make-dfsg/lib/glob.c

/* Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999 Free
Software Foundation, Inc.

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; see the file COPYING.LIB.  If not, write to the Free
Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
USA.  */

/* AIX requires this to be the first thing in the file.  */
#if defined _AIX && !defined __GNUC__
 #pragma alloca
#endif

#ifdef	HAVE_CONFIG_H
# include <config.h>
#endif

/* Enable GNU extensions in glob.h.  */
#ifndef _GNU_SOURCE
# define _GNU_SOURCE	1
#endif

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

/* Outcomment the following line for production quality code.  */
/* #define NDEBUG 1 */
#include <assert.h>

#include <stdio.h>		/* Needed on stupid SunOS for assert.  */


/* Comment out all this code if we are using the GNU C Library, and are not
   actually compiling the library itself.  This code is part of the GNU C
   Library, but also included in many other GNU distributions.  Compiling
   and linking in this code is a waste when using the GNU C library
   (especially if it is a shared library).  Rather than having every GNU
   program understand `configure --with-gnu-libc' and omit the object files,
   it is simpler to just do this in the source for each such file.  */

#define GLOB_INTERFACE_VERSION 1
#if !defined _LIBC && defined __GNU_LIBRARY__ && __GNU_LIBRARY__ > 1
# include <gnu-versions.h>
# if _GNU_GLOB_INTERFACE_VERSION == GLOB_INTERFACE_VERSION
#  define ELIDE_CODE
# endif
#endif

#ifndef ELIDE_CODE

#if defined STDC_HEADERS || defined __GNU_LIBRARY__
# include <stddef.h>
#endif

#if defined HAVE_UNISTD_H || defined _LIBC
# include <unistd.h>
# ifndef POSIX
#  ifdef _POSIX_VERSION
#   define POSIX
#  endif
# endif
#endif

#if !defined _AMIGA && !defined VMS && !defined WINDOWS32
# include <pwd.h>
#endif

#if !defined __GNU_LIBRARY__ && !defined STDC_HEADERS
extern int errno;
#endif
#ifndef __set_errno
# define __set_errno(val) errno = (val)
#endif

#ifndef	NULL
# define NULL	0
#endif


#if defined HAVE_DIRENT_H || defined __GNU_LIBRARY__
# include <dirent.h>
# define NAMLEN(dirent) strlen((dirent)->d_name)
#else
# define dirent direct
# define NAMLEN(dirent) (dirent)->d_namlen
# ifdef HAVE_SYS_NDIR_H
#  include <sys/ndir.h>
# endif
# ifdef HAVE_SYS_DIR_H
#  include <sys/dir.h>
# endif
# ifdef HAVE_NDIR_H
#  include <ndir.h>
# endif
# ifdef HAVE_VMSDIR_H
#  include "vmsdir.h"
# endif /* HAVE_VMSDIR_H */
#endif


/* In GNU systems, <dirent.h> defines this macro for us.  */
#ifdef _D_NAMLEN
# undef NAMLEN
# define NAMLEN(d) _D_NAMLEN(d)
#endif

/* When used in the GNU libc the symbol _DIRENT_HAVE_D_TYPE is available
   if the `d_type' member for `struct dirent' is available.  */
#if defined(_DIRENT_HAVE_D_TYPE) || defined(HAVE_STRUCT_DIRENT_D_TYPE)
# define HAVE_D_TYPE	1
#endif


#if (defined POSIX || defined WINDOWS32) && !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.  */

extern char *getenv ();

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

extern char *malloc (), *realloc ();
extern void free ();

extern void qsort ();
extern void abort (), exit ();

#endif	/* Standard headers.  */

#ifndef	ANSI_STRING

# ifndef bzero
extern void bzero ();
# endif
# ifndef bcopy
extern void bcopy ();
# endif

# define memcpy(d, s, n)	bcopy ((s), (d), (n))
# define strrchr	rindex
/* memset is only used for zero here, but let's be paranoid.  */
# define memset(s, better_be_zero, n) \
  ((void) ((better_be_zero) == 0 ? (bzero((s), (n)), 0) : (abort(), 0)))
#endif	/* Not ANSI_STRING.  */

#if !defined HAVE_STRCOLL && !defined _LIBC
# define strcoll	strcmp
#endif

#if !defined HAVE_MEMPCPY && __GLIBC__ - 0 == 2 && __GLIBC_MINOR__ >= 1
# define HAVE_MEMPCPY	1
# undef  mempcpy
# define mempcpy(Dest, Src, Len) __mempcpy (Dest, Src, Len)
#endif

