1 files changed, 115 insertions, 0 deletions
diff --git a/StdLib/LibC/Stdio/flags.c b/StdLib/LibC/Stdio/flags.c
new file mode 100644
index 0000000000..59ce8e30d6
--- /dev/null
+++ b/StdLib/LibC/Stdio/flags.c
@@ -0,0 +1,115 @@
+/** @file
+    Implementation of internal function to return the (stdio) flags for a given mode.
+
+    Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>
+    This program and the accompanying materials are licensed and made available
+    under the terms and conditions of the BSD License that accompanies this
+    distribution.  The full text of the license may be found at
+    http://opensource.org/licenses/bsd-license.php.
+
+    THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+    WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+    Copyright (c) 1990, 1993
+    The Regents of the University of California.  All rights reserved.
+
+    This code is derived from software contributed to Berkeley by
+    Chris Torek.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+      - Redistributions of source code must retain the above copyright
+        notice, this list of conditions and the following disclaimer.
+      - 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.
+      - 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDERS 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.
+
+    NetBSD: flags.c,v 1.14 2003/08/07 16:43:23 agc Exp
+    flags.c 8.1 (Berkeley) 6/4/93
+**/
+#include  <LibConfig.h>
+#include <sys/EfiCdefs.h>
+
+#include <sys/types.h>
+#include <assert.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <errno.h>
+#include "reentrant.h"
+#include "local.h"
+
+/*
+ * Return the (stdio) flags for a given mode.  Store the flags
+ * to be passed to an open() syscall through *optr.
+ * Return 0 on error.
+ */
+int
+__sflags(const char *mode, int *optr)
+{
+  int ret, m, o;
+
+  _DIAGASSERT(mode != NULL);
+
+  switch (*mode++) {
+
+    case 'r': /* open for reading */
+      ret = __SRD;
+      m = O_RDONLY;
+      o = 0;
+      break;
+
+    case 'w': /* open for writing */
+      ret = __SWR;
+      m = O_WRONLY;
+      o = O_CREAT | O_TRUNC;
+      break;
+
+    case 'a': /* open for appending */
+      ret = __SWR;
+      m = O_WRONLY;
+      o = O_CREAT | O_APPEND;
+      break;
+
+    default:  /* illegal mode */
+      errno = EINVAL;
+      return (0);
+  }
+
+  /*
+   * [rwa]\+ or [rwa]b\+ means read and write
+   * f means open only plain files.
+   */
+  for (; *mode; mode++)
+    switch (*mode) {
+    case '+':
+      ret = __SRW;
+      m = O_RDWR;
+      break;
+    case 'f':
+      o |= O_NONBLOCK;
+      break;
+    case 'b':
+      break;
+    default:  /* We could produce a warning here */
+      break;
+    }
+
+  *optr = m | o;
+  return (ret);
+}