/*
 * 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.
 * 4. 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.
 */

#ifdef __CYGWIN__
#include "winsup.h"
#endif

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)glob.c	8.3 (Berkeley) 10/13/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/gen/glob.c,v 1.28 2010/05/12 17:44:00 gordon Exp $");

/*
 * 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_QUOTE:
 *	Escaping convention: \ inhibits any special meaning the following
 *	character might have (except \ at end of string is retained).
 * 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
 * gl_matchc:
 *	Number of matches in the current invocation of glob.
 */

/*
 * Some notes on multibyte character support:
 * 1. Patterns with illegal byte sequences match nothing - even if
 *    GLOB_NOCHECK is specified.
 * 2. Illegal byte sequences in filenames are handled by treating them as
 *    single-byte characters with a value of the first byte of the sequence
 *    cast to wint_t.
 * 3. State-dependent encodings are not currently supported.
 */

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

#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <glob.h>
#include <limits.h>
#include <pwd.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wchar.h>
#include <wctype.h>

#include "collate.h"

#ifdef __CYGWIN__
#define Cchar(c)	(ignore_case_with_glob ? towlower (c) : (c))
#endif

#undef MAXPATHLEN
#define MAXPATHLEN 8192

#define	DOLLAR		'$'
#define	DOT		'.'
#define	COLON		':'
#define	EQUALS		'='
#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 DEBUG

#define	M_QUOTE		0x40000000U
#define	M_PROTECT	0x20000000U
#define	M_MASK		0x70ffffffU
#define	M_COLL_MASK	0x700000ffU
#define	M_CHAR		0x00ffffffU

typedef wint_t Char;

#else

#define	M_QUOTE		0x80
#define	M_PROTECT	0x40
#define	M_MASK		0xff
#define	M_CHAR		0x7f

typedef char Char;

#endif


#define	CHAR(c)		((Char)((c)&M_CHAR))
#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	M_NAMED		META(':')
#define	M_EQUIV		META('=')
#define	M_COLL(_ccnt)	META('.' | ((_ccnt) << 8))
#define M_COLL_P(_c)	(((_c) & M_COLL_MASK) == META('.'))
#define M_COLL_CNT(_c)	(((_c) & ~M_COLL_MASK) >> 8)
#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 *, struct stat *, glob_t *);
static DIR	*g_opendir(Char *, glob_t *);
static const Char *g_strchr(const Char *, wint_t);
#ifdef notdef
static Char	*g_strcat(Char *, const Char *);
#endif
static int	 g_stat(Char *, struct stat *, glob_t *);
static int	 glob0(const Char *, glob_t *, size_t *);
static int	 glob1(Char *, glob_t *, size_t *);
static int	 glob2(Char *, Char *, Char *, Char *, glob_t *, size_t *);
static int	 glob3(Char *, Char *, Char *, Char *, Char *, glob_t *, size_t *);
static int	 globextend(const Char *, glob_t *, size_t *);
static const Char *
		 globtilde(const Char *, Char *, size_t, glob_t *);
static int	 globexp1(const Char *, glob_t *, size_t *);
static int	 globexp2(const Char *, const Char *, glob_t *, int *, size_t *);
static int	 match(Char *, Char *, Char *);
#ifdef DEBUG
static void	 qprintf(const char *, Char *);
#endif

/* Return value is either EOS, COLON, DOT, EQUALS, or LBRACKET if no class
   expression found. */
static inline Char
check_classes_expr(const Char *&cptr, wint_t *classbuf = NULL,
		   size_t classbufsize = 0)
{
	const Char *ctype = NULL;

	if (*cptr == LBRACKET &&
	    (cptr[1] == COLON || cptr[1] == DOT || cptr[1] == EQUALS)) {
		ctype = ++cptr;
		while (*++cptr != EOS &&
		       (*cptr != *ctype || cptr[1] != RBRACKET))
			;
		if (*cptr == EOS)
			return EOS;
		if (classbuf) {
			const Char *class_p = ctype + 1;
			size_t clen = cptr - class_p;

