The R Project SVN R

/* modified from dos_glob.c to work with wchar_t */

/*

 * 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.

 */

#if defined(LIBC_SCCS) && !defined(lint)

static char sccsid[] = "@(#)glob.c	8.3 (Berkeley) 10/13/93";

/* most changes between the version above and the one below have been ported:

static char sscsid[]=  "$OpenBSD: glob.c,v 1.8.10.1 2001/04/10 jason Exp $";

 */

#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_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.

 * GLOB_ALPHASORT:

 *	sort alphabetically like csh (case doesn't matter) instead of in ASCII

 *	order

 */

#include <wchar.h>

#include "dos_wglob.h"

//#define GLOB_DEBUG

#ifdef GLOB_DEBUG

void Rprintf(const char *, ...);

#endif

/* declarations from Defn.h, definitions in platform.c */

struct R_wdirent {

    wchar_t *d_name; /* null-terminated filename */

};

typedef struct R_WDIR_INTERNAL R_WDIR;

R_WDIR *R_wopendir(const wchar_t *name);

struct R_wdirent *R_wreaddir(R_WDIR *rdir);

int R_wclosedir(R_WDIR *rdir);

#define	MAXPATHLEN	65536	

#define DOSISH

#define ARG_MAX		14500

#define	BG_DOLLAR	L'$'

#define	BG_DOT		L'.'

#define	BG_EOS		L'\0'

#define	BG_LBRACKET	L'['

#define	BG_NOT		L'!'

#define	BG_QUESTION	L'?'

#define	BG_QUOTE	L'\\'

#define	BG_RANGE	L'-'

#define	BG_RBRACKET	L']'

#define	BG_SEP		L'/'

#ifdef DOSISH /* true, cannot be set to false anymore */

#define BG_SEP2		L'\\'

#endif

#define	BG_STAR		L'*'

#define	BG_TILDE	L'~'

#define	BG_UNDERSCORE	L'_'

#define	BG_LBRACE	L'{'

#define	BG_RBRACE	L'}'

#define	BG_SLASH	L'/'

#define	BG_COMMA	L','

#include <stdlib.h>

#include <dirent.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <string.h>

#include <wctype.h>

typedef size_t STRLEN;

typedef struct _stat Stat_t;

typedef struct R_wdirent Direntry_t;

static int	 compare(const void *, const void *);

static int	 ci_compare(const void *, const void *);

static int	 g_Ctoc(const wchar_t *, wchar_t *, STRLEN);

static int	 g_lstat(wchar_t *, Stat_t *, wglob_t *);

static R_WDIR	*g_opendir(wchar_t *, wglob_t *);

static const wchar_t *

		 g_strchr(const wchar_t *, int);

static int	 glob0(const wchar_t *, wglob_t *);

static int	 glob1(wchar_t *, wchar_t *, wglob_t *, size_t *);

static int	 glob2(wchar_t *, wchar_t *, wchar_t *, wchar_t *, wchar_t *, wchar_t *,

		       wglob_t *, size_t *);

static int	 glob3(wchar_t *, wchar_t *, wchar_t *, wchar_t *, wchar_t *, wchar_t *,

		       wchar_t *, wchar_t *, wglob_t *, size_t *);

static int	 globextend(const wchar_t *, wglob_t *, size_t *);

static const wchar_t *

		 globtilde(const wchar_t *, wchar_t *, size_t, wglob_t *);

static int	 globexp1(const wchar_t *, wglob_t *);

static int	 globexp2(const wchar_t *, const wchar_t *, wglob_t *, int *);

static int	 match(wchar_t *, wchar_t *, wchar_t *, int);

#ifdef GLOB_DEBUG

static void	 qprintf(const char *, wchar_t *);

#endif /* GLOB_DEBUG */

/* 

   Protected and meta characters are from Unicode Private Use Area.

   The DOS version set the upper bit of bytes for meta characters.

   An earlier wchar_t version set the top bits of wchar_t.

