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Annotation of src/lib/libc/gen/glob.c, Revision 1.8

1.8     ! fvdl        1: /*     $NetBSD: glob.c,v 1.7 1997/07/21 14:07:17 jtc Exp $     */
1.5       cgd         2:
1.1       cgd         3: /*
1.4       cgd         4:  * Copyright (c) 1989, 1993
                      5:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd         6:  *
                      7:  * This code is derived from software contributed to Berkeley by
                      8:  * Guido van Rossum.
                      9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
                     18:  * 3. All advertising materials mentioning features or use of this software
                     19:  *    must display the following acknowledgement:
                     20:  *     This product includes software developed by the University of
                     21:  *     California, Berkeley and its contributors.
                     22:  * 4. Neither the name of the University nor the names of its contributors
                     23:  *    may be used to endorse or promote products derived from this software
                     24:  *    without specific prior written permission.
                     25:  *
                     26:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     27:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     28:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     29:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     30:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     31:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     32:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     33:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     34:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     35:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     36:  * SUCH DAMAGE.
                     37:  */
                     38:
1.6       christos   39: #include <sys/cdefs.h>
1.1       cgd        40: #if defined(LIBC_SCCS) && !defined(lint)
1.5       cgd        41: #if 0
                     42: static char sccsid[] = "@(#)glob.c     8.3 (Berkeley) 10/13/93";
                     43: #else
1.8     ! fvdl       44: __RCSID("$NetBSD: glob.c,v 1.7 1997/07/21 14:07:17 jtc Exp $");
1.5       cgd        45: #endif
1.1       cgd        46: #endif /* LIBC_SCCS and not lint */
                     47:
                     48: /*
                     49:  * glob(3) -- a superset of the one defined in POSIX 1003.2.
                     50:  *
                     51:  * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
                     52:  *
                     53:  * Optional extra services, controlled by flags not defined by POSIX:
                     54:  *
                     55:  * GLOB_QUOTE:
                     56:  *     Escaping convention: \ inhibits any special meaning the following
                     57:  *     character might have (except \ at end of string is retained).
                     58:  * GLOB_MAGCHAR:
                     59:  *     Set in gl_flags if pattern contained a globbing character.
1.2       mycroft    60:  * GLOB_NOMAGIC:
                     61:  *     Same as GLOB_NOCHECK, but it will only append pattern if it did
                     62:  *     not contain any magic characters.  [Used in csh style globbing]
                     63:  * GLOB_ALTDIRFUNC:
                     64:  *     Use alternately specified directory access functions.
1.4       cgd        65:  * GLOB_TILDE:
                     66:  *     expand ~user/foo to the /home/dir/of/user/foo
                     67:  * GLOB_BRACE:
                     68:  *     expand {1,2}{a,b} to 1a 1b 2a 2b
1.1       cgd        69:  * gl_matchc:
                     70:  *     Number of matches in the current invocation of glob.
                     71:  */
                     72:
1.7       jtc        73: #include "namespace.h"
1.1       cgd        74: #include <sys/param.h>
                     75: #include <sys/stat.h>
1.4       cgd        76:
                     77: #include <ctype.h>
1.1       cgd        78: #include <dirent.h>
1.4       cgd        79: #include <errno.h>
1.1       cgd        80: #include <glob.h>
1.4       cgd        81: #include <pwd.h>
1.1       cgd        82: #include <stdio.h>
                     83: #include <stdlib.h>
1.4       cgd        84: #include <string.h>
                     85: #include <unistd.h>
1.7       jtc        86:
1.8     ! fvdl       87: #undef glob
        !            88: #undef globfree
        !            89: #undef fstat
        !            90: #undef lstat
        !            91: #undef stat
        !            92:
1.7       jtc        93: #ifdef __weak_alias
                     94: __weak_alias(glob,_glob);
                     95: __weak_alias(globfree,_globfree);
                     96: #endif
1.1       cgd        97:
                     98: #define        DOLLAR          '$'
                     99: #define        DOT             '.'
                    100: #define        EOS             '\0'
                    101: #define        LBRACKET        '['
                    102: #define        NOT             '!'
                    103: #define        QUESTION        '?'