#if !defined __GNU_LIBRARY__ && !defined __DJGPP__
# ifdef	__GNUC__
__inline
# endif
# ifndef __SASC
#  ifdef WINDOWS32
static void *
my_realloc (void *p, unsigned int n)
#  else
static char *
my_realloc (p, n)
     char *p;
     unsigned int n;
#  endif
{
  /* These casts are the for sake of the broken Ultrix compiler,
     which warns of illegal pointer combinations otherwise.  */
  if (p == NULL)
    return (char *) malloc (n);
  return (char *) realloc (p, n);
}
# define	realloc	my_realloc
# endif /* __SASC */
#endif /* __GNU_LIBRARY__ || __DJGPP__ */


#if !defined __alloca && !defined __GNU_LIBRARY__

# ifdef	__GNUC__
#  undef alloca
#  define alloca(n)	__builtin_alloca (n)
# else	/* Not GCC.  */
#  ifdef HAVE_ALLOCA_H
#   include <alloca.h>
#  else	/* Not HAVE_ALLOCA_H.  */
#   ifndef _AIX
#    ifdef WINDOWS32
#     include <malloc.h>
#    else
extern char *alloca ();
#    endif /* WINDOWS32 */
#   endif /* Not _AIX.  */
#  endif /* sparc or HAVE_ALLOCA_H.  */
# endif	/* GCC.  */
#endif

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

#ifdef _LIBC
# undef strdup
# define strdup(str) __strdup (str)
# define sysconf(id) __sysconf (id)
# define closedir(dir) __closedir (dir)
# define opendir(name) __opendir (name)
# define readdir(str) __readdir (str)
# define getpwnam_r(name, bufp, buf, len, res) \
   __getpwnam_r (name, bufp, buf, len, res)
# ifndef __stat
#  define __stat(fname, buf) __xstat (_STAT_VER, fname, buf)
# endif
#endif

#if !(defined STDC_HEADERS || defined __GNU_LIBRARY__)
# 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.  */
#ifndef __GNU_LIBRARY__
# undef	FNM_PATHNAME
# undef	FNM_NOESCAPE
# undef	FNM_PERIOD
#endif
#include <fnmatch.h>

/* Some system header files erroneously define these.
   We want our own definitions from <glob.h> to take precedence.  */
#ifndef __GNU_LIBRARY__
# undef	GLOB_ERR
# undef	GLOB_MARK
# undef	GLOB_NOSORT
# undef	GLOB_DOOFFS
# undef	GLOB_NOCHECK
# undef	GLOB_APPEND
# undef	GLOB_NOESCAPE
# undef	GLOB_PERIOD
#endif
#include <glob.h>

#if !defined __alloca
# define __alloca alloca
#endif

#if !defined __stat
# define __stat stat
#endif

#ifdef HAVE_GETLOGIN_R
extern int getlogin_r __P ((char *, size_t));
#else
extern char *getlogin __P ((void));
#endif

static
#if __GNUC__ - 0 >= 2
inline
#endif
const char *next_brace_sub __P ((const char *begin));
static int glob_in_dir __P ((const char *pattern, const char *directory,
			     int flags,
			     int (*errfunc) (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));

#if !defined _LIBC || !defined NO_GLOB_PATTERN_P
int __glob_pattern_p __P ((const char *pattern, int quote));
#endif

/* Find the end of the sub-pattern in a brace expression.  We define
   this as an inline function if the compiler permits.  */
static
#if __GNUC__ - 0 >= 2
inline
#endif
const char *
next_brace_sub (begin)
     const char *begin;
{
  unsigned int depth = 0;
  const char *cp = begin;

  while (1)
    {
      if (depth == 0)
	{
	  if (*cp != ',' && *cp != '}' && *cp != '\0')
	    {
	      if (*cp == '{')
		++depth;
	      ++cp;
	      continue;
	    }
	}
      else
	{
	  while (*cp != '\0' && (*cp != '}' || depth > 0))
	    {
	      if (*cp == '}')
		--depth;
	      ++cp;
	    }
	  if (*cp == '\0')
	    /* An incorrectly terminated brace expression.  */
	    return NULL;

	  continue;
	}
      break;
    }

  return cp;
}

/* 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_ABORTED; if it returns zero, the error is ignored.
   If memory cannot be allocated for PGLOB, GLOB_NOSPACE is returned.
   Otherwise, `glob' returns zero.  */
int
glob (pattern, flags, errfunc, pglob)
     const char *pattern;
     int flags;
     int (*errfunc) __P ((const char *, int));
     glob_t *pglob;
{
  const char *filename;
  const char *dirname;
  size_t dirlen;
  int status;
  size_t oldcount;

