/* File tree walker functions.
   Copyright (C) 1996-2004, 2006-2008, 2010 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef FAKECHROOT
# include <config.h>
#endif

#if ((!defined(__FTW64_C) && HAVE_FTW) || (defined(__FTW64_C) && HAVE_FTW64)) \
 && !defined(OPENDIR_CALLS___OPEN) && !defined(OPENDIR_CALLS___OPENDIR2) && !defined(HAVE__XFTW)

#define _GNU_SOURCE

#if __GNUC__
# define alloca __builtin_alloca
#else
# if HAVE_ALLOCA_H
#  include <alloca.h>
# else
#  ifdef _AIX
 #  pragma alloca
#  else
char *alloca ();
#  endif
# endif
#endif

#ifdef _LIBC
# include <dirent.h>
# define NAMLEN(dirent) _D_EXACT_NAMLEN (dirent)
#else
# if HAVE_DIRENT_H
#  include <dirent.h>
#  define NAMLEN(dirent) strlen ((dirent)->d_name)
# else
#  define dirent direct
#  define NAMLEN(dirent) (dirent)->d_namlen
#  if HAVE_SYS_NDIR_H
#   include <sys/ndir.h>
#  endif
#  if HAVE_SYS_DIR_H
#   include <sys/dir.h>
#  endif
#  if HAVE_NDIR_H
#   include <ndir.h>
#  endif
# endif
#endif

#include <errno.h>
#include <fcntl.h>
#include <ftw.h>
#include <limits.h>
#include <search.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

/* By default we have none.  Map the name to the normal functions.  */
#define open_not_cancel(name, flags, mode) \
  __libc_open (name, flags, mode)
#define open_not_cancel_2(name, flags) \
  __libc_open (name, flags)
#define openat_not_cancel(fd, name, flags, mode) \
  __openat (fd, name, flags, mode)
#define openat_not_cancel_3(fd, name, flags) \
  __openat (fd, name, flags, 0)
#define openat64_not_cancel(fd, name, flags, mode) \
  __openat64 (fd, name, flags, mode)
#define openat64_not_cancel_3(fd, name, flags) \
  __openat64 (fd, name, flags, 0)
#define close_not_cancel(fd) \
  __close (fd)
#define close_not_cancel_no_status(fd) \
  (void) __close (fd)
#define read_not_cancel(fd, buf, n) \
  __read (fd, buf, n)
#define write_not_cancel(fd, buf, n) \
  __write (fd, buf, n)
#define writev_not_cancel_no_status(fd, iov, n) \
  (void) __writev (fd, iov, n)
#define fcntl_not_cancel(fd, cmd, val) \
  __fcntl (fd, cmd, val)
# define waitpid_not_cancel(pid, stat_loc, options) \
  __waitpid (pid, stat_loc, options)

#if HAVE_SYS_PARAM_H || defined _LIBC
# include <sys/param.h>
#endif
#ifdef _LIBC
# include <include/sys/stat.h>
#else
# include <sys/stat.h>
#endif

#include "libfakechroot.h"

#if ! _LIBC && !HAVE_STPCPY && !defined stpcpy
char *stpcpy (char *, const char *);
#endif

#if ! _LIBC && ! defined HAVE_MEMPCPY && ! defined mempcpy
/* Be CAREFUL that there are no side effects in N.  */
# define mempcpy(D, S, N) ((void *) ((char *) memcpy (D, S, N) + (N)))
#endif

