read.c

实用的程序代码

/* read.c -- read bytes from a input device.
 */

extern char inbyte(void);

/*
 * read  -- read bytes from the serial port. Ignore fd, since
 *          we only have stdin.
 */
int
read (fd, buf, nbytes)
       int fd;
       char *buf;
       int nbytes;
{
  int i = 0;

  for (i = 0; i < nbytes; i++) {
    *(buf + i) = inbyte();
    if ((*(buf + i) == '\n') || (*(buf + i) == '\r')) {
      (*(buf + i + 1)) = 0;
      break;
    }
  }
  return (i);
}