vfprintf.c

TCPDUMP的C语言源代码,是在数据链路层的应用

/*
 * Copyright (c) 1995
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/tcpdump/vfprintf.c,v 1.6 2003-11-16 09:36:45 guy Exp $ (LBL)";
#endif

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

#include <sys/types.h>

#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <unistd.h>

#include "interface.h"

/*
 * Stock 4.3 doesn't have vfprintf.
 * This routine is due to Chris Torek.
 */
vfprintf(f, fmt, args)
	FILE *f;
	char *fmt;
	va_list args;
{
	int ret;

	if ((f->_flag & _IOWRT) == 0) {
		if (f->_flag & _IORW)
			f->_flag |= _IOWRT;
		else
			return EOF;
	}
	ret = _doprnt(fmt, args, f);
	return ferror(f) ? EOF : ret;
}