mirror of
https://github.com/reactos/reactos.git
synced 2024-06-25 15:31:47 +00:00
128 lines
2.7 KiB
C
128 lines
2.7 KiB
C
/*
|
|
* FreeLoader
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include <freeldr.h>
|
|
|
|
#define TEXTMODE_BUFFER 0xb8000
|
|
#define TEXTMODE_BUFFER_SIZE 0x8000
|
|
|
|
#define TEXT_COLS 80
|
|
#define TEXT_LINES 25
|
|
|
|
VOID
|
|
PcConsPutChar(int Ch)
|
|
{
|
|
REGS Regs;
|
|
|
|
/* If we are displaying a CR '\n' then do a LF also */
|
|
if ('\n' == Ch)
|
|
{
|
|
/* Display the LF */
|
|
PcConsPutChar('\r');
|
|
}
|
|
|
|
/* If we are displaying a TAB '\t' then display 8 spaces ' ' */
|
|
if ('\t' == Ch)
|
|
{
|
|
/* Display the 8 spaces ' ' */
|
|
PcConsPutChar(' ');
|
|
PcConsPutChar(' ');
|
|
PcConsPutChar(' ');
|
|
PcConsPutChar(' ');
|
|
PcConsPutChar(' ');
|
|
PcConsPutChar(' ');
|
|
PcConsPutChar(' ');
|
|
PcConsPutChar(' ');
|
|
return;
|
|
}
|
|
|
|
/* Int 10h AH=0Eh
|
|
* VIDEO - TELETYPE OUTPUT
|
|
*
|
|
* AH = 0Eh
|
|
* AL = character to write
|
|
* BH = page number
|
|
* BL = foreground color (graphics modes only)
|
|
*/
|
|
Regs.b.ah = 0x0E;
|
|
Regs.b.al = Ch;
|
|
Regs.w.bx = 1;
|
|
Int386(0x10, &Regs, &Regs);
|
|
}
|
|
|
|
BOOLEAN
|
|
PcConsKbHit(VOID)
|
|
{
|
|
REGS Regs;
|
|
|
|
/* Int 16h AH=01h
|
|
* KEYBOARD - CHECK FOR KEYSTROKE
|
|
*
|
|
* AH = 01h
|
|
* Return:
|
|
* ZF set if no keystroke available
|
|
* ZF clear if keystroke available
|
|
* AH = BIOS scan code
|
|
* AL = ASCII character
|
|
*/
|
|
Regs.b.ah = 0x01;
|
|
Int386(0x16, &Regs, &Regs);
|
|
|
|
return 0 == (Regs.x.eflags & EFLAGS_ZF);
|
|
}
|
|
|
|
int
|
|
PcConsGetCh(void)
|
|
{
|
|
REGS Regs;
|
|
static BOOLEAN ExtendedKey = FALSE;
|
|
static char ExtendedScanCode = 0;
|
|
|
|
/* If the last time we were called an
|
|
* extended key was pressed then return
|
|
* that keys scan code. */
|
|
if (ExtendedKey)
|
|
{
|
|
ExtendedKey = FALSE;
|
|
return ExtendedScanCode;
|
|
}
|
|
|
|
/* Int 16h AH=00h
|
|
* KEYBOARD - GET KEYSTROKE
|
|
*
|
|
* AH = 00h
|
|
* Return:
|
|
* AH = BIOS scan code
|
|
* AL = ASCII character
|
|
*/
|
|
Regs.b.ah = 0x00;
|
|
Int386(0x16, &Regs, &Regs);
|
|
|
|
/* Check for an extended keystroke */
|
|
if (0 == Regs.b.al)
|
|
{
|
|
ExtendedKey = TRUE;
|
|
ExtendedScanCode = Regs.b.ah;
|
|
}
|
|
|
|
/* Return keystroke */
|
|
return Regs.b.al;
|
|
}
|
|
|
|
/* EOF */
|