Kaynağa Gözat

fix printf precision specifier for hex floats on non-ld80 archs

the code to perform rounding to the desired precision wrongly assumed
the long double mantissa was an integral number of nibbles (hex
digits) in length. this is true for 80-bit extended precision (64-bit
mantissa) but not for double (53) or quad (113).

scale the rounding value by 1<<(LDBL_MANT_DIG%4) to compensate.
Rich Felker 6 yıl önce
ebeveyn
işleme
cfa0a54c08
1 değiştirilmiş dosya ile 1 ekleme ve 0 silme
  1. 1 0
      src/stdio/vfprintf.c

+ 1 - 0
src/stdio/vfprintf.c

@@ -220,6 +220,7 @@ static int fmt_fp(FILE *f, long double y, int w, int p, int fl, int t)
 		else re=LDBL_MANT_DIG/4-1-p;
 
 		if (re) {
+			round *= 1<<(LDBL_MANT_DIG%4);
 			while (re--) round*=16;
 			if (*prefix=='-') {
 				y=-y;