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Annotation of mandoc/mandoc.c, Revision 1.52

1.52    ! kristaps    1: /*     $Id: mandoc.c,v 1.51 2011/05/14 17:54:42 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>
1.50      kristaps   26: #include <errno.h>
                     27: #include <limits.h>
1.1       kristaps   28: #include <stdlib.h>
1.4       kristaps   29: #include <stdio.h>
                     30: #include <string.h>
1.7       kristaps   31: #include <time.h>
1.1       kristaps   32:
1.18      kristaps   33: #include "mandoc.h"
1.1       kristaps   34: #include "libmandoc.h"
                     35:
1.37      schwarze   36: #define DATESIZE 32
                     37:
1.18      kristaps   38: static int      a2time(time_t *, const char *, const char *);
1.37      schwarze   39: static char    *time2a(time_t);
1.45      kristaps   40: static int      numescape(const char *);
1.7       kristaps   41:
1.45      kristaps   42: /*
                     43:  * Pass over recursive numerical expressions.  This context of this
                     44:  * function is important: it's only called within character-terminating
                     45:  * escapes (e.g., \s[xxxyyy]), so all we need to do is handle initial
                     46:  * recursion: we don't care about what's in these blocks.
                     47:  * This returns the number of characters skipped or -1 if an error
                     48:  * occurs (the caller should bail).
                     49:  */
                     50: static int
                     51: numescape(const char *start)
                     52: {
                     53:        int              i;
                     54:        size_t           sz;
                     55:        const char      *cp;
                     56:
                     57:        i = 0;
                     58:
                     59:        /* The expression consists of a subexpression. */
                     60:
                     61:        if ('\\' == start[i]) {
                     62:                cp = &start[++i];
                     63:                /*
                     64:                 * Read past the end of the subexpression.
                     65:                 * Bail immediately on errors.
                     66:                 */
                     67:                if (ESCAPE_ERROR == mandoc_escape(&cp, NULL, NULL))
                     68:                        return(-1);
                     69:                return(i + cp - &start[i]);
                     70:        }
                     71:
                     72:        if ('(' != start[i++])
                     73:                return(0);
                     74:
                     75:        /*
                     76:         * A parenthesised subexpression.  Read until the closing
                     77:         * parenthesis, making sure to handle any nested subexpressions
                     78:         * that might ruin our parse.
                     79:         */
                     80:
                     81:        while (')' != start[i]) {
                     82:                sz = strcspn(&start[i], ")\\");
                     83:                i += (int)sz;
                     84:
                     85:                if ('\0' == start[i])
                     86:                        return(-1);
                     87:                else if ('\\' != start[i])
                     88:                        continue;
                     89:
                     90:                cp = &start[++i];
                     91:                if (ESCAPE_ERROR == mandoc_escape(&cp, NULL, NULL))
                     92:                        return(-1);
                     93:                i += cp - &start[i];
                     94:        }
                     95:
                     96:        /* Read past the terminating ')'. */
                     97:        return(++i);
                     98: }
                     99:
                    100: enum mandoc_esc
                    101: mandoc_escape(const char **end, const char **start, int *sz)
1.1       kristaps  102: {
1.45      kristaps  103:        char             c, term, numeric;
                    104:        int              i, lim, ssz, rlim;
                    105:        const char      *cp, *rstart;
                    106:        enum mandoc_esc  gly;
                    107:
                    108:        cp = *end;
                    109:        rstart = cp;
                    110:        if (start)
                    111:                *start = rstart;
1.46      kristaps  112:        i = lim = 0;
1.45      kristaps  113:        gly = ESCAPE_ERROR;
1.46      kristaps  114:        term = numeric = '\0';
1.18      kristaps  115:
1.45      kristaps  116:        switch ((c = cp[i++])) {
                    117:        /*
                    118:         * First the glyphs.  There are several different forms of
                    119:         * these, but each eventually returns a substring of the glyph
                    120:         * name.
                    121:         */
                    122:        case ('('):
                    123:                gly = ESCAPE_SPECIAL;
                    124:                lim = 2;
                    125:                break;
                    126:        case ('['):
                    127:                gly = ESCAPE_SPECIAL;
1.52    ! kristaps  128:                /*
        !           129:                 * Unicode escapes are defined in groff as \[uXXXX] to
        !           130:                 * \[u10FFFF], where the contained value must be a valid
        !           131:                 * Unicode codepoint.  Here, however, only check whether
        !           132:                 * it's not a zero-width escape.