/* #define NDEBUG 1 */
#include <assert.h>

#ifndef _LIBC
# undef __chdir
# define __chdir chdir
# undef __close
# define __close close
# undef __closedir
# define __closedir closedir
# undef __fchdir
# define __fchdir fchdir
# undef __fdopendir
# define __fdopendir fdopendir
# undef __getcwd
# define __getcwd getcwd
# undef __mempcpy
# define __mempcpy mempcpy
# undef __open
# define __open open
# undef __openat64
# define __openat64 openat64
# undef __opendir
# define __opendir opendir
# undef __rawmemchr
# define __rawmemchr rawmemchr
# undef __readdir64
# define __readdir64 readdir
# undef __stpcpy
# define __stpcpy stpcpy
# undef __tdestroy
# define __tdestroy tdestroy
# undef __tfind
# define __tfind tfind
# undef __tsearch
# define __tsearch tsearch
# undef internal_function
# define internal_function /* empty */
# undef dirent64
# define dirent64 dirent
# undef MAX
# define MAX(a, b) ((a) > (b) ? (a) : (b))
#endif

/* Arrange to make lstat calls go through the wrapper function
   on systems with an lstat function that does not dereference symlinks
   that are specified with a trailing slash.  */
#if ! _LIBC && ! LSTAT_FOLLOWS_SLASHED_SYMLINK
int rpl_lstat (const char *, struct stat *);
# undef lstat
# define lstat(Name, Stat_buf) rpl_lstat(Name, Stat_buf)
#endif

#ifndef __set_errno
# define __set_errno(Val) errno = (Val)
#endif

/* Support for the LFS API version.  */
#ifndef FTW_NAME
# define FTW_NAME ftw
# define NFTW_NAME nftw
# define NFTW_OLD_NAME __old_nftw
# define NFTW_NEW_NAME __new_nftw
# define INO_T ino_t
# define STAT stat
# ifdef _LIBC
#  define LXSTAT __lxstat
#  define XSTAT __xstat
#  define FXSTATAT __fxstatat
# else
#  define LXSTAT(V,f,sb) lstat (f,sb)
#  define XSTAT(V,f,sb) stat (f,sb)
#  define FXSTATAT(V,d,f,sb,m) fstatat (d, f, sb, m)
# endif
# define FTW_FUNC_T __ftw_func_t
# define NFTW_FUNC_T __nftw_func_t
#endif

#define macro_stringify(name) macro_stringify2(name)
#define macro_stringify2(name) #name
#define FTW_NAME_STRING macro_stringify(FTW_NAME)
#define NFTW_NAME_STRING macro_stringify(NFTW_NAME)
#define NFTW_OLD_NAME_STRING macro_stringify(NFTW_OLD_NAME)
#define NFTW_NEW_NAME_STRING macro_stringify(NFTW_NEW_NAME)

/* We define PATH_MAX if the system does not provide a definition.
   This does not artificially limit any operation.  PATH_MAX is simply
   used as a guesstimate for the expected maximal path length.
   Buffers will be enlarged if necessary.  */
#ifndef PATH_MAX
# define PATH_MAX 1024
#endif

struct dir_data
{
  DIR *stream;
  int streamfd;
  char *content;
};

struct known_object
{
  dev_t dev;
  INO_T ino;
};

struct ftw_data
{
  /* Array with pointers to open directory streams.  */
  struct dir_data **dirstreams;
  size_t actdir;
  size_t maxdir;

  /* Buffer containing name of currently processed object.  */
  char *dirbuf;
  size_t dirbufsize;

  /* Passed as fourth argument to `nftw' callback.  The `base' member
     tracks the content of the `dirbuf'.  */
  struct FTW ftw;

  /* Flags passed to `nftw' function.  0 for `ftw'.  */
  int flags;

  /* Conversion array for flag values.  It is the identity mapping for
     `nftw' calls, otherwise it maps the values to those known by
     `ftw'.  */
  const int *cvt_arr;

  /* Callback function.  We always use the `nftw' form.  */
  NFTW_FUNC_T func;

  /* Device of starting point.  Needed for FTW_MOUNT.  */
  dev_t dev;

  /* Data structure for keeping fingerprints of already processed
     object.  This is needed when not using FTW_PHYS.  */
  void *known_objects;
};


