summaryrefslogtreecommitdiff
path: root/sysdeps/unix/readdir_r.c
diff options
context:
space:
mode:
Diffstat (limited to 'sysdeps/unix/readdir_r.c')
-rw-r--r--sysdeps/unix/readdir_r.c108
1 files changed, 108 insertions, 0 deletions
diff --git a/sysdeps/unix/readdir_r.c b/sysdeps/unix/readdir_r.c
new file mode 100644
index 0000000000..ef75c36234
--- /dev/null
+++ b/sysdeps/unix/readdir_r.c
@@ -0,0 +1,108 @@
+/* Copyright (C) 1991, 92, 93, 94, 95, 96 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 <errno.h>
+#include <limits.h>
+#include <stddef.h>
+#include <string.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <assert.h>
+
+#include <dirstream.h>
+
+
+/* Read a directory entry from DIRP. */
+int
+__readdir_r (DIR *dirp, struct dirent *entry, struct dirent **result)
+{
+ struct dirent *dp;
+
+ __libc_lock_lock (dirp->lock);
+
+ do
+ {
+ size_t reclen;
+
+ if (dirp->offset >= dirp->size)
+ {
+ /* We've emptied out our buffer. Refill it. */
+
+ size_t maxread;
+ off_t base;
+ ssize_t bytes;
+
+#ifndef _DIRENT_HAVE_D_RECLEN
+ /* Fixed-size struct; must read one at a time (see below). */
+ maxread = sizeof *dp;
+#else
+ maxread = dirp->allocation;
+#endif
+
+ base = dirp->filepos;
+ bytes = __getdirentries (dirp->fd, dirp->data, maxread, &base);
+ if (bytes <= 0)
+ {
+ dp = NULL;
+ break;
+ }
+ dirp->size = (size_t) bytes;
+
+ /* Reset the offset into the buffer. */
+ dirp->offset = 0;
+ }
+
+ dp = (struct dirent *) &dirp->data[dirp->offset];
+
+#ifdef _DIRENT_HAVE_D_RECLEN
+ reclen = dp->d_reclen;
+#else
+ /* The only version of `struct dirent' that lacks `d_reclen'
+ is fixed-size. */
+ assert (sizeof dp->d_name > 1);
+ reclen = sizeof *dp;
+ /* The name is not terminated if it is the largest possible size.
+ Clobber the following byte to ensure proper null termination. We
+ read just one entry at a time above so we know that byte will not
+ be used later. */
+ dp->d_name[sizeof dp->d_name] = '\0';
+#endif
+
+ dirp->offset += reclen;
+
+#ifdef _DIRENT_HAVE_D_OFF
+ dirp->filepos = dp->d_off;
+#else
+ dirp->filepos += reclen;
+#endif
+
+ /* Skip deleted files. */
+ } while (dp->d_ino == 0);
+
+ if (dp != NULL)
+ {
+ *entry = *dp;
+ *result = entry;
+ }
+
+ __libc_lock_unlock (dirp->lock);
+
+ return dp != NULL ? 0 : -1;
+}
+weak_alias (__readdir_r, readdir_r)