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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /sysdeps/mach/hurd/readdir.c
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initial import
Diffstat (limited to 'sysdeps/mach/hurd/readdir.c')
-rw-r--r--sysdeps/mach/hurd/readdir.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/readdir.c b/sysdeps/mach/hurd/readdir.c
new file mode 100644
index 0000000000..185aeee2b1
--- /dev/null
+++ b/sysdeps/mach/hurd/readdir.c
@@ -0,0 +1,90 @@
+/* Copyright (C) 1993, 1994 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C 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.
+
+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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <ansidecl.h>
+#include <errno.h>
+#include <limits.h>
+#include <stddef.h>
+#include <string.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <hurd.h>
+
+
+/* Read a directory entry from DIRP. */
+struct dirent *
+DEFUN(readdir, (dirp), DIR *dirp)
+{
+ struct dirent *dp;
+
+ if (dirp == NULL)
+ {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ do
+ {
+ if (dirp->__ptr - dirp->__data >= dirp->__size)
+ {
+ /* We've emptied out our buffer. Refill it. */
+
+ char *data = dirp->__data;
+ int nentries;
+ error_t err;
+
+ if (err = __dir_readdir (dirp->__port, &data, &dirp->__size,
+ dirp->__entry_ptr, -1, 0, &nentries))
+ return __hurd_fail (err), NULL;
+
+ /* DATA now corresponds to entry index DIRP->__entry_ptr. */
+ dirp->__entry_data = dirp->__entry_ptr;
+
+ if (data != dirp->__data)
+ {
+ /* The data was passed out of line, so our old buffer is no
+ longer useful. Deallocate the old buffer and reset our
+ information for the new buffer. */
+ __vm_deallocate (__mach_task_self (),
+ (vm_address_t) dirp->__data,
+ dirp->__allocation);
+ dirp->__data = data;
+ dirp->__allocation = round_page (dirp->__size);
+ }
+
+ /* Reset the pointer into the buffer. */
+ dirp->__ptr = dirp->__data;
+
+ if (nentries == 0)
+ /* End of file. */
+ return NULL;
+
+ /* We trust the filesystem to return correct data and so we
+ ignore NENTRIES. */
+ }
+
+ dp = (struct dirent *) dirp->__ptr;
+ dirp->__ptr += dp->d_reclen;
+ ++dirp->__entry_ptr;
+
+ /* Loop to ignore deleted files. */
+ } while (dp->d_fileno == 0);
+
+ return dp;
+}