Sync ftw w/ glibc, splitting ftw and ftw64

1 files changed, 596 insertions, 435 deletions

diff --git a/libc/misc/ftw/ftw.c b/libc/misc/ftw/ftw.c
index 8a6db98d3..fdea1c208 100644
--- a/libc/misc/ftw/ftw.c
+++ b/libc/misc/ftw/ftw.c
@@ -1,5 +1,5 @@
 /* File tree walker functions.
-   Copyright (C) 1996-2001, 2002, 2003 Free Software Foundation, Inc.
+   Copyright (C) 1996-2003, 2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
 
@@ -18,67 +18,68 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-/* used by D_EXACT_NAMLEN */
-#define strlen __strlen
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
 
-#define mempcpy __mempcpy
-#define stpcpy __stpcpy
+#define _GNU_SOURCE
+#define _XOPEN_SOURCE 500
+#include <features.h>
+#ifdef __UCLIBC__
+#undef _LIBC
+#define HAVE_DIRENT_H 1
+#define HAVE_SYS_PARAM_H 1
+#define HAVE_DECL_STPCPY 1
+#define HAVE_MEMPCPY 1
+#define dirfd __dirfd
 #define tsearch __tsearch
-#define tdestroy __tdestroy
 #define tfind __tfind
-#define fchdir __fchdir
-#define chdir __chdir
-#define dirfd __dirfd
+#define tdestroy __tdestroy
 #define getcwd __getcwd
+#define chdir __chdir
+#define fchdir __fchdir
+#define mempcpy __mempcpy
 #define opendir __opendir
 #define closedir __closedir
-
-#define _GNU_SOURCE
-#include <features.h>
-
-#if defined (__UCLIBC_HAS_LFS__) && defined L_ftw64
-#ifndef L_ftw
-#define L_ftw
+#define stpcpy __stpcpy
 #endif
 
-/* If Large file support is enabled, transparently remap
- * things to use the 64-bit interfaces */
-#if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS != 64 
-#undef _FILE_OFFSET_BITS
-#define	_FILE_OFFSET_BITS   64
-#endif
-#ifndef __USE_LARGEFILE64
-# define __USE_LARGEFILE64  1
-#endif
-#ifndef __USE_FILE_OFFSET64
-# define __USE_FILE_OFFSET64  1
+#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
 
-#define FTW_NAME ftw64
-#define NFTW_NAME nftw64
-#define INO_T ino64_t
-#define STAT stat64
-#define LSTAT __lstat64
-#define XSTAT __stat64
-#define FTW_FUNC_T __ftw64_func_t
-#define NFTW_FUNC_T __nftw64_func_t
-#define __readdir __readdir64
+#if defined _LIBC
+# include <dirent.h>
+# define NAMLEN(dirent) _D_EXACT_NAMLEN (dirent)
 #else
-#undef __stat
-#undef __lstat
-#define FTW_NAME ftw
-#define NFTW_NAME nftw
-#define INO_T ino_t
-#define STAT stat
-#define LSTAT __lstat
-#define XSTAT __stat
-#define FTW_FUNC_T __ftw_func_t
-#define NFTW_FUNC_T __nftw_func_t
+# 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
 
-#ifdef L_ftw
-
-#include <alloca.h>
 #include <errno.h>
 #include <ftw.h>
 #include <limits.h>
@@ -86,14 +87,100 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
-#include <sys/param.h>
-#include <sys/stat.h>
+#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
+
+#if ! _LIBC && !HAVE_DECL_STPCPY && !defined stpcpy
+char *stpcpy ();
+#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>
-#include <dirent.h>
 
