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31 lines
1.1 KiB
Diff
31 lines
1.1 KiB
Diff
From 51ab6db4ed115d079d7131975e4adb074ba9ef9d Mon Sep 17 00:00:00 2001
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From: Szabolcs Nagy <nsz@port70.net>
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Date: Wed, 12 Oct 2016 00:49:59 +0200
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Subject: fix float formatting of some exact halfway cases
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in nearest rounding mode exact halfway cases were not following the
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round to even rule if the rounding happened at a base 1000000000 digit
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boundary of the internal representation and the previous digit was odd.
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e.g. printf("%.0f", 1.5) printed 1 instead of 2.
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---
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src/stdio/vfprintf.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/src/stdio/vfprintf.c b/src/stdio/vfprintf.c
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index e2ab2dc..60da14d 100644
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--- a/src/stdio/vfprintf.c
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+++ b/src/stdio/vfprintf.c
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@@ -345,7 +345,8 @@ static int fmt_fp(FILE *f, long double y, int w, int p, int fl, int t)
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if (x || d+1!=z) {
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long double round = 2/LDBL_EPSILON;
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long double small;
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- if (*d/i & 1) round += 2;
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+ if ((*d/i & 1) || (i==1000000000 && d>a && (d[-1]&1)))
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+ round += 2;
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if (x<i/2) small=0x0.8p0;
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else if (x==i/2 && d+1==z) small=0x1.0p0;
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else small=0x1.8p0;
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--
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cgit v0.11.2
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