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

  /* POSIX requires all slashes to be matched.  This means that with
     a trailing slash we must match only directories.  */
  if (pattern[0] && pattern[strlen (pattern) - 1] == '/')
    flags |= GLOB_ONLYDIR;

  if (flags & GLOB_BRACE)
    {
      const char *begin = strchr (pattern, '{');
      if (begin != NULL)
	{
	  /* Allocate working buffer large enough for our work.  Note that
	    we have at least an opening and closing brace.  */
	  size_t firstc;
	  char *alt_start;
	  const char *p;
	  const char *next;
	  const char *rest;
	  size_t rest_len;
#ifdef __GNUC__
	  char onealt[strlen (pattern) - 1];
#else
	  char *onealt = (char *) malloc (strlen (pattern) - 1);
	  if (onealt == NULL)
	    {
	      if (!(flags & GLOB_APPEND))
		globfree (pglob);
	      return GLOB_NOSPACE;
	    }
#endif

	  /* We know the prefix for all sub-patterns.  */
#ifdef HAVE_MEMPCPY
	  alt_start = mempcpy (onealt, pattern, begin - pattern);
#else
	  memcpy (onealt, pattern, begin - pattern);
	  alt_start = &onealt[begin - pattern];
#endif

	  /* Find the first sub-pattern and at the same time find the
	     rest after the closing brace.  */
	  next = next_brace_sub (begin + 1);
	  if (next == NULL)
	    {
	      /* It is an illegal expression.  */
#ifndef __GNUC__
	      free (onealt);
#endif
	      return glob (pattern, flags & ~GLOB_BRACE, errfunc, pglob);
	    }

	  /* Now find the end of the whole brace expression.  */
	  rest = next;
	  while (*rest != '}')
	    {
	      rest = next_brace_sub (rest + 1);
	      if (rest == NULL)
		{
		  /* It is an illegal expression.  */
#ifndef __GNUC__
		  free (onealt);
#endif
		  return glob (pattern, flags & ~GLOB_BRACE, errfunc, pglob);
		}
	    }
	  /* Please note that we now can be sure the brace expression
	     is well-formed.  */
	  rest_len = strlen (++rest) + 1;

	  /* We have a brace expression.  BEGIN points to the opening {,
	     NEXT points past the terminator of the first element, and END
	     points past the final }.  We will accumulate result names from
	     recursive runs for each brace alternative in the buffer using
	     GLOB_APPEND.  */

	  if (!(flags & GLOB_APPEND))
	    {
	      /* This call is to set a new vector, so clear out the
		 vector so we can append to it.  */
	      pglob->gl_pathc = 0;
	      pglob->gl_pathv = NULL;
	    }
	  firstc = pglob->gl_pathc;

	  p = begin + 1;
	  while (1)
	    {
	      int result;

	      /* Construct the new glob expression.  */
#ifdef HAVE_MEMPCPY
	      mempcpy (mempcpy (alt_start, p, next - p), rest, rest_len);
#else
	      memcpy (alt_start, p, next - p);
	      memcpy (&alt_start[next - p], rest, rest_len);
#endif

	      result = glob (onealt,
			     ((flags & ~(GLOB_NOCHECK|GLOB_NOMAGIC))
			      | GLOB_APPEND), errfunc, pglob);

	      /* If we got an error, return it.  */
	      if (result && result != GLOB_NOMATCH)
		{
#ifndef __GNUC__
		  free (onealt);
#endif
		  if (!(flags & GLOB_APPEND))
		    globfree (pglob);
		  return result;
		}

	      if (*next == '}')
		/* We saw the last entry.  */
		break;

	      p = next + 1;
	      next = next_brace_sub (p);
	      assert (next != NULL);
	    }

#ifndef __GNUC__
	  free (onealt);
#endif

	  if (pglob->gl_pathc != firstc)
	    /* We found some entries.  */
	    return 0;
	  else if (!(flags & (GLOB_NOCHECK|GLOB_NOMAGIC)))
	    return GLOB_NOMATCH;
	}
    }

  /* Find the filename.  */
  filename = strrchr (pattern, '/');
#if defined __MSDOS__ || defined WINDOWS32
  /* The case of "d:pattern".  Since `:' is not allowed in
     file names, we can safely assume that wherever it
     happens in pattern, it signals the filename part.  This
     is so we could some day support patterns like "[a-z]:foo".  */
  if (filename == NULL)
    filename = strchr (pattern, ':');
#endif /* __MSDOS__ || WINDOWS32 */
  if (filename == NULL)
    {
      /* This can mean two things: a simple name or "~name".  The later
	 case is nothing but a notation for a directory.  */
      if ((flags & (GLOB_TILDE|GLOB_TILDE_CHECK)) && pattern[0] == '~')
	{
	  dirname = pattern;
	  dirlen = strlen (pattern);

