Patch #453627: Define the following macros when compiling on a UnixWare 7.x system:
SCO_ATAN2_BUG, SCO_ACCEPT_BUG, and STRICT_SYSV_CURSES.
Work aroudn a bug in the SCO UnixWare atan2() implementation.
diff --git a/Objects/complexobject.c b/Objects/complexobject.c
index 7404993..dde6449 100644
--- a/Objects/complexobject.c
+++ b/Objects/complexobject.c
@@ -26,6 +26,22 @@
#define PREC_REPR 17
#define PREC_STR 12
+#ifdef SCO_ATAN2_BUG
+/*
+ * UnixWare 7+ is known to have a bug in atan2 that will return PI instead
+ * of ZERO (0) if the first argument is ZERO(0).
+ */
+static double atan2_sco(double x, double y)
+{
+ if (x == 0.0)
+ return (double)0.0;
+ return atan2(x, y);
+}
+#define ATAN2 atan2_sco
+#else
+#define ATAN2 atan2
+#endif
+
/* elementary operations on complex numbers */
static Py_complex c_1 = {1., 0.};
@@ -138,7 +154,7 @@
else {
vabs = hypot(a.real,a.imag);
len = pow(vabs,b.real);
- at = atan2(a.imag, a.real);
+ at = ATAN2(a.imag, a.real);
phase = at*b.real;
if (b.imag != 0.0) {
len /= exp(at*b.imag);