__hdtoa
return (__hdtoa((double)e, xdigs, ndigits, decpt, sign, rve));
char *__hdtoa(double, const char *, int, int *, int *, char **);
__hdtoa(fparg.dbl, xdigs, prec,
__hdtoa(fparg.dbl, xdigs, prec,
__hdtoa(d, xdigs, prec,