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Annotation of src/lib/libc/gen/glob.c, Revision 1.1

1.1     ! cgd         1: /*
        !             2:  * Copyright (c) 1989 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * Guido van Rossum.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. All advertising materials mentioning features or use of this software
        !            17:  *    must display the following acknowledgement:
        !            18:  *     This product includes software developed by the University of
        !            19:  *     California, Berkeley and its contributors.
        !            20:  * 4. Neither the name of the University nor the names of its contributors
        !            21:  *    may be used to endorse or promote products derived from this software
        !            22:  *    without specific prior written permission.
        !            23:  *
        !            24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            34:  * SUCH DAMAGE.
        !            35:  */
        !            36:
        !            37: #if defined(LIBC_SCCS) && !defined(lint)
        !            38: static char sccsid[] = "@(#)glob.c     5.12 (Berkeley) 6/24/91";
        !            39: #endif /* LIBC_SCCS and not lint */
        !            40:
        !            41: /*
        !            42:  * glob(3) -- a superset of the one defined in POSIX 1003.2.
        !            43:  *
        !            44:  * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
        !            45:  *
        !            46:  * Optional extra services, controlled by flags not defined by POSIX:
        !            47:  *
        !            48:  * GLOB_QUOTE:
        !            49:  *     Escaping convention: \ inhibits any special meaning the following
        !            50:  *     character might have (except \ at end of string is retained).
        !            51:  * GLOB_MAGCHAR:
        !            52:  *     Set in gl_flags if pattern contained a globbing character.
        !            53:  * gl_matchc:
        !            54:  *     Number of matches in the current invocation of glob.
        !            55:  */
        !            56:
        !            57: #include <sys/cdefs.h>
        !            58: #include <sys/param.h>
        !            59: #include <sys/stat.h>
        !            60: #include <dirent.h>
        !            61: #include <glob.h>
        !            62: #include <ctype.h>
        !            63: #include <errno.h>
        !            64: #include <string.h>
        !            65: #include <stdio.h>
        !            66: #include <stdlib.h>
        !            67:
        !            68: #define        DOLLAR          '$'
        !            69: #define        DOT             '.'
        !            70: #define        EOS             '\0'
        !            71: #define        LBRACKET        '['
        !            72: #define        NOT             '!'
        !            73: #define        QUESTION        '?'
        !            74: #define        QUOTE           '\\'
        !            75: #define        RANGE           '-'
        !            76: #define        RBRACKET        ']'
        !            77: #define        SEP             '/'
        !            78: #define        STAR            '*'
        !            79: #define        TILDE           '~'
        !            80: #define        UNDERSCORE      '_'
        !            81:
        !            82: #define        M_QUOTE         0x8000
        !            83: #define        M_PROTECT       0x4000
        !            84: #define        M_MASK          0xffff
        !            85: #define        M_ASCII         0x00ff
        !            86:
        !            87: #define        CHAR(c)         ((c)&M_ASCII)
        !            88: #define        META(c)         ((c)|M_QUOTE)
        !            89: #define        M_ALL           META('*')
        !            90: #define        M_END           META(']')
        !            91: #define        M_NOT           META('!')
        !            92: #define        M_ONE           META('?')
        !            93: #define        M_RNG           META('-')
        !            94: #define        M_SET           META('[')
        !            95: #define        ismeta(c)       (((c)&M_QUOTE) != 0)
        !            96:
        !            97: typedef u_short Char;
        !            98:
        !            99: static int      compare __P((const void *, const void *));
        !           100: static void     g_Ctoc __P((Char *, char *));
        !           101: static int      g_lstat __P((Char *, struct stat *));
        !           102: static DIR     *g_opendir __P((Char *));
        !           103: static Char    *g_strchr __P((Char *, int));
        !           104: static int      g_stat __P((Char *, struct stat *));
        !           105: static int      glob1 __P((Char *, glob_t *));
        !           106: static int      glob2 __P((Char *, Char *, Char *, glob_t *));
        !           107: static int      glob3 __P((Char *, Char *, Char *, Char *, glob_t *));
        !           108: static int      globextend __P((Char *, glob_t *));
        !           109: static int      match __P((Char *, Char *, Char *));
        !           110: #ifdef DEBUG
        !           111: static void     qprintf __P((Char *));
        !           112: #endif
        !           113:
        !           114: /*
        !           115:  * The main glob() routine: compiles the pattern (optionally processing
        !           116:  * quotes), calls glob1() to do the real pattern matching, and finally
        !           117:  * sorts the list (unless unsorted operation is requested).  Returns 0
        !           118:  * if things went well, nonzero if errors occurred.  It is not an error
        !           119:  * to find no matches.
