[tz] zone file format very strict

[Paul Eggert]

On 4/1/22 10:27, Paul Eggert wrote:
>> does not suffer a trailing TAB character, behind the +0430
> I'm not seeing the problem.

Although I'm still not seeing a problem with a trailing TAB, after 
staring at the code a bit I do see problems if the input contains a NUL 
byte, along with misleading diagnostics if the input ends in a 
non-newline and/or has a very long input line. Also, POSIX raised its 
line length limit from 512 to 2048 bytes, and zic's memory allocation 
can be simplified a bit. I installed the attached proposed patches to 
fix the issues I found. However, I don't think these changes will affect 
the problem you mentioned.
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