/* Internally we use the FTW_* constants used for `nftw'.  When invoked
   as `ftw', map each flag to the subset of values used by `ftw'.  */
static const int nftw_arr[] =
{
  FTW_F, FTW_D, FTW_DNR, FTW_NS, FTW_SL, FTW_DP, FTW_SLN
};

static const int ftw_arr[] =
{
  FTW_F, FTW_D, FTW_DNR, FTW_NS, FTW_F, FTW_D, FTW_NS
};


/* Forward declarations of local functions.  */
static int ftw_dir (struct ftw_data *data, struct STAT *st,
                    struct dir_data *old_dir) internal_function;


static int
object_compare (const void *p1, const void *p2)
{
  /* We don't need a sophisticated and useful comparison.  We are only
     interested in equality.  However, we must be careful not to
     accidentally compare `holes' in the structure.  */
  const struct known_object *kp1 = p1, *kp2 = p2;
  int cmp1;
  cmp1 = (kp1->ino > kp2->ino) - (kp1->ino < kp2->ino);
  if (cmp1 != 0)
    return cmp1;
  return (kp1->dev > kp2->dev) - (kp1->dev < kp2->dev);
}


static int
add_object (struct ftw_data *data, struct STAT *st)
{
  struct known_object *newp = malloc (sizeof (struct known_object));
  if (newp == NULL)
    return -1;
  newp->dev = st->st_dev;
  newp->ino = st->st_ino;
  return __tsearch (newp, &data->known_objects, object_compare) ? 0 : -1;
}


static inline int
find_object (struct ftw_data *data, struct STAT *st)
{
  struct known_object obj;
  obj.dev = st->st_dev;
  obj.ino = st->st_ino;
  return __tfind (&obj, &data->known_objects, object_compare) != NULL;
}


static inline int
__attribute ((always_inline))
open_dir_stream (int *dfdp, struct ftw_data *data, struct dir_data *dirp)
{
  int result = 0;

  if (data->dirstreams[data->actdir] != NULL)
    {
      /* Oh, oh.  We must close this stream.  Get all remaining
         entries and store them as a list in the `content' member of
         the `struct dir_data' variable.  */
      size_t bufsize = 1024;
      char *buf = malloc (bufsize);

      if (buf == NULL)
        result = -1;
      else
        {
          DIR *st = data->dirstreams[data->actdir]->stream;
          struct dirent64 *d;
          size_t actsize = 0;

          while ((d = __readdir64 (st)) != NULL)
            {
              size_t this_len = NAMLEN (d);
              if (actsize + this_len + 2 >= bufsize)
                {
                  char *newp;
                  bufsize += MAX (1024, 2 * this_len);
                  newp = (char *) realloc (buf, bufsize);
                  if (newp == NULL)
                    {
                      /* No more memory.  */
                      int save_err = errno;
                      free (buf);
                      __set_errno (save_err);
                      return -1;
                    }
                  buf = newp;
                }

              *((char *) __mempcpy (buf + actsize, d->d_name, this_len))
                = '\0';
              actsize += this_len + 1;
            }

          /* Terminate the list with an additional NUL byte.  */
          buf[actsize++] = '\0';

          /* Shrink the buffer to what we actually need.  */
          data->dirstreams[data->actdir]->content = realloc (buf, actsize);
          if (data->dirstreams[data->actdir]->content == NULL)
            {
              int save_err = errno;
              free (buf);
              __set_errno (save_err);
              result = -1;
            }
          else
            {
              __closedir (st);
              data->dirstreams[data->actdir]->stream = NULL;
              data->dirstreams[data->actdir]->streamfd = -1;
              data->dirstreams[data->actdir] = NULL;
            }
        }
    }