                    104: #define        QUOTE           '\\'
                    105: #define        RANGE           '-'
                    106: #define        RBRACKET        ']'
                    107: #define        SEP             '/'
                    108: #define        STAR            '*'
                    109: #define        TILDE           '~'
                    110: #define        UNDERSCORE      '_'
1.4       cgd       111: #define        LBRACE          '{'
                    112: #define        RBRACE          '}'
                    113: #define        SLASH           '/'
                    114: #define        COMMA           ','
                    115:
                    116: #ifndef DEBUG
1.1       cgd       117:
                    118: #define        M_QUOTE         0x8000
                    119: #define        M_PROTECT       0x4000
                    120: #define        M_MASK          0xffff
                    121: #define        M_ASCII         0x00ff
                    122:
1.4       cgd       123: typedef u_short Char;
                    124:
                    125: #else
                    126:
                    127: #define        M_QUOTE         0x80
                    128: #define        M_PROTECT       0x40
                    129: #define        M_MASK          0xff
                    130: #define        M_ASCII         0x7f
                    131:
                    132: typedef char Char;
                    133:
                    134: #endif
                    135:
                    136:
                    137: #define        CHAR(c)         ((Char)((c)&M_ASCII))
                    138: #define        META(c)         ((Char)((c)|M_QUOTE))
1.1       cgd       139: #define        M_ALL           META('*')
                    140: #define        M_END           META(']')
                    141: #define        M_NOT           META('!')
                    142: #define        M_ONE           META('?')
                    143: #define        M_RNG           META('-')
                    144: #define        M_SET           META('[')
                    145: #define        ismeta(c)       (((c)&M_QUOTE) != 0)
                    146:
                    147:
                    148: static int      compare __P((const void *, const void *));
1.4       cgd       149: static void     g_Ctoc __P((const Char *, char *));
1.8     ! fvdl      150: static int      g_lstat __P((Char *, struct stat12 *, glob12_t *));
        !           151: static DIR     *g_opendir __P((Char *, glob12_t *));
1.1       cgd       152: static Char    *g_strchr __P((Char *, int));
1.4       cgd       153: #ifdef notdef
                    154: static Char    *g_strcat __P((Char *, const Char *));
                    155: #endif
1.8     ! fvdl      156: static int      g_stat __P((Char *, struct stat12 *, glob12_t *));
        !           157: static int      glob0 __P((const Char *, glob12_t *));
        !           158: static int      glob1 __P((Char *, glob12_t *));
        !           159: static int      glob2 __P((Char *, Char *, Char *, glob12_t *));
        !           160: static int      glob3 __P((Char *, Char *, Char *, Char *, glob12_t *));
        !           161: static int      globextend __P((const Char *, glob12_t *));
        !           162: static const Char *     globtilde __P((const Char *, Char *, glob12_t *));
        !           163: static int      globexp1 __P((const Char *, glob12_t *));
        !           164: static int      globexp2 __P((const Char *, const Char *, glob12_t *, int *));
1.1       cgd       165: static int      match __P((Char *, Char *, Char *));
                    166: #ifdef DEBUG
1.4       cgd       167: static void     qprintf __P((const char *, Char *));
1.1       cgd       168: #endif
                    169:
1.4       cgd       170: int
1.1       cgd       171: glob(pattern, flags, errfunc, pglob)
                    172:        const char *pattern;
1.4       cgd       173:        int flags, (*errfunc) __P((const char *, int));
1.8     ! fvdl      174:        glob12_t *pglob;
1.1       cgd       175: {
1.4       cgd       176:        const u_char *patnext;
                    177:        int c;
                    178:        Char *bufnext, *bufend, patbuf[MAXPATHLEN+1];
1.1       cgd       179:
                    180:        patnext = (u_char *) pattern;
                    181:        if (!(flags & GLOB_APPEND)) {
                    182:                pglob->gl_pathc = 0;
                    183:                pglob->gl_pathv = NULL;
                    184:                if (!(flags & GLOB_DOOFFS))
                    185:                        pglob->gl_offs = 0;
                    186:        }
                    187:        pglob->gl_flags = flags & ~GLOB_MAGCHAR;
                    188:        pglob->gl_errfunc = errfunc;
                    189:        pglob->gl_matchc = 0;
                    190:
                    191:        bufnext = patbuf;
                    192:        bufend = bufnext + MAXPATHLEN;
                    193:        if (flags & GLOB_QUOTE) {
                    194:                /* Protect the quoted characters. */
                    195:                while (bufnext < bufend && (c = *patnext++) != EOS)
                    196:                        if (c == QUOTE) {
                    197:                                if ((c = *patnext++) == EOS) {
                    198:                                        c = QUOTE;
                    199:                                        --patnext;
