/**
 * $Id: LTglob.c,v 1.9 2000/01/09 13:02:12 amai Exp $
 *
 * derived from GNU libc glob.c
 *
 * Copyright (C) 1995 Free Software Foundation, Inc.
 * Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc.
 *
 * This file is part of the GNU LessTif Library.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 **/

static const char rcsid[] = "$Id: LTglob.c,v 1.9 2000/01/09 13:02:12 amai Exp $";

#if defined (_AIX) && !defined (__GNUC__)
#pragma alloca
#endif

#include <LTconfig.h>
#include <X11/Intrinsic.h>
#include <X11/Xfuncs.h>

#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>


#ifdef	STDC_HEADERS
#include <stddef.h>
#endif

#ifdef	HAVE_UNISTD_H
#include <unistd.h>
#ifndef POSIX
#ifdef	_POSIX_VERSION
#define	POSIX
#endif
#endif
#endif

#if !defined(__GNU_LIBRARY__) && !defined(STDC_HEADERS)
extern int errno;
#endif

#ifndef	NULL
#define	NULL	0
#endif


#if	defined (POSIX) || defined (HAVE_DIRENT_H) || defined (__GNU_LIBRARY__)
#include <dirent.h>
#ifndef	__GNU_LIBRARY__
#define D_NAMLEN(d) strlen((d)->d_name)
#else /* GNU C library.  */
#define D_NAMLEN(d) ((d)->d_namlen)
#endif /* Not GNU C library.  */
#else /* Not POSIX or HAVE_DIRENT_H.  */
#define direct dirent
#define D_NAMLEN(d) ((d)->d_namlen)
#ifdef	HAVE_SYS_NDIR_H
#include <sys/ndir.h>
#endif /* HAVE_SYS_NDIR_H */
#ifdef	HAVE_SYS_DIR_H
#include <sys/dir.h>
#endif /* HAVE_SYS_DIR_H */
#ifdef HAVE_NDIR_H
#include <ndir.h>
#endif /* HAVE_NDIR_H */
#endif /* POSIX or HAVE_DIRENT_H or __GNU_LIBRARY__.  */

#if defined (POSIX) && !defined (__GNU_LIBRARY__)
/* Posix does not require that the d_ino field be present, and some
   systems do not provide it. */
#define REAL_DIR_ENTRY(dp) 1
#else
#define REAL_DIR_ENTRY(dp) (dp->d_ino != 0)
#endif /* POSIX */

#if	(defined (STDC_HEADERS) || defined (__GNU_LIBRARY__))
#include <stdlib.h>
#include <string.h>
#define	ANSI_STRING
#else /* No standard headers.  */

#ifdef HAVE_STRING_H
#include <string.h>
#define	ANSI_STRING
#else
#include <strings.h>
#endif
#ifdef	HAVE_MEMORY_H
#include <memory.h>
#endif

extern void qsort();

#endif /* Standard headers.  */

#ifdef __EMX__   /* -> OS/2 drive letters support */
#define  INCL_DOS
#define  INCL_DOSMISC
#define  INCL_ERRORS
#include <os2.h>
#endif

#ifndef	HAVE_STRCOLL
#define	strcoll	strcmp
#endif


#if 0
#ifndef	__GNU_LIBRARY__
#ifdef	__GNUC__
__inline
#endif
static void *
my_realloc(void *p,
	   unsigned int n)
{
    /* These casts are the for sake of the broken Ultrix compiler,
       which warns of illegal pointer combinations otherwise.  */
    if (p == NULL)
	return (char *)XtMalloc(n);
    return (char *)XtRealloc(p, n);
}
#define	realloc	my_realloc
#endif
#endif


#if !defined(__alloca)
#ifdef	__GNUC__
#undef	alloca
#define	alloca(n)	__builtin_alloca (n)
#else /* Not GCC.  */
#if	defined (sparc) || defined (HAVE_ALLOCA_H)
#include <alloca.h>
#else /* Not sparc or HAVE_ALLOCA_H.  */
#ifndef	_AIX
extern char *alloca(size_t size_to_allocate);
#endif /* Not _AIX.  */
#endif /* sparc or HAVE_ALLOCA_H.  */
#endif /* GCC.  */

