Follow-up Comment #2, bug #23685 (project avrdude):
I would solve the problem by introducing another method in the programmer data
structure.
const char* select_port(
const char* port, /* from cmd line */
const char* default_serial, /* value of default_serial */
const char* default_parallel /* value of default_parallel */
)
The provided function has to return the correct value.
If port is given it returns port otherwise it returns the serial or parallel
value.
An USB programmer could also return a string like "usb" or anything else. When
we define that the function is called after pgm->setup() and the returned
value is not used after pgm->teardown(), the programmer also could create in
its private data a dynamic created string. (For example when programmers check
the usb ports to find the right device, they could show to used port here.)
PS:
Maybe we also should introduce a default_usb value (and add it to parameter
list above) as new programmers are likely to be connected by usb (or a serial
emulation).
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