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Annotation of mandoc/mandoc.c, Revision 1.47

1.47    ! kristaps    1: /*     $Id: mandoc.c,v 1.46 2011/04/09 15:35:30 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: /*
                     99:  * Handle an escaped sequeence.  This should be called with any
                    100:  * string subsequent a `\'.  Pass a pointer to this substring as "end";
                    101:  * it will be set to the supremum of the parsed escape sequence.  If
                    102:  * this returns ESCAPE_ERROR, the string is bogus and should be thrown
                    103:  * away.  If not ESCAPE_ERROR or ESCAPE_IGNORE, "start" is set to the
                    104:  * first relevant character of the substring (font, glyph, whatever) of
                    105:  * length sz.  Both "start" and "sz" may be NULL.
                    106:  */
                    107: enum mandoc_esc
                    108: mandoc_escape(const char **end, const char **start, int *sz)
1.1       kristaps  109: {
1.45      kristaps  110:        char             c, term, numeric;
                    111:        int              i, lim, ssz, rlim;
                    112:        const char      *cp, *rstart;
                    113:        enum mandoc_esc  gly;
                    114:
                    115:        cp = *end;
                    116:        rstart = cp;
                    117:        if (start)
                    118:                *start = rstart;
1.46      kristaps  119:        i = lim = 0;
1.45      kristaps  120:        gly = ESCAPE_ERROR;
1.46      kristaps  121:        term = numeric = '\0';
1.18      kristaps  122:
1.45      kristaps  123:        switch ((c = cp[i++])) {
                    124:        /*
                    125:         * First the glyphs.  There are several different forms of
                    126:         * these, but each eventually returns a substring of the glyph
                    127:         * name.
                    128:         */
                    129:        case ('('):
                    130:                gly = ESCAPE_SPECIAL;
                    131:                lim = 2;
                    132:                break;
                    133:        case ('['):
                    134:                gly = ESCAPE_SPECIAL;
                    135:                term = ']';
                    136:                break;
                    137:        case ('C'):
                    138:                if ('\'' != cp[i])
                    139:                        return(ESCAPE_ERROR);
                    140:                gly = ESCAPE_SPECIAL;
                    141:                term = '\'';
                    142:                break;
1.1       kristaps  143:
1.45      kristaps  144:        /*
                    145:         * Handle all triggers matching \X(xy, \Xx, and \X[xxxx], where
                    146:         * 'X' is the trigger.  These have opaque sub-strings.
                    147:         */
                    148:        case ('F'):
                    149:                /* FALLTHROUGH */
                    150:        case ('g'):
1.24      kristaps  151:                /* FALLTHROUGH */
1.45      kristaps  152:        case ('k'):
1.24      kristaps  153:                /* FALLTHROUGH */
1.45      kristaps  154:        case ('M'):
1.24      kristaps  155:                /* FALLTHROUGH */
1.45      kristaps  156:        case ('m'):
1.24      kristaps  157:                /* FALLTHROUGH */
1.45      kristaps  158:        case ('n'):
1.24      kristaps  159:                /* FALLTHROUGH */
1.45      kristaps  160:        case ('V'):
1.24      kristaps  161:                /* FALLTHROUGH */
1.45      kristaps  162:        case ('Y'):
                    163:                if (ESCAPE_ERROR == gly)
                    164:                        gly = ESCAPE_IGNORE;
1.24      kristaps  165:                /* FALLTHROUGH */
1.45      kristaps  166:        case ('*'):
                    167:                if (ESCAPE_ERROR == gly)
                    168:                        gly = ESCAPE_PREDEF;
1.24      kristaps  169:                /* FALLTHROUGH */
1.45      kristaps  170:        case ('f'):
                    171:                if (ESCAPE_ERROR == gly)
                    172:                        gly = ESCAPE_FONT;
                    173:
                    174:                rstart= &cp[i];
                    175:                if (start)
                    176:                        *start = rstart;
                    177:
                    178:                switch (cp[i++]) {
                    179:                case ('('):
                    180:                        lim = 2;
                    181:                        break;
                    182:                case ('['):
                    183:                        term = ']';
                    184:                        break;
                    185:                default:
                    186:                        lim = 1;
                    187:                        i--;
                    188:                        break;
                    189:                }
                    190:                break;
                    191:
                    192:        /*
                    193:         * These escapes are of the form \X'Y', where 'X' is the trigger
                    194:         * and 'Y' is any string.  These have opaque sub-strings.
