1 files changed, 106 insertions, 0 deletions
diff --git a/lib/libc/gen/opendir.c b/lib/libc/gen/opendir.c
new file mode 100644
index 0000000..a3db45b
--- /dev/null
+++ b/lib/libc/gen/opendir.c
@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 1983, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)opendir.c	8.2 (Berkeley) 2/12/94";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/param.h>
+#include <sys/stat.h>
+
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+/*
+ * open a directory.
+ */
+DIR *
+opendir(name)
+	const char *name;
+{
+	register DIR *dirp;
+	register int fd;
+	int saved_errno;
+	struct stat sb;
+
+	/*
+	 * stat() before open() because opening of special files may be
+	 * harmful.  fstat() after open because the file may have changed.
+	 */
+	if (stat(name, &sb) != 0)
+		return NULL;
+	if (!S_ISDIR(sb.st_mode)) {
+		errno = ENOTDIR;
+		return NULL;
+	}
+	if ((fd = open(name, O_RDONLY | O_NONBLOCK)) == -1)
+		return NULL;
+	dirp = NULL;
+	if (fstat(fd, &sb) != 0)
+		goto fail;
+	if (!S_ISDIR(sb.st_mode)) {
+		errno = ENOTDIR;
+		goto fail;
+	}
+	if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1 ||
+	    (dirp = malloc(sizeof(DIR))) == NULL)
+		goto fail;
+	/*
+	 * Use the system page size if that is a multiple of DIRBLKSIZ
+	 * this could speed things up in some cases we hope
+	 */
+	dirp->dd_len = getpagesize();
+	if ((dirp->dd_len % DIRBLKSIZ) != 0) 
+		dirp->dd_len = DIRBLKSIZ;
+	dirp->dd_buf = malloc(dirp->dd_len);
+	if (dirp->dd_buf == NULL)
+		goto fail;
+	dirp->dd_fd = fd;
+	dirp->dd_loc = 0;
+	dirp->dd_seek = 0;
+	/*
+	 * Set up seek point for rewinddir.
+	 */
+	dirp->dd_rewind = telldir(dirp);
+	return dirp;
+
+fail:
+	saved_errno = errno;
+	free(dirp);
+	close(fd);
+	errno = saved_errno;
+	return NULL;
+}