        !           120:  */
        !           121: glob(pattern, flags, errfunc, pglob)
        !           122:        const char *pattern;
        !           123:        int flags, (*errfunc) __P((char *, int));
        !           124:        glob_t *pglob;
        !           125: {
        !           126:        const u_char *compilepat, *patnext;
        !           127:        int c, err, oldpathc;
        !           128:        Char *bufnext, *bufend, *compilebuf, *qpatnext, patbuf[MAXPATHLEN+1];
        !           129:
        !           130:        patnext = (u_char *) pattern;
        !           131:        if (!(flags & GLOB_APPEND)) {
        !           132:                pglob->gl_pathc = 0;
        !           133:                pglob->gl_pathv = NULL;
        !           134:                if (!(flags & GLOB_DOOFFS))
        !           135:                        pglob->gl_offs = 0;
        !           136:        }
        !           137:        pglob->gl_flags = flags & ~GLOB_MAGCHAR;
        !           138:        pglob->gl_errfunc = errfunc;
        !           139:        oldpathc = pglob->gl_pathc;
        !           140:        pglob->gl_matchc = 0;
        !           141:
        !           142:        bufnext = patbuf;
        !           143:        bufend = bufnext + MAXPATHLEN;
        !           144:        compilebuf = bufnext;
        !           145:        compilepat = patnext;
        !           146:        if (flags & GLOB_QUOTE) {
        !           147:                /* Protect the quoted characters. */
        !           148:                while (bufnext < bufend && (c = *patnext++) != EOS)
        !           149:                        if (c == QUOTE) {
        !           150:                                if ((c = *patnext++) == EOS) {
        !           151:                                        c = QUOTE;
        !           152:                                        --patnext;
        !           153:                                }
        !           154:                                *bufnext++ = c | M_PROTECT;
        !           155:                        }
        !           156:                        else
        !           157:                                *bufnext++ = c;
        !           158:        }
        !           159:        else
        !           160:            while (bufnext < bufend && (c = *patnext++) != EOS)
        !           161:                    *bufnext++ = c;
        !           162:        *bufnext = EOS;
        !           163:
        !           164:        bufnext = patbuf;
        !           165:        qpatnext = patbuf;
        !           166:        /* We don't need to check for buffer overflow any more. */
        !           167:        while ((c = *qpatnext++) != EOS) {
        !           168:                switch (c) {
        !           169:                case LBRACKET:
        !           170:                        pglob->gl_flags |= GLOB_MAGCHAR;
        !           171:                        c = *qpatnext;
        !           172:                        if (c == NOT)
        !           173:                                ++qpatnext;
        !           174:                        if (*qpatnext == EOS ||
        !           175:                            g_strchr(qpatnext+1, RBRACKET) == NULL) {
        !           176:                                *bufnext++ = LBRACKET;
        !           177:                                if (c == NOT)
        !           178:                                        --qpatnext;
        !           179:                                break;
        !           180:                        }
        !           181:                        *bufnext++ = M_SET;
        !           182:                        if (c == NOT)
        !           183:                                *bufnext++ = M_NOT;
        !           184:                        c = *qpatnext++;
        !           185:                        do {
        !           186:                                *bufnext++ = CHAR(c);
        !           187:                                if (*qpatnext == RANGE &&
        !           188:                                    (c = qpatnext[1]) != RBRACKET) {
        !           189:                                        *bufnext++ = M_RNG;
        !           190:                                        *bufnext++ = CHAR(c);
        !           191:                                        qpatnext += 2;
        !           192:                                }
        !           193:                        } while ((c = *qpatnext++) != RBRACKET);
        !           194:                        *bufnext++ = M_END;
        !           195:                        break;
        !           196:                case QUESTION:
        !           197:                        pglob->gl_flags |= GLOB_MAGCHAR;
        !           198:                        *bufnext++ = M_ONE;
        !           199:                        break;
        !           200:                case STAR:
        !           201:                        pglob->gl_flags |= GLOB_MAGCHAR;
        !           202:                        *bufnext++ = M_ALL;
        !           203:                        break;
        !           204:                default:
        !           205:                        *bufnext++ = CHAR(c);
        !           206:                        break;
        !           207:                }
        !           208:        }
        !           209:        *bufnext = EOS;
        !           210: #ifdef DEBUG
        !           211:        qprintf(patbuf);
        !           212: #endif
        !           213:
        !           214:        if ((err = glob1(patbuf, pglob)) != 0)
        !           215:                return(err);
        !           216:
        !           217:        if (pglob->gl_pathc == oldpathc && flags & GLOB_NOCHECK) {
        !           218:                if (!(flags & GLOB_QUOTE)) {
        !           219:                        Char *dp = compilebuf;
        !           220:                        const u_char *sp = compilepat;
        !           221:                        while (*dp++ = *sp++);
        !           222:                }
        !           223:                else {
        !           224:                        /*
        !           225:                         * Copy pattern, interpreting quotes; this is slightly
        !           226:                         * different than the interpretation of quotes above
        !           227:                         * -- which should prevail?