*/

#define	M_MASK		0xffff /* pointless in current setup */

#define P_LBRACKET  (wchar_t)	0xfdd0

#define P_RBRACKET  (wchar_t)	0xfdd1

#define P_RANGE	    (wchar_t)	0xfdd2

#define P_LBRACE    (wchar_t)	0xfdd3

#define P_RBRACE    (wchar_t)	0xfdd4

#define P_TILDE	    (wchar_t)	0xfdd5

#define P_QUOTE	    (wchar_t)	0xfdd6

#define	M_ALL	    (wchar_t)	0xfdd7

#define	M_END	    (wchar_t)	0xfdd8

#define	M_NOT	    (wchar_t)	0xfdd9

#define	M_ONE	    (wchar_t)	0xfdda

#define	M_RNG	    (wchar_t)	0xfddb

#define	M_SET	    (wchar_t)	0xfddc

static wchar_t WC_PROTECT(wchar_t c)

{

    /* []-{}~\ */

    switch(c) {

	case BG_LBRACKET: return P_LBRACKET;

	case BG_RBRACKET: return P_RBRACKET;

	case BG_RANGE: return P_RANGE;

	case BG_LBRACE: return P_LBRACE;

	case BG_RBRACE: return P_RBRACE;

	case BG_TILDE: return P_TILDE;

	case BG_QUOTE: return P_QUOTE;

	default:

	    /* not reachable */

	    return c;

    }

}

static int ismeta(wchar_t c)

{

    switch(c) {

	case M_ALL:

	case M_END:

	case M_NOT:

	case M_ONE:

	case M_RNG:

	case M_SET:

	    return 1;

	default:

	    return 0;

    }

}

static wchar_t CHAR(wchar_t c)

{

    switch(c) {

	case P_LBRACKET: return BG_LBRACKET;

	case P_RBRACKET: return BG_RBRACKET;

	case P_RANGE: return BG_RANGE;

	case P_LBRACE: return BG_LBRACE;

	case P_RBRACE: return BG_RBRACE;

	case P_TILDE: return BG_TILDE;

	case P_QUOTE: return BG_QUOTE;

	case M_ALL: return BG_STAR;

	case M_END: return BG_RBRACKET;

	case M_NOT: return BG_NOT;

	case M_ONE: return BG_QUESTION;

	case M_RNG: return BG_RANGE;

	case M_SET: return BG_LBRACKET;

	default:

	    return c;

    }

}

int

dos_wglob(const wchar_t *pattern, int flags,

	  int (*errfunc)(const wchar_t *, int), wglob_t *pglob)

{

    const wchar_t *patnext;

    int c;

    wchar_t *bufnext, *bufend, patbuf[MAXPATHLEN];

    patnext = pattern;

#if 1

    if (!(flags & GLOB_APPEND)) {

	pglob->gl_pathc = 0;

	pglob->gl_pathv = NULL;

	if (!(flags & GLOB_DOOFFS))

	    pglob->gl_offs = 0;

    }

#else

    pglob->gl_pathc = 0;

    pglob->gl_pathv = NULL;

    pglob->gl_offs = 0;

#endif

    pglob->gl_flags = flags & ~GLOB_MAGCHAR;

    pglob->gl_errfunc = errfunc;

    pglob->gl_matchc = 0;

    bufnext = patbuf;

    bufend = bufnext + MAXPATHLEN - 1;

#ifdef DOSISH /* true */

    /* Nasty hack to treat patterns like "C:*" correctly. In this

     * case, the * should match any file in the current directory

     * on the C: drive. However, the glob code does not treat the

     * colon specially, so it looks for files beginning "C:" in

     * the current directory. To fix this, change the pattern to

     * add an explicit "./" at the start (just after the drive

     * letter and colon - ie change to "C:./").