	  /* Set FILENAME to NULL as a special flag.  This is ugly but
	     other solutions would require much more code.  We test for
	     this special case below.  */
	  filename = NULL;
	}
      else
	{
	  filename = pattern;
#ifdef _AMIGA
	  dirname = "";
#else
	  dirname = ".";
#endif
	  dirlen = 0;
	}
    }
  else if (filename == pattern)
    {
      /* "/pattern".  */
      dirname = "/";
      dirlen = 1;
      ++filename;
    }
  else
    {
      char *newp;
      dirlen = filename - pattern;
#if defined __MSDOS__ || defined WINDOWS32
      if (*filename == ':'
	  || (filename > pattern + 1 && filename[-1] == ':'))
	{
	  char *drive_spec;

	  ++dirlen;
	  drive_spec = (char *) __alloca (dirlen + 1);
#ifdef HAVE_MEMPCPY
	  *((char *) mempcpy (drive_spec, pattern, dirlen)) = '\0';
#else
	  memcpy (drive_spec, pattern, dirlen);
	  drive_spec[dirlen] = '\0';
#endif
	  /* For now, disallow wildcards in the drive spec, to
	     prevent infinite recursion in glob.  */
	  if (__glob_pattern_p (drive_spec, !(flags & GLOB_NOESCAPE)))
	    return GLOB_NOMATCH;
	  /* If this is "d:pattern", we need to copy `:' to DIRNAME
	     as well.  If it's "d:/pattern", don't remove the slash
	     from "d:/", since "d:" and "d:/" are not the same.*/
	}
#endif
      newp = (char *) __alloca (dirlen + 1);
#ifdef HAVE_MEMPCPY
      *((char *) mempcpy (newp, pattern, dirlen)) = '\0';
#else
      memcpy (newp, pattern, dirlen);
      newp[dirlen] = '\0';
#endif
      dirname = newp;
      ++filename;

      if (filename[0] == '\0'
#if defined __MSDOS__ || defined WINDOWS32
          && dirname[dirlen - 1] != ':'
	  && (dirlen < 3 || dirname[dirlen - 2] != ':'
	      || dirname[dirlen - 1] != '/')
#endif
	  && dirlen > 1)
	/* "pattern/".  Expand "pattern", appending slashes.  */
	{
	  int val = 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;

#ifndef VMS
  if ((flags & (GLOB_TILDE|GLOB_TILDE_CHECK)) && dirname[0] == '~')
    {
      if (dirname[1] == '\0' || dirname[1] == '/')
	{
	  /* Look up home directory.  */
#ifdef VMS
/* This isn't obvious, RTLs of DECC and VAXC know about "HOME" */
          const char *home_dir = getenv ("SYS$LOGIN");
#else
          const char *home_dir = getenv ("HOME");
#endif
# ifdef _AMIGA
	  if (home_dir == NULL || home_dir[0] == '\0')
	    home_dir = "SYS:";
# else
#  ifdef WINDOWS32
	  if (home_dir == NULL || home_dir[0] == '\0')
            home_dir = "c:/users/default"; /* poor default */
#  else
#   ifdef VMS
/* Again, this isn't obvious, if "HOME" isn't known "SYS$LOGIN" should be set */
	  if (home_dir == NULL || home_dir[0] == '\0')
	    home_dir = "SYS$DISK:[]";
#   else
	  if (home_dir == NULL || home_dir[0] == '\0')
	    {
	      int success;
	      char *name;
#   if defined HAVE_GETLOGIN_R || defined _LIBC
	      size_t buflen = sysconf (_SC_LOGIN_NAME_MAX) + 1;

	      if (buflen == 0)
		/* `sysconf' does not support _SC_LOGIN_NAME_MAX.  Try
		   a moderate value.  */
		buflen = 20;
	      name = (char *) __alloca (buflen);

	      success = getlogin_r (name, buflen) >= 0;
#   else
	      success = (name = getlogin ()) != NULL;
#   endif
	      if (success)
		{
		  struct passwd *p;
#   if defined HAVE_GETPWNAM_R || defined _LIBC
		  size_t pwbuflen = sysconf (_SC_GETPW_R_SIZE_MAX);
		  char *pwtmpbuf;
		  struct passwd pwbuf;
		  int save = errno;

		  if (pwbuflen == -1)
		    /* `sysconf' does not support _SC_GETPW_R_SIZE_MAX.
		       Try a moderate value.  */
		    pwbuflen = 1024;
		  pwtmpbuf = (char *) __alloca (pwbuflen);

