wmemchr
extern wchar_t *wmemchr(const wchar_t *wcs, wchar_t wc, size_t n);
t = wmemchr ((void *) fp->_wide_data->_IO_read_ptr, delim, len);
extern wchar_t *wmemchr (__const wchar_t *__s, wchar_t __c, size_t __n)
B_DEFINE_WEAK_ALIAS(__wmemchr, wmemchr);
const wchar_t* result = wmemchr(string, ch, 0);
const wchar_t* result = wmemchr(string, ch, 0);
const wchar_t* result = wmemchr(string, ch, 1);
const wchar_t* result = wmemchr(string, ch, 8);
const wchar_t* result = wmemchr(string, ch, 9);
const wchar_t* result = wmemchr(string, ch, 9);
const wchar_t* result = wmemchr(string, ch, 4);
const wchar_t* result = wmemchr(string, ch, 9);