     */

    if (iswalpha(pattern[0]) && pattern[1] == L':' &&

	pattern[2] != BG_SEP && pattern[2] != BG_SEP2 &&

	bufend - bufnext > 4) {

	*bufnext++ = pattern[0];

	*bufnext++ = L':';

	*bufnext++ = L'.';

	*bufnext++ = BG_SEP;

	patnext += 2;

    }

    /* Hack from Tony Plate to allow UNC network drive specification:

     * Without this code, '\\' (i.e., literally two backslashes inpattern)

     * at the beginning of a path is not recognized as a network drive,

     * because the GLOB_QUOTE loop below changes the two backslashes to one.

     * So, in the case where there are two but not three backslashes at

     * the beginning of the path, transfer these to the output.

     */

    if (patnext == pattern && bufend - bufnext > 2 &&

	pattern[0] == BG_SEP2 && pattern[1] == BG_SEP2 &&

	pattern[2] != BG_SEP2) {

	*bufnext++ = pattern[0];

	*bufnext++ = pattern[1];

	patnext += 2;

    }

#endif

    if (flags & GLOB_QUOTE) {

	/* Protect the quoted characters. */

	while (bufnext < bufend && (c = *patnext++) != BG_EOS)

	    if (c == BG_QUOTE) {

#ifdef DOSISH /* true */

		/* To avoid backslashitis on Win32,

		 * we only treat \ as a quoting character

		 * if it precedes one of the

		 * metacharacters []-{}~\

		 */

		if ((c = *patnext++) != L'[' && c != L']' &&

		    c != L'-' && c != L'{' && c != L'}' &&

		    c != L'~' && c != L'\\') {

		    /* WC_PROTECT has to support all characters above */

#else

# error DOSISH must be true

		if ((c = *patnext++) == BG_EOS) {

#endif

		    c = BG_QUOTE;

		    --patnext;

		}

		*bufnext++ = WC_PROTECT(c);

	    } else

		*bufnext++ = c;

	} else

	    while (bufnext < bufend && (c = *patnext++) != BG_EOS)

		*bufnext++ = c;

    *bufnext = BG_EOS;

    if (flags & GLOB_BRACE)

	return globexp1(patbuf, pglob);

    else

	return glob0(patbuf, pglob);

}

/*

 * 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 wchar_t *pattern, wglob_t *pglob)

{

    const wchar_t* ptr = pattern;

    int rv;

    /* Protect a single {}, for find(1), like csh */

    if (pattern[0] == BG_LBRACE && pattern[1] == BG_RBRACE && pattern[2] == BG_EOS)

	return glob0(pattern, pglob);

    while ((ptr = (const wchar_t *) g_strchr(ptr, BG_LBRACE)) != NULL)

	if (!globexp2(ptr, pattern, pglob, &rv))

	    return rv;

    return glob0(pattern, pglob);

}

/*

 * 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 wchar_t *ptr, const wchar_t *pattern,

	 wglob_t *pglob, int *rv)

{

    int     i;

    wchar_t   *lm, *ls;

    const wchar_t *pe, *pm, *pl;

    wchar_t    patbuf[MAXPATHLEN];

    /* copy part up to the brace */

    for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)

	;

    *lm = BG_EOS;

    ls = lm;

    /* Find the balanced brace */

    for (i = 0, pe = ++ptr; *pe; pe++)

	if (*pe == BG_LBRACKET) {

	    /* Ignore everything between [] */

	    for (pm = pe++; *pe != BG_RBRACKET && *pe != BG_EOS; pe++)

		;

	    if (*pe == BG_EOS) {

		/*

		 * We could not find a matching BG_RBRACKET.

		 * Ignore and just look for BG_RBRACE

		 */

		pe = pm;

	    }

	} else if (*pe == BG_LBRACE)

	    i++;

	else if (*pe == BG_RBRACE) {

	    if (i == 0)

		break;

	    i--;

	}

    /* Non matching braces; just glob the pattern */

    if (i != 0 || *pe == BG_EOS) {

	*rv = glob0(patbuf, pglob);

	return 0;

    }

    for (i = 0, pl = pm = ptr; pm <= pe; pm++) {

	switch (*pm) {

	case BG_LBRACKET:

	    /* Ignore everything between [] */

	    for (pl = pm++; *pm != BG_RBRACKET && *pm != BG_EOS; pm++)

		;

	    if (*pm == BG_EOS) {

		/*

		 * We could not find a matching BG_RBRACKET.