		  while (getpwnam_r (name, &pwbuf, pwtmpbuf, pwbuflen, &p)
			 != 0)
		    {
		      if (errno != ERANGE)
			{
			  p = NULL;
			  break;
			}
		      pwbuflen *= 2;
		      pwtmpbuf = (char *) __alloca (pwbuflen);
		      __set_errno (save);
		    }
#   else
		  p = getpwnam (name);
#   endif
		  if (p != NULL)
		    home_dir = p->pw_dir;
		}
	    }
	  if (home_dir == NULL || home_dir[0] == '\0')
	    {
	      if (flags & GLOB_TILDE_CHECK)
		return GLOB_NOMATCH;
	      else
		home_dir = "~"; /* No luck.  */
	    }
#   endif /* VMS */
#  endif /* WINDOWS32 */
# endif
	  /* Now construct the full directory.  */
	  if (dirname[1] == '\0')
	    dirname = home_dir;
	  else
	    {
	      char *newp;
	      size_t home_len = strlen (home_dir);
	      newp = (char *) __alloca (home_len + dirlen);
# ifdef HAVE_MEMPCPY
	      mempcpy (mempcpy (newp, home_dir, home_len),
		       &dirname[1], dirlen);
# else
	      memcpy (newp, home_dir, home_len);
	      memcpy (&newp[home_len], &dirname[1], dirlen);
# endif
	      dirname = newp;
	    }
	}
# if !defined _AMIGA && !defined WINDOWS32 && !defined VMS
      else
	{
	  char *end_name = strchr (dirname, '/');
	  const char *user_name;
	  const char *home_dir;

	  if (end_name == NULL)
	    user_name = dirname + 1;
	  else
	    {
	      char *newp;
	      newp = (char *) __alloca (end_name - dirname);
# ifdef HAVE_MEMPCPY
	      *((char *) mempcpy (newp, dirname + 1, end_name - dirname))
		= '\0';
# else
	      memcpy (newp, dirname + 1, end_name - dirname);
	      newp[end_name - dirname - 1] = '\0';
# endif
	      user_name = newp;
	    }

	  /* Look up specific user's home directory.  */
	  {
	    struct passwd *p;
#  if defined HAVE_GETPWNAM_R || defined _LIBC
	    size_t buflen = sysconf (_SC_GETPW_R_SIZE_MAX);
	    char *pwtmpbuf;
	    struct passwd pwbuf;
	    int save = errno;

	    if (buflen == -1)
	      /* `sysconf' does not support _SC_GETPW_R_SIZE_MAX.  Try a
		 moderate value.  */
	      buflen = 1024;
	    pwtmpbuf = (char *) __alloca (buflen);

	    while (getpwnam_r (user_name, &pwbuf, pwtmpbuf, buflen, &p) != 0)
	      {
		if (errno != ERANGE)
		  {
		    p = NULL;
		    break;
		  }
		buflen *= 2;
		pwtmpbuf = __alloca (buflen);
		__set_errno (save);
	      }
#  else
	    p = getpwnam (user_name);
#  endif
	    if (p != NULL)
	      home_dir = p->pw_dir;
	    else
	      home_dir = NULL;
	  }
	  /* If we found a home directory use this.  */
	  if (home_dir != NULL)
	    {
	      char *newp;
	      size_t home_len = strlen (home_dir);
	      size_t rest_len = end_name == NULL ? 0 : strlen (end_name);
	      newp = (char *) __alloca (home_len + rest_len + 1);
#  ifdef HAVE_MEMPCPY
	      *((char *) mempcpy (mempcpy (newp, home_dir, home_len),
				  end_name, rest_len)) = '\0';
#  else
	      memcpy (newp, home_dir, home_len);
	      memcpy (&newp[home_len], end_name, rest_len);
	      newp[home_len + rest_len] = '\0';
#  endif
	      dirname = newp;
	    }
	  else
	    if (flags & GLOB_TILDE_CHECK)
	      /* We have to regard it as an error if we cannot find the
		 home directory.  */
	      return GLOB_NOMATCH;
	}
# endif	/* Not Amiga && not WINDOWS32 && not VMS.  */
    }
#endif	/* Not VMS.  */

  /* Now test whether we looked for "~" or "~NAME".  In this case we
     can give the answer now.  */
  if (filename == NULL)
    {
      struct stat st;

      /* Return the directory if we don't check for error or if it exists.  */
      if ((flags & GLOB_NOCHECK)
	  || (((flags & GLOB_ALTDIRFUNC)
	       ? (*pglob->gl_stat) (dirname, &st)
	       : __stat (dirname, &st)) == 0
	      && S_ISDIR (st.st_mode)))
	{
	  pglob->gl_pathv
	    = (char **) realloc (pglob->gl_pathv,
				 (pglob->gl_pathc +
				  ((flags & GLOB_DOOFFS) ?
				   pglob->gl_offs : 0) +
				  1 + 1) *
				 sizeof (char *));
	  if (pglob->gl_pathv == NULL)
	    return GLOB_NOSPACE;