			if (clen < classbufsize)
				*wcipncpy (classbuf, class_p, clen) = '\0';
			else
				ctype = NULL;
		}
		cptr++; /* Advance cptr to closing RBRACKET of class expr */
	}
	return ctype ? *ctype : LBRACKET;
}

int
glob(const char *__restrict pattern, int flags, int (*errfunc)(const char *, int), glob_t *__restrict pglob)
{
	const char *patnext;
	size_t limit;
	Char *bufnext, *bufend, patbuf[MAXPATHLEN], prot;
	mbstate_t mbs;
	wint_t wc;
	size_t clen;

	patnext = pattern;
	if (!(flags & GLOB_APPEND)) {
		pglob->gl_pathc = 0;
		pglob->gl_pathv = NULL;
		if (!(flags & GLOB_DOOFFS))
			pglob->gl_offs = 0;
	}
	if (flags & GLOB_LIMIT) {
		limit = pglob->gl_matchc;
		if (limit == 0)
			limit = ARG_MAX;
	} else
		limit = 0;
	pglob->gl_flags = flags & ~GLOB_MAGCHAR;
	pglob->gl_errfunc = errfunc;
	pglob->gl_matchc = 0;

	bufnext = patbuf;
	bufend = bufnext + MAXPATHLEN - 1;
	if (flags & GLOB_NOESCAPE) {
		memset(&mbs, 0, sizeof(mbs));
		while (bufend - bufnext >= MB_CUR_MAX) {
			clen = mbrtowi(&wc, patnext, MB_LEN_MAX, &mbs);
			if (clen == (size_t)-1 || clen == (size_t)-2)
				return (GLOB_NOMATCH);
			else if (clen == 0)
				break;
			*bufnext++ = wc;
			patnext += clen;
		}
	} else {
		/* Protect the quoted characters. */
		memset(&mbs, 0, sizeof(mbs));
		while (bufend - bufnext >= MB_CUR_MAX) {
			if (*patnext == QUOTE) {
				if (*++patnext == EOS) {
					*bufnext++ = QUOTE | M_PROTECT;
					continue;
				}
				prot = M_PROTECT;
			} else
				prot = 0;
			clen = mbrtowi(&wc, patnext, MB_LEN_MAX, &mbs);
			if (clen == (size_t)-1 || clen == (size_t)-2)
				return (GLOB_NOMATCH);
			else if (clen == 0)
				break;
			*bufnext++ = wc | prot;
			patnext += clen;
		}
	}
	*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, size_t *limit)
{
	const Char* ptr = pattern;
	int rv;

	/* 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 = 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, size_t *limit)
{
	int     i;
	Char   *lm, *ls;
	const Char *pe, *pm, *pm1, *pl;
	Char    patbuf[MAXPATHLEN];

	/* copy part up to the brace */
	for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
		continue;
	*lm = EOS;
	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++) {
				if (check_classes_expr (pe) == EOS)
					break;
			}
			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) {
		*rv = glob0(patbuf, pglob, limit);
		return 0;
	}

	for (i = 0, pl = pm = ptr; pm <= pe; pm++)
		switch (*pm) {
		case LBRACKET:
			/* Ignore everything between [] */
			for (pm1 = pm++; *pm != RBRACKET && *pm != EOS; pm++) {
				if (check_classes_expr (pm) == EOS)
					break;
			}
			if (*pm == EOS) {
				/*
				 * We could not find a matching RBRACKET.
				 * Ignore and just look for RBRACE
				 */
				pm = pm1;
			}
			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 const Char *
globtilde(const Char *pattern, Char *patbuf, size_t patbuf_len, glob_t *pglob)
{
	struct passwd *pwd;
	char *h;
	const Char *p;
	Char *b, *eb;

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

	/*
	 * Copy up to the end of the string or /
	 */
	eb = &patbuf[patbuf_len - 1];
	for (p = pattern + 1, h = (char *) patbuf;
	    h < (char *)eb && *p && *p != SLASH; *h++ = *p++)
		continue;

