Add support for XEP-0203: Delayed delivery (message timestamps)

Very similar to XEP-0091 which is already supported, but was marked as
obsolete, replaced by XEP-0203. The main differences are the tag name
and the timestamp format.

Due to the similarities, both XEPs are still supported.

2 files changed, 16 insertions, 0 deletions

diff --git a/lib/xmltree.c b/lib/xmltree.c
index 0726d387..9d84fb7c 100644
--- a/lib/xmltree.c
+++ b/lib/xmltree.c
@@ -523,6 +523,21 @@ char *xt_find_attr( struct xt_node *node, const char *key )
 	return node->attr[i].value;
 }
 
+struct xt_node *xt_find_node_by_attr( struct xt_node *xt, const char *tag, const char *key, const char *value ) {
+	struct xt_node *c;
+	char *s;
+
+	for( c = xt; ( c = xt_find_node( c, tag ) ); c = c->next )
+	{
+		if( ( s = xt_find_attr( c, key ) ) && strcmp( s, value ) == 0 )
+		{
+			return c;
+		}
+	}
+	return NULL;
+}
+
+
 /* Strip a few non-printable characters that aren't allowed in XML streams
    (and upset some XMPP servers for example). */
 void xt_strip_text( char *in )
diff --git a/lib/xmltree.h b/lib/xmltree.h
index a41cbac1..aaf49cea 100644
--- a/lib/xmltree.h
+++ b/lib/xmltree.h
@@ -91,6 +91,7 @@ void xt_free( struct xt_parser *xt );
 struct xt_node *xt_find_node( struct xt_node *node, const char *name );
 struct xt_node *xt_find_path( struct xt_node *node, const char *name );
 char *xt_find_attr( struct xt_node *node, const char *key );
+struct xt_node *xt_find_node_by_attr( struct xt_node *xt, const char *tag, const char *key, const char *value );
 
 struct xt_node *xt_new_node( char *name, const char *text, struct xt_node *children );
 void xt_add_child( struct xt_node *parent, struct xt_node *child );