Re: empty quoted strings and other oddities
Bruce Lilly <blilly@erols.com> Thu, 03 October 2002 23:20 UTC
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Date: Thu, 03 Oct 2002 19:19:52 -0400
From: Bruce Lilly <blilly@erols.com>
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Organization: Bruce Lilly
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To: Keith Moore <moore@cs.utk.edu>
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Subject: Re: empty quoted strings and other oddities
References: <200210031316.g93DGJ002707@astro.cs.utk.edu>
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Keith Moore wrote: > first of all, it's really not a boundary condition - it's just one example > of an invalid address It's a boundary condition as it's a unique case (zero content). > second, your conclusion doesn't follow even if > it is a boundary condition - all that is necessary is that it not cause > any problems. An MTA or MUA that does not handle [] well may indeed cause problems. That might range from (multiple) DNS lookups of garbage, or malformed DNS lookups to a program crash. > well, it's not like those thousands of existing implementations of email > software are going to change their implementation techniques just to > accomodate this case. If it becomes a MUST NOT generate construct, damage can be prevented even if an existing defective implementation of a receiver does not change. > as for use of lex, I've tried it. it's not a good fit. 2822 syntax analysis > is somewhat context-dependent (is "Mon" a day or an atom?), good error > recovery is difficult, and you need to have the lexical analyzer recover from > common syntax errors (such as putting dot in a phrase) in situations where > look-ahead is required to disambiguate that kind of error from other > errors. > > Having done both, I can confidently say that it's easier to write correct > C code to do the scanning than to write correct lex code to do it. Having done both, I've come to the opposite conclusion, but that's a bit off topic. > adding cruft to the standard (or to code) to detect cases which > never happen is not progress. We're not talking about detection, but rather about relegating a useless and potentially troublesome construct to MUST NOT generate status. > progress is increasing the reliability > of mail delivery. Is that relevant to the message format (as opposed to transport methods and protocols)?
- Re: empty quoted strings and other oddities Charles Lindsey
- Re: empty quoted strings and other oddities Russ Allbery
- empty quoted strings and other oddities Bruce Lilly
- Re: empty quoted strings and other oddities Bruce Lilly
- Re: empty quoted strings and other oddities Kai Henningsen
- Re: empty quoted strings and other oddities Kai Henningsen
- Re: empty quoted strings and other oddities ned+ietf-822
- Re: empty quoted strings and other oddities Jacob Palme
- Re: empty quoted strings and other oddities Charles Lindsey
- Re: empty quoted strings and other oddities Jacob Palme
- Re: empty quoted strings and other oddities Keith Moore
- Re: empty quoted strings and other oddities Bruce Campbell
- Re: empty quoted strings and other oddities Keith Moore
- Re: empty quoted strings and other oddities Keith Moore
- Re: empty quoted strings and other oddities Keith Moore
- Re: empty quoted strings and other oddities Gary Feldman
- Re: empty quoted strings and other oddities Gary Feldman
- Re: empty quoted strings and other oddities Jacob Palme
- Re: empty quoted strings and other oddities Bruce Lilly
- Re: empty quoted strings and other oddities Bruce Lilly
- Re: empty quoted strings and other oddities Keith Moore
- Re: empty quoted strings and other oddities Keith Moore
- Re: empty quoted strings and other oddities Gary Feldman
- Re: empty quoted strings and other oddities Arnt Gulbrandsen
- Re: empty quoted strings and other oddities Keith Moore
- Re: empty quoted strings and other oddities Gary Feldman
- Re: empty quoted strings and other oddities Keith Moore
- Re: empty quoted strings and other oddities Bruce Lilly
- Re: empty quoted strings and other oddities Keith Moore