alow a plugin to require other plugin

lib/handle.c

@@ -70,6 +70,12 @@ static const char* S_511 =  "Network Authentication Required";
 static const char* S_UNOF =  "Unofficial Status";
 
 
+int require_plugin(const char* name)
+{
+	UNUSED(name);
+	return 0;
+}
+
 const char* get_status_str(int stat)
 {
 	switch(stat)

lib/handle.h

@@ -101,6 +101,10 @@ typedef struct  {
     int raw_body;
 } plugin_header_t;
 
+
+int __attribute__((weak)) require_plugin(const char*);
+
+
 void set_nonblock(int socket);
 //void set_block(int socket);
 

plugin_manager.c

@@ -18,6 +18,12 @@ struct plugin_entry *plugin_lookup(char *s)
     return NULL; /* not found */
 }
 
+int require_plugin(const char* name)
+{
+	struct plugin_entry* ptr = plugin_load((char*)name);
+	return ptr != NULL;
+}
+
 /**
  * Load a plugin to the plugin table
  * Only load when not available in the plugin table