	*h = EOS;

	if (((char *) patbuf)[0] == EOS) {
		/*
		 * handle a plain ~ or ~/ by expanding $HOME first (iff
		 * we're not running setuid or setgid) and then trying
		 * the password file
		 */
		if (issetugid() != 0 ||
		    (h = getenv("HOME")) == NULL) {
			if (((h = getlogin()) != NULL &&
			     (pwd = getpwnam(h)) != NULL) ||
			    (pwd = getpwuid(getuid())) != NULL)
				h = pwd->pw_dir;
			else
				return pattern;
		}
	}
	else {
		/*
		 * Expand a ~user
		 */
		if ((pwd = getpwnam((char*) patbuf)) == NULL)
			return pattern;
		else
			h = pwd->pw_dir;
	}

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

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

	return patbuf;
}

/*
 * 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.
 */
static int
glob0(const Char *pattern, glob_t *pglob, size_t *limit)
{
	const Char *qpatnext, *qpatrbsrch;
	int err;
	size_t oldpathc;
	Char *bufnext, c, patbuf[MAXPATHLEN];

	qpatnext = globtilde(pattern, patbuf, MAXPATHLEN, pglob);
	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;
			for (qpatrbsrch = qpatnext;
			     *qpatrbsrch != RBRACKET && *qpatrbsrch != EOS;
			     ++qpatrbsrch) {
				if (check_classes_expr (qpatrbsrch) == EOS)
					break;
			}
			if (*qpatrbsrch == EOS) {
				*bufnext++ = LBRACKET;
				if (c == NOT)
					--qpatnext;
				break;
			}
			*bufnext++ = M_SET;
			if (c == NOT)
				*bufnext++ = M_NOT;
			c = *qpatnext++;
			do {
				wint_t wclass[64];
				Char ctype;

				ctype = check_classes_expr(--qpatnext, wclass,
							   64);
				++qpatnext;
				if (ctype == COLON) {
					wctype_t type;
					char cclass[64];

					/* No worries, char classes are
					   ASCII-only anyway */
					wcitoascii (cclass, wclass);
					if ((type = wctype (cclass))) {
					    *bufnext++ = M_NAMED;
					    *bufnext++ = CHAR (type);
					}
					continue;
				}
				if (ctype == EQUALS) {
					if (wclass[0] && !wclass[1]) {
					    *bufnext++ = M_EQUIV;
					    *bufnext++ = CHAR (wclass[0]);
					}
					continue;
				}
				if (ctype == DOT &&
				    is_unicode_coll_elem (wclass)) {
					*bufnext++ =
					    M_COLL (wcilen (wclass));
					wint_t *wcp = wclass;
					while ((*bufnext++ = *wcp++))
					    ;
					--bufnext; /* drop NUL */
				} else
					*bufnext++ = CHAR(c);
				if (*qpatnext == RANGE &&
				    (c = qpatnext[1]) != RBRACKET) {
					*bufnext++ = M_RNG;

					ctype = check_classes_expr(++qpatnext,
								   wclass, 64);
					if (ctype == DOT &&
					    is_unicode_coll_elem (wclass)) {
						*bufnext++ =
						    M_COLL (wcilen (wclass));
						wint_t *wcp = wclass;
						while ((*bufnext++ = *wcp++))
						    ;
						--bufnext; /* drop NUL */
					} else
						*bufnext++ = CHAR(c);
					++qpatnext;
				}
			} 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,
			 * to avoid exponential behavior
			 */
			if (bufnext == patbuf || bufnext[-1] != M_ALL)
			    *bufnext++ = M_ALL;
			break;
		default:
			*bufnext++ = CHAR(c);
			break;
		}
	}
	*bufnext = EOS;
#ifdef DEBUG
	qprintf("glob0:", patbuf);
#endif