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

#if defined HAVE_STRDUP || defined _LIBC
	  pglob->gl_pathv[pglob->gl_pathc] = strdup (dirname);
#else
	  {
	    size_t len = strlen (dirname) + 1;
	    char *dircopy = malloc (len);
	    if (dircopy != NULL)
	      pglob->gl_pathv[pglob->gl_pathc] = memcpy (dircopy, dirname,
							 len);
	  }
#endif
	  if (pglob->gl_pathv[pglob->gl_pathc] == NULL)
	    {
	      free (pglob->gl_pathv);
	      return GLOB_NOSPACE;
	    }
	  pglob->gl_pathv[++pglob->gl_pathc] = NULL;
	  pglob->gl_flags = flags;

	  return 0;
	}

      /* Not found.  */
      return GLOB_NOMATCH;
    }

  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 size_t i;

      status = glob (dirname,
		     ((flags & (GLOB_ERR | GLOB_NOCHECK | GLOB_NOESCAPE))
		      | GLOB_NOSORT | GLOB_ONLYDIR),
		     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 old_pathc;

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

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

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

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

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

      flags |= GLOB_MAGCHAR;

      /* We have ignored the GLOB_NOCHECK flag in the `glob_in_dir' calls.
	 But if we have not found any matching entry and thie GLOB_NOCHECK
	 flag was set we must return the list consisting of the disrectory
	 names followed by the filename.  */
      if (pglob->gl_pathc == oldcount)
	{
	  /* No matches.  */
	  if (flags & GLOB_NOCHECK)
	    {
	      size_t filename_len = strlen (filename) + 1;
	      char **new_pathv;
	      struct stat st;

	      /* This is an pessimistic guess about the size.  */
	      pglob->gl_pathv
		= (char **) realloc (pglob->gl_pathv,
				     (pglob->gl_pathc +
				      ((flags & GLOB_DOOFFS) ?
				       pglob->gl_offs : 0) +
				      dirs.gl_pathc + 1) *
				     sizeof (char *));
	      if (pglob->gl_pathv == NULL)
		{
		  globfree (&dirs);
		  return GLOB_NOSPACE;
		}

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

	      for (i = 0; i < dirs.gl_pathc; ++i)
		{
		  const char *dir = dirs.gl_pathv[i];
		  size_t dir_len = strlen (dir);

		  /* First check whether this really is a directory.  */
		  if (((flags & GLOB_ALTDIRFUNC)
		       ? (*pglob->gl_stat) (dir, &st) : __stat (dir, &st)) != 0
		      || !S_ISDIR (st.st_mode))
		    /* No directory, ignore this entry.  */
		    continue;

		  pglob->gl_pathv[pglob->gl_pathc] = malloc (dir_len + 1
							     + filename_len);
		  if (pglob->gl_pathv[pglob->gl_pathc] == NULL)
		    {
		      globfree (&dirs);
		      globfree (pglob);
		      return GLOB_NOSPACE;
		    }

#ifdef HAVE_MEMPCPY
		  mempcpy (mempcpy (mempcpy (pglob->gl_pathv[pglob->gl_pathc],
					     dir, dir_len),
				    "/", 1),
			   filename, filename_len);
#else
		  memcpy (pglob->gl_pathv[pglob->gl_pathc], dir, dir_len);
		  pglob->gl_pathv[pglob->gl_pathc][dir_len] = '/';
		  memcpy (&pglob->gl_pathv[pglob->gl_pathc][dir_len + 1],
			  filename, filename_len);
#endif
		  ++pglob->gl_pathc;
		}

	      pglob->gl_pathv[pglob->gl_pathc] = NULL;
	      pglob->gl_flags = flags;

	      /* Now we know how large the gl_pathv vector must be.  */
	      new_pathv = (char **) realloc (pglob->gl_pathv,
					     ((pglob->gl_pathc + 1)
					      * sizeof (char *)));
	      if (new_pathv != NULL)
		pglob->gl_pathv = new_pathv;
	    }
	  else
	    return GLOB_NOMATCH;
	}

      globfree (&dirs);
    }
  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.  */
	  size_t ignore = oldcount;

	  if ((flags & GLOB_DOOFFS) && ignore < pglob->gl_offs)
	    ignore = pglob->gl_offs;

	  if (prefix_array (dirname,
			    &pglob->gl_pathv[ignore],
			    pglob->gl_pathc - ignore))
	    {
	      globfree (pglob);
	      return GLOB_NOSPACE;
	    }
	}
    }

