23 err(int eval, const char *fmt, ...)  in err()  argument
28 	va_start(ap, fmt);  in err()
29 	if (fmt != NULL) {  in err()
30 		vfprintf(stderr, fmt, ap);  in err()
44 errx(int eval, const char *fmt, ...)  in errx()  argument
48 	va_start(ap, fmt);  in errx()
49 	if (fmt != NULL)  in errx()
50 		vfprintf(stderr, fmt, ap);  in errx()
57 warn(const char *fmt, ...)  in warn()  argument
62 	va_start(ap, fmt);  in warn()
63 	if (fmt != NULL) {  in warn()
64 		vfprintf(stderr, fmt, ap);  in warn()
72 warnx(const char *fmt, ...)  in warnx()  argument
76 	va_start(ap, fmt);  in warnx()
77 	if (fmt != NULL)  in warnx()
78 		vfprintf(stderr, fmt, ap);  in warnx()