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| author | darylm503 <darylm503@6f19259b-4bc3-4df7-8a09-765794883524> | 2012-12-11 21:19:14 +0000 |
|---|---|---|
| committer | darylm503 <darylm503@6f19259b-4bc3-4df7-8a09-765794883524> | 2012-12-11 21:19:14 +0000 |
| commit | 6c6c850ad62d6fdc73828057339be1dc7df37c8e (patch) | |
| tree | a61c6d2725dd186f3affcb9b00b8d4caf2ea1ee6 /StdLib/LibC/Uefi/InteractiveIO/NonCanonRead.c | |
| parent | e575c101d866bb895ac2fab538bc2ed074163af3 (diff) | |
| download | edk2-6c6c850ad62d6fdc73828057339be1dc7df37c8e.tar.gz edk2-6c6c850ad62d6fdc73828057339be1dc7df37c8e.tar.bz2 edk2-6c6c850ad62d6fdc73828057339be1dc7df37c8e.zip | |
StdLib: Add terminal type line editing (Interactive IO) for console devices.
Adds a subset of the terminal I/O capabilities described in the Single Unix Specification, V4.
Supports:
Erase previous character. Default is Backspace or ^H
Erase line. Default is ^U
TAB characters are supported and, by default, are rendered as 8 spaces. They will still be read as a single TAB character.
Both Canonical and Non-Canonical modes are supported.
If a terminal device is opened with O_TTY_INIT in the mode, the device will be initialized to "sane" values for interactive use. It will be in Canonical mode, Enter will be translated to NewLine and on output, a NewLine is translated to CRLF. Echoing will be on, control characters are output as ^X, and TABs are expanded.
See the new <sys/termios.h> file for more information.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: daryl.mcdaniel@intel.com
Reviewed-by: erik.c.bjorge@intel.com
Reviewed-by: leroy.p.leahy@intel.com
Reviewed-by: lee.g.rosenbaum@intel.com
Reviewed-by: jaben.carsey@intel.com
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13989 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'StdLib/LibC/Uefi/InteractiveIO/NonCanonRead.c')
| -rw-r--r-- | StdLib/LibC/Uefi/InteractiveIO/NonCanonRead.c | 89 |
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;
+}
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