read.c

guide and some example with visualC++

/* read.c -- read bytes from a input device.
 * 
 * Copyright (c) 1995 Cygnus Support
 *
 * The authors hereby grant permission to use, copy, modify, distribute,
 * and license this software and its documentation for any purpose, provided
 * that existing copyright notices are retained in all copies and that this
 * notice is included verbatim in any distributions. No written agreement,
 * license, or royalty fee is required for any of the authorized uses.
 * Modifications to this software may be copyrighted by their authors
 * and need not follow the licensing terms described here, provided that
 * the new terms are clearly indicated on the first page of each file where
 * they apply.
 */
#include "glue.h"

extern char _DEFUN_VOID (inbyte);

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

  #ifdef debuglg
  prs("[read]\n");
  inbyte();
  #endif
  for (i = 0; i < nbytes; i++) {
    *(buf + i) = inbyte();
    if ((*(buf + i) == '\n') || (*(buf + i) == '\r')) {
      (*(buf + i + 1)) = 0;
      break;
    }
  }
  return (i);
}