        !           133:                 */
        !           134:                if ('u' == cp[i] && ']' != cp[i + 1])
        !           135:                        gly = ESCAPE_UNICODE;
1.45      kristaps  136:                term = ']';
                    137:                break;
                    138:        case ('C'):
                    139:                if ('\'' != cp[i])
                    140:                        return(ESCAPE_ERROR);
                    141:                gly = ESCAPE_SPECIAL;
                    142:                term = '\'';
                    143:                break;
1.1       kristaps  144:
1.45      kristaps  145:        /*
                    146:         * Handle all triggers matching \X(xy, \Xx, and \X[xxxx], where
                    147:         * 'X' is the trigger.  These have opaque sub-strings.
                    148:         */
                    149:        case ('F'):
                    150:                /* FALLTHROUGH */
                    151:        case ('g'):
1.24      kristaps  152:                /* FALLTHROUGH */
1.45      kristaps  153:        case ('k'):
1.24      kristaps  154:                /* FALLTHROUGH */
1.45      kristaps  155:        case ('M'):
1.24      kristaps  156:                /* FALLTHROUGH */
1.45      kristaps  157:        case ('m'):
1.24      kristaps  158:                /* FALLTHROUGH */
1.45      kristaps  159:        case ('n'):
1.24      kristaps  160:                /* FALLTHROUGH */
1.45      kristaps  161:        case ('V'):
1.24      kristaps  162:                /* FALLTHROUGH */
1.45      kristaps  163:        case ('Y'):
                    164:                if (ESCAPE_ERROR == gly)
                    165:                        gly = ESCAPE_IGNORE;
1.24      kristaps  166:                /* FALLTHROUGH */
1.45      kristaps  167:        case ('*'):
                    168:                if (ESCAPE_ERROR == gly)
                    169:                        gly = ESCAPE_PREDEF;
1.24      kristaps  170:                /* FALLTHROUGH */
1.45      kristaps  171:        case ('f'):
                    172:                if (ESCAPE_ERROR == gly)
                    173:                        gly = ESCAPE_FONT;
                    174:
                    175:                rstart= &cp[i];
                    176:                if (start)
                    177:                        *start = rstart;
                    178:
                    179:                switch (cp[i++]) {
                    180:                case ('('):
                    181:                        lim = 2;
                    182:                        break;
                    183:                case ('['):
                    184:                        term = ']';
                    185:                        break;
                    186:                default:
                    187:                        lim = 1;
                    188:                        i--;
                    189:                        break;
                    190:                }
                    191:                break;
                    192:
                    193:        /*
                    194:         * These escapes are of the form \X'Y', where 'X' is the trigger
                    195:         * and 'Y' is any string.  These have opaque sub-strings.
                    196:         */
                    197:        case ('A'):
1.24      kristaps  198:                /* FALLTHROUGH */
1.45      kristaps  199:        case ('b'):
1.24      kristaps  200:                /* FALLTHROUGH */
                    201:        case ('D'):
                    202:                /* FALLTHROUGH */
1.45      kristaps  203:        case ('o'):
1.24      kristaps  204:                /* FALLTHROUGH */
1.45      kristaps  205:        case ('R'):
1.24      kristaps  206:                /* FALLTHROUGH */
1.45      kristaps  207:        case ('X'):
1.24      kristaps  208:                /* FALLTHROUGH */
1.45      kristaps  209:        case ('Z'):
                    210:                if ('\'' != cp[i++])
                    211:                        return(ESCAPE_ERROR);
                    212:                gly = ESCAPE_IGNORE;
1.24      kristaps  213:                term = '\'';
                    214:                break;
1.45      kristaps  215:
                    216:        /*
                    217:         * These escapes are of the form \X'N', where 'X' is the trigger
                    218:         * and 'N' resolves to a numerical expression.
                    219:         */
                    220:        case ('B'):
                    221:                /* FALLTHROUGH */
1.28      kristaps  222:        case ('h'):
                    223:                /* FALLTHROUGH */
1.45      kristaps  224:        case ('H'):
                    225:                /* FALLTHROUGH */
                    226:        case ('L'):
                    227:                /* FALLTHROUGH */
                    228:        case ('l'):
                    229:                /* FALLTHROUGH */
                    230:        case ('N'):
                    231:                if (ESCAPE_ERROR == gly)
                    232:                        gly = ESCAPE_NUMBERED;
                    233:                /* FALLTHROUGH */
                    234:        case ('S'):
                    235:                /* FALLTHROUGH */
1.28      kristaps  236:        case ('v'):
                    237:                /* FALLTHROUGH */
1.45      kristaps  238:        case ('w'):
                    239:                /* FALLTHROUGH */
                    240:        case ('x'):
                    241:                if (ESCAPE_ERROR == gly)
                    242:                        gly = ESCAPE_IGNORE;
                    243:                if ('\'' != cp[i++])
                    244:                        return(ESCAPE_ERROR);
                    245:                term = numeric = '\'';
                    246:                break;
                    247:
                    248:        /*
                    249:         * Sizes get a special category of their own.
