[BZ #2766]

2006-06-14  Jakub Jelinek  <jakub@redhat.com>
	[BZ #2766]
	* misc/insremque.c (insque): Handle prev == NULL.
	* misc/Makefile (tests): Add tst-insremque.
	* misc/tst-insremque.c: New test.

1 files changed, 61 insertions, 0 deletions

diff --git a/misc/tst-insremque.c b/misc/tst-insremque.c
new file mode 100644
index 0000000000..9f17055ef5
--- /dev/null
+++ b/misc/tst-insremque.c
@@ -0,0 +1,61 @@
+#include <search.h>
+#include <stdio.h>
+#include <string.h>
+
+#define CHECK(cond) \
+  do									\
+    if (! (cond))							\
+      {									\
+	printf ("Condition " #cond " not true on line %d\n", __LINE__);	\
+	ret = 1;							\
+      }									\
+  while (0)
+
+static int
+do_test (void)
+{
+  struct qelem elements[4];
+  int ret = 0;
+
+  /* Linear list.  */
+  memset (elements, 0xff, sizeof (elements));
+  insque (&elements[0], NULL);
+  remque (&elements[0]);
+  insque (&elements[0], NULL);
+  insque (&elements[2], &elements[0]);
+  insque (&elements[1], &elements[0]);
+  insque (&elements[3], &elements[2]);
+  remque (&elements[2]);
+  insque (&elements[2], &elements[0]);
+  CHECK (elements[0].q_back == NULL);
+  CHECK (elements[0].q_forw == &elements[2]);
+  CHECK (elements[1].q_back == &elements[2]);
+  CHECK (elements[1].q_forw == &elements[3]);
+  CHECK (elements[2].q_back == &elements[0]);
+  CHECK (elements[2].q_forw == &elements[1]);
+  CHECK (elements[3].q_back == &elements[1]);
+  CHECK (elements[3].q_forw == NULL);
+
+  /* Circular list.  */
+  memset (elements, 0xff, sizeof (elements));
+  elements[0].q_back = &elements[0];
+  elements[0].q_forw = &elements[0];
+  insque (&elements[2], &elements[0]);
+  insque (&elements[1], &elements[0]);
+  insque (&elements[3], &elements[2]);
+  remque (&elements[2]);
+  insque (&elements[2], &elements[0]);
+  CHECK (elements[0].q_back == &elements[3]);
+  CHECK (elements[0].q_forw == &elements[2]);
+  CHECK (elements[1].q_back == &elements[2]);
+  CHECK (elements[1].q_forw == &elements[3]);
+  CHECK (elements[2].q_back == &elements[0]);
+  CHECK (elements[2].q_forw == &elements[1]);
+  CHECK (elements[3].q_back == &elements[1]);
+  CHECK (elements[3].q_forw == &elements[0]);
+
+  return ret;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"