/*      $NetBSD: glob.c,v 1.39 2019/05/29 01:21:33 christos Exp $       */

/*
 * Copyright (c) 1989, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Guido van Rossum.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)glob.c      8.3 (Berkeley) 10/13/93";
#else
__RCSID("$NetBSD: glob.c,v 1.39 2019/05/29 01:21:33 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */

/*
 * glob(3) -- a superset of the one defined in POSIX 1003.2.
 *
 * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
 *
 * Optional extra services, controlled by flags not defined by POSIX:
 *
 * GLOB_MAGCHAR:
 *      Set in gl_flags if pattern contained a globbing character.
 * GLOB_NOMAGIC:
 *      Same as GLOB_NOCHECK, but it will only append pattern if it did
 *      not contain any magic characters.  [Used in csh style globbing]
 * GLOB_ALTDIRFUNC:
 *      Use alternately specified directory access functions.
 * GLOB_TILDE:
 *      expand ~user/foo to the /home/dir/of/user/foo
 * GLOB_BRACE:
 *      expand {1,2}{a,b} to 1a 1b 2a 2b 
 * GLOB_PERIOD:
 *      allow metacharacters to match leading dots in filenames.
 * GLOB_NO_DOTDIRS:
 *      . and .. are hidden from wildcards, even if GLOB_PERIOD is set.
 * gl_matchc:
 *      Number of matches in the current invocation of glob.
 */

#include "namespace.h"
#include <sys/param.h>
#include <sys/stat.h>

#include <assert.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <glob.h>
#include <pwd.h>
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#ifdef HAVE_NBTOOL_CONFIG_H
#define NO_GETPW_R
#endif

#define GLOB_LIMIT_STRING       524288  /* number of readdirs */
#define GLOB_LIMIT_STAT         128     /* number of stat system calls */
#define GLOB_LIMIT_READDIR      65536   /* total buffer size of path strings */
#define GLOB_LIMIT_PATH         1024    /* number of path elements */
#define GLOB_LIMIT_BRACE        128     /* Number of brace calls */

struct glob_limit {
        size_t l_string;
        size_t l_stat;  
        size_t l_readdir;       
        size_t l_brace;
};

/*
 * XXX: For NetBSD 1.4.x compatibility. (kill me l8r)
 */
#ifndef _DIAGASSERT
#define _DIAGASSERT(a)
#endif

#define DOLLAR          '$'
#define DOT             '.'
#define EOS             '\0'
#define LBRACKET        '['
#define NOT             '!'
#define QUESTION        '?'
#define QUOTE           '\\'
#define RANGE           '-'
#define RBRACKET        ']'
#define SEP             '/'
#define STAR            '*'
#define TILDE           '~'
#define UNDERSCORE      '_'
#define LBRACE          '{'
#define RBRACE          '}'
#define SLASH           '/'
#define COMMA           ','

#ifndef USE_8BIT_CHARS

#define M_QUOTE         0x8000
#define M_PROTECT       0x4000
#define M_MASK          0xffff
#define M_ASCII         0x00ff

typedef unsigned short Char;

#else

#define M_QUOTE         (Char)0x80
#define M_PROTECT       (Char)0x40
#define M_MASK          (Char)0xff
#define M_ASCII         (Char)0x7f

typedef char Char;

#endif


#define CHAR(c)         ((Char)((c)&M_ASCII))
#define META(c)         ((Char)((c)|M_QUOTE))
#define M_ALL           META('*')
#define M_END           META(']')
#define M_NOT           META('!')
#define M_ONE           META('?')
#define M_RNG           META('-')
#define M_SET           META('[')
#define ismeta(c)       (((c)&M_QUOTE) != 0)