                    200:                                }
                    201:                                *bufnext++ = c | M_PROTECT;
                    202:                        }
                    203:                        else
                    204:                                *bufnext++ = c;
                    205:        }
                    206:        else
                    207:            while (bufnext < bufend && (c = *patnext++) != EOS)
                    208:                    *bufnext++ = c;
                    209:        *bufnext = EOS;
                    210:
1.4       cgd       211:        if (flags & GLOB_BRACE)
                    212:            return globexp1(patbuf, pglob);
                    213:        else
                    214:            return glob0(patbuf, pglob);
                    215: }
                    216:
                    217: /*
                    218:  * Expand recursively a glob {} pattern. When there is no more expansion
                    219:  * invoke the standard globbing routine to glob the rest of the magic
                    220:  * characters
                    221:  */
                    222: static int globexp1(pattern, pglob)
                    223:        const Char *pattern;
1.8     ! fvdl      224:        glob12_t *pglob;
1.4       cgd       225: {
                    226:        const Char* ptr = pattern;
                    227:        int rv;
                    228:
                    229:        /* Protect a single {}, for find(1), like csh */
                    230:        if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
                    231:                return glob0(pattern, pglob);
                    232:
                    233:        while ((ptr = (const Char *) g_strchr((Char *) ptr, LBRACE)) != NULL)
                    234:                if (!globexp2(ptr, pattern, pglob, &rv))
                    235:                        return rv;
                    236:
                    237:        return glob0(pattern, pglob);
                    238: }
                    239:
                    240:
                    241: /*
                    242:  * Recursive brace globbing helper. Tries to expand a single brace.
                    243:  * If it succeeds then it invokes globexp1 with the new pattern.
                    244:  * If it fails then it tries to glob the rest of the pattern and returns.
                    245:  */
                    246: static int globexp2(ptr, pattern, pglob, rv)
                    247:        const Char *ptr, *pattern;
1.8     ! fvdl      248:        glob12_t *pglob;
1.4       cgd       249:        int *rv;
                    250: {
                    251:        int     i;
                    252:        Char   *lm, *ls;
                    253:        const Char *pe, *pm, *pl;
                    254:        Char    patbuf[MAXPATHLEN + 1];
                    255:
                    256:        /* copy part up to the brace */
                    257:        for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
                    258:                continue;
                    259:        ls = lm;
                    260:
                    261:        /* Find the balanced brace */
                    262:        for (i = 0, pe = ++ptr; *pe; pe++)
                    263:                if (*pe == LBRACKET) {
                    264:                        /* Ignore everything between [] */
                    265:                        for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
                    266:                                continue;
                    267:                        if (*pe == EOS) {
                    268:                                /*
                    269:                                 * We could not find a matching RBRACKET.
                    270:                                 * Ignore and just look for RBRACE
                    271:                                 */
                    272:                                pe = pm;
                    273:                        }
                    274:                }
                    275:                else if (*pe == LBRACE)
                    276:                        i++;
                    277:                else if (*pe == RBRACE) {
                    278:                        if (i == 0)
                    279:                                break;
                    280:                        i--;
                    281:                }
                    282:
                    283:        /* Non matching braces; just glob the pattern */
                    284:        if (i != 0 || *pe == EOS) {
                    285:                *rv = glob0(patbuf, pglob);
                    286:                return 0;
                    287:        }
                    288:
                    289:        for (i = 0, pl = pm = ptr; pm <= pe; pm++)
                    290:                switch (*pm) {
                    291:                case LBRACKET:
                    292:                        /* Ignore everything between [] */
                    293:                        for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
                    294:                                continue;
                    295:                        if (*pm == EOS) {
                    296:                                /*
                    297:                                 * We could not find a matching RBRACKET.