                    195:         */
                    196:        case ('A'):
1.24      kristaps  197:                /* FALLTHROUGH */
1.45      kristaps  198:        case ('b'):
1.24      kristaps  199:                /* FALLTHROUGH */
                    200:        case ('D'):
                    201:                /* FALLTHROUGH */
1.45      kristaps  202:        case ('o'):
1.24      kristaps  203:                /* FALLTHROUGH */
1.45      kristaps  204:        case ('R'):
1.24      kristaps  205:                /* FALLTHROUGH */
1.45      kristaps  206:        case ('X'):
1.24      kristaps  207:                /* FALLTHROUGH */
1.45      kristaps  208:        case ('Z'):
                    209:                if ('\'' != cp[i++])
                    210:                        return(ESCAPE_ERROR);
                    211:                gly = ESCAPE_IGNORE;
1.24      kristaps  212:                term = '\'';
                    213:                break;
1.45      kristaps  214:
                    215:        /*
                    216:         * These escapes are of the form \X'N', where 'X' is the trigger
                    217:         * and 'N' resolves to a numerical expression.
                    218:         */
                    219:        case ('B'):
                    220:                /* FALLTHROUGH */
1.28      kristaps  221:        case ('h'):
                    222:                /* FALLTHROUGH */
1.45      kristaps  223:        case ('H'):
                    224:                /* FALLTHROUGH */
                    225:        case ('L'):
                    226:                /* FALLTHROUGH */
                    227:        case ('l'):
                    228:                /* FALLTHROUGH */
                    229:        case ('N'):
                    230:                if (ESCAPE_ERROR == gly)
                    231:                        gly = ESCAPE_NUMBERED;
                    232:                /* FALLTHROUGH */
                    233:        case ('S'):
                    234:                /* FALLTHROUGH */
1.28      kristaps  235:        case ('v'):
                    236:                /* FALLTHROUGH */
1.45      kristaps  237:        case ('w'):
                    238:                /* FALLTHROUGH */
                    239:        case ('x'):
                    240:                if (ESCAPE_ERROR == gly)
                    241:                        gly = ESCAPE_IGNORE;
                    242:                if ('\'' != cp[i++])
                    243:                        return(ESCAPE_ERROR);
                    244:                term = numeric = '\'';
                    245:                break;
                    246:
                    247:        /*
                    248:         * Sizes get a special category of their own.
                    249:         */
1.8       kristaps  250:        case ('s'):
1.45      kristaps  251:                gly = ESCAPE_IGNORE;
1.28      kristaps  252:
1.45      kristaps  253:                rstart = &cp[i];
                    254:                if (start)
                    255:                        *start = rstart;
                    256:
                    257:                /* See +/- counts as a sign. */
                    258:                c = cp[i];
                    259:                if ('+' == c || '-' == c || ASCII_HYPH == c)
                    260:                        ++i;
1.8       kristaps  261:
1.45      kristaps  262:                switch (cp[i++]) {
1.22      kristaps  263:                case ('('):
1.45      kristaps  264:                        lim = 2;
1.22      kristaps  265:                        break;
                    266:                case ('['):
1.45      kristaps  267:                        term = numeric = ']';
1.22      kristaps  268:                        break;
                    269:                case ('\''):
1.45      kristaps  270:                        term = numeric = '\'';
1.22      kristaps  271:                        break;
                    272:                default:
1.45      kristaps  273:                        lim = 1;
                    274:                        i--;
1.22      kristaps  275:                        break;
1.8       kristaps  276:                }
                    277:
1.45      kristaps  278:                /* See +/- counts as a sign. */
                    279:                c = cp[i];
                    280:                if ('+' == c || '-' == c || ASCII_HYPH == c)
                    281:                        ++i;
                    282:
                    283:                break;
1.33      kristaps  284:
1.45      kristaps  285:        /*
                    286:         * Anything else is assumed to be a glyph.