static int       compare(const void *, const void *);
static int       g_Ctoc(const Char *, char *, size_t);
static int       g_lstat(Char *, __gl_stat_t  *, glob_t *);
static DIR      *g_opendir(Char *, glob_t *);
static Char     *g_strchr(const Char *, int);
static int       g_stat(Char *, __gl_stat_t *, glob_t *);
static int       glob0(const Char *, glob_t *, struct glob_limit *);
static int       glob1(Char *, glob_t *, struct glob_limit *);
static int       glob2(Char *, Char *, Char *, const Char *, glob_t *,
    struct glob_limit *);
static int       glob3(Char *, Char *, Char *, const Char *, const Char *,
    const Char *, glob_t *, struct glob_limit *);
static int       globextend(const Char *, glob_t *, struct glob_limit *);
static int       globtilde(const Char **, const Char *, Char *, size_t,
    glob_t *);
static int       globexp1(const Char *, glob_t *, struct glob_limit *);
static int       globexp2(const Char *, const Char *, glob_t *, int *,
    struct glob_limit *);
static int       match(const Char *, const Char *, const Char *);
#ifdef DEBUG
static void      qprintf(const char *, Char *);
#endif

int
glob(const char * __restrict pattern, int flags, int (*errfunc)(const char *,
    int), glob_t * __restrict pglob)
{
        const unsigned char *patnext;
        int c;
        Char *bufnext, *bufend, patbuf[MAXPATHLEN+1];
        struct glob_limit limit = { 0, 0, 0, 0 };

        _DIAGASSERT(pattern != NULL);

        patnext = (const unsigned char *) pattern;
        if (!(flags & GLOB_APPEND)) {
                pglob->gl_pathc = 0;
                pglob->gl_pathv = NULL;
                if (!(flags & GLOB_DOOFFS))
                        pglob->gl_offs = 0;
        }
        pglob->gl_flags = flags & ~GLOB_MAGCHAR;
        pglob->gl_errfunc = errfunc;
        pglob->gl_matchc = 0;

        bufnext = patbuf;
        bufend = bufnext + MAXPATHLEN;
        if (flags & GLOB_NOESCAPE) {
                while (bufnext < bufend && (c = *patnext++) != EOS) 
                        *bufnext++ = c;
        } else {
                /* Protect the quoted characters. */
                while (bufnext < bufend && (c = *patnext++) != EOS) 
                        if (c == QUOTE) {
                                if ((c = *patnext++) == EOS) {
                                        c = QUOTE;
                                        --patnext;
                                }
                                *bufnext++ = c | M_PROTECT;
                        }
                        else
                                *bufnext++ = c;
        }
        *bufnext = EOS;

        if (flags & GLOB_BRACE)
            return globexp1(patbuf, pglob, &limit);
        else
            return glob0(patbuf, pglob, &limit);
}

/*
 * Expand recursively a glob {} pattern. When there is no more expansion
 * invoke the standard globbing routine to glob the rest of the magic
 * characters
 */
static int
globexp1(const Char *pattern, glob_t *pglob, struct glob_limit *limit)
{
        const Char* ptr = pattern;
        int rv;

        _DIAGASSERT(pattern != NULL);
        _DIAGASSERT(pglob != NULL);

        if ((pglob->gl_flags & GLOB_LIMIT) &&
            limit->l_brace++ >= GLOB_LIMIT_BRACE) {
                errno = 0;
                return GLOB_NOSPACE;
        }

        /* Protect a single {}, for find(1), like csh */
        if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
                return glob0(pattern, pglob, limit);

        while ((ptr = (const Char *) g_strchr(ptr, LBRACE)) != NULL)
                if (!globexp2(ptr, pattern, pglob, &rv, limit))
                        return rv;

        return glob0(pattern, pglob, limit);
}


/*
 * Recursive brace globbing helper. Tries to expand a single brace.
 * If it succeeds then it invokes globexp1 with the new pattern.
 * If it fails then it tries to glob the rest of the pattern and returns.
 */
static int
globexp2(const Char *ptr, const Char *pattern, glob_t *pglob, int *rv,
    struct glob_limit *limit)
{
        int     i;
        Char   *lm, *ls;
        const Char *pe, *pm, *pl;
        Char    patbuf[MAXPATHLEN + 1];

        _DIAGASSERT(ptr != NULL);
        _DIAGASSERT(pattern != NULL);
        _DIAGASSERT(pglob != NULL);
        _DIAGASSERT(rv != NULL);

        /* copy part up to the brace */
        for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
                continue;
        ls = lm;

