wcsrtombs_l
extern size_t wcsrtombs_l(char *_RESTRICT_KYWD, const wchar_t **_RESTRICT_KYWD,
(void) wcsrtombs_l(sformat, &formatp, sflen + 1, &mbs, loc);
sflen = wcsrtombs_l(NULL, &formatp, 0, &mbs, loc);
return (wcsrtombs_l(dst, src, len, ps, uselocale(NULL)));
cnt = wcsrtombs_l(mbs, &wcs, sizeof (mbs), &ms, loc);
cnt = wcsrtombs_l(mbs, &wcs, sizeof (mbs), &ms, loc);