acinclude.m4: Reorganize checks for kernel identifiers.

[sliver-openvswitch.git] / lib / shash.c

diff --git a/lib/shash.c b/lib/shash.c
index da33fe8..caac460 100644 (file)
--- a/lib/shash.c
+++ b/lib/shash.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009 Nicira Networks.
+ * Copyright (c) 2009, 2010 Nicira Networks.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -40,6 +40,18 @@ shash_destroy(struct shash *sh)
     }
 }
 
+void
+shash_swap(struct shash *a, struct shash *b)
+{
+    hmap_swap(&a->map, &b->map);
+}
+
+void
+shash_moved(struct shash *sh)
+{
+    hmap_moved(&sh->map);
+}
+
 void
 shash_clear(struct shash *sh)
 {
@@ -58,18 +70,42 @@ shash_is_empty(const struct shash *shash)
     return hmap_is_empty(&shash->map);
 }
 
+size_t
+shash_count(const struct shash *shash)
+{
+    return hmap_count(&shash->map);
+}
+
 /* It is the caller's responsibility to avoid duplicate names, if that is
  * desirable. */
 struct shash_node *
-shash_add(struct shash *sh, const char *name, void *data)
+shash_add(struct shash *sh, const char *name, const void *data)
 {
     struct shash_node *node = xmalloc(sizeof *node);
     node->name = xstrdup(name);
-    node->data = data;
+    node->data = (void *) data;
     hmap_insert(&sh->map, &node->node, hash_name(name));
     return node;
 }
 
+bool
+shash_add_once(struct shash *sh, const char *name, const void *data)
+{
+    if (!shash_find(sh, name)) {
+        shash_add(sh, name, data);
+        return true;
+    } else {
+        return false;
+    }
+}
+
+void
+shash_add_assert(struct shash *sh, const char *name, const void *data)
+{
+    bool added OVS_UNUSED = shash_add_once(sh, name, data);
+    assert(added);
+}
+
 void
 shash_delete(struct shash *sh, struct shash_node *node)
 {
@@ -100,6 +136,27 @@ shash_find_data(const struct shash *sh, const char *name)
     return node ? node->data : NULL;
 }
 
+void *
+shash_find_and_delete(struct shash *sh, const char *name)
+{
+    struct shash_node *node = shash_find(sh, name);
+    if (node) {
+        void *data = node->data;
+        shash_delete(sh, node);
+        return data;
+    } else {
+        return NULL;
+    }
+}
+
+void *
+shash_find_and_delete_assert(struct shash *sh, const char *name)
+{
+    void *data = shash_find_and_delete(sh, name);
+    assert(data != NULL);
+    return data;
+}
+
 struct shash_node *
 shash_first(const struct shash *shash)
 {
@@ -107,3 +164,52 @@ shash_first(const struct shash *shash)
     return node ? CONTAINER_OF(node, struct shash_node, node) : NULL;
 }
 
+static int
+compare_nodes_by_name(const void *a_, const void *b_)
+{
+    const struct shash_node *const *a = a_;
+    const struct shash_node *const *b = b_;
+    return strcmp((*a)->name, (*b)->name);
+}
+
+const struct shash_node **
+shash_sort(const struct shash *sh)
+{
+    if (shash_is_empty(sh)) {
+        return NULL;
+    } else {
+        const struct shash_node **nodes;
+        struct shash_node *node;
+        size_t i, n;
+
+        n = shash_count(sh);
+        nodes = xmalloc(n * sizeof *nodes);
+        i = 0;
+        SHASH_FOR_EACH (node, sh) {
+            nodes[i++] = node;
+        }
+        assert(i == n);
+
+        qsort(nodes, n, sizeof *nodes, compare_nodes_by_name);
+
+        return nodes;
+    }
+}
+
+/* Returns true if 'a' and 'b' contain the same keys (regardless of their
+ * values), false otherwise. */
+bool
+shash_equal_keys(const struct shash *a, const struct shash *b)
+{
+    struct shash_node *node;
+
+    if (hmap_count(&a->map) != hmap_count(&b->map)) {
+        return false;
+    }
+    SHASH_FOR_EACH (node, a) {
+        if (!shash_find(b, node->name)) {
+            return false;
+        }
+    }
+    return true;
+}