From: Guido van Rossum <guido@python.org>
Date: Thu, 2 Jan 1997 22:31:07 +0000 (+0000)
Subject: Oops -- unpack float/double didn't do the right thing if e==0.
X-Git-Tag: v1.5a1~617
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=07ef655222e4db5ad4e5fff68b35d05e4ff713a2;p=python

Oops -- unpack float/double didn't do the right thing if e==0.
---

diff --git a/Modules/structmodule.c b/Modules/structmodule.c
index 23b820bd6f..ef139122d5 100644
--- a/Modules/structmodule.c
+++ b/Modules/structmodule.c
@@ -402,8 +402,13 @@ unpack_float(p, incr)
 	x = (double)f / 8388608.0;
 
 	/* XXX This sadly ignores Inf/NaN issues */
-	if (e != 0)
-		x = ldexp(1.0 + x, e - 127);
+	if (e == 0)
+		e = -126;
+	else {
+		x += 1.0;
+		e -= 127;
+	}
+	x = ldexp(x, e);
 
 	if (s)
 		x = -x;
@@ -459,8 +464,13 @@ unpack_double(p, incr)
 	x /= 268435456.0; /* 2**28 */
 
 	/* XXX This sadly ignores Inf/NaN */
-	if (e != 0)
-		x = ldexp(1.0 + x, e - 1023);
+	if (e == 0)
+		e = -1022;
+	else {
+		x += 1.0;
+		e -= 1023;
+	}
+	x = ldexp(x, e);
 
 	if (s)
 		x = -x;