                    298:                                 * Ignore and just look for RBRACE
                    299:                                 */
                    300:                                pm = pl;
                    301:                        }
                    302:                        break;
                    303:
                    304:                case LBRACE:
                    305:                        i++;
                    306:                        break;
                    307:
                    308:                case RBRACE:
                    309:                        if (i) {
                    310:                            i--;
                    311:                            break;
                    312:                        }
                    313:                        /* FALLTHROUGH */
                    314:                case COMMA:
                    315:                        if (i && *pm == COMMA)
                    316:                                break;
                    317:                        else {
                    318:                                /* Append the current string */
                    319:                                for (lm = ls; (pl < pm); *lm++ = *pl++)
                    320:                                        continue;
                    321:                                /*
                    322:                                 * Append the rest of the pattern after the
                    323:                                 * closing brace
                    324:                                 */
                    325:                                for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
                    326:                                        continue;
                    327:
                    328:                                /* Expand the current pattern */
                    329: #ifdef DEBUG
                    330:                                qprintf("globexp2:", patbuf);
                    331: #endif
                    332:                                *rv = globexp1(patbuf, pglob);
                    333:
                    334:                                /* move after the comma, to the next string */
                    335:                                pl = pm + 1;
                    336:                        }
                    337:                        break;
                    338:
                    339:                default:
                    340:                        break;
                    341:                }
                    342:        *rv = 0;
                    343:        return 0;
                    344: }
                    345:
                    346:
                    347:
                    348: /*
                    349:  * expand tilde from the passwd file.
                    350:  */
                    351: static const Char *
                    352: globtilde(pattern, patbuf, pglob)
                    353:        const Char *pattern;
                    354:        Char *patbuf;
1.8     ! fvdl      355:        glob12_t *pglob;
1.4       cgd       356: {
                    357:        struct passwd *pwd;
                    358:        char *h;
                    359:        const Char *p;
                    360:        Char *b;
                    361:
                    362:        if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
                    363:                return pattern;
                    364:
                    365:        /* Copy up to the end of the string or / */
                    366:        for (p = pattern + 1, h = (char *) patbuf; *p && *p != SLASH;
                    367:             *h++ = *p++)
                    368:                continue;
                    369:
                    370:        *h = EOS;
                    371:
                    372:        if (((char *) patbuf)[0] == EOS) {
                    373:                /*
                    374:                 * handle a plain ~ or ~/ by expanding $HOME
                    375:                 * first and then trying the password file
                    376:                 */
                    377:                if ((h = getenv("HOME")) == NULL) {
                    378:                        if ((pwd = getpwuid(getuid())) == NULL)
                    379:                                return pattern;
                    380:                        else
                    381:                                h = pwd->pw_dir;
                    382:                }
                    383:        }
                    384:        else {
                    385:                /*
                    386:                 * Expand a ~user
                    387:                 */
                    388:                if ((pwd = getpwnam((char*) patbuf)) == NULL)
                    389:                        return pattern;
                    390:                else
                    391:                        h = pwd->pw_dir;
                    392:        }
                    393:
                    394:        /* Copy the home directory */
                    395:        for (b = patbuf; *h; *b++ = *h++)
                    396:                continue;
                    397:
                    398:        /* Append the rest of the pattern */
                    399:        while ((*b++ = *p++) != EOS)
                    400:                continue;
                    401:
                    402:        return patbuf;
                    403: }
                    404:
                    405:
                    406: /*
                    407:  * The main glob() routine: compiles the pattern (optionally processing
                    408:  * quotes), calls glob1() to do the real pattern matching, and finally
                    409:  * sorts the list (unless unsorted operation is requested).  Returns 0
                    410:  * if things went well, nonzero if errors occurred.  It is not an error
                    411:  * to find no matches.
