Implement xmpp_stanza_del_attribute()

src/stanza.c

@@ -1042,3 +1042,24 @@ char *xmpp_stanza_get_attribute(xmpp_stanza_t * const stanza,
 
     return hash_get(stanza->attributes, name);
 }
+
+/** Delete an attribute from a stanza.
+ *
+ *  @param stanza a Strophe stanza object
+ *  @param name a string containing attribute name
+ *
+ *  @return XMPP_EOK (0) on success or a number less than 0 on failure
+ *
+ *  @ingroup Stanza
+ */
+int xmpp_stanza_del_attribute(xmpp_stanza_t * const stanza,
+                              const char * const name)
+{
+    if (stanza->type != XMPP_STANZA_TAG)
+        return -1;
+
+    if (!stanza->attributes)
+        return -1;
+
+    return hash_drop(stanza->attributes, name);
+}

strophe.h

@@ -342,6 +342,9 @@ int xmpp_stanza_set_text_with_size(xmpp_stanza_t *stanza,
 				   const char * const text, 
 				   const size_t size);
 
+int xmpp_stanza_del_attribute(xmpp_stanza_t * const stanza,
+                              const char * const name);
+
 /* common stanza helpers */
 char *xmpp_stanza_get_type(xmpp_stanza_t * const stanza);
 char *xmpp_stanza_get_id(xmpp_stanza_t * const stanza);