                    287:         */
                    288:        default:
                    289:                gly = ESCAPE_SPECIAL;
                    290:                lim = 1;
                    291:                i--;
1.22      kristaps  292:                break;
1.45      kristaps  293:        }
                    294:
                    295:        assert(ESCAPE_ERROR != gly);
                    296:
                    297:        rstart = &cp[i];
                    298:        if (start)
                    299:                *start = rstart;
                    300:
                    301:        /*
                    302:         * If a terminating block has been specified, we need to
                    303:         * handle the case of recursion, which could have their
                    304:         * own terminating blocks that mess up our parse.  This, by the
                    305:         * way, means that the "start" and "size" values will be
                    306:         * effectively meaningless.
                    307:         */
                    308:
                    309:        ssz = 0;
                    310:        if (numeric && -1 == (ssz = numescape(&cp[i])))
                    311:                return(ESCAPE_ERROR);
                    312:
                    313:        i += ssz;
                    314:        rlim = -1;
                    315:
                    316:        /*
                    317:         * We have a character terminator.  Try to read up to that
                    318:         * character.  If we can't (i.e., we hit the nil), then return
                    319:         * an error; if we can, calculate our length, read past the
                    320:         * terminating character, and exit.
                    321:         */
                    322:
                    323:        if ('\0' != term) {
                    324:                *end = strchr(&cp[i], term);
                    325:                if ('\0' == *end)
                    326:                        return(ESCAPE_ERROR);
                    327:
                    328:                rlim = *end - &cp[i];
                    329:                if (sz)
                    330:                        *sz = rlim;
                    331:                (*end)++;
                    332:                goto out;
                    333:        }
                    334:
                    335:        assert(lim > 0);
                    336:
                    337:        /*
                    338:         * We have a numeric limit.  If the string is shorter than that,
                    339:         * stop and return an error.  Else adjust our endpoint, length,
                    340:         * and return the current glyph.
                    341:         */
                    342:
                    343:        if ((size_t)lim > strlen(&cp[i]))
                    344:                return(ESCAPE_ERROR);
                    345:
                    346:        rlim = lim;
                    347:        if (sz)
                    348:                *sz = rlim;
                    349:
                    350:        *end = &cp[i] + lim;
                    351:
                    352: out:
                    353:        assert(rlim >= 0 && rstart);
                    354:
                    355:        /* Run post-processors. */
                    356:
                    357:        switch (gly) {
                    358:        case (ESCAPE_FONT):
                    359:                if (1 != rlim)
                    360:                        break;
                    361:                switch (*rstart) {
                    362:                case ('3'):
                    363:                        /* FALLTHROUGH */
                    364:                case ('B'):
                    365:                        gly = ESCAPE_FONTBOLD;
                    366:                        break;
                    367:                case ('2'):
                    368:                        /* FALLTHROUGH */
                    369:                case ('I'):
                    370:                        gly = ESCAPE_FONTITALIC;
1.22      kristaps  371:                        break;
1.45      kristaps  372:                case ('P'):
                    373:                        gly = ESCAPE_FONTPREV;
1.22      kristaps  374:                        break;
1.45      kristaps  375:                case ('1'):
                    376:                        /* FALLTHROUGH */
                    377:                case ('R'):
                    378:                        gly = ESCAPE_FONTROMAN;
1.1       kristaps  379:                        break;
                    380:                }
1.46      kristaps  381:                break;
1.45      kristaps  382:        case (ESCAPE_SPECIAL):
                    383:                if (1 != rlim)
                    384:                        break;
                    385:                if ('c' == *rstart)
                    386:                        gly = ESCAPE_NOSPACE;
1.22      kristaps  387:                break;
1.1       kristaps  388:        default:
1.22      kristaps  389:                break;
1.1       kristaps  390:        }
                    391:
1.45      kristaps  392:        return(gly);
1.1       kristaps  393: }
1.4       kristaps  394:
                    395: void *
                    396: mandoc_calloc(size_t num, size_t size)
