print-beep.c

来自「TCPDUMP的C语言源代码,是在数据链路层的应用」· C语言 代码 · 共 72 行

/*
 * Copyright (C) 2000, Richard Sharpe
 *
 * This software may be distributed either under the terms of the
 * BSD-style licence that accompanies tcpdump or under the GNU GPL
 * version 2 or later.
 *
 * print-beep.c
 *
 */

#ifndef lint
static const char rcsid[] _U_ =
  "@(#) $Header: /tcpdump/master/tcpdump/print-beep.c,v 1.6 2003-11-16 09:36:13 guy Exp $";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <tcpdump-stdinc.h>

#ifdef HAVE_MEMORY_H
#include <memory.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "interface.h"
#include "extract.h"

/* Check for a string but not go beyond length
 * Return TRUE on match, FALSE otherwise
 *
 * Looks at the first few chars up to tl1 ...
 */

static int l_strnstart(const char *, u_int, const char *, u_int);

static int
l_strnstart(const char *tstr1, u_int tl1, const char *str2, u_int l2)
{

	if (tl1 > l2)
		return 0;

	return (strncmp(tstr1, str2, tl1) == 0 ? 1 : 0);
}

void
beep_print(const u_char *bp, u_int length)
{

	if (l_strnstart("MSG", 4, (const char *)bp, length)) /* A REQuest */
		printf(" BEEP MSG");
	else if (l_strnstart("RPY ", 4, (const char *)bp, length))
		printf(" BEEP RPY");
	else if (l_strnstart("ERR ", 4, (const char *)bp, length))
		printf(" BEEP ERR");
	else if (l_strnstart("ANS ", 4, (const char *)bp, length))
		printf(" BEEP ANS");
	else if (l_strnstart("NUL ", 4, (const char *)bp, length))
		printf(" BEEP NUL");
	else if (l_strnstart("SEQ ", 4, (const char *)bp, length))
		printf(" BEEP SEQ");
	else if (l_strnstart("END", 4, (const char *)bp, length))
		printf(" BEEP END");
	else
		printf(" BEEP (payload or undecoded)");
}