  /* Open the new stream.  */
  if (result == 0)
    {
      assert (data->dirstreams[data->actdir] == NULL);

      if (dfdp != NULL && *dfdp != -1)
        {
          int fd = openat64_not_cancel_3 (*dfdp, data->dirbuf + data->ftw.base,
                                          O_RDONLY | O_DIRECTORY | O_NDELAY);
          dirp->stream = NULL;
          if (fd != -1 && (dirp->stream = __fdopendir (fd)) == NULL)
            close_not_cancel_no_status (fd);
        }
      else
        {
          const char *name;

          if (data->flags & FTW_CHDIR)
            {
              name = data->dirbuf + data->ftw.base;
              if (name[0] == '\0')
                name = ".";
            }
          else
            name = data->dirbuf;

          dirp->stream = __opendir (name);
        }

      if (dirp->stream == NULL)
        result = -1;
      else
        {
          dirp->streamfd = dirfd (dirp->stream);
          dirp->content = NULL;
          data->dirstreams[data->actdir] = dirp;

          if (++data->actdir == data->maxdir)
            data->actdir = 0;
        }
    }

  return result;
}


static int
internal_function
process_entry (struct ftw_data *data, struct dir_data *dir, const char *name,
               size_t namlen, int d_type)
{
  struct STAT st;
  int result = 0;
  int flag = 0;
  size_t new_buflen;

  if (name[0] == '.' && (name[1] == '\0'
                         || (name[1] == '.' && name[2] == '\0')))
    /* Don't process the "." and ".." entries.  */
    return 0;

  new_buflen = data->ftw.base + namlen + 2;
  if (data->dirbufsize < new_buflen)
    {
      /* Enlarge the buffer.  */
      char *newp;

      data->dirbufsize = 2 * new_buflen;
      newp = (char *) realloc (data->dirbuf, data->dirbufsize);
      if (newp == NULL)
        return -1;
      data->dirbuf = newp;
    }

  *((char *) __mempcpy (data->dirbuf + data->ftw.base, name, namlen)) = '\0';

  int statres;
  if (dir->streamfd != -1)
    statres = FXSTATAT (_STAT_VER, dir->streamfd, name, &st,
                        (data->flags & FTW_PHYS) ? AT_SYMLINK_NOFOLLOW : 0);
  else
    {
      if ((data->flags & FTW_CHDIR) == 0)
        name = data->dirbuf;

      statres = ((data->flags & FTW_PHYS)
                 ? LXSTAT (_STAT_VER, name, &st)
                 : XSTAT (_STAT_VER, name, &st));
    }

  if (statres < 0)
    {
      if (errno != EACCES && errno != ENOENT)
        result = -1;
      else if (data->flags & FTW_PHYS)
        flag = FTW_NS;
      else if (d_type == DT_LNK)
        flag = FTW_SLN;
      else
        {
          if (dir->streamfd != -1)
            statres = FXSTATAT (_STAT_VER, dir->streamfd, name, &st,
                                AT_SYMLINK_NOFOLLOW);
          else
            statres = LXSTAT (_STAT_VER, name, &st);
          if (statres == 0 && S_ISLNK (st.st_mode))
            flag = FTW_SLN;
          else
            flag = FTW_NS;
        }
    }
  else
    {
      if (S_ISDIR (st.st_mode))
        flag = FTW_D;
      else if (S_ISLNK (st.st_mode))
        flag = FTW_SL;
      else
        flag = FTW_F;
    }

  if (result == 0
      && (flag == FTW_NS
          || !(data->flags & FTW_MOUNT) || st.st_dev == data->dev))
    {
      if (flag == FTW_D)
        {
          if ((data->flags & FTW_PHYS)
              || (!find_object (data, &st)
                  /* Remember the object.  */
                  && (result = add_object (data, &st)) == 0))
            result = ftw_dir (data, &st, dir);
        }
      else
        result = (*data->func) (data->dirbuf, &st, data->cvt_arr[flag],
                                &data->ftw);
    }

  if ((data->flags & FTW_ACTIONRETVAL) && result == FTW_SKIP_SUBTREE)
    result = 0;

  return result;
}


static int
__attribute ((noinline))
internal_function
ftw_dir (struct ftw_data *data, struct STAT *st, struct dir_data *old_dir)
{
  struct dir_data dir;
  struct dirent64 *d;
  int previous_base = data->ftw.base;
  int result;
  char *startp;

