[Nut-upsuser] Maximum length of password

[gene heskett]

On Wednesday, 6 April 2022 07:28:59 EDT Roger Price wrote:
> 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.

That caveat might be ok but not for american keyboards as we don't know 
how in 99% of the cases, to command one of these keyboards to generate 
that accented character.

> Comments, as always, are welcome.
> Roger
> 
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Cheers, Gene Heskett.
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