From 51ab6db4ed115d079d7131975e4adb074ba9ef9d Mon Sep 17 00:00:00 2001 From: Szabolcs Nagy Date: Wed, 12 Oct 2016 00:49:59 +0200 Subject: [PATCH] fix float formatting of some exact halfway cases in nearest rounding mode exact halfway cases were not following the round to even rule if the rounding happened at a base 1000000000 digit boundary of the internal representation and the previous digit was odd. e.g. printf("%.0f", 1.5) printed 1 instead of 2. --- src/stdio/vfprintf.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/src/stdio/vfprintf.c b/src/stdio/vfprintf.c index e2ab2dc6..60da14d8 100644 --- a/src/stdio/vfprintf.c +++ b/src/stdio/vfprintf.c @@ -345,7 +345,8 @@ static int fmt_fp(FILE *f, long double y, int w, int p, int fl, int t) if (x || d+1!=z) { long double round = 2/LDBL_EPSILON; long double small; - if (*d/i & 1) round += 2; + if ((*d/i & 1) || (i==1000000000 && d>a && (d[-1]&1))) + round += 2; if (x