        /* Find the balanced brace */
        for (i = 0, pe = ++ptr; *pe; pe++)
                if (*pe == LBRACKET) {
                        /* Ignore everything between [] */
                        for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
                                continue;
                        if (*pe == EOS) {
                                /* 
                                 * We could not find a matching RBRACKET.
                                 * Ignore and just look for RBRACE
                                 */
                                pe = pm;
                        }
                }
                else if (*pe == LBRACE)
                        i++;
                else if (*pe == RBRACE) {
                        if (i == 0)
                                break;
                        i--;
                }

        /* Non matching braces; just glob the pattern */
        if (i != 0 || *pe == EOS) {
                /*
                 * we use `pattern', not `patbuf' here so that that
                 * unbalanced braces are passed to the match
                 */
                *rv = glob0(pattern, pglob, limit);
                return 0;
        }

        for (i = 0, pl = pm = ptr; pm <= pe; pm++) {
                switch (*pm) {
                case LBRACKET:
                        /* Ignore everything between [] */
                        for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
                                continue;
                        if (*pm == EOS) {
                                /* 
                                 * We could not find a matching RBRACKET.
                                 * Ignore and just look for RBRACE
                                 */
                                pm = pl;
                        }
                        break;

                case LBRACE:
                        i++;
                        break;

                case RBRACE:
                        if (i) {
                                i--;
                                break;
                        }
                        /* FALLTHROUGH */
                case COMMA:
                        if (i && *pm == COMMA)
                                break;
                        else {
                                /* Append the current string */
                                for (lm = ls; (pl < pm); *lm++ = *pl++)
                                        continue;
                                /* 
                                 * Append the rest of the pattern after the
                                 * closing brace
                                 */
                                for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
                                        continue;

                                /* Expand the current pattern */
#ifdef DEBUG
                                qprintf("globexp2", patbuf);
#endif
                                *rv = globexp1(patbuf, pglob, limit);

                                /* move after the comma, to the next string */
                                pl = pm + 1;
                        }
                        break;

                default:
                        break;
                }
        }
        *rv = 0;
        return 0;
}



/*
 * expand tilde from the passwd file.
 */
static int
globtilde(const Char **qpatnext, const Char *pattern, Char *patbuf,
    size_t patsize, glob_t *pglob)
{
        struct passwd *pwd;
        const char *h;
        const Char *p;
        Char *b;
        char *d;
        Char *pend = &patbuf[patsize / sizeof(Char)];
#ifndef NO_GETPW_R
        struct passwd pwres;
        char pwbuf[1024];
#endif

        pend--;

        _DIAGASSERT(pattern != NULL);
        _DIAGASSERT(patbuf != NULL);
        _DIAGASSERT(pglob != NULL);
        *qpatnext = pattern;

        if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
                return 0;

        /* Copy up to the end of the string or / */
        for (p = pattern + 1, d = (char *)(void *)patbuf; 
             d < (char *)(void *)pend && *p && *p != SLASH; 
             *d++ = *p++)
                continue;

        if (d == (char *)(void *)pend)
                return GLOB_ABEND;

        *d = EOS;
        d = (char *)(void *)patbuf;

        if (*d == EOS) {
                /* 
                 * handle a plain ~ or ~/ by expanding $HOME 
                 * first and then trying the password file
                 */
                if ((h = getenv("HOME")) == NULL) {
#ifdef NO_GETPW_R
                        if ((pwd = getpwuid(getuid())) == NULL)
#else
                        if (getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf),
                            &pwd) != 0 || pwd == NULL)
#endif
                                goto nouser;
                        h = pwd->pw_dir;
                }
        }
        else {
                /*
                 * Expand a ~user
                 */
#ifdef NO_GETPW_R
                if ((pwd = getpwnam(d)) == NULL)
#else
                if (getpwnam_r(d, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 ||
                    pwd == NULL)
#endif
                        goto nouser;
                h = pwd->pw_dir;
        }

        /* Copy the home directory */
        for (b = patbuf; b < pend && *h; *b++ = *h++)
                continue;

        if (b == pend)
                return GLOB_ABEND;
        
        /* Append the rest of the pattern */
        while (b < pend && (*b++ = *p++) != EOS)
                continue;

        if (b == pend)
                return GLOB_ABEND;

        *qpatnext = patbuf;
        return 0;
nouser:
        return (pglob->gl_flags & GLOB_TILDE_CHECK) ?  GLOB_NOMATCH : 0;
}
        

