Import from old repository commit 61ef2b42a9c4ba8e1600f15bb0236765edc2ad45.

lib/shash.c

@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2009 Nicira Networks.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <config.h>
+#include "shash.h"
+#include <assert.h>
+#include "hash.h"
+
+static size_t
+hash_name(const char *name)
+{
+    return hash_string(name, 0);
+}
+
+void
+shash_init(struct shash *sh)
+{
+    hmap_init(&sh->map);
+}
+
+void
+shash_destroy(struct shash *sh)
+{
+    if (sh) {
+        shash_clear(sh);
+    }
+}
+
+void
+shash_clear(struct shash *sh)
+{
+    struct shash_node *node, *next;
+
+    HMAP_FOR_EACH_SAFE (node, next, struct shash_node, node, &sh->map) {
+        hmap_remove(&sh->map, &node->node);
+        free(node->name);
+        free(node);
+    }
+}
+
+/* It is the caller's responsible to avoid duplicate names, if that is
+ * desirable. */
+void
+shash_add(struct shash *sh, const char *name, void *data)
+{
+    struct shash_node *node = xmalloc(sizeof *node);
+    node->name = xstrdup(name);
+    node->data = data;
+    hmap_insert(&sh->map, &node->node, hash_name(name));
+}
+
+void
+shash_delete(struct shash *sh, struct shash_node *node)
+{
+    hmap_remove(&sh->map, &node->node);
+    free(node->name);
+    free(node);
+}
+
+/* If there are duplicates, returns a random element. */
+struct shash_node *
+shash_find(const struct shash *sh, const char *name)
+{
+    struct shash_node *node;
+
+    HMAP_FOR_EACH_WITH_HASH (node, struct shash_node, node,
+                             hash_name(name), &sh->map) {
+        if (!strcmp(node->name, name)) {
+            return node;
+        }
+    }
+    return NULL;
+}
+
+void *
+shash_find_data(const struct shash *sh, const char *name)
+{
+    struct shash_node *node = shash_find(sh, name);
+    return node ? node->data : NULL;
+}