#define	__alloca	alloca

#endif

#if 0
/* rws 5 Nov 1998
   What is all this for??  IMO a link to a directory is still a directory.
   We shouldn't care whether it is a link or not, therefore I think stat is
   the correct call here, whether we have lstat or not.  If I'm wrong, write
   a test and prove it by doing a FileSelectionSearch on a directory with
   links to directories and comparing the results.
 */

#ifndef __GNU_LIBRARY__
#  define __lstat lstat
#  ifndef HAVE_LSTAT
#    define lstat stat
#  endif
#  ifdef STAT_MACROS_BROKEN
#    undef S_ISDIR
#  endif
#  ifndef S_ISDIR
#    define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
#  endif
#endif

#else

#define __lstat stat
#ifdef STAT_MACROS_BROKEN
#  undef S_ISDIR
#endif
#ifndef S_ISDIR
#  define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
#endif

#endif

#ifndef	STDC_HEADERS
#undef	size_t
#define	size_t	unsigned int
#endif

/* Some system header files erroneously define these.
   We want our own definitions from <fnmatch.h> to take precedence.  */
#undef	FNM_PATHNAME
#undef	FNM_NOESCAPE
#undef	FNM_PERIOD
#include <LTfnmatch.h>

/* Some system header files erroneously define these.
   We want our own definitions from <glob.h> to take precedence.  */
#undef	GLOB_ERR
#undef	GLOB_MARK
#undef	GLOB_NOSORT
#undef	GLOB_DOOFFS
#undef	GLOB_NOCHECK
#undef	GLOB_APPEND
#undef	GLOB_NOESCAPE
#undef	GLOB_PERIOD
#include <LTglob.h>

__ptr_t(*__glob_opendir_hook) __P((const char *directory));
     const char *(*__glob_readdir_hook) __P((__ptr_t stream));
     void (*__glob_closedir_hook) __P((__ptr_t stream));

     static int glob_pattern_p __P((const char *pattern, int quote));
     static int glob_in_dir __P((const char *pattern, const char *directory,
				 int flags,
				 int (*errfunc) __P((const char *, int)),
				 glob_t *pglob));
     static int prefix_array __P((const char *prefix, char **array, size_t n));
     static int collated_compare __P((const __ptr_t, const __ptr_t));

/* Do glob searching for PATTERN, placing results in PGLOB.
   The bits defined above may be set in FLAGS.
   If a directory cannot be opened or read and ERRFUNC is not nil,
   it is called with the pathname that caused the error, and the
   `errno' value from the failing call; if it returns non-zero
   `glob' returns GLOB_ABEND; if it returns zero, the error is ignored.
   If memory cannot be allocated for PGLOB, GLOB_NOSPACE is returned.
   Otherwise, `glob' returns zero.
 */
int
 _Lesstif_glob(const char *pattern, int flags,
	       int (*errfunc) __P((const char *, int)),
	       glob_t *pglob)
{
    const char *filename;
    char *dirname;
    size_t dirlen;
    int status;
    int oldcount;

    if (pattern == NULL || pglob == NULL || (flags & ~__GLOB_FLAGS) != 0)
    {
	errno = EINVAL;
	return -1;
    }

    /* Find the filename.  */
    filename = strrchr(pattern, '/');
    if (filename == NULL)
    {
	filename = pattern;
	dirname = (char *)".";
	dirlen = 0;
    }
    else if (filename == pattern)
    {
	/* "/pattern".  */
	dirname = (char *)"/";
	dirlen = 1;
	++filename;
    }
    else
    {
	dirlen = filename - pattern;
	dirname = (char *)__alloca(dirlen + 1);
	bcopy(pattern, dirname, dirlen);
	dirname[dirlen] = '\0';
	++filename;
    }

    if (filename[0] == '\0' && dirlen > 1)
	/* "pattern/".  Expand "pattern", appending slashes.  */
    {
	int val = _Lesstif_glob(dirname, flags | GLOB_MARK, errfunc, pglob);
	if (val == 0)
	    pglob->gl_flags = (pglob->gl_flags & ~GLOB_MARK) |
		(flags & GLOB_MARK);
	return val;
    }

    if (!(flags & GLOB_APPEND))
    {
	pglob->gl_pathc = 0;
	pglob->gl_pathv = NULL;
    }

    oldcount = pglob->gl_pathc;

    if (glob_pattern_p(dirname, !(flags & GLOB_NOESCAPE)))
    {
	/* The directory name contains metacharacters, so we
	   have to glob for the directory, and then glob for
	   the pattern in each directory found.  */
	glob_t dirs;
	register int i;

	status = _Lesstif_glob(dirname,
			 ((flags & (GLOB_ERR | GLOB_NOCHECK | GLOB_NOESCAPE)) |
			  GLOB_NOSORT),
			       errfunc, &dirs);
	if (status != 0)
	    return status;

