Implement mblen(s, n) as mbtowc(NULL, s, n) to avoid calling sgetrune() and to simplify things. This is only valid until we start supporting state-dependent encodings.
Implement mblen(s, n) as mbtowc(NULL, s, n) to avoid calling sgetrune()
and to simplify things. This is only valid until we start supporting
state-dependent encodings.

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