On Wed, 6 Apr 2022, Jim Klimov wrote:

Also does not seem dictated in docs nor comments. De-facto it is a string pointer, in some code constrained by a SMALLBUF sized character array, where SMALLBUF is a macro currently defined to 512.

I decided to fix arbitrary limits in the grammar based on the principle "Be strict in what you send, and generous in what you accept".

 UPS name maximum characters : 15
 User name maximum characters : 15
 Password maximum characters : 31
 SET VAR <upsname> <varname> "<value>", <value> maximum characters : 63

Since the IETF's ABNF grammar rules are US-ASCII based, I added the note:

 Implementation note: The ANBF is written using the provisions of [RFC5234]
 [RFC7405] which are US-ASCII based. Implementors should be aware that NUT
 itself is Unicode based and that where the grammar specifies ALPHA = %x41-5A /
 %x61-7A ; A-Z / a-z an implementation should expect letters outside the range
 specified by ALPHA.

For example a USERNAME value may contain accented letters.

Comments, as always, are welcome.
Roger

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