I do agree that mp->hghmsg++ is simpler than the whole chunk of code
(which I copied from folder_addmsg). I do think that mp->lowmsg
should be set to 1 if it was zero, though (since there is no message
number 0). Here's why:
Both calls to folder_realloc() in inc.c use 'mp->lowoff', not 'mp->lowmsg'
for the second argument 'int lo'. In 'folder_read()', this value will be
at least 1, so the particular code you mention won't fail.
In principle, I agree wholeheartedly about rigorous maintenance of state
variables. The whole business of dealing with the variables in
'struct msgs' would be better handled with a C++ class, or just subroutines
that are called when members need to be changed.
However, the nmh code set is a bit of jumble, and I really worry about
unintended side effects of a change that on the surface makes perfect sense.
So at this point I'd want to study the handling of 'mp->lowmsg' before
making the change.
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