  /* Open the stream for this directory.  This might require that
     another stream has to be closed.  */
  result = open_dir_stream (old_dir == NULL ? NULL : &old_dir->streamfd,
                            data, &dir);
  if (result != 0)
    {
      if (errno == EACCES)
        /* We cannot read the directory.  Signal this with a special flag.  */
        result = (*data->func) (data->dirbuf, st, FTW_DNR, &data->ftw);

      return result;
    }

  /* First, report the directory (if not depth-first).  */
  if (!(data->flags & FTW_DEPTH))
    {
      result = (*data->func) (data->dirbuf, st, FTW_D, &data->ftw);
      if (result != 0)
        {
          int save_err;
fail:
          save_err = errno;
          __closedir (dir.stream);
          dir.streamfd = -1;
          __set_errno (save_err);

          if (data->actdir-- == 0)
            data->actdir = data->maxdir - 1;
          data->dirstreams[data->actdir] = NULL;
          return result;
        }
    }

  /* If necessary, change to this directory.  */
  if (data->flags & FTW_CHDIR)
    {
      if (__fchdir (dirfd (dir.stream)) < 0)
        {
          result = -1;
          goto fail;
        }
    }

  /* Next, update the `struct FTW' information.  */
  ++data->ftw.level;
  startp = __rawmemchr (data->dirbuf, '\0');
  /* There always must be a directory name.  */
  assert (startp != data->dirbuf);
  if (startp[-1] != '/')
    *startp++ = '/';
  data->ftw.base = startp - data->dirbuf;

  while (dir.stream != NULL && (d = __readdir64 (dir.stream)) != NULL)
    {
      result = process_entry (data, &dir, d->d_name, NAMLEN (d), d->d_type);
      if (result != 0)
        break;
    }

  if (dir.stream != NULL)
    {
      /* The stream is still open.  I.e., we did not need more
         descriptors.  Simply close the stream now.  */
      int save_err = errno;

      assert (dir.content == NULL);

      __closedir (dir.stream);
      dir.streamfd = -1;
      __set_errno (save_err);

      if (data->actdir-- == 0)
        data->actdir = data->maxdir - 1;
      data->dirstreams[data->actdir] = NULL;
    }
  else
    {
      int save_err;
      char *runp = dir.content;

      while (result == 0 && *runp != '\0')
        {
          char *endp = strchr (runp, '\0');

          result = process_entry (data, &dir, runp, endp - runp, DT_UNKNOWN);

          runp = endp + 1;
        }

      save_err = errno;
      free (dir.content);
      __set_errno (save_err);
    }

  if ((data->flags & FTW_ACTIONRETVAL) && result == FTW_SKIP_SIBLINGS)
    result = 0;

  /* Prepare the return, revert the `struct FTW' information.  */
  data->dirbuf[data->ftw.base - 1] = '\0';
  --data->ftw.level;
  data->ftw.base = previous_base;

  /* Finally, if we process depth-first report the directory.  */
  if (result == 0 && (data->flags & FTW_DEPTH))
    result = (*data->func) (data->dirbuf, st, FTW_DP, &data->ftw);

  if (old_dir
      && (data->flags & FTW_CHDIR)
      && (result == 0
          || ((data->flags & FTW_ACTIONRETVAL)
              && (result != -1 && result != FTW_STOP))))
    {
      /* Change back to the parent directory.  */
      int done = 0;
      if (old_dir->stream != NULL)
        if (__fchdir (dirfd (old_dir->stream)) == 0)
          done = 1;

      if (!done)
        {
          if (data->ftw.base == 1)
            {
              if (__chdir ("/") < 0)
                result = -1;
            }
          else
            if (__chdir ("..") < 0)
              result = -1;
        }
    }

  return result;
}


static int
__attribute ((noinline))
internal_function
ftw_startup (const char *dir, int is_nftw, void *func, int descriptors,
             int flags)
{
  struct ftw_data data;
  struct STAT st;
  int result = 0;
  int save_err;
  int cwdfd = -1;
  char *cwd = NULL;
  char *cp;