                    250:         */
1.8       kristaps  251:        case ('s'):
1.45      kristaps  252:                gly = ESCAPE_IGNORE;
1.28      kristaps  253:
1.45      kristaps  254:                rstart = &cp[i];
                    255:                if (start)
                    256:                        *start = rstart;
                    257:
                    258:                /* See +/- counts as a sign. */
                    259:                c = cp[i];
                    260:                if ('+' == c || '-' == c || ASCII_HYPH == c)
                    261:                        ++i;
1.8       kristaps  262:
1.45      kristaps  263:                switch (cp[i++]) {
1.22      kristaps  264:                case ('('):
1.45      kristaps  265:                        lim = 2;
1.22      kristaps  266:                        break;
                    267:                case ('['):
1.45      kristaps  268:                        term = numeric = ']';
1.22      kristaps  269:                        break;
                    270:                case ('\''):
1.45      kristaps  271:                        term = numeric = '\'';
1.22      kristaps  272:                        break;
                    273:                default:
1.45      kristaps  274:                        lim = 1;
                    275:                        i--;
1.22      kristaps  276:                        break;
1.8       kristaps  277:                }
                    278:
1.45      kristaps  279:                /* See +/- counts as a sign. */
                    280:                c = cp[i];
                    281:                if ('+' == c || '-' == c || ASCII_HYPH == c)
                    282:                        ++i;
                    283:
                    284:                break;
1.33      kristaps  285:
1.45      kristaps  286:        /*
                    287:         * Anything else is assumed to be a glyph.
                    288:         */
                    289:        default:
                    290:                gly = ESCAPE_SPECIAL;
                    291:                lim = 1;
                    292:                i--;
1.22      kristaps  293:                break;
1.45      kristaps  294:        }
                    295:
                    296:        assert(ESCAPE_ERROR != gly);
                    297:
                    298:        rstart = &cp[i];
                    299:        if (start)
                    300:                *start = rstart;
                    301:
                    302:        /*
                    303:         * If a terminating block has been specified, we need to
                    304:         * handle the case of recursion, which could have their
                    305:         * own terminating blocks that mess up our parse.  This, by the
                    306:         * way, means that the "start" and "size" values will be
                    307:         * effectively meaningless.
                    308:         */
                    309:
                    310:        ssz = 0;
                    311:        if (numeric && -1 == (ssz = numescape(&cp[i])))
                    312:                return(ESCAPE_ERROR);
                    313:
                    314:        i += ssz;
                    315:        rlim = -1;
                    316:
                    317:        /*
                    318:         * We have a character terminator.  Try to read up to that
                    319:         * character.  If we can't (i.e., we hit the nil), then return
                    320:         * an error; if we can, calculate our length, read past the
                    321:         * terminating character, and exit.
                    322:         */
                    323:
                    324:        if ('\0' != term) {
                    325:                *end = strchr(&cp[i], term);
                    326:                if ('\0' == *end)
                    327:                        return(ESCAPE_ERROR);
                    328:
                    329:                rlim = *end - &cp[i];
                    330:                if (sz)
                    331:                        *sz = rlim;
                    332:                (*end)++;
                    333:                goto out;
                    334:        }
                    335:
                    336:        assert(lim > 0);
                    337:
                    338:        /*
                    339:         * We have a numeric limit.  If the string is shorter than that,
                    340:         * stop and return an error.  Else adjust our endpoint, length,
                    341:         * and return the current glyph.
