#include <assert.h>
#include "hash.h"
+static struct shash_node *shash_find__(const struct shash *,
+ const char *name, size_t hash);
+
static size_t
hash_name(const char *name)
{
}
}
+/* Like shash_destroy(), but also free() each node's 'data'. */
+void
+shash_destroy_free_data(struct shash *sh)
+{
+ if (sh) {
+ shash_clear_free_data(sh);
+ hmap_destroy(&sh->map);
+ }
+}
+
void
shash_swap(struct shash *a, struct shash *b)
{
}
}
+/* Like shash_clear(), but also free() each node's 'data'. */
+void
+shash_clear_free_data(struct shash *sh)
+{
+ struct shash_node *node, *next;
+
+ SHASH_FOR_EACH_SAFE (node, next, sh) {
+ hmap_remove(&sh->map, &node->node);
+ free(node->data);
+ free(node->name);
+ free(node);
+ }
+}
+
bool
shash_is_empty(const struct shash *shash)
{
return hmap_count(&shash->map);
}
+static struct shash_node *
+shash_add_nocopy__(struct shash *sh, char *name, const void *data, size_t hash)
+{
+ struct shash_node *node = xmalloc(sizeof *node);
+ node->name = name;
+ node->data = (void *) data;
+ hmap_insert(&sh->map, &node->node, hash);
+ return node;
+}
+
+/* It is the caller's responsibility to avoid duplicate names, if that is
+ * desirable. */
+struct shash_node *
+shash_add_nocopy(struct shash *sh, char *name, const void *data)
+{
+ return shash_add_nocopy__(sh, name, data, hash_name(name));
+}
+
/* 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, const void *data)
{
- struct shash_node *node = xmalloc(sizeof *node);
- node->name = xstrdup(name);
- node->data = (void *) data;
- hmap_insert(&sh->map, &node->node, hash_name(name));
- return node;
+ return shash_add_nocopy(sh, xstrdup(name), data);
}
bool
assert(added);
}
+/* Searches for 'name' in 'sh'. If it does not already exist, adds it along
+ * with 'data' and returns NULL. If it does already exist, replaces its data
+ * by 'data' and returns the data that it formerly contained. */
+void *
+shash_replace(struct shash *sh, const char *name, const void *data)
+{
+ size_t hash = hash_name(name);
+ struct shash_node *node;
+
+ node = shash_find__(sh, name, hash);
+ if (!node) {
+ shash_add_nocopy__(sh, xstrdup(name), data, hash);
+ return NULL;
+ } else {
+ void *old_data = node->data;
+ node->data = (void *) data;
+ return old_data;
+ }
+}
+
+/* Deletes 'node' from 'sh' and frees the node's name. The caller is still
+ * responsible for freeing the node's data, if necessary. */
void
shash_delete(struct shash *sh, struct shash_node *node)
{
+ free(shash_steal(sh, node));
+}
+
+/* Deletes 'node' from 'sh'. Neither the node's name nor its data is freed;
+ * instead, ownership is transferred to the caller. Returns the node's
+ * name. */
+char *
+shash_steal(struct shash *sh, struct shash_node *node)
+{
+ char *name = node->name;
+
hmap_remove(&sh->map, &node->node);
- free(node->name);
free(node);
+ return name;
}
-/* If there are duplicates, returns a random element. */
-struct shash_node *
-shash_find(const struct shash *sh, const char *name)
+static struct shash_node *
+shash_find__(const struct shash *sh, const char *name, size_t hash)
{
struct shash_node *node;
- HMAP_FOR_EACH_WITH_HASH (node, struct shash_node, node,
- hash_name(name), &sh->map) {
+ HMAP_FOR_EACH_WITH_HASH (node, node, hash, &sh->map) {
if (!strcmp(node->name, name)) {
return node;
}
return NULL;
}
+/* If there are duplicates, returns a random element. */
+struct shash_node *
+shash_find(const struct shash *sh, const char *name)
+{
+ return shash_find__(sh, name, hash_name(name));
+}
+
void *
shash_find_data(const struct shash *sh, const char *name)
{
}
return true;
}
+
+/* Chooses and returns a randomly selected node from 'sh', which must not be
+ * empty.
+ *
+ * I wouldn't depend on this algorithm to be fair, since I haven't analyzed it.
+ * But it does at least ensure that any node in 'sh' can be chosen. */
+struct shash_node *
+shash_random_node(struct shash *sh)
+{
+ return CONTAINER_OF(hmap_random_node(&sh->map), struct shash_node, node);
+}
+\f
+/* String-to-string maps (smaps). */
+
+/* Frees 'smap', including its keys and string values. */
+void
+smap_destroy(struct shash *smap)
+{
+ shash_destroy_free_data(smap);
+}
+
+/* Returns true if string-to-string maps 'a' and 'b' contain the same keys and
+ * values, false otherwise. */
+bool
+smap_equal(const struct shash *a, const struct shash *b)
+{
+ struct shash_node *a_node;
+
+ if (shash_count(a) != shash_count(b)) {
+ return false;
+ }
+
+ SHASH_FOR_EACH (a_node, a) {
+ uint32_t hash = a_node->node.hash;
+ struct shash_node *b_node = shash_find__(b, a_node->name, hash);
+ if (!b_node || strcmp(a_node->data, b_node->data)) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+/* Initializes 'dst' as a clone of 'src'. */
+void
+smap_clone(struct shash *dst, const struct shash *src)
+{
+ struct shash_node *node;
+
+ shash_init(dst);
+ SHASH_FOR_EACH (node, src) {
+ shash_add_nocopy__(dst, xstrdup(node->name), xstrdup(node->data),
+ node->node.hash);
+ }
+}
+
+/* Adds 'key' with string 'value' to 'smap', making a copy of each.
+ *
+ * It is the caller's responsibility to avoid duplicate names, if that is
+ * desirable. */
+void
+smap_add(struct shash *smap, const char *key, const char *value)
+{
+ shash_add(smap, key, xstrdup(value));
+}
git://git.onelab.eu / sliver-openvswitch.git / blobdiff