__wcsrtombs
extern size_t __wcsrtombs(char *dest, const wchar_t **src, size_t destLength,
extern size_t __wcsrtombs (char *__restrict __dst,
len = __wcsrtombs (string, &s2, prec, &mbstate); \
len = __wcsrtombs (NULL, &s2, 0, &mbstate); \
(void) __wcsrtombs (string, &s2, len + 1, &mbstate); \
B_DEFINE_WEAK_ALIAS(__wcsrtombs, wcsrtombs);
return __wcsrtombs(s, &pwcs, n, &internalMbState);