rem: void rprintf(int fd, const char *format, ...)
add: void rprintf(enum logcode code, const char *format, ...)
context:  void rprintf(int fd, const char *format, ...){	va_list ap;  	char buf[1024];	int len;	va_start(ap, format);	len = vslprintf(buf, sizeof(buf), format, ap);	va_end(ap);	if (len > sizeof(buf)-1) exit_cleanup(RERR_MESSAGEIO);	rwrite(fd, buf, len);}