Non-ASCII Characters - E1.20 RDM (Remote Device Management) Protocol Forums

ericthegeek · July 22nd, 2016

Yes, null termination of strings is allowed.

10.1 says:
Text fields shall terminate based on Parameter Data Length, however if a NULL is encountered then that shall also act as a terminator for the text field.

So, in your "QUADRATIC",<0x00>,"abcdefghijklmnopqrstuv" example, the receiver should display "QUADRATIC" properly.

Personally, I don't like null termination, I think length termination is more in keeping with the spirit of RDM. But given the number of C programmers in the world that are more comfortable with null termination, there's nothing wrong with using it.

hamish · July 22nd, 2016

Not sure I'm quite on the same page, the standard, as it is written, may not be entierly expicit.

If as is suggested, null termination is generally acceptable, then I would expect the relevant text to read something akin to

Text fields shall either terminate based on Parameter Data Length or when a NULL is encountered.

IMO The standard states that string lengths shall be PDL determined,
this being the correct approach. It then ads a caveat with the statement however, determining the appropriate treatment, in the case of a null character being encountered.

By using PDL length determined strings, there is no doubt that the implimentation will be compliant with the standard.

July 22nd, 2016	#2
hamish Member Join Date: Apr 2009 Location: Dartmoor, Devon, England Posts: 56	Not sure I'm quite on the same page, the standard, as it is written, may not be entierly expicit. If as is suggested, null termination is generally acceptable, then I would expect the relevant text to read something akin to Text fields shall either terminate based on Parameter Data Length or when a NULL is encountered. IMO The standard states that string lengths shall be PDL determined, this being the correct approach. It then ads a caveat with the statement however, determining the appropriate treatment, in the case of a null character being encountered. By using PDL length determined strings, there is no doubt that the implimentation will be compliant with the standard. __________________ ______________________________________________ Hamish Dumbreck

July 22nd, 2016	#1
ericthegeek Task Group Member Join Date: Aug 2008 Posts: 390	Yes, null termination of strings is allowed. 10.1 says: Text fields shall terminate based on Parameter Data Length, however if a NULL is encountered then that shall also act as a terminator for the text field. So, in your "QUADRATIC",<0x00>,"abcdefghijklmnopqrstuv" example, the receiver should display "QUADRATIC" properly. Personally, I don't like null termination, I think length termination is more in keeping with the spirit of RDM. But given the number of C programmers in the world that are more comfortable with null termination, there's nothing wrong with using it.