  if (flags & GLOB_MARK)
    {
      /* Append slashes to directory names.  */
      size_t i;
      struct stat st;
      for (i = oldcount; i < pglob->gl_pathc; ++i)
	if (((flags & GLOB_ALTDIRFUNC)
	     ? (*pglob->gl_stat) (pglob->gl_pathv[i], &st)
	     : __stat (pglob->gl_pathv[i], &st)) == 0
	    && S_ISDIR (st.st_mode))
	  {
 	    size_t len = strlen (pglob->gl_pathv[i]) + 2;
	    char *new = realloc (pglob->gl_pathv[i], len);
 	    if (new == NULL)
	      {
		globfree (pglob);
		return GLOB_NOSPACE;
	      }
	    strcpy (&new[len - 2], "/");
	    pglob->gl_pathv[i] = new;
	  }
    }

  if (!(flags & GLOB_NOSORT))
    {
      /* Sort the vector.  */
      int non_sort = oldcount;

      if ((flags & GLOB_DOOFFS) && pglob->gl_offs > oldcount)
	non_sort = pglob->gl_offs;

      qsort ((__ptr_t) &pglob->gl_pathv[non_sort],
	     pglob->gl_pathc - non_sort,
	     sizeof (char *), collated_compare);
    }

  return 0;
}


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


/* Do a collated comparison of A and B.  */
static int
collated_compare (a, b)
     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 (dirname, array, n)
     const char *dirname;
     char **array;
     size_t n;
{
  register size_t i;
  size_t dirlen = strlen (dirname);
#if defined __MSDOS__ || defined WINDOWS32
  int sep_char = '/';
# define DIRSEP_CHAR sep_char
#else
# define DIRSEP_CHAR '/'
#endif

  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;
#if defined __MSDOS__ || defined WINDOWS32
  else if (dirlen > 1)
    {
      if (dirname[dirlen - 1] == '/' && dirname[dirlen - 2] == ':')
	/* DIRNAME is "d:/".  Don't prepend the slash from DIRNAME.  */
	--dirlen;
      else if (dirname[dirlen - 1] == ':')
	{
	  /* DIRNAME is "d:".  Use `:' instead of `/'.  */
	  --dirlen;
	  sep_char = ':';
	}
    }
#endif

  for (i = 0; i < n; ++i)
    {
      size_t eltlen = strlen (array[i]) + 1;
      char *new = (char *) malloc (dirlen + 1 + eltlen);
      if (new == NULL)
	{
	  while (i > 0)
	    free ((__ptr_t) array[--i]);
	  return 1;
	}

#ifdef HAVE_MEMPCPY
      {
	char *endp = (char *) mempcpy (new, dirname, dirlen);
	*endp++ = DIRSEP_CHAR;
	mempcpy (endp, array[i], eltlen);
      }
#else
      memcpy (new, dirname, dirlen);
      new[dirlen] = DIRSEP_CHAR;
      memcpy (&new[dirlen + 1], array[i], eltlen);
#endif
      free ((__ptr_t) array[i]);
      array[i] = new;
    }

  return 0;
}


/* We must not compile this function twice.  */
#if !defined _LIBC || !defined NO_GLOB_PATTERN_P
/* Return nonzero if PATTERN contains any metacharacters.
   Metacharacters can be quoted with backslashes if QUOTE is nonzero.  */
int
__glob_pattern_p (pattern, quote)
     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[1] != '\0')
	  ++p;
	break;

      case '[':
	open = 1;
	break;

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

  return 0;
}
# ifdef _LIBC
weak_alias (__glob_pattern_p, glob_pattern_p)
# endif
#endif


/* 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 (pattern, directory, flags, errfunc, pglob)
     const char *pattern;
     const char *directory;
     int flags;
     int (*errfunc) __P ((const char *, int));
     glob_t *pglob;
{
  __ptr_t stream = NULL;

  struct globlink
    {
      struct globlink *next;
      char *name;
    };
  struct globlink *names = NULL;
  size_t nfound;
  int meta;
  int save;

#ifdef VMS
  if (*directory == 0)
    directory = "[]";
#endif
  meta = __glob_pattern_p (pattern, !(flags & GLOB_NOESCAPE));
  if (meta == 0)
    {
      if (flags & (GLOB_NOCHECK|GLOB_NOMAGIC))
	/* We need not do any tests.  The PATTERN contains no meta
	   characters and we must not return an error therefore the
	   result will always contain exactly one name.  */
	flags |= GLOB_NOCHECK;
      else
	{
	  /* Since we use the normal file functions we can also use stat()
	     to verify the file is there.  */
	  struct stat st;
	  size_t patlen = strlen (pattern);
	  size_t dirlen = strlen (directory);
	  char *fullname = (char *) __alloca (dirlen + 1 + patlen + 1);

