MAXFCVT
char buf[max(MAXDIGS, max(MAXFCVT + DMAXEXP, MAXECVT) + 1)];
min(prec, MAXFCVT),
n = min(prec, MAXFCVT);
FPCONV(qfconvert, &qval, min(prec, MAXFCVT),
FPCONV(fconvert, dval, min(prec, MAXFCVT),
nn = min(prec, MAXFCVT);
char buf[max(MAXDIGS, 1+max(MAXFCVT+MAXEXP, MAXECVT))];
bp = fcvt(dval, min(prec, MAXFCVT), &decpt, &sign);
nn = min(prec, MAXFCVT);