-#if 1 /*ndef L_ftw64*/
+#if !defined _LIBC && !defined __UCLIBC__
+# undef __chdir
+# define __chdir chdir
+# undef __closedir
+# define __closedir closedir
+# undef __fchdir
+# define __fchdir fchdir
+# ifndef __UCLIBC__
+# undef __getcwd
+# define __getcwd(P, N) xgetcwd ()
+extern char *xgetcwd (void);
+# endif
+# undef __mempcpy
+# define __mempcpy mempcpy
+# undef __opendir
+# define __opendir opendir
+# 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 && !defined __UCLIBC__
+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
+# else
+#  ifdef __UCLIBC__
+#    define LXSTAT(V,f,sb) __lstat(f,sb)
+#    define XSTAT(V,f,sb) __stat(f,sb)
+#    define __readdir64 __readdir
+#    define dirent64 dirent
+#  else
+#  define LXSTAT(V,f,sb) lstat (f,sb)
+#  define XSTAT(V,f,sb) stat (f,sb)
+#  endif
+# endif
+# define FTW_FUNC_T __ftw_func_t
+# define NFTW_FUNC_T __nftw_func_t
 extern struct dirent *__readdir (DIR *__dirp) __nonnull ((1)) attribute_hidden;
-#else
+# else
 extern struct dirent64 *__readdir64 (DIR *__dirp) __nonnull ((1)) attribute_hidden;
 #endif
 
@@ -107,48 +194,48 @@ extern struct dirent64 *__readdir64 (DIR *__dirp) __nonnull ((1)) attribute_hidd
 
 struct dir_data
 {
-    DIR *stream;
-    char *content;
+  DIR *stream;
+  char *content;
 };
 
 struct known_object
 {
-    dev_t dev;
-    INO_T ino;
+  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;
+  /* 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;
+  /* 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;
+  /* 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;
+  /* 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;
+  /* 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;
+  /* Callback function.  We always use the `nftw' form.  */
+  NFTW_FUNC_T func;
 
-    /* Device of starting point.  Needed for FTW_MOUNT.  */
-    dev_t dev;
+  /* 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;
+  /* Data structure for keeping fingerprints of already processed
+     object.  This is needed when not using FTW_PHYS.  */
+  void *known_objects;
 };
 
 
@@ -156,52 +243,54 @@ struct ftw_data
    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
+  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
+  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) internal_function;
+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);
+  /* 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 inline 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;
+  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;
+  struct known_object obj;
+  obj.dev = st->st_dev;
+  obj.ino = st->st_ino;
+  return __tfind (&obj, &data->known_objects, object_compare) != NULL;
 }
 
 
@@ -209,465 +298,537 @@ static inline int
 __attribute ((always_inline))
 open_dir_stream (struct ftw_data *data, struct dir_data *dirp)
 {
-    int result = 0;
+  int result = 0;
 
-    if (data->dirstreams[data->actdir] != NULL)
+  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
+      /* 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 dirent *d;
-	    size_t actsize = 0;
+	  DIR *st = data->dirstreams[data->actdir]->stream;
+	  struct dirent64 *d;
+	  size_t actsize = 0;
 
-	    while ((d = __readdir (st)) != NULL)
+	  while ((d = __readdir64 (st)) != NULL)
 	    {
-		size_t this_len = _D_EXACT_NAMLEN (d);
-		if (actsize + this_len + 2 >= bufsize)
+	      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)
+		  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);
-			result = -1;
-			break;
+		      /* No more memory.  */
+		      int save_err = errno;
+		      free (buf);
+		      __set_errno (save_err);
+		      result = -1;
+		      break;
 		    }
-		    buf = newp;
+		  buf = newp;
 		}
 
-		*((char *) mempcpy (buf + actsize, d->d_name, this_len))
-		    = '\0';
-		actsize += this_len + 1;
+	      *((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';
+	  /* 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)
+	  /* 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;
+	      int save_err = errno;
+	      free (buf);
+	      __set_errno (save_err);
+	      result = -1;
 	    }
-	    else
+	  else
 	    {
-		closedir (st);
-		data->dirstreams[data->actdir]->stream = NULL;
-		data->dirstreams[data->actdir] = NULL;
+	      __closedir (st);
+	      data->dirstreams[data->actdir]->stream = NULL;
+	      data->dirstreams[data->actdir] = NULL;
 	    }
 	}
     }
 
