write.c

实用的程序代码

/* write.c -- write bytes to an output device.
 */

extern int  outbyte(char);

/*
 * write -- write bytes to the serial port. Ignore fd, since
 *          stdout and stderr are the same. Since we have no filesystem,
 *          open will only return an error.
 */
int
write (fd, buf, nbytes)
       int fd;
       char *buf;
       int nbytes;
{
  int i;

  for (i = 0; i < nbytes; i++) {
    if (*(buf + i) == '\n') {
      outbyte ('\r');
    }
    outbyte (*(buf + i));
  }
  return (nbytes);
}