                    397: {
                    398:        void            *ptr;
                    399:
                    400:        ptr = calloc(num, size);
                    401:        if (NULL == ptr) {
1.6       kristaps  402:                perror(NULL);
1.35      kristaps  403:                exit((int)MANDOCLEVEL_SYSERR);
1.4       kristaps  404:        }
                    405:
                    406:        return(ptr);
                    407: }
                    408:
                    409:
                    410: void *
                    411: mandoc_malloc(size_t size)
                    412: {
                    413:        void            *ptr;
                    414:
                    415:        ptr = malloc(size);
                    416:        if (NULL == ptr) {
1.6       kristaps  417:                perror(NULL);
1.35      kristaps  418:                exit((int)MANDOCLEVEL_SYSERR);
1.4       kristaps  419:        }
                    420:
                    421:        return(ptr);
                    422: }
                    423:
                    424:
                    425: void *
                    426: mandoc_realloc(void *ptr, size_t size)
                    427: {
                    428:
                    429:        ptr = realloc(ptr, size);
                    430:        if (NULL == ptr) {
1.6       kristaps  431:                perror(NULL);
1.35      kristaps  432:                exit((int)MANDOCLEVEL_SYSERR);
1.4       kristaps  433:        }
                    434:
                    435:        return(ptr);
                    436: }
                    437:
                    438:
                    439: char *
                    440: mandoc_strdup(const char *ptr)
                    441: {
                    442:        char            *p;
                    443:
                    444:        p = strdup(ptr);
                    445:        if (NULL == p) {
1.6       kristaps  446:                perror(NULL);
1.35      kristaps  447:                exit((int)MANDOCLEVEL_SYSERR);
1.4       kristaps  448:        }
                    449:
                    450:        return(p);
1.36      schwarze  451: }
                    452:
                    453: /*
                    454:  * Parse a quoted or unquoted roff-style request or macro argument.
                    455:  * Return a pointer to the parsed argument, which is either the original
                    456:  * pointer or advanced by one byte in case the argument is quoted.
                    457:  * Null-terminate the argument in place.
                    458:  * Collapse pairs of quotes inside quoted arguments.
                    459:  * Advance the argument pointer to the next argument,
                    460:  * or to the null byte terminating the argument line.
                    461:  */
                    462: char *
1.47    ! kristaps  463: mandoc_getarg(struct mparse *parse,
        !           464:                char **cpp, int ln, int dowarn, int *pos)
1.36      schwarze  465: {
                    466:        char     *start, *cp;
                    467:        int       quoted, pairs, white;
                    468:
                    469:        /* Quoting can only start with a new word. */
                    470:        start = *cpp;
1.47    ! kristaps  471:        quoted = 0;
1.36      schwarze  472:        if ('"' == *start) {
                    473:                quoted = 1;
                    474:                start++;
1.47    ! kristaps  475:        }
1.36      schwarze  476:
                    477:        pairs = 0;
                    478:        white = 0;
                    479:        for (cp = start; '\0' != *cp; cp++) {
                    480:                /* Move left after quoted quotes and escaped backslashes. */
                    481:                if (pairs)
                    482:                        cp[-pairs] = cp[0];
                    483:                if ('\\' == cp[0]) {
                    484:                        if ('\\' == cp[1]) {
                    485:                                /* Poor man's copy mode. */
                    486:                                pairs++;
                    487:                                cp++;
                    488:                        } else if (0 == quoted && ' ' == cp[1])
                    489:                                /* Skip escaped blanks. */
                    490:                                cp++;
                    491:                } else if (0 == quoted) {
                    492:                        if (' ' == cp[0]) {
                    493:                                /* Unescaped blanks end unquoted args. */
                    494:                                white = 1;
                    495:                                break;
                    496:                        }
                    497:                } else if ('"' == cp[0]) {
                    498:                        if ('"' == cp[1]) {
                    499:                                /* Quoted quotes collapse. */
                    500:                                pairs++;
                    501:                                cp++;
                    502:                        } else {
                    503:                                /* Unquoted quotes end quoted args. */
                    504:                                quoted = 2;
