lef               546 src/isdn/Q921.c #define APPEND_MSG(buf, off, lef, fmt, ...) 			\
lef               547 src/isdn/Q921.c 	len = snprintf(buf + off, lef, fmt, ##__VA_ARGS__);	\
lef               550 src/isdn/Q921.c 		lef -= len;					\