I don't think that get_charset() can return NULL, because I don't
think that nl_langinfo() can. (As an aside, nl_langinfo() can
return an empty string, but I don't think nl_langinfo(CODESET)
will, at least in practice.)
I could be persuaded this is true, but the standards are silent on
this issue.
This thread might help:
http://lists.gnu.org/archive/html/nmh-workers/2006-08/msg00000.html
That seems to date back when we didn't support retrieving the character
set from the locale, and you had to use MM_CHARSET. Seems like this
problem got solved a while ago.
FWIW, I looked at mutt and it's fallback if the locale is US-ASCII but
the characters are 8bit is to output "unknown-8bit" as the charset.
Seems like a reasonable idea to me.
--Ken
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