From: gloit042 <gloit042@gmail.com>
Date: Sun, 20 Dec 2020 16:35:21 +0000 (+0800)
Subject: num2str: fix precision loss bug when the fractional part is close to 1
X-Git-Tag: fio-3.26~66^2
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=c736b361190e1133b4d407a6c7615bf8c4d9c262;p=fio.git

num2str: fix precision loss bug when the fractional part is close to 1

example:
	The result of num2str(11999999999999, 4, 1, 0, N2S_NONE) should
	be "12.0G", but current result is "11.0G".

Signed-off-by: Jiahao Li <gloit042@gmail.com>
---

diff --git a/lib/num2str.c b/lib/num2str.c
index 726f1c44..423d97b2 100644
--- a/lib/num2str.c
+++ b/lib/num2str.c
@@ -112,6 +112,9 @@ done:
 	sprintf(tmp, "%.*f", (int)(maxlen - strlen(tmp) - 1),
 		(double)modulo / (double)thousand);
 
+	if (tmp[0] == '1')
+		num++;
+
 	if (asprintf(&buf, "%llu.%s%s%s", (unsigned long long) num, &tmp[2],
 		     unitprefix[post_index], unitstr[units]) < 0)
 		buf = NULL;