grammar.c

Windows XP下的抓包程序实现

	/* Each stack pointer address is followed by the size of the
	   data in use in that stack, in bytes.  This used to be a
	   conditional around just the two extra args, but that might
	   be undefined if yyoverflow is a macro.  */
	yyoverflow (YY_("memory exhausted"),
		    &yyss1, yysize * sizeof (*yyssp),
		    &yyvs1, yysize * sizeof (*yyvsp),

		    &yystacksize);

	yyss = yyss1;
	yyvs = yyvs1;
      }
#else /* no yyoverflow */
# ifndef YYSTACK_RELOCATE
      goto yyexhaustedlab;
# else
      /* Extend the stack our own way.  */
      if (YYMAXDEPTH <= yystacksize)
	goto yyexhaustedlab;
      yystacksize *= 2;
      if (YYMAXDEPTH < yystacksize)
	yystacksize = YYMAXDEPTH;

      {
	short int *yyss1 = yyss;
	union yyalloc *yyptr =
	  (union yyalloc *) YYSTACK_ALLOC (YYSTACK_BYTES (yystacksize));
	if (! yyptr)
	  goto yyexhaustedlab;
	YYSTACK_RELOCATE (yyss);
	YYSTACK_RELOCATE (yyvs);

#  undef YYSTACK_RELOCATE
	if (yyss1 != yyssa)
	  YYSTACK_FREE (yyss1);
      }
# endif
#endif /* no yyoverflow */

      yyssp = yyss + yysize - 1;
      yyvsp = yyvs + yysize - 1;


      YYDPRINTF ((stderr, "Stack size increased to %lu\n",
		  (unsigned long int) yystacksize));

      if (yyss + yystacksize - 1 <= yyssp)
	YYABORT;
    }

  YYDPRINTF ((stderr, "Entering state %d\n", yystate));

  goto yybackup;

/*-----------.
| yybackup.  |
`-----------*/
yybackup:

/* Do appropriate processing given the current state.  */
/* Read a look-ahead token if we need one and don't already have one.  */
/* yyresume: */

  /* First try to decide what to do without reference to look-ahead token.  */

  yyn = yypact[yystate];
  if (yyn == YYPACT_NINF)
    goto yydefault;

  /* Not known => get a look-ahead token if don't already have one.  */

  /* YYCHAR is either YYEMPTY or YYEOF or a valid look-ahead symbol.  */
  if (yychar == YYEMPTY)
    {
      YYDPRINTF ((stderr, "Reading a token: "));
      yychar = YYLEX;
    }

  if (yychar <= YYEOF)
    {
      yychar = yytoken = YYEOF;
      YYDPRINTF ((stderr, "Now at end of input.\n"));
    }
  else
    {
      yytoken = YYTRANSLATE (yychar);
      YY_SYMBOL_PRINT ("Next token is", yytoken, &yylval, &yylloc);
    }

  /* If the proper action on seeing token YYTOKEN is to reduce or to
     detect an error, take that action.  */
  yyn += yytoken;
  if (yyn < 0 || YYLAST < yyn || yycheck[yyn] != yytoken)
    goto yydefault;
  yyn = yytable[yyn];
  if (yyn <= 0)
    {
      if (yyn == 0 || yyn == YYTABLE_NINF)
	goto yyerrlab;
      yyn = -yyn;
      goto yyreduce;
    }

  if (yyn == YYFINAL)
    YYACCEPT;

  /* Shift the look-ahead token.  */
  YY_SYMBOL_PRINT ("Shifting", yytoken, &yylval, &yylloc);

  /* Discard the token being shifted unless it is eof.  */
  if (yychar != YYEOF)
    yychar = YYEMPTY;

  *++yyvsp = yylval;


  /* Count tokens shifted since error; after three, turn off error
     status.  */
  if (yyerrstatus)
    yyerrstatus--;

  yystate = yyn;
  goto yynewstate;


/*-----------------------------------------------------------.
| yydefault -- do the default action for the current state.  |
`-----------------------------------------------------------*/
yydefault:
  yyn = yydefact[yystate];
  if (yyn == 0)
    goto yyerrlab;
  goto yyreduce;


/*-----------------------------.
| yyreduce -- Do a reduction.  |
`-----------------------------*/
yyreduce:
  /* yyn is the number of a rule to reduce with.  */
  yylen = yyr2[yyn];

  /* If YYLEN is nonzero, implement the default value of the action:
     `$$ = $1'.