		 * Ignore and just look for BG_RBRACE

		 */

		pm = pl;

	    }

	    break;

	case BG_LBRACE:

	    i++;

	    break;

	case BG_RBRACE:

	    if (i) {

		i--;

		break;

	    }

	    /* FALLTHROUGH */

	case BG_COMMA:

	    if (i && *pm == BG_COMMA)

		break;

	    else {

		/* Append the current string */

		for (lm = ls; (pl < pm); *lm++ = *pl++)

		    ;

		/*

		 * Append the rest of the pattern after the

		 * closing brace

		 */

		for (pl = pe + 1; (*lm++ = *pl++) != BG_EOS; )

		    ;

		/* Expand the current pattern */

#ifdef GLOB_DEBUG

		qprintf("globexp2:", patbuf);

#endif /* GLOB_DEBUG */

		*rv = globexp1(patbuf, pglob);

		/* move after the comma, to the next string */

		pl = pm + 1;

	    }

	    break;

	default:

	    break;

	}

    }

    *rv = 0;

    return 0;

}

/*

 * expand tilde from the passwd file: not supported.

 */

static const wchar_t *

globtilde(const wchar_t *pattern, wchar_t *patbuf, size_t patbuf_len, wglob_t *pglob)

{

    wchar_t *h;

    const wchar_t *p;

    wchar_t *b, *eb;

    if (*pattern != BG_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 = (wchar_t *) patbuf;

	 h < eb && *p && *p != BG_SLASH; *h++ = *p++)

	;

    *h = BG_EOS;

    if (((wchar_t *) patbuf)[0] == BG_EOS) {

	/*

	 * handle a plain ~ or ~/ by expanding $HOME

	 * first and then trying the password file

	 */

	if ((h = _wgetenv(L"R_USER")) == NULL) {

	    return pattern;

	}

    } else {

	/*

	 * Expand a ~user

	 */

	return pattern;

    }

    /* Copy the home directory */

    for (b = patbuf; b < eb && *h; *b++ = *h++)

	;

    /* Append the rest of the pattern */

    while (b < eb && (*b++ = *p++) != BG_EOS)

	;

    *b = BG_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.  It is not an error

 * to find no matches.

 */

static int

glob0(const wchar_t *pattern, wglob_t *pglob)

{

    const wchar_t *qpat, *qpatnext;

    int c, err, oldflags, oldpathc;

    wchar_t *bufnext, patbuf[MAXPATHLEN];

    size_t limit = 0;

    qpat = globtilde(pattern, patbuf, MAXPATHLEN, pglob);

    qpatnext = qpat;

    oldflags = pglob->gl_flags;

    oldpathc = pglob->gl_pathc;

    bufnext = patbuf;

    /* We don't need to check for buffer overflow any more. */

    while ((c = *qpatnext++) != BG_EOS) {

	switch (c) {

	case BG_LBRACKET:

	    c = *qpatnext;

	    if (c == BG_NOT)

		++qpatnext;

	    if (*qpatnext == BG_EOS ||

		g_strchr((wchar_t *) qpatnext+1, BG_RBRACKET) == NULL) {

		*bufnext++ = BG_LBRACKET;

		if (c == BG_NOT)

		    --qpatnext;

		break;

	    }

	    *bufnext++ = M_SET;

	    if (c == BG_NOT)

		*bufnext++ = M_NOT;

	    c = *qpatnext++;

	    do {

		*bufnext++ = CHAR(c);

		if (*qpatnext == BG_RANGE &&

		    (c = qpatnext[1]) != BG_RBRACKET) {

		    *bufnext++ = M_RNG;