                    412:  */
                    413: static int
                    414: glob0(pattern, pglob)
                    415:        const Char *pattern;
1.8     ! fvdl      416:        glob12_t *pglob;
1.4       cgd       417: {
                    418:        const Char *qpatnext;
                    419:        int c, err, oldpathc;
                    420:        Char *bufnext, patbuf[MAXPATHLEN+1];
                    421:
                    422:        qpatnext = globtilde(pattern, patbuf, pglob);
                    423:        oldpathc = pglob->gl_pathc;
1.1       cgd       424:        bufnext = patbuf;
1.4       cgd       425:
1.1       cgd       426:        /* We don't need to check for buffer overflow any more. */
                    427:        while ((c = *qpatnext++) != EOS) {
                    428:                switch (c) {
                    429:                case LBRACKET:
                    430:                        c = *qpatnext;
                    431:                        if (c == NOT)
                    432:                                ++qpatnext;
                    433:                        if (*qpatnext == EOS ||
1.4       cgd       434:                            g_strchr((Char *) qpatnext+1, RBRACKET) == NULL) {
1.1       cgd       435:                                *bufnext++ = LBRACKET;
                    436:                                if (c == NOT)
                    437:                                        --qpatnext;
                    438:                                break;
                    439:                        }
                    440:                        *bufnext++ = M_SET;
                    441:                        if (c == NOT)
                    442:                                *bufnext++ = M_NOT;
                    443:                        c = *qpatnext++;
                    444:                        do {
                    445:                                *bufnext++ = CHAR(c);
                    446:                                if (*qpatnext == RANGE &&
                    447:                                    (c = qpatnext[1]) != RBRACKET) {
                    448:                                        *bufnext++ = M_RNG;
                    449:                                        *bufnext++ = CHAR(c);
                    450:                                        qpatnext += 2;
                    451:                                }
                    452:                        } while ((c = *qpatnext++) != RBRACKET);
1.2       mycroft   453:                        pglob->gl_flags |= GLOB_MAGCHAR;
1.1       cgd       454:                        *bufnext++ = M_END;
                    455:                        break;
                    456:                case QUESTION:
                    457:                        pglob->gl_flags |= GLOB_MAGCHAR;
                    458:                        *bufnext++ = M_ONE;
                    459:                        break;
                    460:                case STAR:
                    461:                        pglob->gl_flags |= GLOB_MAGCHAR;
1.2       mycroft   462:                        /* collapse adjacent stars to one,
                    463:                         * to avoid exponential behavior
                    464:                         */
                    465:                        if (bufnext == patbuf || bufnext[-1] != M_ALL)
                    466:                            *bufnext++ = M_ALL;
1.1       cgd       467:                        break;
                    468:                default:
                    469:                        *bufnext++ = CHAR(c);
                    470:                        break;
                    471:                }
                    472:        }
                    473:        *bufnext = EOS;
                    474: #ifdef DEBUG
1.4       cgd       475:        qprintf("glob0:", patbuf);
1.1       cgd       476: #endif
                    477:
                    478:        if ((err = glob1(patbuf, pglob)) != 0)
                    479:                return(err);
                    480:
1.2       mycroft   481:        /*
                    482:         * If there was no match we are going to append the pattern
                    483:         * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
                    484:         * and the pattern did not contain any magic characters
                    485:         * GLOB_NOMAGIC is there just for compatibility with csh.
                    486:         */
                    487:        if (pglob->gl_pathc == oldpathc &&
1.4       cgd       488:            ((pglob->gl_flags & GLOB_NOCHECK) ||
                    489:              ((pglob->gl_flags & GLOB_NOMAGIC) &&
                    490:               !(pglob->gl_flags & GLOB_MAGCHAR))))
                    491:                return(globextend(pattern, pglob));
                    492:        else if (!(pglob->gl_flags & GLOB_NOSORT))
1.1       cgd       493:                qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
                    494:                    pglob->gl_pathc - oldpathc, sizeof(char *), compare);
                    495:        return(0);
                    496: }
                    497:
                    498: static int
                    499: compare(p, q)
                    500:        const void *p, *q;
                    501: {
                    502:        return(strcmp(*(char **)p, *(char **)q));
                    503: }
                    504:
1.4       cgd       505: static int
1.1       cgd       506: glob1(pattern, pglob)
                    507:        Char *pattern;
1.8     ! fvdl      508:        glob12_t *pglob;
1.1       cgd       509: {
                    510:        Char pathbuf[MAXPATHLEN+1];
                    511:
                    512:        /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
                    513:        if (*pattern == EOS)
                    514:                return(0);
                    515:        return(glob2(pathbuf, pathbuf, pattern, pglob));
                    516: }
                    517:
                    518: /*
                    519:  * The functions glob2 and glob3 are mutually recursive; there is one level
                    520:  * of recursion for each segment in the pattern that contains one or more
                    521:  * meta characters.
                    522:  */
1.4       cgd       523: static int
1.1       cgd       524: glob2(pathbuf, pathend, pattern, pglob)
                    525:        Char *pathbuf, *pathend, *pattern;
1.8     ! fvdl      526:        glob12_t *pglob;
1.1       cgd       527: {
1.8     ! fvdl      528:        struct stat12 sb;
1.1       cgd       529:        Char *p, *q;
                    530:        int anymeta;
                    531:
                    532:        /*
                    533:         * Loop over pattern segments until end of pattern or until
                    534:         * segment with meta character found.
