From 3158713e0094fd32f58ee80c50ff54210c2dc411 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Wed, 20 Jan 2010 02:12:12 +0100
Subject: [PATCH] implement hashmap_replace() and hashmap_remove_value()

---
 hashmap.c | 43 ++++++++++++++++++++++++++++++++++++++++++-
 hashmap.h |  2 ++
 2 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/hashmap.c b/hashmap.c
index c55a07a88..a81bcc422 100644
--- a/hashmap.c
+++ b/hashmap.c
@@ -139,8 +139,13 @@ int hashmap_put(Hashmap *h, const void *key, void *value) {
 
         hash = h->hash_func(key) % NBUCKETS;
 
-        if (hash_scan(h, hash, key))
+        if ((e = hash_scan(h, hash, key))) {
+
+                if (e->value == value)
+                        return 0;
+
                 return -EEXIST;
+        }
 
         if (!(e = new(struct hashmap_entry, 1)))
                 return -ENOMEM;
@@ -173,6 +178,22 @@ int hashmap_put(Hashmap *h, const void *key, void *value) {
         return 0;
 }
 
+int hashmap_replace(Hashmap *h, const void *key, void *value) {
+        struct hashmap_entry *e;
+        unsigned hash;
+
+        assert(h);
+
+        hash = h->hash_func(key) % NBUCKETS;
+
+        if ((e = hash_scan(h, hash, key))) {
+                e->value = value;
+                return 0;
+        }
+
+        return hashmap_put(h, key, value);
+}
+
 void* hashmap_get(Hashmap *h, const void *key) {
         unsigned hash;
         struct hashmap_entry *e;
@@ -207,6 +228,26 @@ void* hashmap_remove(Hashmap *h, const void *key) {
         return data;
 }
 
+void* hashmap_remove_value(Hashmap *h, const void *key, void *value) {
+        struct hashmap_entry *e;
+        unsigned hash;
+
+        if (!h)
+                return NULL;
+
+        hash = h->hash_func(key) % NBUCKETS;
+
+        if (!(e = hash_scan(h, hash, key)))
+                return NULL;
+
+        if (e->value != value)
+                return NULL;
+
+        remove_entry(h, e);
+
+        return value;
+}
+
 void *hashmap_iterate(Hashmap *h, void **state, const void **key) {
         struct hashmap_entry *e;
 
diff --git a/hashmap.h b/hashmap.h
index 91d8b46db..ae7f74bc0 100644
--- a/hashmap.h
+++ b/hashmap.h
@@ -26,8 +26,10 @@ void hashmap_free(Hashmap *h);
 Hashmap *hashmap_copy(Hashmap *h);
 
 int hashmap_put(Hashmap *h, const void *key, void *value);
+int hashmap_replace(Hashmap *h, const void *key, void *value);
 void* hashmap_get(Hashmap *h, const void *key);
 void* hashmap_remove(Hashmap *h, const void *key);
+void* hashmap_remove_value(Hashmap *h, const void *key, void *value);
 
 int hashmap_merge(Hashmap *h, Hashmap *other);
 
-- 
2.30.2