		    *bufnext++ = CHAR(c);

		    qpatnext += 2;

		}

	    } while ((c = *qpatnext++) != BG_RBRACKET);

	    pglob->gl_flags |= GLOB_MAGCHAR;

	    *bufnext++ = M_END;

	    break;

	case BG_QUESTION:

	    pglob->gl_flags |= GLOB_MAGCHAR;

	    *bufnext++ = M_ONE;

	    break;

	case BG_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 = BG_EOS;

#ifdef GLOB_DEBUG

    qprintf("glob0:", patbuf);

#endif /* GLOB_DEBUG */

    if ((err = glob1(patbuf, patbuf+MAXPATHLEN-1, pglob, &limit)) != 0) {

	pglob->gl_flags = oldflags;

	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 &&

	((pglob->gl_flags & GLOB_NOCHECK) ||

	 ((pglob->gl_flags & GLOB_NOMAGIC) &&

	  !(pglob->gl_flags & GLOB_MAGCHAR))))

    {

#ifdef GLOB_DEBUG

	Rprintf("calling globextend from glob0\n");

#endif /* GLOB_DEBUG */

	pglob->gl_flags = oldflags;

	return(globextend(qpat, pglob, &limit));

    }

    else if (!(pglob->gl_flags & GLOB_NOSORT) &&

	      (pglob->gl_pathc - oldpathc) > 0)

	qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,

	      pglob->gl_pathc - oldpathc, sizeof(wchar_t *),

	      (pglob->gl_flags & (GLOB_ALPHASORT|GLOB_NOCASE))

	      ? ci_compare : compare);

    pglob->gl_flags = oldflags;

    return(0);

}

static int

ci_compare(const void *p, const void *q)

{

    const wchar_t *pp = *(const wchar_t **)p;

    const wchar_t *qq = *(const wchar_t **)q;

    int ci;

    while (*pp && *qq) {

	if (towlower(*pp) != towlower(*qq))

	    break;

	++pp;

	++qq;

    }

    ci = towlower(*pp) - towlower(*qq);

    if (ci == 0)

	return compare(p, q);

    return ci;

}

static int

compare(const void *p, const void *q)

{

    return(wcscmp(*(wchar_t **)p, *(wchar_t **)q));

}

static int

glob1(wchar_t *pattern, wchar_t *pattern_last, wglob_t *pglob, size_t *limitp)

{

    wchar_t pathbuf[MAXPATHLEN];

    /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */

    if (*pattern == BG_EOS) return(0);

    return(glob2(pathbuf, pathbuf+MAXPATHLEN-1,

		 pathbuf, pathbuf+MAXPATHLEN-1,

		 pattern, pattern_last, pglob, limitp));

}

/*

 * 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(wchar_t *pathbuf, wchar_t *pathbuf_last, wchar_t *pathend, wchar_t *pathend_last,

      wchar_t *pattern, wchar_t *pattern_last, wglob_t *pglob, size_t *limitp)

{

    Stat_t sb;

    wchar_t *p, *q;

    int anymeta;

    /*

     * Loop over pattern segments until end of pattern or until

     * segment with meta character found.

     */

    for (anymeta = 0;;) {

	if (*pattern == BG_EOS) {		/* End of pattern? */

	    *pathend = BG_EOS;

	    if (g_lstat(pathbuf, &sb, pglob)) return(0);

	    if (((pglob->gl_flags & GLOB_MARK) &&

		 pathend[-1] != BG_SEP

#ifdef DOSISH /* true */

		 && pathend[-1] != BG_SEP2

#endif

		    ) && S_ISDIR(sb.st_mode) ) {

		if (pathend+1 > pathend_last)

		    return (1);

		*pathend++ = BG_SEP;

		*pathend = BG_EOS;

	    }

	    ++pglob->gl_matchc;

#ifdef GLOB_DEBUG

	    Rprintf("calling globextend from glob2\n");

#endif /* GLOB_DEBUG */

	    return(globextend(pathbuf, pglob, limitp));