                    535:         */
                    536:        for (anymeta = 0;;) {
                    537:                if (*pattern == EOS) {          /* End of pattern? */
                    538:                        *pathend = EOS;
1.2       mycroft   539:                        if (g_lstat(pathbuf, &sb, pglob))
1.1       cgd       540:                                return(0);
                    541:
                    542:                        if (((pglob->gl_flags & GLOB_MARK) &&
                    543:                            pathend[-1] != SEP) && (S_ISDIR(sb.st_mode)
                    544:                            || (S_ISLNK(sb.st_mode) &&
1.2       mycroft   545:                            (g_stat(pathbuf, &sb, pglob) == 0) &&
1.1       cgd       546:                            S_ISDIR(sb.st_mode)))) {
                    547:                                *pathend++ = SEP;
                    548:                                *pathend = EOS;
                    549:                        }
                    550:                        ++pglob->gl_matchc;
                    551:                        return(globextend(pathbuf, pglob));
                    552:                }
                    553:
                    554:                /* Find end of next segment, copy tentatively to pathend. */
                    555:                q = pathend;
                    556:                p = pattern;
                    557:                while (*p != EOS && *p != SEP) {
                    558:                        if (ismeta(*p))
                    559:                                anymeta = 1;
                    560:                        *q++ = *p++;
                    561:                }
                    562:
                    563:                if (!anymeta) {         /* No expansion, do next segment. */
                    564:                        pathend = q;
                    565:                        pattern = p;
                    566:                        while (*pattern == SEP)
                    567:                                *pathend++ = *pattern++;
                    568:                } else                  /* Need expansion, recurse. */
                    569:                        return(glob3(pathbuf, pathend, pattern, p, pglob));
                    570:        }
                    571:        /* NOTREACHED */
                    572: }
                    573:
1.4       cgd       574: static int
1.1       cgd       575: glob3(pathbuf, pathend, pattern, restpattern, pglob)
                    576:        Char *pathbuf, *pathend, *pattern, *restpattern;
1.8     ! fvdl      577:        glob12_t *pglob;
1.1       cgd       578: {
                    579:        register struct dirent *dp;
                    580:        DIR *dirp;
1.4       cgd       581:        int err;
1.2       mycroft   582:        char buf[MAXPATHLEN];
1.1       cgd       583:
1.4       cgd       584:        /*
                    585:         * The readdirfunc declaration can't be prototyped, because it is
                    586:         * assigned, below, to two functions which are prototyped in glob.h
                    587:         * and dirent.h as taking pointers to differently typed opaque
                    588:         * structures.
                    589:         */
1.6       christos  590:        struct dirent *(*readdirfunc) __P((void *));
1.4       cgd       591:
1.1       cgd       592:        *pathend = EOS;
                    593:        errno = 0;
                    594:
1.2       mycroft   595:        if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
1.1       cgd       596:                /* TODO: don't call for ENOENT or ENOTDIR? */
1.2       mycroft   597:                if (pglob->gl_errfunc) {
                    598:                        g_Ctoc(pathbuf, buf);
                    599:                        if (pglob->gl_errfunc(buf, errno) ||
                    600:                            pglob->gl_flags & GLOB_ERR)
                    601:                                return (GLOB_ABEND);
                    602:                }
                    603:                return(0);
                    604:        }
1.1       cgd       605:
                    606:        err = 0;
                    607:
                    608:        /* Search directory for matching names. */
1.2       mycroft   609:        if (pglob->gl_flags & GLOB_ALTDIRFUNC)
                    610:                readdirfunc = pglob->gl_readdir;
                    611:        else
1.6       christos  612:                readdirfunc = (struct dirent *(*)__P((void *))) readdir;
1.2       mycroft   613:        while ((dp = (*readdirfunc)(dirp))) {
1.1       cgd       614:                register u_char *sc;
                    615:                register Char *dc;
                    616:
                    617:                /* Initial DOT must be matched literally. */
                    618:                if (dp->d_name[0] == DOT && *pattern != DOT)
                    619:                        continue;
                    620:                for (sc = (u_char *) dp->d_name, dc = pathend;
1.4       cgd       621:                     (*dc++ = *sc++) != EOS;)
                    622:                        continue;
1.1       cgd       623:                if (!match(pathend, pattern, restpattern)) {
                    624:                        *pathend = EOS;
                    625:                        continue;
                    626:                }
                    627:                err = glob2(pathbuf, --dc, restpattern, pglob);
                    628:                if (err)
                    629:                        break;
                    630:        }
                    631:
1.2       mycroft   632:        if (pglob->gl_flags & GLOB_ALTDIRFUNC)
                    633:                (*pglob->gl_closedir)(dirp);
                    634:        else
                    635:                closedir(dirp);
1.1       cgd       636:        return(err);
                    637: }
                    638:
                    639:
                    640: /*
1.8     ! fvdl      641:  * Extend the gl_pathv member of a glob12_t structure to accomodate a new item,
1.1       cgd       642:  * add the new item, and update gl_pathc.