                    342:         */
                    343:
                    344:        if ((size_t)lim > strlen(&cp[i]))
                    345:                return(ESCAPE_ERROR);
                    346:
                    347:        rlim = lim;
                    348:        if (sz)
                    349:                *sz = rlim;
                    350:
                    351:        *end = &cp[i] + lim;
                    352:
                    353: out:
                    354:        assert(rlim >= 0 && rstart);
                    355:
                    356:        /* Run post-processors. */
                    357:
                    358:        switch (gly) {
                    359:        case (ESCAPE_FONT):
                    360:                if (1 != rlim)
                    361:                        break;
                    362:                switch (*rstart) {
                    363:                case ('3'):
                    364:                        /* FALLTHROUGH */
                    365:                case ('B'):
                    366:                        gly = ESCAPE_FONTBOLD;
                    367:                        break;
                    368:                case ('2'):
                    369:                        /* FALLTHROUGH */
                    370:                case ('I'):
                    371:                        gly = ESCAPE_FONTITALIC;
1.22      kristaps  372:                        break;
1.45      kristaps  373:                case ('P'):
                    374:                        gly = ESCAPE_FONTPREV;
1.22      kristaps  375:                        break;
1.45      kristaps  376:                case ('1'):
                    377:                        /* FALLTHROUGH */
                    378:                case ('R'):
                    379:                        gly = ESCAPE_FONTROMAN;
1.1       kristaps  380:                        break;
                    381:                }
1.46      kristaps  382:                break;
1.45      kristaps  383:        case (ESCAPE_SPECIAL):
                    384:                if (1 != rlim)
                    385:                        break;
                    386:                if ('c' == *rstart)
                    387:                        gly = ESCAPE_NOSPACE;
1.22      kristaps  388:                break;
1.1       kristaps  389:        default:
1.22      kristaps  390:                break;
1.1       kristaps  391:        }
                    392:
1.45      kristaps  393:        return(gly);
1.1       kristaps  394: }
1.4       kristaps  395:
                    396: void *
                    397: mandoc_calloc(size_t num, size_t size)
                    398: {
                    399:        void            *ptr;
                    400:
                    401:        ptr = calloc(num, size);
                    402:        if (NULL == ptr) {
1.6       kristaps  403:                perror(NULL);
1.35      kristaps  404:                exit((int)MANDOCLEVEL_SYSERR);
1.4       kristaps  405:        }
                    406:
                    407:        return(ptr);
                    408: }
                    409:
                    410:
                    411: void *
                    412: mandoc_malloc(size_t size)
                    413: {
                    414:        void            *ptr;
                    415:
                    416:        ptr = malloc(size);
                    417:        if (NULL == ptr) {
1.6       kristaps  418:                perror(NULL);
1.35      kristaps  419:                exit((int)MANDOCLEVEL_SYSERR);
1.4       kristaps  420:        }
                    421:
                    422:        return(ptr);
                    423: }
                    424:
                    425:
                    426: void *
                    427: mandoc_realloc(void *ptr, size_t size)
                    428: {
                    429:
                    430:        ptr = realloc(ptr, size);
                    431:        if (NULL == ptr) {
1.6       kristaps  432:                perror(NULL);
1.35      kristaps  433:                exit((int)MANDOCLEVEL_SYSERR);
1.4       kristaps  434:        }
                    435:
                    436:        return(ptr);
                    437: }
                    438:
                    439:
                    440: char *
                    441: mandoc_strdup(const char *ptr)
                    442: {
                    443:        char            *p;
                    444:
                    445:        p = strdup(ptr);
                    446:        if (NULL == p) {
1.6       kristaps  447:                perror(NULL);
1.35      kristaps  448:                exit((int)MANDOCLEVEL_SYSERR);
1.4       kristaps  449:        }
                    450:
                    451:        return(p);
1.36      schwarze  452: }
                    453:
                    454: /*
                    455:  * Parse a quoted or unquoted roff-style request or macro argument.
                    456:  * Return a pointer to the parsed argument, which is either the original
                    457:  * pointer or advanced by one byte in case the argument is quoted.
                    458:  * Null-terminate the argument in place.
                    459:  * Collapse pairs of quotes inside quoted arguments.
                    460:  * Advance the argument pointer to the next argument,
                    461:  * or to the null byte terminating the argument line.
                    462:  */
                    463: char *
1.48      kristaps  464: mandoc_getarg(struct mparse *parse, char **cpp, int ln, 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. */
1.48      kristaps  511:        if (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:
1.48      kristaps  525:        if ('\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
1.49      kristaps  616:         * propagate outward.
1.14      kristaps  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: }
1.50      kristaps  699:
                    700: /*
                    701:  * Convert a string to a long that may not be <0.
                    702:  * If the string is invalid, or is less than 0, return -1.
                    703:  */
                    704: int
                    705: mandoc_strntou(const char *p, size_t sz, int base)
                    706: {
                    707:        char             buf[32];
                    708:        char            *ep;
                    709:        long             v;
                    710:
                    711:        if (sz > 31)
                    712:                return(-1);
                    713:
                    714:        memcpy(buf, p, sz);
1.51      kristaps  715:        buf[(int)sz] = '\0';
1.50      kristaps  716:
                    717:        errno = 0;
                    718:        v = strtol(buf, &ep, base);
                    719:
                    720:        if (buf[0] == '\0' || *ep != '\0')
                    721:                return(-1);
                    722:
                    723:        if ((errno == ERANGE &&
                    724:                        (v == LONG_MAX || v == LONG_MIN)) ||
                    725:                        (v > INT_MAX || v < 0))
                    726:                return(-1);
                    727:
                    728:        return((int)v);
                    729: }
                    730:

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