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/*
* break
*/
static int cmd_break(struct cmd_funcparam *p) {
unsigned char brkflag = 0;
if (cmd_ishlp(p)) {
outputnl("Sets or clears extended CTRL+C checking");
outputnl("");
outputnl("BREAK [ON | OFF]");
outputnl("");
outputnl("Type BREAK without a parameter to display the current BREAK setting.");
return(-1);
}
/* no params: display current break state */
if (p->argc == 0) {
_asm {
push ax
push dx
mov ax, 0x3300 /* query break-check flag */
int 0x21 /* status (0=OFF, 1=ON) in DL */
mov [brkflag], dl
pop dx
pop ax
}
if (brkflag == 0) {
outputnl("BREAK is off");
} else {
outputnl("BREAK is on");
}
return(-1);
}
/* too many params? */
if (p->argc > 1) {
outputnl("Too many parameters");
return(-1);
}
/* exactly 1 parameter - "on" or "off" */
if (imatch(p->argv[0], "on")) {
brkflag = 1;
} else if (!imatch(p->argv[0], "off")) {
outputnl("Invalid parameter");
return(-1);
}
/* set break accordingly to brkflag */
_asm {
push ax
push dx
mov ax, 0x3301 /* set break-check level */
mov dl, [brkflag] /* 0=OFF 1=ON */
int 0x21
pop dx
pop ax
}
return(-1);
}