-    /* Open the new stream.  */
-    if (result == 0)
+  /* Open the new stream.  */
+  if (result == 0)
     {
-	const char *name = ((data->flags & FTW_CHDIR)
-		? data->dirbuf + data->ftw.base: data->dirbuf);
-	assert (data->dirstreams[data->actdir] == NULL);
-
-	dirp->stream = opendir (name);
-	if (dirp->stream == NULL)
-	    result = -1;
-	else
+      const char *name = ((data->flags & FTW_CHDIR)
+			  ? data->dirbuf + data->ftw.base: data->dirbuf);
+      assert (data->dirstreams[data->actdir] == NULL);
+
+      dirp->stream = __opendir (name);
+      if (dirp->stream == NULL)
+	result = -1;
+      else
 	{
-	    dirp->content = NULL;
-	    data->dirstreams[data->actdir] = dirp;
+	  dirp->content = NULL;
+	  data->dirstreams[data->actdir] = dirp;
 
-	    if (++data->actdir == data->maxdir)
-		data->actdir = 0;
+	  if (++data->actdir == data->maxdir)
+	    data->actdir = 0;
 	}
     }
 
-    return result;
+  return result;
 }
 
 
 static int
 internal_function
-process_entry (struct ftw_data *data, struct dir_data *dir, const char *name, size_t namlen)
+process_entry (struct ftw_data *data, struct dir_data *dir, const char *name,
+	       size_t namlen)
 {
-    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)
+  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;
+      /* 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';
+  *((char *) __mempcpy (data->dirbuf + data->ftw.base, name, namlen)) = '\0';
 
-    if ((data->flags & FTW_CHDIR) == 0)
-	name = data->dirbuf;
+  if ((data->flags & FTW_CHDIR) == 0)
+    name = data->dirbuf;
 
-    if (((data->flags & FTW_PHYS)
-		? LSTAT (name, &st)
-		: XSTAT (name, &st)) < 0)
+  if (((data->flags & FTW_PHYS)
+       ? LXSTAT (_STAT_VER, name, &st)
+       : XSTAT (_STAT_VER, name, &st)) < 0)
     {
-	if (errno != EACCES && errno != ENOENT)
-	    result = -1;
-	else if (!(data->flags & FTW_PHYS)
-		&& LSTAT (name, &st) == 0
-		&& S_ISLNK (st.st_mode))
-	    flag = FTW_SLN;
-	else
-	    flag = FTW_NS;
+      if (errno != EACCES && errno != ENOENT)
+	result = -1;
+      else if (!(data->flags & FTW_PHYS)
+	       && LXSTAT (_STAT_VER, name, &st) == 0
+	       && S_ISLNK (st.st_mode))
+	flag = FTW_SLN;
+      else
+	flag = FTW_NS;
     }
-    else
+  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 (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 (result == 0
+      && (flag == FTW_NS
+	  || !(data->flags & FTW_MOUNT) || st.st_dev == data->dev))
     {
-	if (flag == FTW_D)
+      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);
-
-		if (result == 0 && (data->flags & FTW_CHDIR))
-		{
-		    /* Change back to the parent directory.  */
-		    int done = 0;
-		    if (dir->stream != NULL)
-			if (fchdir (dirfd (dir->stream)) == 0)
-			    done = 1;
-
-		    if (!done)
-		    {
-			if (data->ftw.base == 1)
-			{
-			    if (chdir ("/") < 0)
-				result = -1;
-			}
-			else
-			    if (chdir ("..") < 0)
-				result = -1;
-		    }
-		}
-	    }
+	  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);
+      else
+	result = (*data->func) (data->dirbuf, &st, data->cvt_arr[flag],
+				&data->ftw);
     }
 