                    505:                                break;
                    506:                        }
                    507:                }
                    508:        }
                    509:
                    510:        /* Quoted argument without a closing quote. */
1.47    ! kristaps  511:        if (dowarn && 1 == quoted)
1.42      kristaps  512:                mandoc_msg(MANDOCERR_BADQUOTE, parse, ln, *pos, NULL);
1.36      schwarze  513:
                    514:        /* Null-terminate this argument and move to the next one. */
                    515:        if (pairs)
                    516:                cp[-pairs] = '\0';
                    517:        if ('\0' != *cp) {
                    518:                *cp++ = '\0';
                    519:                while (' ' == *cp)
                    520:                        cp++;
                    521:        }
1.39      kristaps  522:        *pos += (int)(cp - start) + (quoted ? 1 : 0);
1.36      schwarze  523:        *cpp = cp;
                    524:
1.47    ! kristaps  525:        if (dowarn && '\0' == *cp && (white || ' ' == cp[-1]))
1.42      kristaps  526:                mandoc_msg(MANDOCERR_EOLNSPACE, parse, ln, *pos, NULL);
1.36      schwarze  527:
                    528:        return(start);
1.4       kristaps  529: }
1.7       kristaps  530:
                    531: static int
                    532: a2time(time_t *t, const char *fmt, const char *p)
                    533: {
                    534:        struct tm        tm;
                    535:        char            *pp;
                    536:
                    537:        memset(&tm, 0, sizeof(struct tm));
                    538:
                    539:        pp = strptime(p, fmt, &tm);
                    540:        if (NULL != pp && '\0' == *pp) {
                    541:                *t = mktime(&tm);
                    542:                return(1);
                    543:        }
                    544:
                    545:        return(0);
                    546: }
                    547:
1.37      schwarze  548: static char *
                    549: time2a(time_t t)
                    550: {
                    551:        struct tm        tm;
1.38      schwarze  552:        char            *buf, *p;
                    553:        size_t           ssz;
1.37      schwarze  554:        int              isz;
                    555:
                    556:        localtime_r(&t, &tm);
                    557:
1.38      schwarze  558:        /*
                    559:         * Reserve space:
                    560:         * up to 9 characters for the month (September) + blank
                    561:         * up to 2 characters for the day + comma + blank
                    562:         * 4 characters for the year and a terminating '\0'
                    563:         */
                    564:        p = buf = mandoc_malloc(10 + 4 + 4 + 1);
                    565:
                    566:        if (0 == (ssz = strftime(p, 10 + 1, "%B ", &tm)))
                    567:                goto fail;
                    568:        p += (int)ssz;
1.37      schwarze  569:
1.38      schwarze  570:        if (-1 == (isz = snprintf(p, 4 + 1, "%d, ", tm.tm_mday)))
                    571:                goto fail;
1.37      schwarze  572:        p += isz;
                    573:
1.38      schwarze  574:        if (0 == strftime(p, 4 + 1, "%Y", &tm))
                    575:                goto fail;
                    576:        return(buf);
                    577:
                    578: fail:
                    579:        free(buf);
                    580:        return(NULL);
1.37      schwarze  581: }
                    582:
                    583: char *
1.42      kristaps  584: mandoc_normdate(struct mparse *parse, char *in, int ln, int pos)
1.7       kristaps  585: {
1.37      schwarze  586:        char            *out;
1.7       kristaps  587:        time_t           t;
                    588:
1.37      schwarze  589:        if (NULL == in || '\0' == *in ||
                    590:            0 == strcmp(in, "$" "Mdocdate$")) {
1.42      kristaps  591:                mandoc_msg(MANDOCERR_NODATE, parse, ln, pos, NULL);
1.37      schwarze  592:                time(&t);
                    593:        }
                    594:        else if (!a2time(&t, "$" "Mdocdate: %b %d %Y $", in) &&
                    595:            !a2time(&t, "%b %d, %Y", in) &&
                    596:            !a2time(&t, "%Y-%m-%d", in)) {
1.42      kristaps  597:                mandoc_msg(MANDOCERR_BADDATE, parse, ln, pos, NULL);
1.37      schwarze  598:                t = 0;
1.7       kristaps  599:        }
1.37      schwarze  600:        out = t ? time2a(t) : NULL;
1.38      schwarze  601:        return(out ? out : mandoc_strdup(in));
1.7       kristaps  602: }
                    603:
1.12      kristaps  604: int
1.23      schwarze  605: mandoc_eos(const char *p, size_t sz, int enclosed)
1.12      kristaps  606: {
1.23      schwarze  607:        const char *q;
                    608:        int found;
1.12      kristaps  609:
1.13      kristaps  610:        if (0 == sz)
                    611:                return(0);
1.12      kristaps  612:
1.14      kristaps  613:        /*
                    614:         * End-of-sentence recognition must include situations where
                    615:         * some symbols, such as `)', allow prior EOS punctuation to
                    616:         * propogate outward.