/*
 * The main glob() routine: compiles the pattern (optionally processing
 * quotes), calls glob1() to do the real pattern matching, and finally
 * sorts the list (unless unsorted operation is requested).  Returns 0
 * if things went well, nonzero if errors occurred.  It is not an error
 * to find no matches.
 */
static int
glob0(const Char *pattern, glob_t *pglob, struct glob_limit *limit)
{
        const Char *qpatnext;
        int c, error;
        __gl_size_t oldpathc;
        Char *bufnext, patbuf[MAXPATHLEN+1];

        _DIAGASSERT(pattern != NULL);
        _DIAGASSERT(pglob != NULL);

        if ((error = globtilde(&qpatnext, pattern, patbuf, sizeof(patbuf),
            pglob)) != 0)
                return error;
        oldpathc = pglob->gl_pathc;
        bufnext = patbuf;

        /* We don't need to check for buffer overflow any more. */
        while ((c = *qpatnext++) != EOS) {
                switch (c) {
                case LBRACKET:
                        c = *qpatnext;
                        if (c == NOT)
                                ++qpatnext;
                        if (*qpatnext == EOS ||
                            g_strchr(qpatnext+1, RBRACKET) == NULL) {
                                *bufnext++ = LBRACKET;
                                if (c == NOT)
                                        --qpatnext;
                                break;
                        }
                        *bufnext++ = M_SET;
                        if (c == NOT)
                                *bufnext++ = M_NOT;
                        c = *qpatnext++;
                        do {
                                *bufnext++ = CHAR(c);
                                if (*qpatnext == RANGE &&
                                    (c = qpatnext[1]) != RBRACKET) {
                                        *bufnext++ = M_RNG;
                                        *bufnext++ = CHAR(c);
                                        qpatnext += 2;
                                }
                        } while ((c = *qpatnext++) != RBRACKET);
                        pglob->gl_flags |= GLOB_MAGCHAR;
                        *bufnext++ = M_END;
                        break;
                case QUESTION:
                        pglob->gl_flags |= GLOB_MAGCHAR;
                        *bufnext++ = M_ONE;
                        break;
                case STAR:
                        pglob->gl_flags |= GLOB_MAGCHAR;
                        /* collapse adjacent stars to one [or three if globstar]
                         * to avoid exponential behavior
                         */
                        if (bufnext == patbuf || bufnext[-1] != M_ALL ||
                            ((pglob->gl_flags & GLOB_STAR) != 0 && 
                            (bufnext - 1 == patbuf || bufnext[-2] != M_ALL ||
                            bufnext - 2 == patbuf || bufnext[-3] != M_ALL)))
                                *bufnext++ = M_ALL;
                        break;
                default:
                        *bufnext++ = CHAR(c);
                        break;
                }
        }
        *bufnext = EOS;
#ifdef DEBUG
        qprintf("glob0", patbuf);
#endif

        if ((error = glob1(patbuf, pglob, limit)) != 0)
                return error;

        if (pglob->gl_pathc == oldpathc) {      
                /*
                 * If there was no match we are going to append the pattern 
                 * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was
                 * specified and the pattern did not contain any magic
                 * characters GLOB_NOMAGIC is there just for compatibility
                 * with csh.
                 */
                if ((pglob->gl_flags & GLOB_NOCHECK) ||
                    ((pglob->gl_flags & (GLOB_NOMAGIC|GLOB_MAGCHAR))
                     == GLOB_NOMAGIC)) {
                        return globextend(pattern, pglob, limit);
                } else {
                        return GLOB_NOMATCH;
                }
        } else if (!(pglob->gl_flags & GLOB_NOSORT)) {
                qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
                    (size_t)pglob->gl_pathc - oldpathc, sizeof(char *),
                    compare);
        }

        return 0;
}

static int
compare(const void *p, const void *q)
{

        _DIAGASSERT(p != NULL);
        _DIAGASSERT(q != NULL);

        return strcoll(*(const char * const *)p, *(const char * const *)q);
}

static int
glob1(Char *pattern, glob_t *pglob, struct glob_limit *limit)
{
        Char pathbuf[MAXPATHLEN+1];

