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The behavior of the multibyte functions are affected by the
setting of LC_CTYPE in the location
settings.
Declaration:
int mblen(const char *str,
size_t n);
Returns the length of a multibyte character pointed to by the
argument str. At most n bytes will be examined.
If str is a null pointer, then zero is returned if
multibyte characters are not state-dependent (shift state).
Otherwise a nonzero value is returned if multibyte character are
state-dependent.
If str is not null, then the number of bytes that are
contained in the multibyte character pointed to by str
are returned. Zero is returned if str points to a null
character. A value of -1 is returned if str does not
point to a valid multibyte character.
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