Miscellany

// take the command field in target_host and substitute away any string of type {key with}
// the actual value of the key if it is defined. if not defined, null will be placed
gboolean perform_cmd_substition(struct host* target_host, gchar** resultant_cmd, int var_len, ...) {
	GList *key_node = target_host->keys;
	gchar* s;
	gchar* key = NULL;
	gchar* value = NULL;
	gchar* ret = g_strdup(target_host->cmd);
	
	va_list ap;
	va_start(ap, var_len);
	while (var_len--) {
		gchar *temp;
		s = va_arg(ap, gchar *);
		key = str_unpack_key(s);
		value = str_unpack_value(s);
		if (key == NULL || value == NULL) {
			if (key) free(key);
			if (value) free(value);
			g_warning("perform_cmd_substition:malformed substition\n");
			continue;
		}		
		
		// case sensitive string replace
		temp = str_replace(ret, key, value);
		g_assert(temp != NULL);
		
		// dump the old return string and replace it with the replaced string
		free(ret);
		free(key);
		free(value);
		
		ret = temp;		
	}    	
	va_end(ap);