# ifdef HAVE_MEMPCPY
	  mempcpy (mempcpy (mempcpy (fullname, directory, dirlen),
			    "/", 1),
		   pattern, patlen + 1);
# else
	  memcpy (fullname, directory, dirlen);
	  fullname[dirlen] = '/';
	  memcpy (&fullname[dirlen + 1], pattern, patlen + 1);
# endif
	  if (((flags & GLOB_ALTDIRFUNC)
	       ? (*pglob->gl_stat) (fullname, &st)
	       : __stat (fullname, &st)) == 0)
	    /* We found this file to be existing.  Now tell the rest
	       of the function to copy this name into the result.  */
	    flags |= GLOB_NOCHECK;
	}

      nfound = 0;
    }
  else
    {
      if (pattern[0] == '\0')
	{
	  /* This is a special case for matching directories like in
	     "*a/".  */
	  names = (struct globlink *) __alloca (sizeof (struct globlink));
	  names->name = (char *) malloc (1);
	  if (names->name == NULL)
	    goto memory_error;
	  names->name[0] = '\0';
	  names->next = NULL;
	  nfound = 1;
	  meta = 0;
	}
      else
	{
	  stream = ((flags & GLOB_ALTDIRFUNC)
		    ? (*pglob->gl_opendir) (directory)
		    : (__ptr_t) opendir (directory));
	  if (stream == NULL)
	    {
	      if (errno != ENOTDIR
		  && ((errfunc != NULL && (*errfunc) (directory, errno))
		      || (flags & GLOB_ERR)))
		return GLOB_ABORTED;
	      nfound = 0;
	      meta = 0;
	    }
	  else
	    {
	      int fnm_flags = ((!(flags & GLOB_PERIOD) ? FNM_PERIOD : 0)
			       | ((flags & GLOB_NOESCAPE) ? FNM_NOESCAPE : 0)
#if defined HAVE_CASE_INSENSITIVE_FS
				   | FNM_CASEFOLD
#endif
				   );
	      nfound = 0;
	      flags |= GLOB_MAGCHAR;

	      while (1)
		{
		  const char *name;
		  size_t len;
		  struct dirent *d = ((flags & GLOB_ALTDIRFUNC)
				      ? (*pglob->gl_readdir) (stream)
				      : readdir ((DIR *) stream));
		  if (d == NULL)
		    break;
		  if (! REAL_DIR_ENTRY (d))
		    continue;

#ifdef HAVE_D_TYPE
		  /* If we shall match only directories use the information
		     provided by the dirent call if possible.  */
		  if ((flags & GLOB_ONLYDIR)
		      && d->d_type != DT_UNKNOWN && d->d_type != DT_DIR && d->d_type != DT_LNK)
		    continue;
#endif

		  name = d->d_name;

		  if (fnmatch (pattern, name, fnm_flags) == 0)
		    {
		      struct globlink *new = (struct globlink *)
			__alloca (sizeof (struct globlink));
		      len = NAMLEN (d);
		      new->name = (char *) malloc (len + 1);
		      if (new->name == NULL)
			goto memory_error;
#ifdef HAVE_MEMPCPY
		      *((char *) mempcpy ((__ptr_t) new->name, name, len))
			= '\0';
#else
		      memcpy ((__ptr_t) new->name, name, len);
		      new->name[len] = '\0';
#endif
		      new->next = names;
		      names = new;
		      ++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 *) malloc (len + 1);
      if (names->name == NULL)
	goto memory_error;
#ifdef HAVE_MEMPCPY
      *((char *) mempcpy (names->name, pattern, len)) = '\0';
#else
      memcpy (names->name, pattern, len);
      names->name[len] = '\0';
#endif
    }

  if (nfound != 0)
    {
      pglob->gl_pathv
	= (char **) realloc (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;
    }

  save = errno;
  if (stream != NULL)
    {
      if (flags & GLOB_ALTDIRFUNC)
	(*pglob->gl_closedir) (stream);
      else
	closedir ((DIR *) stream);
    }
  __set_errno (save);

  return nfound == 0 ? GLOB_NOMATCH : 0;

 memory_error:
  {
    save = errno;
    if (flags & GLOB_ALTDIRFUNC)
      (*pglob->gl_closedir) (stream);
    else
      closedir ((DIR *) stream);
    __set_errno (save);
  }
  while (names != NULL)
    {
      if (names->name != NULL)
	free ((__ptr_t) names->name);
      names = names->next;
    }
  return GLOB_NOSPACE;
}

#endif	/* Not ELIDE_CODE.  */