	/* We have successfully globbed the preceding directory name.
	   For each name we found, call glob_in_dir on it and FILENAME,
	   appending the results to PGLOB.  */
	for (i = 0; i < dirs.gl_pathc; ++i)
	{
	    int oldcount;

#ifdef	SHELL
	    {
		/* Make globbing interruptible in the bash shell. */
		extern int interrupt_state;

		if (interrupt_state)
		{
		    _Lesstif_globfree(&dirs);
		    _Lesstif_globfree(&files);
		    return GLOB_ABEND;
		}
	    }
#endif /* SHELL.  */

	    oldcount = pglob->gl_pathc;
	    status = glob_in_dir(filename, dirs.gl_pathv[i],
				 (flags | GLOB_APPEND) & ~GLOB_NOCHECK,
				 errfunc, pglob);
	    if (status == GLOB_NOMATCH)
		/* No matches in this directory.  Try the next.  */
		continue;

	    if (status != 0)
	    {
		_Lesstif_globfree(&dirs);
		_Lesstif_globfree(pglob);
		return status;
	    }

	    /* Stick the directory on the front of each name.  */
	    if (prefix_array(dirs.gl_pathv[i],
			     &pglob->gl_pathv[oldcount],
			     pglob->gl_pathc - oldcount))
	    {
		_Lesstif_globfree(&dirs);
		_Lesstif_globfree(pglob);
		return GLOB_NOSPACE;
	    }
	}

	flags |= GLOB_MAGCHAR;

	if (pglob->gl_pathc == oldcount)
	{
	    /* No matches.  */
	    if (flags & GLOB_NOCHECK)
	    {
		size_t len = strlen(pattern) + 1;
		char *patcopy = (char *)XtMalloc(len);
		if (patcopy == NULL)
		    return GLOB_NOSPACE;
		bcopy(pattern, patcopy, len);

		pglob->gl_pathv =
		    (char **)XtRealloc((char *)pglob->gl_pathv,
				       (pglob->gl_pathc +
					((flags & GLOB_DOOFFS) ?
					 pglob->gl_offs : 0) +
					1 + 1) *
				       sizeof(char *));
		if (pglob->gl_pathv == NULL)
		{
		    XtFree(patcopy);
		    return GLOB_NOSPACE;
		}

		if (flags & GLOB_DOOFFS)
		    while (pglob->gl_pathc < pglob->gl_offs)
			pglob->gl_pathv[pglob->gl_pathc++] = NULL;

		pglob->gl_pathv[pglob->gl_pathc++] = patcopy;
		pglob->gl_pathv[pglob->gl_pathc] = NULL;
		pglob->gl_flags = flags;
	    }
	    else
		return GLOB_NOMATCH;
	}
    }
    else
    {
	status = glob_in_dir(filename, dirname, flags, errfunc, pglob);
	if (status != 0)
	    return status;

	if (dirlen > 0)
	{
	    /* Stick the directory on the front of each name.  */
	    if (prefix_array(dirname,
			     &pglob->gl_pathv[oldcount],
			     pglob->gl_pathc - oldcount))
	    {
		_Lesstif_globfree(pglob);
		return GLOB_NOSPACE;
	    }
	}
    }

    if (!(flags & GLOB_NOSORT))
	/* Sort the vector.  */
	qsort((__ptr_t) & pglob->gl_pathv[oldcount],
	      pglob->gl_pathc - oldcount,
	      sizeof(char *), collated_compare);

    if (flags & GLOB_MARK)
    {
	/* Append slashes to directory names.  glob_in_dir has already
	   allocated the extra character for us.