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

	/*
	 * 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_pathc == oldpathc) {
		if (((pglob->gl_flags & GLOB_NOCHECK) ||
		    ((pglob->gl_flags & GLOB_NOMAGIC) &&
			!(pglob->gl_flags & GLOB_MAGCHAR))))
			return(globextend(pattern, pglob, limit));
		else
			return(GLOB_NOMATCH);
	}
	if (!(pglob->gl_flags & GLOB_NOSORT))
		qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
		    pglob->gl_pathc - oldpathc, sizeof(char *), compare);
	return(0);
}

static int
compare(const void *p, const void *q)
{
	return(strcoll(*(char **)p, *(char **)q));
}

static int
glob1(Char *pattern, glob_t *pglob, size_t *limit)
{
	Char pathbuf[MAXPATHLEN];

	/* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
	if (*pattern == EOS)
		return(0);
	return(glob2(pathbuf, pathbuf, pathbuf + MAXPATHLEN - 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 *pathend_last, Char *pattern,
      glob_t *pglob, size_t *limit)
{
	struct stat sb;
	Char *p, *q;
	int anymeta;

	/*
	 * 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_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 + 1 > pathend_last)
					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 + 1 > pathend_last)
				return (GLOB_ABORTED);
			*q++ = *p++;
		}

		if (!anymeta) {		/* No expansion, do next segment. */
			pathend = q;
			pattern = p;
			while (*pattern == SEP) {
				if (pathend + 1 > pathend_last)
					return (GLOB_ABORTED);
				*pathend++ = *pattern++;
			}
		} else			/* Need expansion, recurse. */
			return(glob3(pathbuf, pathend, pathend_last, pattern, p,
			    pglob, limit));
	}
	/* NOTREACHED */
}

static int
glob3(Char *pathbuf, Char *pathend, Char *pathend_last,
      Char *pattern, Char *restpattern,
      glob_t *pglob, size_t *limit)
{
	struct dirent *dp;
	DIR *dirp;
	int err;
	char buf[MAXPATHLEN];

	/*
	 * 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.
	 * CYGWIN: Needs prototype and subsequently wild casting to avoid
	 * compiler error.
	 */
	struct dirent *(*readdirfunc)(void *);

	if (pathend > pathend_last)
		return (GLOB_ABORTED);
	*pathend = EOS;
	errno = 0;

	if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
		/* TODO: don't call for ENOENT or ENOTDIR? */
		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);
		}
		return(0);
	}

	err = 0;

	/* Search directory for matching names. */
	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
		readdirfunc = pglob->gl_readdir;
	else
		readdirfunc = (dirent*(*)(void*)) readdir;
	while ((dp = (*readdirfunc)(dirp))) {
		char *sc;
		Char *dc;
		wint_t wc;
		size_t clen;
		mbstate_t mbs;

		/* Initial DOT must be matched literally. */
		if (dp->d_name[0] == DOT && *pattern != DOT)
			continue;
		memset(&mbs, 0, sizeof(mbs));
		dc = pathend;
		sc = dp->d_name;
		while (dc < pathend_last) {
			clen = mbrtowi(&wc, sc, MB_LEN_MAX, &mbs);
			if (clen == (size_t)-1 || clen == (size_t)-2) {
				wc = *sc;
				clen = 1;
				memset(&mbs, 0, sizeof(mbs));
			}
			if ((*dc++ = wc) == EOS)
				break;
			sc += clen;
		}
		if (!match(pathend, pattern, restpattern)) {
			*pathend = EOS;
			continue;
		}
		err = glob2(pathbuf, --dc, pathend_last, restpattern,
		    pglob, limit);
		if (err)
			break;
	}

	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
		(*pglob->gl_closedir)(dirp);
	else
		closedir(dirp);
	return(err);
}