                    617:         */
                    618:
1.23      schwarze  619:        found = 0;
1.25      kristaps  620:        for (q = p + (int)sz - 1; q >= p; q--) {
1.23      schwarze  621:                switch (*q) {
1.14      kristaps  622:                case ('\"'):
                    623:                        /* FALLTHROUGH */
                    624:                case ('\''):
1.15      kristaps  625:                        /* FALLTHROUGH */
                    626:                case (']'):
1.14      kristaps  627:                        /* FALLTHROUGH */
                    628:                case (')'):
1.23      schwarze  629:                        if (0 == found)
                    630:                                enclosed = 1;
1.14      kristaps  631:                        break;
                    632:                case ('.'):
                    633:                        /* FALLTHROUGH */
                    634:                case ('!'):
                    635:                        /* FALLTHROUGH */
                    636:                case ('?'):
1.23      schwarze  637:                        found = 1;
                    638:                        break;
1.14      kristaps  639:                default:
1.27      joerg     640:                        return(found && (!enclosed || isalnum((unsigned char)*q)));
1.14      kristaps  641:                }
1.12      kristaps  642:        }
                    643:
1.23      schwarze  644:        return(found && !enclosed);
1.16      kristaps  645: }
                    646:
                    647: int
                    648: mandoc_hyph(const char *start, const char *c)
                    649: {
                    650:
                    651:        /*
                    652:         * Choose whether to break at a hyphenated character.  We only
                    653:         * do this if it's free-standing within a word.
                    654:         */
                    655:
                    656:        /* Skip first/last character of buffer. */
                    657:        if (c == start || '\0' == *(c + 1))
                    658:                return(0);
                    659:        /* Skip first/last character of word. */
                    660:        if ('\t' == *(c + 1) || '\t' == *(c - 1))
                    661:                return(0);
                    662:        if (' ' == *(c + 1) || ' ' == *(c - 1))
                    663:                return(0);
                    664:        /* Skip double invocations. */
                    665:        if ('-' == *(c + 1) || '-' == *(c - 1))
                    666:                return(0);
                    667:        /* Skip escapes. */
                    668:        if ('\\' == *(c - 1))
                    669:                return(0);
                    670:
                    671:        return(1);
1.40      kristaps  672: }
                    673:
1.44      kristaps  674: /*
                    675:  * Find out whether a line is a macro line or not.  If it is, adjust the
                    676:  * current position and return one; if it isn't, return zero and don't
                    677:  * change the current position.
                    678:  */
                    679: int
                    680: mandoc_getcontrol(const char *cp, int *ppos)
                    681: {
                    682:        int             pos;
                    683:
                    684:        pos = *ppos;
                    685:
                    686:        if ('\\' == cp[pos] && '.' == cp[pos + 1])
                    687:                pos += 2;
                    688:        else if ('.' == cp[pos] || '\'' == cp[pos])
                    689:                pos++;
                    690:        else
                    691:                return(0);
                    692:
                    693:        while (' ' == cp[pos] || '\t' == cp[pos])
                    694:                pos++;
                    695:
                    696:        *ppos = pos;
                    697:        return(1);
                    698: }

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