cxwrite
if (cxwrite(str->s_type.SF.s_fd, NULL, 0) == 0)
if (cxwrite(str->s_type.SF.s_fd, "\n", 1) < 0)
if (cxwrite(str->s_type.SF.s_fd, NULL, 0) < 0)
if (cxwrite(str->s_type.SF.s_fd, line->l_data.sp,
return (cxwrite(fd, NULL, 0));
return (cxwrite(fd, convert_buffer, req_bufsize));
extern int cxwrite(int, char *, size_t);