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