        _DIAGASSERT(pattern != NULL);
        _DIAGASSERT(pglob != NULL);

        /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
        if (*pattern == EOS)
                return 0;
        /*
         * we save one character so that we can use ptr >= limit,
         * in the general case when we are appending non nul chars only.
         */
        return glob2(pathbuf, pathbuf,
            pathbuf + (sizeof(pathbuf) / sizeof(*pathbuf)) - 1, pattern,
            pglob, limit);
}

/*
 * The functions glob2 and glob3 are mutually recursive; there is one level
 * of recursion for each segment in the pattern that contains one or more
 * meta characters.
 */
static int
glob2(Char *pathbuf, Char *pathend, Char *pathlim, const Char *pattern,
    glob_t *pglob, struct glob_limit *limit)
{
        __gl_stat_t sb;
        const Char *p;
        Char *q;
        int anymeta;

        _DIAGASSERT(pathbuf != NULL);
        _DIAGASSERT(pathend != NULL);
        _DIAGASSERT(pattern != NULL);
        _DIAGASSERT(pglob != NULL);

#ifdef DEBUG
        qprintf("glob2", pathbuf);
#endif
        /*
         * Loop over pattern segments until end of pattern or until
         * segment with meta character found.
         */
        for (anymeta = 0;;) {
                if (*pattern == EOS) {          /* End of pattern? */
                        *pathend = EOS;
                        if (g_lstat(pathbuf, &sb, pglob))
                                return 0;
                
                        if ((pglob->gl_flags & GLOB_LIMIT) &&
                            limit->l_stat++ >= GLOB_LIMIT_STAT) {
                                errno = 0;
                                *pathend++ = SEP;
                                *pathend = EOS;
                                return GLOB_NOSPACE;
                        }
                        if (((pglob->gl_flags & GLOB_MARK) &&
                            pathend[-1] != SEP) && (S_ISDIR(sb.st_mode) ||
                            (S_ISLNK(sb.st_mode) &&
                            (g_stat(pathbuf, &sb, pglob) == 0) &&
                            S_ISDIR(sb.st_mode)))) {
                                if (pathend >= pathlim)
                                        return GLOB_ABORTED;
                                *pathend++ = SEP;
                                *pathend = EOS;
                        }
                        ++pglob->gl_matchc;
                        return globextend(pathbuf, pglob, limit);
                }

                /* Find end of next segment, copy tentatively to pathend. */
                q = pathend;
                p = pattern;
                while (*p != EOS && *p != SEP) {
                        if (ismeta(*p))
                                anymeta = 1;
                        if (q >= pathlim)
                                return GLOB_ABORTED;
                        *q++ = *p++;
                }

                if (!anymeta) {
                        pathend = q;
                        pattern = p;
                        while (*pattern == SEP) {
                                if (pathend >= pathlim)
                                        return GLOB_ABORTED;
                                *pathend++ = *pattern++;
                        }
                } else                  /* Need expansion, recurse. */
                        return glob3(pathbuf, pathend, pathlim, pattern, p,
                            pattern, pglob, limit);
        }
        /* NOTREACHED */
}

static int
glob3(Char *pathbuf, Char *pathend, Char *pathlim, const Char *pattern,
    const Char *restpattern, const Char *pglobstar, glob_t *pglob,
    struct glob_limit *limit)
{
        struct dirent *dp;
        DIR *dirp;
        __gl_stat_t sbuf;
        int error;
        char buf[MAXPATHLEN];
        int globstar = 0;
        int chase_symlinks = 0;
        const Char *termstar = NULL;

        /*
         * The readdirfunc declaration can't be prototyped, because it is
         * assigned, below, to two functions which are prototyped in glob.h
         * and dirent.h as taking pointers to differently typed opaque
         * structures.
         */
        struct dirent *(*readdirfunc)(void *);

        _DIAGASSERT(pathbuf != NULL);
        _DIAGASSERT(pathend != NULL);
        _DIAGASSERT(pattern != NULL);
        _DIAGASSERT(restpattern != NULL);
        _DIAGASSERT(pglob != NULL);