        !           228:                         */
        !           229:                        while (*compilepat != EOS) {
        !           230:                                if (*compilepat == QUOTE) {
        !           231:                                        if (*++compilepat == EOS)
        !           232:                                                --compilepat;
        !           233:                                }
        !           234:                                *compilebuf++ = (u_char)*compilepat++;
        !           235:                        }
        !           236:                        *compilebuf = EOS;
        !           237:                }
        !           238:                return(globextend(patbuf, pglob));
        !           239:        } else if (!(flags & GLOB_NOSORT))
        !           240:                qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
        !           241:                    pglob->gl_pathc - oldpathc, sizeof(char *), compare);
        !           242:        return(0);
        !           243: }
        !           244:
        !           245: static int
        !           246: compare(p, q)
        !           247:        const void *p, *q;
        !           248: {
        !           249:        return(strcmp(*(char **)p, *(char **)q));
        !           250: }
        !           251:
        !           252: static
        !           253: glob1(pattern, pglob)
        !           254:        Char *pattern;
        !           255:        glob_t *pglob;
        !           256: {
        !           257:        Char pathbuf[MAXPATHLEN+1];
        !           258:
        !           259:        /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
        !           260:        if (*pattern == EOS)
        !           261:                return(0);
        !           262:        return(glob2(pathbuf, pathbuf, pattern, pglob));
        !           263: }
        !           264:
        !           265: /*
        !           266:  * The functions glob2 and glob3 are mutually recursive; there is one level
        !           267:  * of recursion for each segment in the pattern that contains one or more
        !           268:  * meta characters.
        !           269:  */
        !           270: static
        !           271: glob2(pathbuf, pathend, pattern, pglob)
        !           272:        Char *pathbuf, *pathend, *pattern;
        !           273:        glob_t *pglob;
        !           274: {
        !           275:        struct stat sb;
        !           276:        Char *p, *q;
        !           277:        int anymeta;
        !           278:
        !           279:        /*
        !           280:         * Loop over pattern segments until end of pattern or until
        !           281:         * segment with meta character found.
        !           282:         */
        !           283:        for (anymeta = 0;;) {
        !           284:                if (*pattern == EOS) {          /* End of pattern? */
        !           285:                        *pathend = EOS;
        !           286:                        if (g_stat(pathbuf, &sb))
        !           287:                                return(0);
        !           288:
        !           289:                        if (((pglob->gl_flags & GLOB_MARK) &&
        !           290:                            pathend[-1] != SEP) && (S_ISDIR(sb.st_mode)
        !           291:                            || (S_ISLNK(sb.st_mode) &&
        !           292:                            (g_stat(pathbuf, &sb) == 0) &&
        !           293:                            S_ISDIR(sb.st_mode)))) {
        !           294:                                *pathend++ = SEP;
        !           295:                                *pathend = EOS;
        !           296:                        }
        !           297:                        ++pglob->gl_matchc;
        !           298:                        return(globextend(pathbuf, pglob));
        !           299:                }
        !           300:
        !           301:                /* Find end of next segment, copy tentatively to pathend. */
        !           302:                q = pathend;
        !           303:                p = pattern;
        !           304:                while (*p != EOS && *p != SEP) {
        !           305:                        if (ismeta(*p))
        !           306:                                anymeta = 1;
        !           307:                        *q++ = *p++;
        !           308:                }
        !           309:
        !           310:                if (!anymeta) {         /* No expansion, do next segment. */
        !           311:                        pathend = q;
        !           312:                        pattern = p;
        !           313:                        while (*pattern == SEP)
        !           314:                                *pathend++ = *pattern++;
        !           315:                } else                  /* Need expansion, recurse. */
        !           316:                        return(glob3(pathbuf, pathend, pattern, p, pglob));
        !           317:        }
        !           318:        /* NOTREACHED */
        !           319: }
        !           320:
        !           321: static
