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authorGuido van Rossum <guido@python.org>1991-12-16 15:43:14 (GMT)
committerGuido van Rossum <guido@python.org>1991-12-16 15:43:14 (GMT)
commit7fa52f84c7c5479b75c5a1e168a2edaf7072f9de (patch)
tree93caca101559c1c40336731e5c92a310538c2755
parentfb905c3ebfe71c619cf4a4cb8bf162beb3526db2 (diff)
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Explicitly check for weird values after calling pow().
-rw-r--r--Objects/floatobject.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/Objects/floatobject.c b/Objects/floatobject.c
index 77015b9..43cefda 100644
--- a/Objects/floatobject.c
+++ b/Objects/floatobject.c
@@ -37,6 +37,14 @@ extern int errno;
#include <ctype.h>
#include <math.h>
+#ifdef HUGE_VAL
+#define CHECK(x) if (errno != 0) ; \
+ else if (-HUGE_VAL <= (x) && (x) <= HUGE_VAL) ; \
+ else errno = ERANGE
+#else
+#define CHECK(x) /* Don't know how to check */
+#endif
+
#ifndef THINK_C
extern double fmod PROTO((double, double));
extern double pow PROTO((double, double));
@@ -262,6 +270,7 @@ float_pow(v, w)
}
errno = 0;
ix = pow(iv, iw);
+ CHECK(ix);
if (errno != 0) {
/* XXX could it be another type of error? */
err_errno(OverflowError);