c/string/wide/wcslen

@1@ Returns the length of a wide string, that is the number of non-null wide characters that precede the terminating null wide character. @2@ Same as, except that the function returns zero if is a null pointer and returns  if the null wide character was not found in the first  wide characters of

Return value
@1@ The length of the null-terminated wide string. @2@ The length of the null-terminated wide string on success, zero if  is a null  pointer,  if the null wide character was not found.