From 28f540f45bbacd939bfd07f213bcad2bf730b1bf Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@gnu.org>
Date: Sat, 18 Feb 1995 01:27:10 +0000
Subject: initial import

---
 sysdeps/unix/readdir.c | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 sysdeps/unix/readdir.c

(limited to 'sysdeps/unix/readdir.c')

diff --git a/sysdeps/unix/readdir.c b/sysdeps/unix/readdir.c
new file mode 100644
index 0000000..3ffa63e
--- /dev/null
+++ b/sysdeps/unix/readdir.c
@@ -0,0 +1,82 @@
+/* Copyright (C) 1991, 1992, 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 "direct.h"		/* This file defines `struct direct'.  */
+
+/* direct.h may have an alternate definition for this.  */
+#ifndef D_RECLEN
+#define D_RECLEN(dp)	((dp)->d_reclen)
+#endif
+
+
+/* Read a directory entry from DIRP.  */
+struct dirent *
+DEFUN(readdir, (dirp), DIR *dirp)
+{
+  if (dirp == NULL || dirp->__data == NULL)
+    {
+      errno = EINVAL;
+      return NULL;
+    }
+
+  while (1)
+    {
+      struct direct *dp;
+
+      if (dirp->__offset >= dirp->__size)
+	{
+	  /* We've emptied out our buffer.  Refill it.  */
+
+	  off_t base;
+	  ssize_t bytes = __getdirentries (dirp->__fd, dirp->__data,
+					   dirp->__allocation, &base);
+	  if (bytes <= 0)
+	    return NULL;
+	  dirp->__size = (size_t) bytes;
+
+	  /* Reset the offset into the buffer.  */
+	  dirp->__offset = 0;
+	}
+
+      dp = (struct direct *) &dirp->__data[dirp->__offset];
+      dirp->__offset += D_RECLEN (dp);
+
+      if (dp->d_ino != 0)
+	{
+	  /* Not a deleted file.  */
+	  register struct dirent *d = &dirp->__entry;
+	  register const char *p;
+	  d->d_fileno = (ino_t) dp->d_ino;
+	  /* On some systems the name length does not actually mean much.
+	     But we always use it as a maximum.  */
+	  p = memchr ((PTR) dp->d_name, '\0', D_NAMLEN (dp) + 1);
+	  d->d_namlen = (p != NULL) ? p - dp->d_name : D_NAMLEN (dp);
+	  memcpy (d->d_name, dp->d_name, d->d_namlen + 1);
+	  return d;
+	}
+    }
+}
-- 
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