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/* $NetBSD: etherent.c,v 1.2 1995/03/06 11:38:14 mycroft Exp $ */
/*
* Copyright (c) 1990, 1993, 1994
* 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 char rcsid[] =
"@(#) Header: etherent.c,v 1.8 94/06/20 19:07:50 leres Exp (LBL)";
#endif
#include <sys/types.h>
#include <ctype.h>
#include <pcap.h>
#include <pcap-namedb.h>
#include <stdio.h>
#ifndef __GNUC__
#define inline
#endif
static inline int xdtoi(int);
static inline int skip_space(FILE *);
static inline int skip_line(FILE *);
/* Hex digit to integer. */
static inline int
xdtoi(c)
register int c;
{
if (isdigit(c))
return c - '0';
else if (islower(c))
return c - 'a' + 10;
else
return c - 'A' + 10;
}
static inline int
skip_space(f)
FILE *f;
{
int c;
do {
c = getc(f);
} while (isspace(c) && c != '\n');
return c;
}
static inline int
skip_line(f)
FILE *f;
{
int c;
do
c = getc(f);
while (c != '\n' && c != EOF);
return c;
}
struct pcap_etherent *
pcap_next_etherent(FILE *fp)
{
register int c, d, i;
char *bp;
static struct pcap_etherent e;
static int nline = 1;
top:
while (nline) {
/* Find addr */
c = skip_space(fp);
if (c == '\n')
continue;
/* If this is a comment, or first thing on line
cannot be ethernet address, skip the line. */
else if (!isxdigit(c))
c = skip_line(fp);
else {
/* must be the start of an address */
for (i = 0; i < 6; i += 1) {
d = xdtoi(c);
c = getc(fp);
if (c != ':') {
d <<= 4;
d |= xdtoi(c);
c = getc(fp);
}
e.addr[i] = d;
if (c != ':')
break;
c = getc(fp);
}
nline = 0;
}
if (c == EOF)
return 0;
}
/* If we started a new line, 'c' holds the char past the ether addr,
which we assume is white space. If we are continuing a line,
'c' is garbage. In either case, we can throw it away. */
c = skip_space(fp);
if (c == '\n') {
nline = 1;
goto top;
}
else if (c == '#') {
(void)skip_line(fp);
nline = 1;
goto top;
}
else if (c == EOF)
return 0;
/* Must be a name. */
bp = e.name;
/* Use 'd' to prevent buffer overflow. */
d = sizeof(e.name) - 1;
do {
*bp++ = c;
c = getc(fp);
} while (!isspace(c) && c != EOF && --d > 0);
*bp = '\0';
if (c == '\n')
nline = 1;
return &e;
}
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