        *pathend = EOS;
        errno = 0;
            
        while (pglobstar < restpattern) {
                if ((pglobstar[0] & M_MASK) == M_ALL &&
                    (pglobstar[1] & M_MASK) == M_ALL) {
                        globstar = 1;
                        chase_symlinks = (pglobstar[2] & M_MASK) == M_ALL;
                        termstar = pglobstar + (2 + chase_symlinks);
                        break;
                }
                pglobstar++;
        } 

        if (globstar) {
                error = pglobstar == pattern && termstar == restpattern ?
                    *restpattern == EOS ?
                    glob2(pathbuf, pathend, pathlim, restpattern - 1, pglob,
                    limit) :
                    glob2(pathbuf, pathend, pathlim, restpattern + 1, pglob,
                    limit) :
                    glob3(pathbuf, pathend, pathlim, pattern, restpattern,
                    termstar, pglob, limit);
                if (error)
                        return error;
                *pathend = EOS;
        }

        if (*pathbuf && (g_lstat(pathbuf, &sbuf, pglob) ||
            !S_ISDIR(sbuf.st_mode)
#ifdef S_IFLINK
             && ((globstar && !chase_symlinks) || !S_ISLNK(sbuf.st_mode))
#endif
            ))
                return 0;

        if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
                if (pglob->gl_errfunc) {
                        if (g_Ctoc(pathbuf, buf, sizeof(buf)))
                                return GLOB_ABORTED;
                        if (pglob->gl_errfunc(buf, errno) ||
                            pglob->gl_flags & GLOB_ERR)
                                return GLOB_ABORTED;
                }
                /*
                 * Posix/XOpen: glob should return when it encounters a
                 * directory that it cannot open or read
                 * XXX: Should we ignore ENOTDIR and ENOENT though?
                 * I think that Posix had in mind EPERM...
                 */
                if (pglob->gl_flags & GLOB_ERR)
                        return GLOB_ABORTED;

                return 0;
        }

        error = 0;

        /* Search directory for matching names. */
        if (pglob->gl_flags & GLOB_ALTDIRFUNC)
                readdirfunc = pglob->gl_readdir;
        else
                readdirfunc = (struct dirent *(*)(void *)) readdir;
        while ((dp = (*readdirfunc)(dirp)) != NULL) {
                unsigned char *sc;
                Char *dc;

                if ((pglob->gl_flags & GLOB_LIMIT) &&
                    limit->l_readdir++ >= GLOB_LIMIT_READDIR) {
                        errno = 0;
                        *pathend++ = SEP;
                        *pathend = EOS;
                        error = GLOB_NOSPACE;
                        break;
                }

                /*
                 * Initial DOT must be matched literally, unless we have
                 * GLOB_PERIOD set.
                 */
                if ((pglob->gl_flags & GLOB_PERIOD) == 0)
                        if (dp->d_name[0] == DOT && *pattern != DOT)
                                continue;
                /*
                 * If GLOB_NO_DOTDIRS is set, . and .. vanish.
                 */
                if ((pglob->gl_flags & GLOB_NO_DOTDIRS) &&
                    (dp->d_name[0] == DOT) &&
                    ((dp->d_name[1] == EOS) ||
                     ((dp->d_name[1] == DOT) && (dp->d_name[2] == EOS))))
                        continue;
                /*
                 * The resulting string contains EOS, so we can
                 * use the pathlim character, if it is the nul
                 */
                for (sc = (unsigned char *) dp->d_name, dc = pathend; 
                     dc <= pathlim && (*dc++ = *sc++) != EOS;)
                        continue;

                /*
                 * Have we filled the buffer without seeing EOS?
                 */
                if (dc > pathlim && *pathlim != EOS) {
                        /*
                         * Abort when requested by caller, otherwise
                         * reset pathend back to last SEP and continue
                         * with next dir entry.
                         */
                        if (pglob->gl_flags & GLOB_ERR) {
                                error = GLOB_ABORTED;
                                break;
                        }
                        else {
                                *pathend = EOS;
                                continue;
                        }
                }

                if (globstar) {
#ifdef S_IFLNK
                        if (!chase_symlinks &&
                            (g_lstat(pathbuf, &sbuf, pglob) ||
                            S_ISLNK(sbuf.st_mode)))
                                continue;
#endif

                        if (!match(pathend, pattern, termstar))
                                continue;
            
