/*
 * Copyright (c) 1996
 *	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.
 */

/* @(#) $Header: /afs/sipb/project/tcpdump/repository/bpf/setbpfilter/util.c,v 1.1.1.1 1996/12/16 07:37:31 jhawk Exp $ (LBL) */

#include <sys/types.h>
#include <sys/file.h>
#include <sys/stat.h>

#include <errno.h>
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_MALLOC_H
#include <malloc.h>
#endif
#include <pcap.h>
#include <stdio.h>
#include <stdlib.h>
#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#include <unistd.h>

#include "interface.h"

/* VARARGS */
__dead void
#if __STDC__
error(const char *fmt, ...)
#else
error(fmt, va_alist)
	const char *fmt;
	va_dcl
#endif
{
	va_list ap;

	(void)fprintf(stderr, "%s: ", program_name);
#if __STDC__
	va_start(ap, fmt);
#else
	va_start(ap);
#endif
	(void)vfprintf(stderr, fmt, ap);
	va_end(ap);
	if (*fmt) {
		fmt += strlen(fmt);
		if (fmt[-1] != '\n')
			(void)fputc('\n', stderr);
	}
	exit(1);
	/* NOTREACHED */
}

/*
 * Copy arg vector into a new buffer, concatenating arguments with spaces.
 */
char *
copy_argv(register char **argv)
{
	register char **p;
	register u_int len = 0;
	char *buf;
	char *src, *dst;

	p = argv;
	if (*p == 0)
		return 0;

	while (*p)
		len += strlen(*p++) + 1;

	buf = (char *)malloc(len);
	if (buf == NULL)
		error("copy_argv: malloc");

	p = argv;
	dst = buf;
	while ((src = *p++) != NULL) {
		while ((*dst++ = *src++) != '\0')
			;
		dst[-1] = ' ';
	}
	dst[-1] = '\0';

	return buf;
}

char *
read_infile(char *fname)
{
	register int fd, cc;
	register char *cp;
	struct stat buf;

	fd = open(fname, O_RDONLY);
	if (fd < 0)
		error("can't open %s: %s", fname, pcap_strerror(errno));

	if (fstat(fd, &buf) < 0)
		error("can't stat %s: %s", fname, pcap_strerror(errno));

	cp = malloc((u_int)buf.st_size + 1);
	cc = read(fd, cp, (int)buf.st_size);
	if (cc < 0)
		error("read %s: %s", fname, pcap_strerror(errno));
	if (cc != buf.st_size)
		error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
	cp[(int)buf.st_size] = '\0';

	return (cp);
}