/*
 * Extend the gl_pathv member of a glob_t structure to accomodate 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, size_t *limit)
{
	char **pathv;
	size_t i, newsize, len;
	char *copy;
	const Char *p;

	if (*limit && pglob->gl_pathc > *limit) {
		errno = 0;
		return (GLOB_NOSPACE);
	}

	newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
	pathv = pglob->gl_pathv ?
		    (char **) realloc((char *)pglob->gl_pathv, newsize) :
		    (char **) malloc(newsize);
	if (pathv == NULL) {
		if (pglob->gl_pathv) {
			free(pglob->gl_pathv);
			pglob->gl_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 = MB_CUR_MAX * (size_t)(p - path);	/* XXX overallocation */
	if ((copy = (char *) malloc(len)) != NULL) {
		if (g_Ctoc(path, copy, len)) {
			free(copy);
			return (GLOB_NOSPACE);
		}
		pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
	}
	pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
	return(copy == NULL ? GLOB_NOSPACE : 0);
}

/*
 * pattern matching function for filenames.  Each occurrence of the *
 * pattern causes a recursion level.
 */
static int
match(Char *name, Char *pat, Char *patend)
{
	int ok, negate_range;
	Char *c, *k;
	size_t k_len;

	while (pat < patend) {
		c = pat++;
		switch (*c & M_MASK) {
		case M_ALL:
			if (pat == patend)
				return(1);
			do
			    if (match(name, pat, patend))
				    return(1);
			while (*name++ != EOS);
			return(0);
		case M_ONE:
			if (*name++ == EOS)
				return(0);
			break;
		case M_SET:
			ok = 0;
			if (*(k = name) == EOS)
				return(0);
			k_len = next_unicode_char (k);
			name += k_len;
			if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
				++pat;
			while ((*(c = pat++) & M_MASK) != M_END) {
				size_t len1 = 1, len2 = 1;

				if ((*c & M_MASK) == M_NAMED) {
					if (iswctype (*k, *pat++))
						ok = 1;
					continue;
				}
				if ((*c & M_MASK) == M_EQUIV) {
					if (is_unicode_equiv (*k, *pat++))
						ok = 1;
					continue;
				}
				if (M_COLL_P(*c)) {
					len1 = M_COLL_CNT(*c);
					++c;
					pat += len1;
				}
				if ((*pat & M_MASK) == M_RNG) {
					if (M_COLL_P(pat[1]))
						len2 = M_COLL_CNT(*++pat);
#ifdef __CYGWIN__
					if ((!__get_current_collate_locale ()->win_locale[0]) ?
#else
					if (__collate_load_error ?
#endif
					    *c <= *k && *k <= pat[1] :
					       __wscollate_range_cmp(c, k, len1, k_len) <= 0
					    && __wscollate_range_cmp(k, pat + 1, k_len, len2) <= 0
					   )
						ok = 1;
					pat += len2 + 1;
				} else if (len1 == k_len &&
					   wcincmp (c, k, len1) == 0)
					ok = 1;
			}
			if (ok == negate_range)
				return(0);
			break;
		default:
			if (Cchar(*name++) != Cchar(*c))
				return(0);
			break;
		}
	}
	return(*name == EOS);
}

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

	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;
	}
}

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

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

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

	return(opendir(buf));
}

#define CYGWIN_gl_stat(sfptr) ((*pglob->sfptr) (buf, sb))

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

	if (g_Ctoc(fn, buf, sizeof(buf))) {
		errno = ENAMETOOLONG;
		return (-1);
	}
	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
		return CYGWIN_gl_stat (gl_lstat);
	return(lstat(buf, sb));
}

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

	if (g_Ctoc(fn, buf, sizeof(buf))) {
		errno = ENAMETOOLONG;
		return (-1);
	}
	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
		return CYGWIN_gl_stat (gl_stat);
	return(stat(buf, sb));
}

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

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

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

	memset(&mbs, 0, sizeof(mbs));
	while (len >= (size_t) MB_CUR_MAX) {
		clen = wirtomb(buf, CHAR (*str), &mbs);
		if (clen == (size_t)-1)
			return (1);
		if (*str == L'\0')
			return (0);
		str++;
		buf += clen;
		len -= clen;
	}
	return (1);
}

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

	(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
