1 files changed, 117 insertions, 0 deletions
diff --git a/StdLib/LibC/Stdio/stdio.c b/StdLib/LibC/Stdio/stdio.c
new file mode 100644
index 0000000000..005a4388df
--- /dev/null
+++ b/StdLib/LibC/Stdio/stdio.c
@@ -0,0 +1,117 @@
+/** @file
+    Small standard I/O/seek/close functions.
+    These maintain the `known seek offset' for seek optimisation.
+
+    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: stdio.c,v 1.13 2003/08/07 16:43:33 agc Exp
+    stdio.c 8.1 (Berkeley) 6/4/93
+**/
+#include  <LibConfig.h>
+
+#include  "namespace.h"
+
+#include  <assert.h>
+#include  <errno.h>
+#include  <fcntl.h>
+#include  <stdio.h>
+#include  <sys/EfiSysCall.h>
+
+#include  "reentrant.h"
+#include  "local.h"
+
+int
+__sread(void *cookie, char *buf, int n)
+{
+  FILE *fp = cookie;
+  int ret;
+
+  _DIAGASSERT(fp != NULL);
+  _DIAGASSERT(buf != NULL);
+
+  ret = (int)read(fp->_file, buf, (size_t)n);
+  /* if the read succeeded, update the current offset */
+  if (ret >= 0)
+    fp->_offset += ret;
+  else
+    fp->_flags &= ~__SOFF;  /* paranoia */
+  return (ret);
+}
+
+int
+__swrite(void *cookie, char const *buf, int n)
+{
+  FILE *fp = cookie;
+
+  _DIAGASSERT(cookie != NULL);
+  _DIAGASSERT(buf != NULL);
+
+  if (fp->_flags & __SAPP)
+    (void) lseek(fp->_file, (off_t)0, SEEK_END);
+  fp->_flags &= ~__SOFF;  /* in case FAPPEND mode is set */
+  return (int)(write(fp->_file, (char *)buf, (size_t)n));
+}
+
+fpos_t
+__sseek(void *cookie, fpos_t offset, int whence)
+{
+  FILE *fp = cookie;
+  off_t ret;
+
+  _DIAGASSERT(fp != NULL);
+
+  ret = lseek(fp->_file, (off_t)offset, whence);
+  if (ret == -1L)
+    fp->_flags &= ~__SOFF;
+  else {
+    fp->_flags |= __SOFF;
+    fp->_offset = ret;
+  }
+  return (ret);
+}
+
+int
+__sclose(void *cookie)
+{
+
+  _DIAGASSERT(cookie != NULL);
+
+  return (close(((FILE *)cookie)->_file));
+}