	}

	/* Find end of next segment, copy tentatively to pathend. */

	q = pathend;

	p = pattern;

	while (*p != BG_EOS && *p != BG_SEP

#ifdef DOSISH /* true */

	       && *p != BG_SEP2

#endif

	    ) {

	    if (ismeta(*p)) anymeta = 1;

	    if (q+1 > pathend_last) return (1);

	    *q++ = *p++;

	}

	if (!anymeta) {		/* No expansion, do next segment. */

	    pathend = q;

	    pattern = p;

	    while (*pattern == BG_SEP

#ifdef DOSISH /* true */

		   || *pattern == BG_SEP2

#endif

		) {

		if (pathend+1 > pathend_last) return (1);

		*pathend++ = *pattern++;

	    }

	} else

	    /* Need expansion, recurse. */

	    return(glob3(pathbuf, pathbuf_last, pathend,

			 pathend_last, pattern, pattern_last,

			 p, pattern_last, pglob, limitp));

    }

    /* NOTREACHED */

}

static int

glob3(wchar_t *pathbuf, wchar_t *pathbuf_last, wchar_t *pathend, wchar_t *pathend_last,

      wchar_t *pattern, wchar_t *pattern_last,

      wchar_t *restpattern, wchar_t *restpattern_last, wglob_t *pglob, size_t *limitp)

{

    Direntry_t *dp;

    R_WDIR *dirp;

    int err;

    int nocase;

    wchar_t buf[MAXPATHLEN];

    if (pathend > pathend_last)

	return (1);

    *pathend = BG_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_ABEND);

	    if (pglob->gl_errfunc(buf, errno) ||

		(pglob->gl_flags & GLOB_ERR))

		return (GLOB_ABEND);

	}

	return(0);

    }

    err = 0;

    nocase = ((pglob->gl_flags & GLOB_NOCASE) != 0);

    /* Search directory for matching names. */

    while ((dp = R_wreaddir(dirp))) {

	wchar_t *sc, *dc;

	/* Initial BG_DOT must be matched literally. */

	if (dp->d_name[0] == BG_DOT && *pattern != BG_DOT)

	    continue;

	dc = pathend;

	sc = dp->d_name;

	while (dc < pathend_last && (*dc++ = *sc++) != BG_EOS)

	    ;

	if (dc >= pathend_last) {

	    *dc = BG_EOS;

	    err = 1;

	    break;

	}

	if (!match(pathend, pattern, restpattern, nocase)) {

	    *pathend = BG_EOS;

	    continue;

	}

	err = glob2(pathbuf, pathbuf_last, --dc, pathend_last,

		    restpattern, restpattern_last, pglob, limitp);

	if (err)

	    break;

    }

    R_wclosedir(dirp);

    return(err);

}

#include <R_ext/RS.h> /* for R_Calloc, R_Realloc, R_Free */

/*

 * 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 wchar_t *path, wglob_t *pglob, size_t *limitp)

{

    wchar_t **pathv;

    int i;

    STRLEN newsize, len;

    wchar_t *copy;

    const wchar_t *p;

#ifdef GLOB_DEBUG

    Rprintf("Adding ");

    for (p = path; *p; p++)

	(void)Rprintf("%c", CHAR(*p));

    Rprintf("\n");

#endif /* GLOB_DEBUG */

    newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);

    if (pglob->gl_pathv)

	pathv = R_Realloc(pglob->gl_pathv, newsize, wchar_t *);

    else

	pathv = R_Calloc(newsize, wchar_t *);

    if (pathv == NULL) {

	if (pglob->gl_pathv) {

	    R_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; --i >= 0; )

	    *--pathv = NULL;

    }

    pglob->gl_pathv = pathv;

    for (p = path; *p++;)

	;

    len = (STRLEN)(p - path);

    *limitp += len;

    copy = R_Calloc(p-path, wchar_t);

    if (copy != NULL) {

	if (g_Ctoc(path, copy, len)) {

	    R_Free(copy);

	    return(GLOB_NOSPACE);

	}

	pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;

    }

    pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;

    if ((pglob->gl_flags & GLOB_LIMIT) &&

	newsize + *limitp >= ARG_MAX) {

	errno = 0;

	return(GLOB_NOSPACE);

    }

    return(copy == NULL ? GLOB_NOSPACE : 0);

}

/*

 * pattern matching function for filenames.  Each occurrence of the *

 * pattern causes a recursion level.

