Asynchronous Serial Communications Programmer's Reference Manual (32022-90052)

Chapter 3 83

Common Device Control Functions

Altering Terminal Deﬁceﬁles

must explicitly disable transparent editing, either by issuing an

FCLOSE against the device, or by calling the intrinsic used to set

transparent mode again with both the EOR and subsystem break

characters set to null.

The code fragment shown in Figure 3-8 provides an example of enabling

transparent editing mode through FCONTROL(41). This FCONTROL

uses param to set new values for the EOR character (in the low order

byte) and the subsystem break character (in the high order byte). In the

example, the

bkeor

variable is set to 6433, to specify that an

exclamation point (!) is the new EOR character and

[CTRL]Y is the

subsystem break character. Any subsequent read will recognize and

treat these characters accordingly and strip them from the input

stream.

A similar code fragment, setting

bkeor

to 0, could be used to disable

transparent editing mode.

See Chapter 4, “Using FDEVICECONTROL,” for an example of using

FDEVICECONTROL to enable transparent editing mode.