     Otherwise, the following line sets YYVAL to garbage.
     This behavior is undocumented and Bison
     users should not rely upon it.  Assigning to YYVAL
     unconditionally makes the parser a bit smaller, and it avoids a
     GCC warning that YYVAL may be used uninitialized.  */
  yyval = yyvsp[1-yylen];


  YY_REDUCE_PRINT (yyn);
  switch (yyn)
    {
        case 2:
#line 161 "../libpcap/GRAMMAR.Y"
    {
	finish_parse((yyvsp[0].blk).b);
}
    break;

  case 4:
#line 166 "../libpcap/GRAMMAR.Y"
    { (yyval.blk).q = qerr; }
    break;

  case 6:
#line 169 "../libpcap/GRAMMAR.Y"
    { gen_and((yyvsp[-2].blk).b, (yyvsp[0].blk).b); (yyval.blk) = (yyvsp[0].blk); }
    break;

  case 7:
#line 170 "../libpcap/GRAMMAR.Y"
    { gen_and((yyvsp[-2].blk).b, (yyvsp[0].blk).b); (yyval.blk) = (yyvsp[0].blk); }
    break;

  case 8:
#line 171 "../libpcap/GRAMMAR.Y"
    { gen_or((yyvsp[-2].blk).b, (yyvsp[0].blk).b); (yyval.blk) = (yyvsp[0].blk); }
    break;

  case 9:
#line 172 "../libpcap/GRAMMAR.Y"
    { gen_or((yyvsp[-2].blk).b, (yyvsp[0].blk).b); (yyval.blk) = (yyvsp[0].blk); }
    break;

  case 10:
#line 174 "../libpcap/GRAMMAR.Y"
    { (yyval.blk) = (yyvsp[-1].blk); }
    break;

  case 11:
#line 176 "../libpcap/GRAMMAR.Y"
    { (yyval.blk) = (yyvsp[-1].blk); }
    break;

  case 13:
#line 179 "../libpcap/GRAMMAR.Y"
    { (yyval.blk).b = gen_ncode(NULL, (bpf_u_int32)(yyvsp[0].i),
						   (yyval.blk).q = (yyvsp[-1].blk).q); }
    break;

  case 14:
#line 181 "../libpcap/GRAMMAR.Y"
    { (yyval.blk) = (yyvsp[-1].blk); }
    break;

  case 15:
#line 183 "../libpcap/GRAMMAR.Y"
    { (yyval.blk).b = gen_scode((yyvsp[0].s), (yyval.blk).q = (yyvsp[-1].blk).q); }
    break;

  case 16:
#line 184 "../libpcap/GRAMMAR.Y"
    { (yyval.blk).b = gen_mcode((yyvsp[-2].s), NULL, (yyvsp[0].i),
				    (yyval.blk).q = (yyvsp[-3].blk).q); }
    break;

  case 17:
#line 186 "../libpcap/GRAMMAR.Y"
    { (yyval.blk).b = gen_mcode((yyvsp[-2].s), (yyvsp[0].s), 0,
				    (yyval.blk).q = (yyvsp[-3].blk).q); }
    break;

  case 18:
#line 188 "../libpcap/GRAMMAR.Y"
    {
				  /* Decide how to parse HID based on proto */
				  (yyval.blk).q = (yyvsp[-1].blk).q;
				  (yyval.blk).b = gen_ncode((yyvsp[0].s), 0, (yyval.blk).q);
				}
    break;

  case 19:
#line 193 "../libpcap/GRAMMAR.Y"
    {
#ifdef INET6
				  (yyval.blk).b = gen_mcode6((yyvsp[-2].s), NULL, (yyvsp[0].i),
				    (yyval.blk).q = (yyvsp[-3].blk).q);
#else
				  bpf_error("'ip6addr/prefixlen' not supported "
					"in this configuration");
#endif /*INET6*/
				}
    break;

  case 20:
#line 202 "../libpcap/GRAMMAR.Y"
    {
#ifdef INET6
				  (yyval.blk).b = gen_mcode6((yyvsp[0].s), 0, 128,
				    (yyval.blk).q = (yyvsp[-1].blk).q);
#else
				  bpf_error("'ip6addr' not supported "
					"in this configuration");
#endif /*INET6*/
				}
    break;

  case 21:
#line 211 "../libpcap/GRAMMAR.Y"
    { 
				  (yyval.blk).b = gen_ecode((yyvsp[0].e), (yyval.blk).q = (yyvsp[-1].blk).q);
				  /*
				   * $1 was allocated by "pcap_ether_aton()",
				   * so we must free it now that we're done
				   * with it.
				   */
				  free((yyvsp[0].e));
				}
    break;