                        if (--dc < pathlim - 2)
                                *dc++ = SEP;
                        *dc = EOS;
                        error = glob2(pathbuf, dc, pathlim, pglobstar,
                            pglob, limit);
                        if (error)
                                break;
                        *pathend = EOS;
                } else {
                        if (!match(pathend, pattern, restpattern)) {
                                *pathend = EOS;
                                continue;
                        }
                        error = glob2(pathbuf, --dc, pathlim, restpattern,
                            pglob, limit);
                        if (error)
                                break;
                }
        }
        if (pglob->gl_flags & GLOB_ALTDIRFUNC)
                (*pglob->gl_closedir)(dirp);
        else
                closedir(dirp);

        /*
         * Again Posix X/Open issue with regards to error handling.
         */
        if ((error || errno) && (pglob->gl_flags & GLOB_ERR))
                return GLOB_ABORTED;

        return error;
}


/*
 * Extend the gl_pathv member of a glob_t structure to accommodate a new item,
 * add the new item, and update gl_pathc.
 *
 * This assumes the BSD realloc, which only copies the block when its size
 * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 * behavior.
 *
 * Return 0 if new item added, error code if memory couldn't be allocated.
 *
 * Invariant of the glob_t structure:
 *      Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 *      gl_pathv points to (gl_offs + gl_pathc + 1) items.
 */
static int
globextend(const Char *path, glob_t *pglob, struct glob_limit *limit)
{
        char **pathv;
        size_t i, newsize, len;
        char *copy;
        const Char *p;

        _DIAGASSERT(path != NULL);
        _DIAGASSERT(pglob != NULL);

        newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
        if ((pglob->gl_flags & GLOB_LIMIT) &&
            newsize > GLOB_LIMIT_PATH * sizeof(*pathv))
                goto nospace;
        pathv = pglob->gl_pathv ? realloc(pglob->gl_pathv, newsize) :
            malloc(newsize);
        if (pathv == NULL)
                return GLOB_NOSPACE;

        if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
                /* first time around -- clear initial gl_offs items */
                pathv += pglob->gl_offs;
                for (i = pglob->gl_offs + 1; --i > 0; )
                        *--pathv = NULL;
        }
        pglob->gl_pathv = pathv;

        for (p = path; *p++;)
                continue;
        len = (size_t)(p - path);
        limit->l_string += len;
        if ((copy = malloc(len)) != NULL) {
                if (g_Ctoc(path, copy, len)) {
                        free(copy);
                        return GLOB_ABORTED;
                }
                pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
        }
        pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;

        if ((pglob->gl_flags & GLOB_LIMIT) &&
            (newsize + limit->l_string) >= GLOB_LIMIT_STRING)
                goto nospace;

        return copy == NULL ? GLOB_NOSPACE : 0;
nospace:
        errno = 0;
        return GLOB_NOSPACE;
}


/*
 * pattern matching function for filenames.
 */
static int
match(const Char *name, const Char *pat, const Char *patend)
{
        int ok, negate_range;
        Char c, k;
        const Char *patNext, *nameNext, *nameStart, *nameEnd;

        _DIAGASSERT(name != NULL);
        _DIAGASSERT(pat != NULL);
        _DIAGASSERT(patend != NULL);
        patNext = pat;
        nameStart = nameNext = name;
        nameEnd = NULL;

        while (pat < patend || *name) {
                c = *pat;
                if (*name == EOS)
                        nameEnd = name;
                switch (c & M_MASK) {
                case M_ALL:
                        while ((pat[1] & M_MASK) == M_ALL) pat++;
                        patNext = pat;
                        nameNext = name + 1;
                        pat++;
                        continue;
                case M_ONE:
                        if (*name == EOS)
                                break;
                        pat++;
                        name++;
                        continue;
                case M_SET:
                        ok = 0;
                        if ((k = *name) == EOS)
                                break;
                        pat++;
                        name++;
                        if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
                                ++pat;
                        while (((c = *pat++) & M_MASK) != M_END)
                                if ((*pat & M_MASK) == M_RNG) {
                                        if (c <= k && k <= pat[1])
                                                ok = 1;
                                        pat += 2;
                                } else if (c == k)
                                        ok = 1;
                        if (ok == negate_range)
                                break;
                        continue;
                default:
                        if (*name != c)
                                break;
                        pat++;
                        name++;
                        continue;
                }
                if (nameNext != nameStart
                    && (nameEnd == NULL || nameNext <= nameEnd)) {
                        pat = patNext;
                        name = nameNext;
                        continue;
                }
                return 0;
        }
        return 1;
}