-    return result;
+  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)
+ftw_dir (struct ftw_data *data, struct STAT *st, struct dir_data *old_dir)
 {
-    struct dir_data dir;
-    struct dirent *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 (data, &dir);
-    if (result != 0)
+  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 (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);
+      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;
+      return result;
     }
 
-    /* First, report the directory (if not depth-first).  */
-    if (!(data->flags & FTW_DEPTH))
+  /* 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)
-	    return result;
+      result = (*data->func) (data->dirbuf, st, FTW_D, &data->ftw);
+      if (result != 0)
+	{
+	  int save_err;
+fail:
+	  save_err = errno;
+	  __closedir (dir.stream);
+	  __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 necessary, change to this directory.  */
+  if (data->flags & FTW_CHDIR)
     {
-	if (fchdir (dirfd (dir.stream)) < 0)
+      if (__fchdir (dirfd (dir.stream)) < 0)
 	{
-	    int save_err = errno;
-	    closedir (dir.stream);
-	    __set_errno (save_err);
-
-	    if (data->actdir-- == 0)
-		data->actdir = data->maxdir - 1;
-	    data->dirstreams[data->actdir] = NULL;
-
-	    return -1;
+	  result = -1;
+	  goto fail;
 	}
     }
 
-    /* Next, update the `struct FTW' information.  */
-    ++data->ftw.level;
-    startp = __strchr (data->dirbuf, '\0');
-    /* There always must be a directory name.  */
-    assert (startp != data->dirbuf);
-    if (startp[-1] != '/')
-	*startp++ = '/';
-    data->ftw.base = startp - data->dirbuf;
+  /* Next, update the `struct FTW' information.  */
+  ++data->ftw.level;
+  startp = __strchr (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 = __readdir (dir.stream)) != NULL)
+  while (dir.stream != NULL && (d = __readdir64 (dir.stream)) != NULL)
     {
-	result = process_entry (data, &dir, d->d_name, _D_EXACT_NAMLEN (d));
-	if (result != 0)
-	    break;
+      result = process_entry (data, &dir, d->d_name, NAMLEN (d));
+      if (result != 0)
+	break;
     }
 
-    if (dir.stream != NULL)
+  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;
+      /* 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);
+      assert (dir.content == NULL);
 
-	closedir (dir.stream);
-	__set_errno (save_err);
+      __closedir (dir.stream);
+      __set_errno (save_err);
 
-	if (data->actdir-- == 0)
-	    data->actdir = data->maxdir - 1;
-	data->dirstreams[data->actdir] = NULL;
+      if (data->actdir-- == 0)
+	data->actdir = data->maxdir - 1;
+      data->dirstreams[data->actdir] = NULL;
     }
-    else
+  else
     {
-	int save_err;
-	char *runp = dir.content;
+      int save_err;
+      char *runp = dir.content;
 
-	while (result == 0 && *runp != '\0')
+      while (result == 0 && *runp != '\0')
 	{
-	    char *endp = __strchr (runp, '\0');
+	  char *endp = __strchr (runp, '\0');
 
-	    result = process_entry (data, &dir, runp, endp - runp);
+	  result = process_entry (data, &dir, runp, endp - runp);
 
-	    runp = endp + 1;
+	  runp = endp + 1;
 	}
 
-	save_err = errno;
-	free (dir.content);
-	__set_errno (save_err);
+      save_err = errno;
+      free (dir.content);
+      __set_errno (save_err);
     }
 
-    /* Prepare the return, revert the `struct FTW' information.  */
-    data->dirbuf[data->ftw.base - 1] = '\0';
-    --data->ftw.level;
-    data->ftw.base = previous_base;
+  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);
+  /* 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;
 
