1 files changed, 89 insertions, 0 deletions
diff --git a/StdLib/LibC/Uefi/InteractiveIO/NonCanonRead.c b/StdLib/LibC/Uefi/InteractiveIO/NonCanonRead.c
new file mode 100644
index 0000000000..15bf43e260
--- /dev/null
+++ b/StdLib/LibC/Uefi/InteractiveIO/NonCanonRead.c
@@ -0,0 +1,89 @@
+/** @file
+  NonCanonical Interactive Input Function.
+
+  The functions assume that isatty() is TRUE at the time they are called.
+  If _S_IWTTY is set, the device returns WIDE characters.
+
+  Copyright (c) 2012, 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 which 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.
+**/
+#include  <LibConfig.h>
+
+#include  <sys/syslimits.h>
+#include  <sys/termios.h>
+#include  <Device/IIO.h>
+#include  <Containers/Fifo.h>
+
+/** Perform a noncanonical read of input.
+
+    @param[in]    filp        Pointer to a file descriptor structure.
+    @param[in]    BufferSize  Maximum number of bytes to return.
+
+    @retval    -1   An error has occurred.  Reason in errno.
+    @retval    -1   No data returned.  None was ready.
+    @retval    >0   The number of elements returned
+**/
+ssize_t
+IIO_NonCanonRead (
+  struct __filedes *filp
+  )
+{
+  cIIO           *This;
+  cFIFO          *InBuf;
+  struct termios *Termio;
+  EFI_STATUS      Status;
+  ssize_t         NumRead;
+  cc_t            tioMin;
+  cc_t            tioTime;
+  UINT32          InputType;
+  wchar_t         InChar;     // Intermediate character buffer
+
+  NumRead = -1;
+  InChar  = 0;      // Initialize so compilers don't complain.
+  This    = filp->devdata;
+  Termio  = &This->Termio;
+  InBuf   = This->InBuf;
+  tioMin  = Termio->c_cc[VMIN];
+  tioTime = Termio->c_cc[VTIME];
+
+  if(tioMin >= MAX_INPUT) {
+    tioMin = MAX_INPUT;
+  }
+  /*  There are four types of processing that may be done, based on
+      the values of tioMin and tioTime.
+          Min   Time    Type
+          ---   ----    ----
+           0      0       0   Return buffer contents or 1 new char
+           0     >0       1   Return 0 or 1 character depending on timeout
+          >0      0       2   Buffer Min chars. Return BufferSize chars.
+          >0     >0       3   Return up to Min chars. Unless the inter-byte timer expires.
+
+    Currently, only type 0 is implemented.
+  */
+  InputType = 0;
+  if(tioMin   != 0)     InputType = 2;
+  if(tioTime  != 0)   ++InputType;
+  //switch(InputType) {
+  //  case 0:
+      if(InBuf->IsEmpty(InBuf)) {
+        NumRead = filp->f_ops->fo_read(filp, &filp->f_offset, sizeof(wchar_t), &InChar);
+        if(NumRead > 0) {
+          Status = InBuf->Write(InBuf, &InChar, 1);  // Buffer the character
+        }
+      }
+  //    break;
+  //  case 1:
+  //    break;
+  //  case 2:
+  //    break;
+  //  case 3:
+  //    break;
+  //}
+  return NumRead;
+}