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authorSzabolcs Nagy <nsz@port70.net>2016-10-12 00:49:59 +0200
committerRich Felker <dalias@aerifal.cx>2016-10-20 01:54:15 -0400
commit51ab6db4ed115d079d7131975e4adb074ba9ef9d (patch)
tree06791593d873bbe64a5c6c04ddf0420686e9a653 /src/stdio/vfprintf.c
parent8fb28b0b3e7a5e958fb844722a4b2ef9bc244af1 (diff)
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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.
Diffstat (limited to 'src/stdio/vfprintf.c')
-rw-r--r--src/stdio/vfprintf.c3
1 files changed, 2 insertions, 1 deletions
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<i/2) small=0x0.8p0;
 			else if (x==i/2 && d+1==z) small=0x1.0p0;
 			else small=0x1.8p0;