                    643:  *
                    644:  * This assumes the BSD realloc, which only copies the block when its size
                    645:  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
                    646:  * behavior.
                    647:  *
                    648:  * Return 0 if new item added, error code if memory couldn't be allocated.
                    649:  *
1.8     ! fvdl      650:  * Invariant of the glob12_t structure:
1.1       cgd       651:  *     Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
                    652:  *     gl_pathv points to (gl_offs + gl_pathc + 1) items.
                    653:  */
                    654: static int
                    655: globextend(path, pglob)
1.4       cgd       656:        const Char *path;
1.8     ! fvdl      657:        glob12_t *pglob;
1.1       cgd       658: {
                    659:        register char **pathv;
                    660:        register int i;
                    661:        u_int newsize;
                    662:        char *copy;
1.4       cgd       663:        const Char *p;
1.1       cgd       664:
                    665:        newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
1.4       cgd       666:        pathv = pglob->gl_pathv ?
                    667:                    realloc((char *)pglob->gl_pathv, newsize) :
                    668:                    malloc(newsize);
1.1       cgd       669:        if (pathv == NULL)
                    670:                return(GLOB_NOSPACE);
                    671:
                    672:        if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
                    673:                /* first time around -- clear initial gl_offs items */
                    674:                pathv += pglob->gl_offs;
                    675:                for (i = pglob->gl_offs; --i >= 0; )
                    676:                        *--pathv = NULL;
                    677:        }
                    678:        pglob->gl_pathv = pathv;
                    679:
1.4       cgd       680:        for (p = path; *p++;)
                    681:                continue;
1.1       cgd       682:        if ((copy = malloc(p - path)) != NULL) {
                    683:                g_Ctoc(path, copy);
                    684:                pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
                    685:        }
                    686:        pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
                    687:        return(copy == NULL ? GLOB_NOSPACE : 0);
                    688: }
                    689:
                    690:
                    691: /*
                    692:  * pattern matching function for filenames.  Each occurrence of the *
                    693:  * pattern causes a recursion level.
                    694:  */
1.4       cgd       695: static int
1.1       cgd       696: match(name, pat, patend)
                    697:        register Char *name, *pat, *patend;
                    698: {
                    699:        int ok, negate_range;
                    700:        Char c, k;
                    701:
                    702:        while (pat < patend) {
                    703:                c = *pat++;
                    704:                switch (c & M_MASK) {
                    705:                case M_ALL:
                    706:                        if (pat == patend)
                    707:                                return(1);
1.2       mycroft   708:                        do
                    709:                            if (match(name, pat, patend))
                    710:                                    return(1);
                    711:                        while (*name++ != EOS);
1.1       cgd       712:                        return(0);
                    713:                case M_ONE:
                    714:                        if (*name++ == EOS)
                    715:                                return(0);
                    716:                        break;
                    717:                case M_SET:
                    718:                        ok = 0;
1.2       mycroft   719:                        if ((k = *name++) == EOS)
                    720:                                return(0);
1.4       cgd       721:                        if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
1.1       cgd       722:                                ++pat;
                    723:                        while (((c = *pat++) & M_MASK) != M_END)
                    724:                                if ((*pat & M_MASK) == M_RNG) {
                    725:                                        if (c <= k && k <= pat[1])
                    726:                                                ok = 1;
                    727:                                        pat += 2;
                    728:                                } else if (c == k)
                    729:                                        ok = 1;
                    730:                        if (ok == negate_range)
                    731:                                return(0);
                    732:                        break;
                    733:                default:
                    734:                        if (*name++ != c)
                    735:                                return(0);
                    736:                        break;
                    737:                }
                    738:        }
                    739:        return(*name == EOS);
