I am wondering if we can assume that nl_langinfo() exists on all platforms that we care about. It's part of POSIX. I ask because if it doesn't exist I'm not sure how we get the current character set. My feeling is in this day and age we should assume it exists.
I would assume a locale of "C" in the absence of ml_langinfo(). That's the default locale if there are no $LANG or $LC_* definitions in scope, and the behaviour is intended to be backwards compatible with the pre-locale UNIX behaviour. --lyndon
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