/* Free allocated data belonging to a glob_t structure. */
void
globfree(glob_t *pglob)
{
        size_t i;
        char **pp;

        _DIAGASSERT(pglob != NULL);

        if (pglob->gl_pathv != NULL) {
                pp = pglob->gl_pathv + pglob->gl_offs;
                for (i = pglob->gl_pathc; i--; ++pp)
                        if (*pp)
                                free(*pp);
                free(pglob->gl_pathv);
                pglob->gl_pathv = NULL;
                pglob->gl_pathc = 0;
        }
}

#ifndef __LIBC12_SOURCE__
int
glob_pattern_p(const char *pattern, int quote)
{
        int range = 0;

        for (; *pattern; pattern++)
                switch (*pattern) {
                case QUESTION:
                case STAR:
                        return 1;

                case QUOTE:
                        if (quote && pattern[1] != EOS)
                              ++pattern;
                        break;

                case LBRACKET:
                        range = 1;
                        break;

                case RBRACKET:
                        if (range)
                              return 1;
                        break;
                default:
                        break;
                }

          return 0;
}
#endif

static DIR *
g_opendir(Char *str, glob_t *pglob)
{
        char buf[MAXPATHLEN];

        _DIAGASSERT(str != NULL);
        _DIAGASSERT(pglob != NULL);

        if (!*str)
                (void)strlcpy(buf, ".", sizeof(buf));
        else {
                if (g_Ctoc(str, buf, sizeof(buf)))
                        return NULL;
        }

        if (pglob->gl_flags & GLOB_ALTDIRFUNC)
                return (*pglob->gl_opendir)(buf);

        return opendir(buf);
}

static int
g_lstat(Char *fn, __gl_stat_t *sb, glob_t *pglob)
{
        char buf[MAXPATHLEN];

        _DIAGASSERT(fn != NULL);
        _DIAGASSERT(sb != NULL);
        _DIAGASSERT(pglob != NULL);

        if (g_Ctoc(fn, buf, sizeof(buf)))
                return -1;
        if (pglob->gl_flags & GLOB_ALTDIRFUNC)
                return (*pglob->gl_lstat)(buf, sb);
        return lstat(buf, sb);
}

static int
g_stat(Char *fn, __gl_stat_t *sb, glob_t *pglob)
{
        char buf[MAXPATHLEN];

        _DIAGASSERT(fn != NULL);
        _DIAGASSERT(sb != NULL);
        _DIAGASSERT(pglob != NULL);

        if (g_Ctoc(fn, buf, sizeof(buf)))
                return -1;
        if (pglob->gl_flags & GLOB_ALTDIRFUNC)
                return (*pglob->gl_stat)(buf, sb);
        return stat(buf, sb);
}

static Char *
g_strchr(const Char *str, int ch)
{

        _DIAGASSERT(str != NULL);

        do {
                if (*str == ch)
                        return __UNCONST(str);
        } while (*str++);
        return NULL;
}

static int
g_Ctoc(const Char *str, char *buf, size_t len)
{
        char *dc;

        _DIAGASSERT(str != NULL);
        _DIAGASSERT(buf != NULL);

        if (len == 0)
                return 1;

        for (dc = buf; len && (*dc++ = *str++) != EOS; len--)
                continue;

        return len == 0;
}

#ifdef DEBUG
static void 
qprintf(const char *str, Char *s)
{
        Char *p;

        _DIAGASSERT(str != NULL);
        _DIAGASSERT(s != NULL);

        (void)printf("%s:\n", str);
        for (p = s; *p; p++)
                (void)printf("%c", CHAR(*p));
        (void)printf("\n");
        for (p = s; *p; p++)
                (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
        (void)printf("\n");
        for (p = s; *p; p++)
                (void)printf("%c", ismeta(*p) ? '_' : ' ');
        (void)printf("\n");
}
#endif