From: Guido van Rossum <guido@python.org>
Date: Tue, 4 Nov 1997 17:12:33 +0000 (+0000)
Subject: Fix due to Bill Noon for problem discovered by Ken Manheimer: packing
X-Git-Tag: v1.5b1~130
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=8f3c812e22d1fc2a70c1f1c2b56262553e8d9c34;p=python

Fix due to Bill Noon for problem discovered by Ken Manheimer: packing
0.0 as float or double would yield the representation for 1.0!
---

diff --git a/Modules/structmodule.c b/Modules/structmodule.c
index 4b01f4bc2d..9b39919812 100644
--- a/Modules/structmodule.c
+++ b/Modules/structmodule.c
@@ -167,7 +167,7 @@ pack_float(x, p, incr)
 		f = ldexp(f, 126 + e);
 		e = 0;
 	}
-	else {
+	else if (!(e == 0 && f == 0.0)) {
 		e += 127;
 		f -= 1.0; /* Get rid of leading 1 */
 	}
@@ -239,7 +239,7 @@ pack_double(x, p, incr)
 		f = ldexp(f, 1022 + e);
 		e = 0;
 	}
-	else {
+	else if (!(e == 0 && f == 0.0)) {
 		e += 1023;
 		f -= 1.0; /* Get rid of leading 1 */
 	}