	   This must be done after the sorting to avoid screwing up the
	   order (`"./" > "../"' but `"." < ".."'). */
	int i;
	struct stat st;
	for (i = oldcount; i < pglob->gl_pathc; ++i)
	    if (__lstat(pglob->gl_pathv[i], &st) == 0 &&
		S_ISDIR(st.st_mode))
		strcat(pglob->gl_pathv[i], "/");
    }

    return 0;
}


/* Free storage allocated in PGLOB by a previous `glob' call.  */
void
_Lesstif_globfree(register glob_t *pglob)
{
    if (pglob->gl_pathv != NULL)
    {
	register int i;
	for (i = 0; i < pglob->gl_pathc; ++i)
	    if (pglob->gl_pathv[i] != NULL)
		XtFree((__ptr_t) pglob->gl_pathv[i]);
	XtFree((__ptr_t) pglob->gl_pathv);
    }
}


/* Do a collated comparison of A and B.  */
static int
collated_compare(const __ptr_t a, const __ptr_t b)
{
    const char *const s1 = *(const char *const *const)a;
    const char *const s2 = *(const char *const *const)b;

    if (s1 == s2)
	return 0;
    if (s1 == NULL)
	return 1;
    if (s2 == NULL)
	return -1;
    return strcoll(s1, s2);
}


/* Prepend DIRNAME to each of N members of ARRAY, replacing ARRAY's
   elements in place.  Return nonzero if out of memory, zero if successful.
   A slash is inserted between DIRNAME and each elt of ARRAY,
   unless DIRNAME is just "/".  Each old element of ARRAY is freed.
 */
static int
prefix_array(const char *dirname, char **array, size_t n)
{
    register size_t i;
    size_t dirlen = strlen(dirname);

    if (dirlen == 1 && dirname[0] == '/')
	/* DIRNAME is just "/", so normal prepending would get us "//foo".
	   We want "/foo" instead, so don't prepend any chars from DIRNAME.  */
	dirlen = 0;

    for (i = 0; i < n; ++i)
    {
	size_t eltlen = strlen(array[i]) + 1;
	/*
	 * MLM This is buggy.  This doesn't retain the extra byte allocated
	 * by glob_in_dir if the element is a directory.  We make it so that
	 * all elements get the extra byte.
	 */
	char *new_w = (char *)XtMalloc(dirlen + 2 + eltlen);
	if (new_w == NULL)
	{
	    while (i > 0)
		XtFree((__ptr_t) array[--i]);
	    return 1;
	}

	bcopy(dirname, new_w, dirlen);
	new_w[dirlen] = '/';
	bcopy(array[i], &new_w[dirlen + 1], eltlen);
	XtFree((__ptr_t) array[i]);
	array[i] = new_w;
    }

    return 0;
}


/* Return nonzero if PATTERN contains any metacharacters.
   Metacharacters can be quoted with backslashes if QUOTE is nonzero.  */
static int
glob_pattern_p(const char *pattern, int quote)
{
    register const char *p;
    int open = 0;

    for (p = pattern; *p != '\0'; ++p)
	switch (*p)
	{
	case '?':
	case '*':
	    return 1;

	case '\\':
	    if (quote)
		++p;
	    break;

	case '[':
	    open = 1;
	    break;

	case ']':
	    if (open)
		return 1;
	    break;
	}

    return 0;
}


/* Like `glob', but PATTERN is a final pathname component,
   and matches are searched for in DIRECTORY.
   The GLOB_NOSORT bit in FLAGS is ignored.  No sorting is ever done.
   The GLOB_APPEND flag is assumed to be set (always appends).
 */
static int
glob_in_dir(const char *pattern, const char *directory, int flags,
	    int (*errfunc) __P((const char *, int)),
	    glob_t *pglob)
{
    __ptr_t stream;

    struct globlink
    {
	struct globlink *next;
	char *name;
    };
    struct globlink *names = NULL, *tail = NULL;
    size_t nfound = 0;

    if (!glob_pattern_p(pattern, !(flags & GLOB_NOESCAPE)))
    {
	stream = NULL;
	flags |= GLOB_NOCHECK;
    }
    else
    {
	flags |= GLOB_MAGCHAR;

	stream = (__glob_opendir_hook ? (*__glob_opendir_hook) (directory)
		  : (__ptr_t) opendir(directory));
	if (stream == NULL)
	{
	    if ((errfunc != NULL && (*errfunc) (directory, errno)) ||
		(flags & GLOB_ERR))
		return GLOB_ABEND;
	}
	else
	    while (1)
	    {
		const char *name;
		size_t len;

		if (__glob_readdir_hook)
		{
		    name = (*__glob_readdir_hook) (stream);
		    if (name == NULL)
			break;
		    len = 0;
		}
		else
		{
		    struct dirent *d = readdir((DIR *) stream);
		    if (d == NULL)
			break;
		    if (!REAL_DIR_ENTRY(d))
			continue;
		    name = d->d_name;
#ifdef	HAVE_D_NAMLEN
		    len = d->d_namlen;
#else
		    len = 0;
#endif
		}