        !           322: glob3(pathbuf, pathend, pattern, restpattern, pglob)
        !           323:        Char *pathbuf, *pathend, *pattern, *restpattern;
        !           324:        glob_t *pglob;
        !           325: {
        !           326:        register struct dirent *dp;
        !           327:        DIR *dirp;
        !           328:        int len, err;
        !           329:
        !           330:        *pathend = EOS;
        !           331:        errno = 0;
        !           332:
        !           333:        if (!(dirp = g_opendir(pathbuf)))
        !           334:                /* TODO: don't call for ENOENT or ENOTDIR? */
        !           335:                if (pglob->gl_errfunc &&
        !           336:                    (*pglob->gl_errfunc)(pathbuf, errno) ||
        !           337:                    (pglob->gl_flags & GLOB_ERR))
        !           338:                        return(GLOB_ABEND);
        !           339:                else
        !           340:                        return(0);
        !           341:
        !           342:        err = 0;
        !           343:
        !           344:        /* Search directory for matching names. */
        !           345:        while ((dp = readdir(dirp))) {
        !           346:                register u_char *sc;
        !           347:                register Char *dc;
        !           348:
        !           349:                /* Initial DOT must be matched literally. */
        !           350:                if (dp->d_name[0] == DOT && *pattern != DOT)
        !           351:                        continue;
        !           352:                for (sc = (u_char *) dp->d_name, dc = pathend;
        !           353:                     *dc++ = *sc++;);
        !           354:                if (!match(pathend, pattern, restpattern)) {
        !           355:                        *pathend = EOS;
        !           356:                        continue;
        !           357:                }
        !           358:                err = glob2(pathbuf, --dc, restpattern, pglob);
        !           359:                if (err)
        !           360:                        break;
        !           361:        }
        !           362:
        !           363:        /* TODO: check error from readdir? */
        !           364:        (void)closedir(dirp);
        !           365:        return(err);
        !           366: }
        !           367:
        !           368:
        !           369: /*
        !           370:  * Extend the gl_pathv member of a glob_t structure to accomodate a new item,
        !           371:  * add the new item, and update gl_pathc.
        !           372:  *
        !           373:  * This assumes the BSD realloc, which only copies the block when its size
        !           374:  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
        !           375:  * behavior.
        !           376:  *
        !           377:  * Return 0 if new item added, error code if memory couldn't be allocated.
        !           378:  *
        !           379:  * Invariant of the glob_t structure:
        !           380:  *     Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
        !           381:  *     gl_pathv points to (gl_offs + gl_pathc + 1) items.
        !           382:  */
        !           383: static int
        !           384: globextend(path, pglob)
        !           385:        Char *path;
        !           386:        glob_t *pglob;
        !           387: {
        !           388:        register char **pathv;
        !           389:        register int i;
        !           390:        u_int newsize;
        !           391:        char *copy;
        !           392:        Char *p;
        !           393:
        !           394:        newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
        !           395:        pathv = (char **)realloc((char *)pglob->gl_pathv, newsize);
        !           396:        if (pathv == NULL)
        !           397:                return(GLOB_NOSPACE);
        !           398:
        !           399:        if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
        !           400:                /* first time around -- clear initial gl_offs items */
        !           401:                pathv += pglob->gl_offs;
        !           402:                for (i = pglob->gl_offs; --i >= 0; )
        !           403:                        *--pathv = NULL;
        !           404:        }
        !           405:        pglob->gl_pathv = pathv;
        !           406:
        !           407:        for (p = path; *p++;);
        !           408:        if ((copy = malloc(p - path)) != NULL) {
        !           409:                g_Ctoc(path, copy);
        !           410:                pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
        !           411:        }
        !           412:        pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
        !           413:        return(copy == NULL ? GLOB_NOSPACE : 0);
        !           414: }
        !           415:
        !           416:
        !           417: /*
        !           418:  * pattern matching function for filenames.  Each occurrence of the *
        !           419:  * pattern causes a recursion level.
