diff options
Diffstat (limited to 'StdLib/LibC/Uefi/InteractiveIO/IIOecho.c')
| -rw-r--r-- | StdLib/LibC/Uefi/InteractiveIO/IIOecho.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/StdLib/LibC/Uefi/InteractiveIO/IIOecho.c b/StdLib/LibC/Uefi/InteractiveIO/IIOecho.c new file mode 100644 index 0000000000..14369de95b --- /dev/null +++ b/StdLib/LibC/Uefi/InteractiveIO/IIOecho.c @@ -0,0 +1,141 @@ +/** @file
+ Echo characters to an Interactive I/O Output device.
+
+ The functions assume that isatty() is TRUE at the time they are called.
+ Since the UEFI console is a WIDE character device, these functions do all
+ processing using wide characters.
+
+ It is the responsibility of the caller, or higher level function, to perform
+ any necessary translation between wide and narrow 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 <Uefi.h>
+
+#include <LibConfig.h>
+
+#include <assert.h>
+#include <errno.h>
+#include <sys/termios.h>
+#include <Device/IIO.h>
+#include "IIOutilities.h"
+#include "IIOechoCtrl.h"
+
+/** Echo one character to an IIO file.
+
+ If character InCh is a special "echo control" character, process it and output
+ the resultant character(s), if any. Otherwise pass the character on to the
+ IIO_WriteOne() function which performs generic output processing, if needed.
+
+ @param[in] filp Pointer to an open IIO file's file descriptor structure.
+ @param[in] InCh The wide character to be echoed.
+ @param[in] EchoIsOK A flag indicating whether echoing is appropriate for this
+ device or not.
+
+ @retval -1 The filp argument does not refer to an IIO device.
+ Global value errno is set to EINVAL.
+ @retval >=0 The number of characters actually output.
+
+ @sa IIO_WriteOne
+**/
+ssize_t
+IIO_EchoOne (
+ struct __filedes *filp,
+ wchar_t InCh,
+ BOOLEAN EchoIsOK
+ )
+{
+ cIIO *This;
+ cFIFO *OutBuf;
+ cFIFO *InBuf;
+ UINT8 *AttrBuf;
+ ssize_t NumEcho;
+ tcflag_t LFlags;
+ UINT32 AttrDex;
+ int i;
+
+ NumEcho = -1;
+ This = filp->devdata;
+
+ if(This != NULL) {
+ LFlags = This->Termio.c_lflag;
+ OutBuf = This->OutBuf;
+ InBuf = This->InBuf;
+ AttrBuf = This->AttrBuf;
+ AttrDex = InBuf->GetWDex(InBuf);
+
+ switch(InCh) {
+ case IIO_ECHO_DISCARD:
+ // Do not buffer or otherwise process
+ NumEcho = 0;
+ break;
+
+ case IIO_ECHO_ERASE:
+ // Delete last character from InBuf
+ if(!InBuf->IsEmpty(InBuf)) {
+ (void)InBuf->Truncate(InBuf);
+
+ // Erase screen character(s) based on Attrib value
+ if(LFlags & ECHO) {
+ AttrDex = (UINT32)ModuloDecrement(AttrDex, InBuf->NumElements);
+ NumEcho = AttrBuf[AttrDex];
+ for(i = 0; i < NumEcho; ++i) {
+ (void)IIO_WriteOne(filp, OutBuf, CHAR_BACKSPACE);
+ }
+ if(LFlags & ECHOE) {
+ for(i = 0; i < NumEcho; ++i) {
+ (void)IIO_WriteOne(filp, OutBuf, L' ');
+ }
+ for(i = 0; i < NumEcho; ++i) {
+ (void)IIO_WriteOne(filp, OutBuf, CHAR_BACKSPACE);
+ }
+ }
+ }
+ else {
+ NumEcho = 0;
+ }
+ }
+ break;
+
+ case IIO_ECHO_KILL:
+ // Flush contents of InBuf and OutBuf
+ InBuf->Flush(InBuf, (size_t)-1);
+ OutBuf->Flush(OutBuf, (size_t)-1);
+
+ // Erase characters from screen.
+ if(LFlags & ECHOE) {
+ NumEcho = IIO_CursorDelta(This, &This->InitialXY, &This->CurrentXY);
+ for(i = 0; i < NumEcho; ++i) {
+ (void)IIO_WriteOne(filp, OutBuf, L' ');
+ }
+ }
+ break;
+
+ default:
+ // Add character to input buffer
+ (void)InBuf->Write(InBuf, &InCh, 1);
+
+ NumEcho = 0; // In case echoing is not enabled or OK
+ // If echoing is OK and enabled, "echo" character using IIO_WriteOne
+ if( EchoIsOK &&
+ ( (LFlags & ECHO) ||
+ ((LFlags & ECHONL) && (InCh == CHAR_LINEFEED))))
+ {
+ NumEcho = IIO_WriteOne(filp, OutBuf, InCh);
+ }
+ AttrBuf[AttrDex] = (UINT8)NumEcho;
+ break;
+ }
+ }
+ else {
+ errno = EINVAL;
+ }
+ return NumEcho;
+}
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