  case 22:
#line 220 "../libpcap/GRAMMAR.Y"
    {
				  (yyval.blk).b = gen_acode((yyvsp[0].e), (yyval.blk).q = (yyvsp[-1].blk).q);
				  /*
				   * $1 was allocated by "pcap_ether_aton()",
				   * so we must free it now that we're done
				   * with it.
				   */
				  free((yyvsp[0].e));
				}
    break;

  case 23:
#line 229 "../libpcap/GRAMMAR.Y"
    { gen_not((yyvsp[0].blk).b); (yyval.blk) = (yyvsp[0].blk); }
    break;

  case 24:
#line 231 "../libpcap/GRAMMAR.Y"
    { (yyval.blk) = (yyvsp[-1].blk); }
    break;

  case 25:
#line 233 "../libpcap/GRAMMAR.Y"
    { (yyval.blk) = (yyvsp[-1].blk); }
    break;

  case 27:
#line 236 "../libpcap/GRAMMAR.Y"
    { gen_and((yyvsp[-2].blk).b, (yyvsp[0].blk).b); (yyval.blk) = (yyvsp[0].blk); }
    break;

  case 28:
#line 237 "../libpcap/GRAMMAR.Y"
    { gen_or((yyvsp[-2].blk).b, (yyvsp[0].blk).b); (yyval.blk) = (yyvsp[0].blk); }
    break;

  case 29:
#line 239 "../libpcap/GRAMMAR.Y"
    { (yyval.blk).b = gen_ncode(NULL, (bpf_u_int32)(yyvsp[0].i),
						   (yyval.blk).q = (yyvsp[-1].blk).q); }
    break;

  case 32:
#line 244 "../libpcap/GRAMMAR.Y"
    { gen_not((yyvsp[0].blk).b); (yyval.blk) = (yyvsp[0].blk); }
    break;

  case 33:
#line 246 "../libpcap/GRAMMAR.Y"
    { QSET((yyval.blk).q, (yyvsp[-2].i), (yyvsp[-1].i), (yyvsp[0].i)); }
    break;

  case 34:
#line 247 "../libpcap/GRAMMAR.Y"
    { QSET((yyval.blk).q, (yyvsp[-1].i), (yyvsp[0].i), Q_DEFAULT); }
    break;

  case 35:
#line 248 "../libpcap/GRAMMAR.Y"
    { QSET((yyval.blk).q, (yyvsp[-1].i), Q_DEFAULT, (yyvsp[0].i)); }
    break;

  case 36:
#line 249 "../libpcap/GRAMMAR.Y"
    { QSET((yyval.blk).q, (yyvsp[-1].i), Q_DEFAULT, Q_PROTO); }
    break;

  case 37:
#line 250 "../libpcap/GRAMMAR.Y"
    { QSET((yyval.blk).q, (yyvsp[-1].i), Q_DEFAULT, Q_PROTOCHAIN); }
    break;

  case 38:
#line 251 "../libpcap/GRAMMAR.Y"
    { QSET((yyval.blk).q, (yyvsp[-1].i), Q_DEFAULT, (yyvsp[0].i)); }
    break;

  case 39:
#line 253 "../libpcap/GRAMMAR.Y"
    { (yyval.blk) = (yyvsp[0].blk); }
    break;

  case 40:
#line 254 "../libpcap/GRAMMAR.Y"
    { (yyval.blk).b = (yyvsp[-1].blk).b; (yyval.blk).q = (yyvsp[-2].blk).q; }
    break;

  case 41:
#line 255 "../libpcap/GRAMMAR.Y"
    { (yyval.blk).b = gen_proto_abbrev((yyvsp[0].i)); (yyval.blk).q = qerr; }
    break;

  case 42:
#line 256 "../libpcap/GRAMMAR.Y"
    { (yyval.blk).b = gen_relation((yyvsp[-1].i), (yyvsp[-2].a), (yyvsp[0].a), 0);
				  (yyval.blk).q = qerr; }
    break;

  case 43:
#line 258 "../libpcap/GRAMMAR.Y"
    { (yyval.blk).b = gen_relation((yyvsp[-1].i), (yyvsp[-2].a), (yyvsp[0].a), 1);
				  (yyval.blk).q = qerr; }
    break;

  case 44:
#line 260 "../libpcap/GRAMMAR.Y"
    { (yyval.blk).b = (yyvsp[0].rblk); (yyval.blk).q = qerr; }
    break;

  case 45:
#line 261 "../libpcap/GRAMMAR.Y"
    { (yyval.blk).b = gen_atmtype_abbrev((yyvsp[0].i));