		if (_Lesstif_fnmatch(pattern, name,
				     (!(flags & GLOB_PERIOD) ? FNM_PERIOD : 0) |
			    ((flags & GLOB_NOESCAPE) ? FNM_NOESCAPE : 0)) == 0)
		{
		    struct globlink *new_w
		    = (struct globlink *)__alloca(sizeof(struct globlink));
		    if (len == 0)
			len = strlen(name);
		    new_w->name
			= (char *)XtMalloc(len + ((flags & GLOB_MARK) ? 1 : 0) + 1);
		    if (new_w->name == NULL)
			goto memory_error;
		    bcopy(name, (__ptr_t) new_w->name, len);
		    new_w->name[len] = '\0';
#ifdef READDIR_LEXICOGRAPHIC_ORDER
		    if (names == NULL)
			names = tail = new_w;
		    else
		    {
			tail->next = new_w;
			tail = new_w;
		    }
		    new_w->next = NULL;
#else
		    new_w->next = names;
		    names = new_w;
#endif
		    ++nfound;
		}
	    }
    }

    if (nfound == 0 && (flags & GLOB_NOCHECK))
    {
	size_t len = strlen(pattern);
	nfound = 1;
	names = (struct globlink *)__alloca(sizeof(struct globlink));
	names->next = NULL;
	names->name = (char *)XtMalloc(len + 1);
	if (names->name == NULL)
	    goto memory_error;
	bcopy(pattern, names->name, len);
	names->name[len] = '\0';
    }

    pglob->gl_pathv
	= (char **)XtRealloc((char *)pglob->gl_pathv,
			     (pglob->gl_pathc +
			      ((flags & GLOB_DOOFFS) ? pglob->gl_offs : 0) +
			      nfound + 1) *
			     sizeof(char *));
    if (pglob->gl_pathv == NULL)
	goto memory_error;

    if (flags & GLOB_DOOFFS)
	while (pglob->gl_pathc < pglob->gl_offs)
	    pglob->gl_pathv[pglob->gl_pathc++] = NULL;

    for (; names != NULL; names = names->next)
	pglob->gl_pathv[pglob->gl_pathc++] = names->name;
    pglob->gl_pathv[pglob->gl_pathc] = NULL;

    pglob->gl_flags = flags;

    if (stream != NULL)
    {
	int save = errno;
	if (__glob_closedir_hook)
	    (*__glob_closedir_hook) (stream);
	else
	    (void)closedir((DIR *) stream);
	errno = save;
    }
    return nfound == 0 ? GLOB_NOMATCH : 0;

  memory_error:
    {
	int save = errno;
	if (__glob_closedir_hook)
	    (*__glob_closedir_hook) (stream);
	else
	    (void)closedir((DIR *) stream);
	errno = save;
    }
    while (names != NULL)
    {
	if (names->name != NULL)
	    XtFree((__ptr_t) names->name);
	names = names->next;
    }
    return GLOB_NOSPACE;
}

#ifdef __EMX__
/* Under OS/2 we may need to deal with drive letters ...*/

static char *GetDriveMap(void)
{
  /* returns a string containing a list of all drives: e.g. "C: D: E:" */

  static char drivelist[256];   /* so we'll never have a memory leak beyond 256 bytes */
  static char tmpstr[4];
  ULONG  CurDrive;
  ULONG  DriveMap;
  int    dnum;
  int    start = 3;
 
  drivelist[0] = '\0';
  tmpstr[1] = ':';
  tmpstr[2] = ' ';
  tmpstr[3] = '\0';
/*
  DosError(0);
*/
  DosQueryCurrentDisk(&CurDrive, &DriveMap);
  DriveMap>>=start-1;
  for (dnum = start; dnum <= 26; dnum++) {
     if ((DriveMap & (ULONG)1)) {
        tmpstr[0] = (char)dnum+'A'-1;
        strcat(drivelist, tmpstr);
   }
      DriveMap>>=1; 
  }
 
  if (drivelist[strlen(drivelist)-1]== ' ')
    drivelist[strlen(drivelist)-1] = '\0';

/*
  DosError(1);
*/
  return drivelist;
}
#endif
