521 # define CONVERT_TO_UTF8(String)				\  argument
522     ((output_conv.vc_type == CONV_NONE || (String) == NULL)	\
523 	    ? (String)						\
524 	    : string_convert(&output_conv, (String), NULL))
526 # define CONVERT_TO_UTF8_FREE(String)				\  argument
527     ((String) = ((output_conv.vc_type == CONV_NONE)		\
529 			: (vim_free(String), (char_u *)NULL)))
531 # define CONVERT_FROM_UTF8(String)				\  argument
532     ((input_conv.vc_type == CONV_NONE || (String) == NULL)	\
533 	    ? (String)						\
534 	    : string_convert(&input_conv, (String), NULL))
536 # define CONVERT_FROM_UTF8_FREE(String)				\  argument
537     ((String) = ((input_conv.vc_type == CONV_NONE)		\
539 			: (vim_free(String), (char_u *)NULL)))
542 # define CONVERT_TO_UTF8(String) (String)  argument
543 # define CONVERT_TO_UTF8_FREE(String) ((String) = (char_u *)NULL)  argument
544 # define CONVERT_FROM_UTF8(String) (String)  argument
545 # define CONVERT_FROM_UTF8_FREE(String) ((String) = (char_u *)NULL)  argument