src/sn_{network,stage}.[ch]: Implement sn_{network,stage}_compare.

[sort-networks.git] / src / sn_stage.c

diff --git a/src/sn_stage.c b/src/sn_stage.c
index d0d54d7..1584469 100644 (file)
--- a/src/sn_stage.c
+++ b/src/sn_stage.c
@@ -320,6 +320,24 @@ int sn_stage_shift (sn_stage_t *s, int sw, int inputs_num)
   return (0);
 } /* int sn_stage_shift */
 
+static int sn_stage_unify__qsort_callback (const void *p0, const void *p1) /* {{{ */
+{
+  return (sn_comparator_compare (p0, p1));
+} /* }}} int sn_stage_unify__qsort_callback */
+
+int sn_stage_unify (sn_stage_t *s) /* {{{ */
+{
+  if (s == NULL)
+    return (EINVAL);
+
+  qsort (s->comparators,
+      (size_t) s->comparators_num,
+      sizeof (*s->comparators),
+      sn_stage_unify__qsort_callback);
+
+  return (0);
+} /* }}} int sn_stage_unify */
+
 int sn_stage_swap (sn_stage_t *s, int con0, int con1)
 {
   int i;
@@ -608,4 +626,47 @@ sn_stage_t *sn_stage_unserialize (char **ret_buffer, size_t *ret_buffer_size)
   return (s);
 } /* sn_stage_t *sn_stage_unserialize */
 
-/* vim: set shiftwidth=2 softtabstop=2 expandtab : */
+int sn_stage_compare (const sn_stage_t *s0, const sn_stage_t *s1) /* {{{ */
+{
+  int status;
+  int i;
+
+  if (s0 == s1)
+    return (0);
+  else if (s0 == NULL)
+    return (-1);
+  else if (s1 == NULL)
+    return (1);
+
+  if (s0->comparators_num < s1->comparators_num)
+    return (-1);
+  else if (s0->comparators_num > s1->comparators_num)
+    return (1);
+
+  for (i = 0; i < s0->comparators_num; i++)
+  {
+    status = sn_comparator_compare (s0->comparators + i, s1->comparators + i);
+    if (status != 0)
+      return (status);
+  }
+
+  return (0);
+} /* }}} int sn_stage_compare */
+
+uint64_t sn_stage_get_hashval (const sn_stage_t *s) /* {{{ */
+{
+  uint64_t hash;
+  int i;
+
+  if (s == NULL)
+    return (0);
+
+  hash = (uint64_t) s->depth;
+
+  for (i = 0; i < s->comparators_num; i++)
+    hash = (hash * 99991) + sn_comparator_get_hashval (s->comparators + i);
+
+  return (hash);
+} /* }}} uint64_t sn_stage_get_hashval */
+
+/* vim: set shiftwidth=2 softtabstop=2 expandtab fdm=marker : */