Imported Upstream version 1.23

[tar] / lib / fchdir.c

diff --git a/lib/fchdir.c b/lib/fchdir.c
deleted file mode 100644 (file)
index 969e984..0000000
--- a/lib/fchdir.c
+++ /dev/null
@@ -1,238 +0,0 @@
-/* fchdir replacement.
-   Copyright (C) 2006-2008 Free Software Foundation, Inc.
-
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
-
-   This program 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 General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-#include <config.h>
-
-/* Specification.  */
-#include <unistd.h>
-
-#include <dirent.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <stdarg.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-
-#include "canonicalize.h"
-
-/* This replacement assumes that a directory is not renamed while opened
-   through a file descriptor.  */
-
-/* Array of file descriptors opened.  If it points to a directory, it stores
-   info about this directory; otherwise it stores an errno value of ENOTDIR.  */
-typedef struct
-{
-  char *name;       /* Absolute name of the directory, or NULL.  */
-  int saved_errno;  /* If name == NULL: The error code describing the failure
-                      reason.  */
-} dir_info_t;
-static dir_info_t *dirs;
-static size_t dirs_allocated;
-
-/* Try to ensure dirs has enough room for a slot at index fd.  */
-static void
-ensure_dirs_slot (size_t fd)
-{
-  if (fd >= dirs_allocated)
-    {
-      size_t new_allocated;
-      dir_info_t *new_dirs;
-      size_t i;
-
-      new_allocated = 2 * dirs_allocated + 1;
-      if (new_allocated <= fd)
-       new_allocated = fd + 1;
-      new_dirs =
-       (dirs != NULL
-        ? (dir_info_t *) realloc (dirs, new_allocated * sizeof (dir_info_t))
-        : (dir_info_t *) malloc (new_allocated * sizeof (dir_info_t)));
-      if (new_dirs != NULL)
-       {
-         for (i = dirs_allocated; i < new_allocated; i++)
-           {
-             new_dirs[i].name = NULL;
-             new_dirs[i].saved_errno = ENOTDIR;
-           }
-         dirs = new_dirs;
-         dirs_allocated = new_allocated;
-       }
-    }
-}
-
-/* Hook into the gnulib replacements for open() and close() to keep track
-   of the open file descriptors.  */
-
-void
-_gl_unregister_fd (int fd)
-{
-  if (fd >= 0 && fd < dirs_allocated)
-    {
-      if (dirs[fd].name != NULL)
-       free (dirs[fd].name);
-      dirs[fd].name = NULL;
-      dirs[fd].saved_errno = ENOTDIR;
-    }
-}
-
-void
-_gl_register_fd (int fd, const char *filename)
-{
-  struct stat statbuf;
-
-  ensure_dirs_slot (fd);
-  if (fd < dirs_allocated
-      && fstat (fd, &statbuf) >= 0 && S_ISDIR (statbuf.st_mode))
-    {
-      dirs[fd].name = canonicalize_file_name (filename);
-      if (dirs[fd].name == NULL)
-       dirs[fd].saved_errno = errno;
-    }
-}
-
-/* Override opendir() and closedir(), to keep track of the open file
-   descriptors.  Needed because there is a function dirfd().  */
-
-int
-rpl_closedir (DIR *dp)
-#undef closedir
-{
-  int fd = dirfd (dp);
-  int retval = closedir (dp);
-
-  if (retval >= 0)
-    _gl_unregister_fd (fd);
-  return retval;
-}
-
-DIR *
-rpl_opendir (const char *filename)
-#undef opendir
-{
-  DIR *dp;
-
-  dp = opendir (filename);
-  if (dp != NULL)
-    {
-      int fd = dirfd (dp);
-      if (fd >= 0)
-       _gl_register_fd (fd, filename);
-    }
-  return dp;
-}
-
-/* Override dup() and dup2(), to keep track of open file descriptors.  */
-
-int
-rpl_dup (int oldfd)
-#undef dup
-{
-  int newfd = dup (oldfd);
-
-  if (oldfd >= 0 && newfd >= 0)
-    {
-      ensure_dirs_slot (newfd);
-      if (newfd < dirs_allocated)
-       {
-         if (oldfd < dirs_allocated)
-           {
-             if (dirs[oldfd].name != NULL)
-               {
-                 dirs[newfd].name = strdup (dirs[oldfd].name);
-                 if (dirs[newfd].name == NULL)
-                   dirs[newfd].saved_errno = ENOMEM;
-               }
-             else
-               {
-                 dirs[newfd].name = NULL;
-                 dirs[newfd].saved_errno = dirs[oldfd].saved_errno;
-               }
-           }
-         else
-           {
-             dirs[newfd].name = NULL;
-             dirs[newfd].saved_errno = ENOMEM;
-           }
-       }
-    }
-  return newfd;
-}
-
-int
-rpl_dup2 (int oldfd, int newfd)
-#undef dup2
-{
-  int retval = dup2 (oldfd, newfd);
-
-  if (retval >= 0 && oldfd >= 0 && newfd >= 0 && newfd != oldfd)
-    {
-      ensure_dirs_slot (newfd);
-      if (newfd < dirs_allocated)
-       {
-         if (oldfd < dirs_allocated)
-           {
-             if (dirs[oldfd].name != NULL)
-               {
-                 dirs[newfd].name = strdup (dirs[oldfd].name);
-                 if (dirs[newfd].name == NULL)
-                   dirs[newfd].saved_errno = ENOMEM;
-               }
-             else
-               {
-                 dirs[newfd].name = NULL;
-                 dirs[newfd].saved_errno = dirs[oldfd].saved_errno;
-               }
-           }
-         else
-           {
-             dirs[newfd].name = NULL;
-             dirs[newfd].saved_errno = ENOMEM;
-           }
-       }
-    }
-  return retval;
-}
-
-/* Implement fchdir() in terms of chdir().  */
-
-int
-fchdir (int fd)
-{
-  if (fd >= 0)
-    {
-      if (fd < dirs_allocated)
-       {
-         if (dirs[fd].name != NULL)
-           return chdir (dirs[fd].name);
-         else
-           {
-             errno = dirs[fd].saved_errno;
-             return -1;
-           }
-       }
-      else
-       {
-         errno = ENOMEM;
-         return -1;
-       }
-    }
-  else
-    {
-      errno = EBADF;
-      return -1;
-    }
-}