  /* First make sure the parameters are reasonable.  */
  if (dir[0] == '\0')
    {
      __set_errno (ENOENT);
      return -1;
    }

  data.maxdir = descriptors < 1 ? 1 : descriptors;
  data.actdir = 0;
  data.dirstreams = (struct dir_data **) alloca (data.maxdir
                                                 * sizeof (struct dir_data *));
  memset (data.dirstreams, '\0', data.maxdir * sizeof (struct dir_data *));

  /* PATH_MAX is always defined when we get here.  */
  data.dirbufsize = MAX (2 * strlen (dir), PATH_MAX);
  data.dirbuf = (char *) malloc (data.dirbufsize);
  if (data.dirbuf == NULL)
    return -1;
  cp = __stpcpy (data.dirbuf, dir);
  /* Strip trailing slashes.  */
  while (cp > data.dirbuf + 1 && cp[-1] == '/')
    --cp;
  *cp = '\0';

  data.ftw.level = 0;

  /* Find basename.  */
  while (cp > data.dirbuf && cp[-1] != '/')
    --cp;
  data.ftw.base = cp - data.dirbuf;

  data.flags = flags;

  /* This assignment might seem to be strange but it is what we want.
     The trick is that the first three arguments to the `ftw' and
     `nftw' callback functions are equal.  Therefore we can call in
     every case the callback using the format of the `nftw' version
     and get the correct result since the stack layout for a function
     call in C allows this.  */
  data.func = (NFTW_FUNC_T) func;

  /* Since we internally use the complete set of FTW_* values we need
     to reduce the value range before calling a `ftw' callback.  */
  data.cvt_arr = is_nftw ? nftw_arr : ftw_arr;

  /* No object known so far.  */
  data.known_objects = NULL;

  /* Now go to the directory containing the initial file/directory.  */
  if (flags & FTW_CHDIR)
    {
      /* We have to be able to go back to the current working
         directory.  The best way to do this is to use a file
         descriptor.  */
      cwdfd = __open (".", O_RDONLY | O_DIRECTORY);
      if (cwdfd == -1)
        {
          /* Try getting the directory name.  This can be needed if
             the current directory is executable but not readable.  */
          if (errno == EACCES)
            /* GNU extension ahead.  */
            cwd =  __getcwd (NULL, 0);

          if (cwd == NULL)
            goto out_fail;
        }
      else if (data.maxdir > 1)
        /* Account for the file descriptor we use here.  */
        --data.maxdir;

      if (data.ftw.base > 0)
        {
          /* Change to the directory the file is in.  In data.dirbuf
             we have a writable copy of the file name.  Just NUL
             terminate it for now and change the directory.  */
          if (data.ftw.base == 1)
            /* I.e., the file is in the root directory.  */
            result = __chdir ("/");
          else
            {
              char ch = data.dirbuf[data.ftw.base - 1];
              data.dirbuf[data.ftw.base - 1] = '\0';
              result = __chdir (data.dirbuf);
              data.dirbuf[data.ftw.base - 1] = ch;
            }
        }
    }

  /* Get stat info for start directory.  */
  if (result == 0)
    {
      const char *name;

      if (data.flags & FTW_CHDIR)
        {
          name = data.dirbuf + data.ftw.base;
          if (name[0] == '\0')
            name = ".";
        }
      else
        name = data.dirbuf;

      if (((flags & FTW_PHYS)
           ? LXSTAT (_STAT_VER, name, &st)
           : XSTAT (_STAT_VER, name, &st)) < 0)
        {
          if (!(flags & FTW_PHYS)
              && errno == ENOENT
              && LXSTAT (_STAT_VER, name, &st) == 0
              && S_ISLNK (st.st_mode))
            result = (*data.func) (data.dirbuf, &st, data.cvt_arr[FTW_SLN],
                                   &data.ftw);
          else
            /* No need to call the callback since we cannot say anything
               about the object.  */
            result = -1;
        }
      else
        {
          if (S_ISDIR (st.st_mode))
            {
              /* Remember the device of the initial directory in case
                 FTW_MOUNT is given.  */
              data.dev = st.st_dev;

