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stdlib.h - Multibyte Functions - mbtowc

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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