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etherent.c

/*
 * Copyright (c) 1990, 1993, 1994, 1995, 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.
 */

#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header$ (LBL)";
#endif

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

#include <sys/types.h>

#include <ctype.h>
#include <memory.h>
#include <stdio.h>
#include <string.h>

#include "pcap-int.h"

#include <pcap-namedb.h>

#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#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;

      memset((char *)&e, 0, sizeof(e));
      do {
            /* Find addr */
            c = skip_space(fp);
            if (c == '\n')
                  continue;

            /* If this is a comment, or first thing on line
               cannot be etehrnet address, skip the line. */
            if (!isxdigit(c)) {
                  c = skip_line(fp);
                  continue;
            }

            /* must be the start of an address */
            for (i = 0; i < 6; i += 1) {
                  d = xdtoi(c);
                  c = getc(fp);
                  if (isxdigit(c)) {
                        d <<= 4;
                        d |= xdtoi(c);
                        c = getc(fp);
                  }
                  e.addr[i] = d;
                  if (c != ':')
                        break;
                  c = getc(fp);
            }
            if (c == EOF)
                  break;

            /* Must be whitespace */
            if (!isspace(c)) {
                  c = skip_line(fp);
                  continue;
            }
            c = skip_space(fp);

            /* hit end of line... */
            if (c == '\n')
                  continue;

            if (c == '#') {
                  c = skip_line(fp);
                  continue;
            }

            /* pick up 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';

            /* Eat trailing junk */
            if (c != '\n')
                  (void)skip_line(fp);

            return &e;

      } while (c != EOF);

      return (NULL);
}

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