-    return result;
+      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)
+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;
-    char *cwd = NULL;
-    char *cp;
-
-    /* First make sure the parameters are reasonable.  */
-    if (unlikely(dir==NULL || *dir=='\0')) {
-	__set_errno (ENOENT);
-	return -1;
-    }
-    if ((__strlen(dir)+1) > NAME_MAX) {
-	__set_errno(ENAMETOOLONG);
-	return -1;
+  struct ftw_data data;
+  struct STAT st;
+  int result = 0;
+  int save_err;
+  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)
+  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)
     {
-	/* GNU extension ahead.  */
-	cwd =  getcwd (NULL, 0);
-	if (cwd == NULL)
-	    result = -1;
-	else if (data.ftw.base > 0)
+      /* GNU extension ahead.  */
+      cwd =  __getcwd (NULL, 0);
+      if (cwd == NULL)
+	result = -1;
+      else 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
+	  /* 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;
+	      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)
+  /* Get stat info for start directory.  */
+  if (result == 0)
     {
-	const char *name = ((data.flags & FTW_CHDIR)
-		? data.dirbuf + data.ftw.base
-		: data.dirbuf);
+      const char *name = ((data.flags & FTW_CHDIR)
+			  ? data.dirbuf + data.ftw.base
+			  : data.dirbuf);
 
-	if (((flags & FTW_PHYS)
-		    ? LSTAT (name, &st)
-		    : XSTAT (name, &st)) < 0)
+      if (((flags & FTW_PHYS)
+	   ? LXSTAT (_STAT_VER, name, &st)
+	   : XSTAT (_STAT_VER, name, &st)) < 0)
 	{
-	    if (!(flags & FTW_PHYS)
-		    && errno == ENOENT
-		    && LSTAT (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;
+	  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
+      else
 	{
-	    if (S_ISDIR (st.st_mode))
+	  if (S_ISDIR (st.st_mode))
 	    {
-		/* Remember the device of the initial directory in case
-		   FTW_MOUNT is given.  */
-		data.dev = st.st_dev;
+	      /* 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);
+	      /* We know this directory now.  */
+	      if (!(flags & FTW_PHYS))
+		result = add_object (&data, &st);
 
-		if (result == 0)
-		    result = ftw_dir (&data, &st);
+	      if (result == 0)
+		result = ftw_dir (&data, &st, NULL);
 	    }
-	    else
+	  else
 	    {
-		int flag = S_ISLNK (st.st_mode) ? FTW_SL : FTW_F;
+	      int flag = S_ISLNK (st.st_mode) ? FTW_SL : FTW_F;
 
-		result = (*data.func) (data.dirbuf, &st, data.cvt_arr[flag],
-			&data.ftw);
+	      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 (cwd != NULL)
+  /* Return to the start directory (if necessary).  */
+  if (cwd != NULL)
     {
-	int save_err = errno;
-	chdir (cwd);
-	free (cwd);
-	__set_errno (save_err);
+      int save_err = errno;
+      __chdir (cwd);
+      free (cwd);
+      __set_errno (save_err);
     }
 
-    /* Free all memory.  */
-    save_err = errno;
-    tdestroy (data.known_objects, free);
-    free (data.dirbuf);
-    __set_errno (save_err);
+  /* Free all memory.  */
+  save_err = errno;
+  __tdestroy (data.known_objects, free);
+  free (data.dirbuf);
+  __set_errno (save_err);
 
-    return result;
+  return result;
 }
 
 
 
 /* Entry points.  */
 
-int FTW_NAME (const char *path, FTW_FUNC_T func, int descriptors)
+int
+FTW_NAME (path, func, descriptors)
+     const char *path;
+     FTW_FUNC_T func;
+     int descriptors;
 {
-    return ftw_startup (path, 0, func, descriptors, 0);
+  return ftw_startup (path, 0, func, descriptors, 0);
 }
 
-int NFTW_NAME (const char *path, NFTW_FUNC_T func, int descriptors, int flags)
+#ifndef _LIBC
+int
+NFTW_NAME (path, func, descriptors, flags)
+     const char *path;
+     NFTW_FUNC_T func;
+     int descriptors;
+     int flags;
 {
-    return ftw_startup (path, 1, func, 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;
+{
+  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;
+{
+  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