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/** @file
Write 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>
static wchar_t Spaces[] = L" "; // Spaces for expanding TABs
#define MAX_TAB_WIDTH ((int)(sizeof(Spaces) / sizeof(wchar_t)) - 1)
#define MAX_EXPANSION 3
/** Process and buffer one character for output.
@param[in] filp Pointer to a file descriptor structure.
@param[out] OBuf Pointer to the Output Buffer FIFO.
@param[in] InCh The wide character to process.
@retval <0 An error occurred. Reason is in errno.
* EINVAL The pointer to the IIO object is NULL.
* ENOSPC The OBuf FIFO is full.
@retval 0 A character was input but not placed in the output buffer.
@retval >0 The number of characters buffered. Normally 1, or 2.
If a character is discarded because of flag settings, a
1 will be returned.
**/
ssize_t
IIO_WriteOne(struct __filedes *filp, cFIFO *OBuf, wchar_t InCh)
{
cIIO *This;
struct termios *Termio;
tcflag_t OFlag;
ssize_t RetVal;
wchar_t wc[MAX_EXPANSION]; // Sub-buffer for conversions
wchar_t *wcb; // Pointer to either wc or spaces
int numW = 0; // Wide characters placed in OBuf
INT32 TabWidth; // Each TAB expands into this number of spaces
UINT32 CurColumn; // Current cursor column on the screen
UINT32 CurRow; // Current cursor row on the screen
UINT32 PrevColumn; // Previous column. Used to detect wrapping.
UINT32 AdjColumn; // Current cursor column on the screen
UINT32 AdjRow; // Current cursor row on the screen
RetVal = -1;
wcb = wc;
This = filp->devdata;
if((This != NULL) && (OBuf->FreeSpace(OBuf, AsElements) >= MAX_EXPANSION)) {
Termio = &This->Termio;
OFlag = Termio->c_oflag;
TabWidth = (INT32)This->Termio.c_cc[VTABLEN];
if(TabWidth > MAX_TAB_WIDTH) {
TabWidth = MAX_TAB_WIDTH;
}
CurColumn = This->CurrentXY.Column;
CurRow = This->CurrentXY.Row;
numW = 1; // The majority of characters buffer one character
AdjRow = 0; // Most characters just cause horizontal movement
AdjColumn = 0;
if(OFlag & OPOST) {
/* Perform output processing */
switch(InCh) {
case CHAR_TAB: //{{
if(OFlag & OXTABS) {
if(TabWidth > 0) {
int SpaceIndex;
SpaceIndex = CurColumn % TabWidth; // Number of spaces after a Tab Stop
numW = TabWidth - SpaceIndex; // Number of spaces to the next Tab Stop
SpaceIndex = MAX_TAB_WIDTH - numW; // Index into the Spaces array
wcb = &Spaces[SpaceIndex]; // Point to the appropriate number of spaces
}
else {
wc[0] = L' ';
}
AdjColumn = numW;
}
else {
wc[0] = InCh; // Send the TAB itself - assumes that it does not move cursor.
}
break; //}}
case CHAR_CARRIAGE_RETURN: //{{
if((OFlag & OCRNL) == 0) {
if((OFlag & ONLRET) == 0) {
numW = 0; /* Discard the CR */
// Cursor doesn't move
}
else {
wc[0] = CHAR_CARRIAGE_RETURN;
CurColumn = 0;
}
break;
}
else {
InCh = CHAR_LINEFEED;
} //}}
// Fall through to the NL case
case CHAR_LINEFEED: //{{
if(OFlag & ONLCR) {
wc[0] = CHAR_CARRIAGE_RETURN;
wc[1] = CHAR_LINEFEED;
numW = 2;
CurColumn = 0;
}
AdjRow = 1;
break; //}}
case CHAR_BACKSPACE: //{{
if(CurColumn > 0) {
wc[0] = CHAR_BACKSPACE;
CurColumn = (UINT32)ModuloDecrement(CurColumn, (UINT32)This->MaxColumn);
}
else {
numW = 0; // Discard the backspace if in column 0
}
break; //}}
case CHAR_EOT: //{{
if(OFlag & ONOEOT) {
numW = 0; // Discard the EOT character
// Cursor doesn't move
break;
} //}}
// Fall through to default in order to potentially output "^D"
default: //{{
if((InCh >= 0) && (InCh < L' ')) {
// InCh contains a control character
if(OFlag & OCTRL) {
wc[1] = InCh + L'@';
wc[0] = L'^';
numW = 2;
AdjColumn = 2;
}
else {
numW = 0; // Discard. Not a UEFI supported control character.
}
}
else {
// Regular printing character
wc[0] = InCh;
AdjColumn = 1;
}
break; //}}
}
if(numW < MAX_EXPANSION) {
wc[numW] = 0; // Terminate the sub-buffer
}
if(AdjColumn != 0) {
// Adjust the cursor position
PrevColumn = CurColumn;
CurColumn = ModuloAdd(PrevColumn, AdjColumn, (UINT32)This->MaxColumn);
if(CurColumn < PrevColumn) {
// We must have wrapped, so we are on the next Row
++CurRow;
if(CurRow >= This->MaxRow) {
// The screen has scrolled so need to adjust Initial location.
--This->InitialXY.Row; // Initial row has moved up one
CurRow = (UINT32)(This->MaxRow - 1); // We stay on the bottom row
}
}
}
This->CurrentXY.Column = CurColumn;
This->CurrentXY.Row = CurRow;
}
else {
// Output processing disabled -- RAW output mode
wc[0] = InCh;
wc[1] = 0;
}
// Put the character(s) into the output buffer
if(numW > 0) {
(void)OBuf->Write(OBuf, (const void *)wcb, (size_t)numW);
}
RetVal = numW;
}
else {
if(This == NULL) {
errno = EINVAL;
}
else {
errno = ENOSPC;
}
}
return RetVal;
}
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