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C Language Programming Library Reference Guide

stdlib.h - Multibyte Functions - mblen

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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