/*
* Set the current cursor position.
* Params:
* state->ebx - new row value
* state->ecx - new column value
* Returns: 0 if successful, -1 otherwise
*/
static int Sys_PutCursor(struct Interrupt_State* state)
{
if (Put_Cursor(state->ebx, state->ecx))
return 0;
else
return -1;
}
/*
* The workhorse output function.
* Depending on the current console output state,
* does literal character output or processes part of
* an escape sequence.
*/
static void Put_Char_Imp(int c) {
again:
switch (s_cons.state) {
case S_NORMAL:
if(c == ESC)
Start_Escape();
else
Output_Literal_Character(c);
break;
case S_ESC:
if(c == '[')
s_cons.state = S_ESC2;
else
Reset();
break;
case S_ESC2:
if(ISDIGIT(c)) {
Start_Arg(0);
goto again;
} else if(c == ';') {
/* Special case: for "n;m" commands, "n" is implicitly 1 if omitted */
Start_Arg(0);
Add_Digit('1');
Start_Arg(1);
} else {
s_cons.state = S_CMD;
goto again;
}
break;
case S_ARG:
if(ISDIGIT(c))
Add_Digit(c);
else if(c == ';')
Start_Arg(s_cons.numArgs);
else {
s_cons.state = S_CMD;
goto again;
}
break;
case S_CMD:
switch (c) {
case 'K':
Clear_To_EOL();
break;
case 's':
Save_Cursor();
break;
case 'u':
Restore_Cursor();
break;
case 'A':
Move_Cursor(s_cons.row - Get_Arg(0), s_cons.col);
break;
case 'B':
Move_Cursor(s_cons.row + Get_Arg(0), s_cons.col);
break;
case 'C':
Move_Cursor(s_cons.row, s_cons.col + Get_Arg(0));
break;
case 'D':
Move_Cursor(s_cons.row, s_cons.col - Get_Arg(0));
break;
case 'm':
Update_Attributes();
break;
case 'f':
case 'H':
if(s_cons.numArgs == 2)
Move_Cursor(Get_Arg(0) - 1, Get_Arg(1) - 1);
break;
case 'J':
if(s_cons.numArgs == 1 && Get_Arg(0) == 2) {
Clear_Screen();
Put_Cursor(0, 0);
}
break;
default:
break;
}
Reset();
break;
default:
KASSERT(false);
}
}
/*
* Set the current cursor position.
* Params:
* state->ebx - new row value
* state->ecx - new column value
* Returns: 0 if successful, -1 otherwise
*/
static int Sys_PutCursor(struct Interrupt_State *state) {
return Put_Cursor(state->ebx, state->ecx) ? 0 : -1;
}
