6c6c850ad6
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
90 lines
2.8 KiB
C
90 lines
2.8 KiB
C
/** @file
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NonCanonical Interactive Input Function.
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The functions assume that isatty() is TRUE at the time they are called.
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If _S_IWTTY is set, the device returns WIDE characters.
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Copyright (c) 2012, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available
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under the terms and conditions of the BSD License which accompanies this
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distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <LibConfig.h>
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#include <sys/syslimits.h>
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#include <sys/termios.h>
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#include <Device/IIO.h>
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#include <Containers/Fifo.h>
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/** Perform a noncanonical read of input.
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@param[in] filp Pointer to a file descriptor structure.
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@param[in] BufferSize Maximum number of bytes to return.
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@retval -1 An error has occurred. Reason in errno.
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@retval -1 No data returned. None was ready.
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@retval >0 The number of elements returned
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**/
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ssize_t
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IIO_NonCanonRead (
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struct __filedes *filp
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)
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{
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cIIO *This;
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cFIFO *InBuf;
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struct termios *Termio;
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EFI_STATUS Status;
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ssize_t NumRead;
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cc_t tioMin;
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cc_t tioTime;
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UINT32 InputType;
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wchar_t InChar; // Intermediate character buffer
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NumRead = -1;
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InChar = 0; // Initialize so compilers don't complain.
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This = filp->devdata;
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Termio = &This->Termio;
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InBuf = This->InBuf;
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tioMin = Termio->c_cc[VMIN];
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tioTime = Termio->c_cc[VTIME];
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if(tioMin >= MAX_INPUT) {
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tioMin = MAX_INPUT;
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}
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/* There are four types of processing that may be done, based on
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the values of tioMin and tioTime.
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Min Time Type
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--- ---- ----
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0 0 0 Return buffer contents or 1 new char
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0 >0 1 Return 0 or 1 character depending on timeout
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>0 0 2 Buffer Min chars. Return BufferSize chars.
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>0 >0 3 Return up to Min chars. Unless the inter-byte timer expires.
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Currently, only type 0 is implemented.
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*/
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InputType = 0;
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if(tioMin != 0) InputType = 2;
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if(tioTime != 0) ++InputType;
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//switch(InputType) {
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// case 0:
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if(InBuf->IsEmpty(InBuf)) {
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NumRead = filp->f_ops->fo_read(filp, &filp->f_offset, sizeof(wchar_t), &InChar);
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if(NumRead > 0) {
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Status = InBuf->Write(InBuf, &InChar, 1); // Buffer the character
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}
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}
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// break;
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// case 1:
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// break;
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// case 2:
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// break;
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// case 3:
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// break;
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//}
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return NumRead;
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}
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