                    740: }
                    741:
1.8     ! fvdl      742: /* Free allocated data belonging to a glob12_t structure. */
1.1       cgd       743: void
                    744: globfree(pglob)
1.8     ! fvdl      745:        glob12_t *pglob;
1.1       cgd       746: {
                    747:        register int i;
                    748:        register char **pp;
                    749:
                    750:        if (pglob->gl_pathv != NULL) {
                    751:                pp = pglob->gl_pathv + pglob->gl_offs;
                    752:                for (i = pglob->gl_pathc; i--; ++pp)
                    753:                        if (*pp)
                    754:                                free(*pp);
                    755:                free(pglob->gl_pathv);
                    756:        }
                    757: }
                    758:
                    759: static DIR *
1.2       mycroft   760: g_opendir(str, pglob)
1.1       cgd       761:        register Char *str;
1.8     ! fvdl      762:        glob12_t *pglob;
1.1       cgd       763: {
                    764:        char buf[MAXPATHLEN];
                    765:
                    766:        if (!*str)
1.2       mycroft   767:                strcpy(buf, ".");
                    768:        else
                    769:                g_Ctoc(str, buf);
1.4       cgd       770:
1.2       mycroft   771:        if (pglob->gl_flags & GLOB_ALTDIRFUNC)
                    772:                return((*pglob->gl_opendir)(buf));
1.4       cgd       773:
1.1       cgd       774:        return(opendir(buf));
                    775: }
                    776:
                    777: static int
1.2       mycroft   778: g_lstat(fn, sb, pglob)
1.1       cgd       779:        register Char *fn;
1.8     ! fvdl      780:        struct stat12 *sb;
        !           781:        glob12_t *pglob;
1.1       cgd       782: {
                    783:        char buf[MAXPATHLEN];
                    784:
                    785:        g_Ctoc(fn, buf);
1.2       mycroft   786:        if (pglob->gl_flags & GLOB_ALTDIRFUNC)
                    787:                return((*pglob->gl_lstat)(buf, sb));
1.1       cgd       788:        return(lstat(buf, sb));
                    789: }
                    790:
                    791: static int
1.2       mycroft   792: g_stat(fn, sb, pglob)
1.1       cgd       793:        register Char *fn;
1.8     ! fvdl      794:        struct stat12 *sb;
        !           795:        glob12_t *pglob;
1.1       cgd       796: {
                    797:        char buf[MAXPATHLEN];
                    798:
                    799:        g_Ctoc(fn, buf);
1.2       mycroft   800:        if (pglob->gl_flags & GLOB_ALTDIRFUNC)
                    801:                return((*pglob->gl_stat)(buf, sb));
1.1       cgd       802:        return(stat(buf, sb));
                    803: }
                    804:
                    805: static Char *
                    806: g_strchr(str, ch)
                    807:        Char *str;
                    808:        int ch;
                    809: {
                    810:        do {
                    811:                if (*str == ch)
                    812:                        return (str);
                    813:        } while (*str++);
                    814:        return (NULL);
                    815: }
                    816:
1.4       cgd       817: #ifdef notdef
                    818: static Char *
                    819: g_strcat(dst, src)
                    820:        Char *dst;
                    821:        const Char* src;
                    822: {
                    823:        Char *sdst = dst;
                    824:
                    825:        while (*dst++)
                    826:                continue;
                    827:        --dst;
                    828:        while((*dst++ = *src++) != EOS)
                    829:            continue;
                    830:
                    831:        return (sdst);
                    832: }
                    833: #endif
                    834:
1.1       cgd       835: static void
                    836: g_Ctoc(str, buf)
1.4       cgd       837:        register const Char *str;
1.1       cgd       838:        char *buf;
                    839: {
                    840:        register char *dc;
                    841:
1.4       cgd       842:        for (dc = buf; (*dc++ = *str++) != EOS;)
                    843:                continue;
1.1       cgd       844: }
                    845:
                    846: #ifdef DEBUG
                    847: static void
1.4       cgd       848: qprintf(str, s)
                    849:        const char *str;
1.1       cgd       850:        register Char *s;
                    851: {
                    852:        register Char *p;
                    853:
1.4       cgd       854:        (void)printf("%s:\n", str);
1.1       cgd       855:        for (p = s; *p; p++)
1.2       mycroft   856:                (void)printf("%c", CHAR(*p));
1.1       cgd       857:        (void)printf("\n");
                    858:        for (p = s; *p; p++)
                    859:                (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
                    860:        (void)printf("\n");
                    861:        for (p = s; *p; p++)
1.2       mycroft   862:                (void)printf("%c", ismeta(*p) ? '_' : ' ');
1.1       cgd       863:        (void)printf("\n");
                    864: }
                    865: #endif

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