        !           420:  */
        !           421: static
        !           422: match(name, pat, patend)
        !           423:        register Char *name, *pat, *patend;
        !           424: {
        !           425:        int ok, negate_range;
        !           426:        Char c, k;
        !           427:
        !           428:        while (pat < patend) {
        !           429:                c = *pat++;
        !           430:                switch (c & M_MASK) {
        !           431:                case M_ALL:
        !           432:                        if (pat == patend)
        !           433:                                return(1);
        !           434:                        for (; *name != EOS; ++name)
        !           435:                                if (match(name, pat, patend))
        !           436:                                        return(1);
        !           437:                        return(0);
        !           438:                case M_ONE:
        !           439:                        if (*name++ == EOS)
        !           440:                                return(0);
        !           441:                        break;
        !           442:                case M_SET:
        !           443:                        ok = 0;
        !           444:                        k = *name++;
        !           445:                        if (negate_range = ((*pat & M_MASK) == M_NOT))
        !           446:                                ++pat;
        !           447:                        while (((c = *pat++) & M_MASK) != M_END)
        !           448:                                if ((*pat & M_MASK) == M_RNG) {
        !           449:                                        if (c <= k && k <= pat[1])
        !           450:                                                ok = 1;
        !           451:                                        pat += 2;
        !           452:                                } else if (c == k)
        !           453:                                        ok = 1;
        !           454:                        if (ok == negate_range)
        !           455:                                return(0);
        !           456:                        break;
        !           457:                default:
        !           458:                        if (*name++ != c)
        !           459:                                return(0);
        !           460:                        break;
        !           461:                }
        !           462:        }
        !           463:        return(*name == EOS);
        !           464: }
        !           465:
        !           466: /* Free allocated data belonging to a glob_t structure. */
        !           467: void
        !           468: globfree(pglob)
        !           469:        glob_t *pglob;
        !           470: {
        !           471:        register int i;
        !           472:        register char **pp;
        !           473:
        !           474:        if (pglob->gl_pathv != NULL) {
        !           475:                pp = pglob->gl_pathv + pglob->gl_offs;
        !           476:                for (i = pglob->gl_pathc; i--; ++pp)
        !           477:                        if (*pp)
        !           478:                                free(*pp);
        !           479:                free(pglob->gl_pathv);
        !           480:        }
        !           481: }
        !           482:
        !           483: static DIR *
        !           484: g_opendir(str)
        !           485:        register Char *str;
        !           486: {
        !           487:        char buf[MAXPATHLEN];
        !           488:
        !           489:        if (!*str)
        !           490:                return(opendir("."));
        !           491:        g_Ctoc(str, buf);
        !           492:        return(opendir(buf));
        !           493: }
        !           494:
        !           495: static int
        !           496: g_lstat(fn, sb)
        !           497:        register Char *fn;
        !           498:        struct stat *sb;
        !           499: {
        !           500:        char buf[MAXPATHLEN];
        !           501:
        !           502:        g_Ctoc(fn, buf);
        !           503:        return(lstat(buf, sb));
        !           504: }
        !           505:
        !           506: static int
        !           507: g_stat(fn, sb)
        !           508:        register Char *fn;
        !           509:        struct stat *sb;
        !           510: {
        !           511:        char buf[MAXPATHLEN];
        !           512:
        !           513:        g_Ctoc(fn, buf);
        !           514:        return(stat(buf, sb));
        !           515: }
        !           516:
        !           517: static Char *
        !           518: g_strchr(str, ch)
        !           519:        Char *str;
        !           520:        int ch;
        !           521: {
        !           522:        do {
        !           523:                if (*str == ch)
        !           524:                        return (str);
        !           525:        } while (*str++);
        !           526:        return (NULL);
        !           527: }
        !           528:
        !           529: static void
        !           530: g_Ctoc(str, buf)
        !           531:        register Char *str;
        !           532:        char *buf;
        !           533: {
        !           534:        register char *dc;
        !           535:
        !           536:        for (dc = buf; *dc++ = *str++;);
        !           537: }
        !           538:
        !           539: #ifdef DEBUG
        !           540: static void
        !           541: qprintf(s)
        !           542:        register Char *s;
        !           543: {
        !           544:        register Char *p;
        !           545:
        !           546:        for (p = s; *p; p++)
        !           547:                (void)printf("%c", *p & 0xff);
        !           548:        (void)printf("\n");
        !           549:        for (p = s; *p; p++)
        !           550:                (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
        !           551:        (void)printf("\n");
        !           552:        for (p = s; *p; p++)
        !           553:                (void)printf("%c", *p & M_META ? '_' : ' ');
        !           554:        (void)printf("\n");
        !           555: }
        !           556: #endif

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