              /* We know this directory now.  */
              if (!(flags & FTW_PHYS))
                result = add_object (&data, &st);

              if (result == 0)
                result = ftw_dir (&data, &st, NULL);
            }
          else
            {
              int flag = S_ISLNK (st.st_mode) ? FTW_SL : FTW_F;

              result = (*data.func) (data.dirbuf, &st, data.cvt_arr[flag],
                                     &data.ftw);
            }
        }

      if ((flags & FTW_ACTIONRETVAL)
          && (result == FTW_SKIP_SUBTREE || result == FTW_SKIP_SIBLINGS))
        result = 0;
    }

  /* Return to the start directory (if necessary).  */
  if (cwdfd != -1)
    {
      int save_err = errno;
      if (__fchdir (cwdfd)) {};
      close_not_cancel_no_status (cwdfd);
      __set_errno (save_err);
    }
  else if (cwd != NULL)
    {
      int save_err = errno;
      if (__chdir (cwd)) {};
      free (cwd);
      __set_errno (save_err);
    }

  /* Free all memory.  */
 out_fail:
  save_err = errno;
  __tdestroy (data.known_objects, free);
  free (data.dirbuf);
  __set_errno (save_err);

  return result;
}



/* Entry points.  */

int
FTW_NAME (path, func, descriptors)
     const char *path;
     FTW_FUNC_T func;
     int descriptors;
{
  debug(FTW_NAME_STRING "(\"%s\", &func, %d)", path, descriptors);
  return ftw_startup (path, 0, func, descriptors, 0);
}

#if ((!defined(__FTW64_C) && HAVE_NFTW) || (defined(__FTW64_C) && HAVE_NFTW64))
#ifndef _LIBC
int
NFTW_NAME (path, func, descriptors, flags)
     const char *path;
     NFTW_FUNC_T func;
     int descriptors;
     int flags;
{
  debug(NFTW_NAME_STRING "(\"%s\", &func, %d, %d)", path, descriptors, flags);
  return ftw_startup (path, 1, func, descriptors, flags);
}
#else

# include <shlib-compat.h>

int NFTW_NEW_NAME (const char *, NFTW_FUNC_T, int, int);

int
NFTW_NEW_NAME (path, func, descriptors, flags)
     const char *path;
     NFTW_FUNC_T func;
     int descriptors;
     int flags;
{
  debug(NFTW_NEW_NAME_STRING "(\"%s\", &func, %d, %d)", path, descriptors, flags);
  if (flags
      & ~(FTW_PHYS | FTW_MOUNT | FTW_CHDIR | FTW_DEPTH | FTW_ACTIONRETVAL))
    {
      __set_errno (EINVAL);
      return -1;
    }
  return ftw_startup (path, 1, func, descriptors, flags);
}

versioned_symbol (libc, NFTW_NEW_NAME, NFTW_NAME, GLIBC_2_3_3);

# if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_3_3)

/* Older nftw* version just ignored all unknown flags.  */

int NFTW_OLD_NAME (const char *, NFTW_FUNC_T, int, int);

int
attribute_compat_text_section
NFTW_OLD_NAME (path, func, descriptors, flags)
     const char *path;
     NFTW_FUNC_T func;
     int descriptors;
     int flags;
{
  debug(NFTW_OLD_NAME_STRING "(\"%s\", &func, %d, %d)", path, descriptors, flags);
  flags &= (FTW_PHYS | FTW_MOUNT | FTW_CHDIR | FTW_DEPTH);
  return ftw_startup (path, 1, func, descriptors, flags);
}

compat_symbol (libc, NFTW_OLD_NAME, NFTW_NAME, GLIBC_2_1);
# endif
#endif
#endif

#else
typedef int empty_translation_unit;
#endif