 */

static int

match(wchar_t *name, wchar_t *pat, wchar_t *patend, int nocase)

{

    int ok, negate_range;

    wchar_t c, k;

    while (pat < patend) {

	c = *pat++;

	switch (c & M_MASK) {

	case M_ALL:

	    if (pat == patend)

		return(1);

	    do

		if (match(name, pat, patend, nocase))

		    return(1);

	    while (*name++ != BG_EOS)

		;

	    return(0);

	case M_ONE:

	    if (*name++ == BG_EOS)

		return(0);

	    break;

	case M_SET:

	    ok = 0;

	    if ((k = *name++) == BG_EOS)

		return(0);

	    if ((negate_range = ((*pat & M_MASK) == M_NOT)) != BG_EOS)

		++pat;

	    while (((c = *pat++) & M_MASK) != M_END)

		if ((*pat & M_MASK) == M_RNG) {

		    if (nocase) {

			if (towlower(c) <= towlower(k) && towlower(k) <= towlower(pat[1]))

			    ok = 1;

		    } else {

			if (c <= k && k <= pat[1])

			    ok = 1;

		    }

		    pat += 2;

		} else if (nocase ? (towlower(c) == towlower(k)) : (c == k))

		    ok = 1;

	    if (ok == negate_range)

		return(0);

	    break;

	default:

	    k = *name++;

	    if (nocase ? (towlower(k) != towlower(c)) : (k != c))

		return(0);

	    break;

	}

    }

    return(*name == BG_EOS);

}

/* Free allocated data belonging to a wglob_t structure. */

void

dos_wglobfree(wglob_t *pglob)

{

    int i;

    wchar_t **pp;

    if (pglob->gl_pathv != NULL) {

	pp = pglob->gl_pathv + pglob->gl_offs;

	for (i = pglob->gl_pathc; i--; ++pp)

	    if (*pp)

		R_Free(*pp);

	R_Free(pglob->gl_pathv);

	pglob->gl_pathv = NULL;

    }

}

static R_WDIR *

g_opendir(wchar_t *str, wglob_t *pglob)

{

    wchar_t buf[MAXPATHLEN];

    if (!*str) wcscpy(buf, L".");

    else

	if (g_Ctoc(str, buf, sizeof(buf))) return(NULL);

    return R_wopendir(buf);

}

static int

g_lstat(wchar_t *fn, Stat_t *sb, wglob_t *pglob)

{

    wchar_t buf[MAXPATHLEN];

    if (g_Ctoc(fn, buf, sizeof(buf)))

	return(-1);

    return(_wstat(buf, sb));

}

static const wchar_t *

g_strchr(const wchar_t *str, int ch)

{

    do {

	if (*str == ch)

	    return (str);

    } while (*str++);

    return (NULL);

}

static int

g_Ctoc(const wchar_t *str, wchar_t *buf, STRLEN len)

{

    while (len--)

	if ((*buf++ = *str++) == BG_EOS) return 0;

    return 1;

}

#ifdef GLOB_DEBUG

static void

qprintf(const char *str, wchar_t *s)

{

    wchar_t *p;

    (void)Rprintf("%s:\n", str);

    for (p = s; *p; p++)

	(void)Rprintf("%lc", CHAR(*p));

    (void)Rprintf("\n");

#if 0

    for (p = s; *p; p++)

	(void)Rprintf("%lc", *p & M_PROTECT ? L'"' : L' ');

    (void)Rprintf("\n");

#endif

    for (p = s; *p; p++)