1 files changed, 61 insertions, 0 deletions
diff --git a/test/arc-infinite-loop.c b/test/arc-infinite-loop.c
new file mode 100644
index 000000000..8b469eacf
--- /dev/null
+++ b/test/arc-infinite-loop.c
@@ -0,0 +1,61 @@
+/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
+/*
+ * Copyright 2010 Andrea Canciani
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Author: Andrea Canciani <ranma42@gmail.com>
+ */
+
+#include "cairo-test.h"
+#include <float.h>
+
+#define SIZE 8
+
+/*
+  cairo_arc can hang in an infinite loop if given huge (so big that
+  adding/subtracting 4*M_PI to them doesn't change the value because
+  of floating point rounding).
+
+  The purpose of this test is to check that cairo doesn't hang or crash.
+*/
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_set_source_rgb (cr, 1, 1, 1);
+    cairo_paint (cr);
+
+    /* Check if the code that guarantees start <= end hangs */
+    cairo_arc (cr, 0, 0, 1, 1024 / DBL_EPSILON * M_PI, 0);
+
+    /* Check if the code that handles huge angles hangs */
+    cairo_arc (cr, 0, 0, 1, 0, 1024 / DBL_EPSILON * M_PI);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (arc_infinite_loop,
+	    "Test cairo_arc with huge angles",
+	    "arc", /* keywords */
+	    NULL, /* requirements */
+	    SIZE, SIZE,
+	    NULL, draw)