#define ERRCODE	7	/* op sys return code */

cout(c, fd) char c; int fd; {
  if(fputc(c, fd)==EOF) xout();
  }

sout(string, fd) char *string; int fd; {
  if(fputs(string, fd)==EOF) xout();
  }

lout(line, fd) char *line; int fd; {
  sout(line, fd);
  cout('\n', fd);
  }

xout() {
  fputs("output error\n", stderr);
  abort(ERRCODE);
  }