Declaration:
int mbtowc(whcar_t *pwc,
const char *str, size_t
n);
Examines the multibyte character pointed to by the argument
str. The value is converted and stored in the argument
pwc if pwc is not null. It scans at most n
bytes.
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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