * do this if it's free-standing within a word.
                    644:         */
                    645:
                    646:        /* Skip first/last character of buffer. */
                    647:        if (c == start || '\0' == *(c + 1))
                    648:                return(0);
                    649:        /* Skip first/last character of word. */
                    650:        if ('\t' == *(c + 1) || '\t' == *(c - 1))
                    651:                return(0);
                    652:        if (' ' == *(c + 1) || ' ' == *(c - 1))
                    653:                return(0);
                    654:        /* Skip double invocations. */
                    655:        if ('-' == *(c + 1) || '-' == *(c - 1))
                    656:                return(0);
                    657:        /* Skip escapes. */
                    658:        if ('\\' == *(c - 1))
                    659:                return(0);
                    660:
                    661:        return(1);
1.40      kristaps  662: }
                    663:
1.44      kristaps  664: /*
                    665:  * Find out whether a line is a macro line or not.  If it is, adjust the
                    666:  * current position and return one; if it isn't, return zero and don't
                    667:  * change the current position.
                    668:  */
                    669: int
                    670: mandoc_getcontrol(const char *cp, int *ppos)
                    671: {
                    672:        int             pos;
                    673:
                    674:        pos = *ppos;
                    675:
                    676:        if ('\\' == cp[pos] && '.' == cp[pos + 1])
                    677:                pos += 2;
                    678:        else if ('.' == cp[pos] || '\'' == cp[pos])
                    679:                pos++;
                    680:        else
                    681:                return(0);
                    682:
                    683:        while (' ' == cp[pos] || '\t' == cp[pos])
                    684:                pos++;
                    685:
                    686:        *ppos = pos;
                    687:        return(1);
                    688: }

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