lex.c

源码漏洞检查

  case 'w': 
  case 'x': 
  case 'y': 
  case 'z': 
  case 'A': 
  case 'B': 
  case 'C': 
  case 'D': 
  case 'E': 
  case 'F': 
  case 'G': 
  case 'H': 
  case 'I': 
  case 'J': 
  case 'K': 
  case 'M': 
  case 'N': 
  case 'O': 
  case 'P': 
  case 'Q': 
  case 'R': 
  case 'S': 
  case 'T': 
  case 'U': 
  case 'V': 
  case 'W': 
  case 'X': 
  case 'Y': 
  case 'Z': 
  case '_': 
  case '$':
    StartIdentifier(t);
    t = GetChar();
    while (isalnum(t) || t == '_' || t == '$' || t == '\\') 
      { 
	if(t == '\\')
	  {
	    switch(t = GetChar())
	      {
	      case '\n':
		lineno++;
		lineno_offset++;
		t = GetChar();
		continue;
	      default:
		UngetChar(t);
		UngetChar('\\');
		EndIdentifier();
		goto next;
	      }
	  }
	ContinueIdentifier(t);
	t = GetChar(); 
      } 
    UngetChar(t); 
    EndIdentifier();
    goto next; 
  case '0': 
    if(preproc)
      {
	LexPreprocNumber('0');
	goto next;
      }
    
    switch(t = GetChar())
      {
      case '\\':
	switch(t = GetChar())
	  {
	  case '\n':
	    lineno++;
	    lineno_offset++;
	    goto next;
	  default:
	    UngetChar(t);
	    UngetChar('\\');
	    StartBase10OrLowerNum(0);
	    EndNum();
	    goto next;
	  }
      case 'x':
      case 'X':
	t2 = t;
	StartHexNum();
      starting_hex_num:
	switch(t = GetChar())
	  {
	  case '\\':
	    switch(t = GetChar())
	      {
	      case '\n':
		lineno++;
		lineno_offset++;
		goto starting_hex_num;
	      default:
		goto errBadToken;
	      }
	  case '0':
	  case '1':
	  case '2':
	  case '3':
	  case '4':
	  case '5':
	  case '6':
	  case '7':
	  case '8':
	  case '9':
	  case 'a':
	  case 'A':
	  case 'b':
	  case 'B':
	  case 'c':
	  case 'C':
	  case 'd':
	  case 'D':
	  case 'e':
	  case 'E':
	  case 'f':
	  case 'F':
	    AddHexDigit(t);
	  next_hex_digit:
	    switch(t = GetChar())
	      {
	      case '\\':
		switch(t = GetChar())
		  {
		  case '\n':
		    lineno++;
		    lineno_offset++;
		    goto next_hex_digit;
		  default:
		    EndNum();
		    UngetChar(t);
		    UngetChar('\\');
		    goto next;
		  }
	      case '0':
	      case '1':
	      case '2':
	      case '3':
	      case '4':
	      case '5':
	      case '6':
	      case '7':
	      case '8':
	      case '9':
	      case 'a':
	      case 'A':
	      case 'b':
	      case 'B':
	      case 'c':
	      case 'C':
	      case 'd':
	      case 'D':
	      case 'e':
	      case 'E':
	      case 'f':
	      case 'F':
		AddHexDigit(t);		
		goto next_hex_digit;
	      case 'l':
	      case 'L':
		MakeLong();
	      check_for_unsigned:
		switch(t = GetChar())
		  {
		  case '\\':
		    switch(t = GetChar())
		      {
		      case '\n':
			lineno++;
			lineno_offset++;
			goto check_for_unsigned;
		      default:
			EndNum();
			UngetChar(t);
			UngetChar('\\');
			goto next;
		      }
		  case 'u':
		  case 'U':
		    MakeUnsigned();
		    EndNum();
		    goto next;
		  default:
		    UngetChar(t);
		    EndNum();
		    goto next;
		  }
	      case 'u':
	      case 'U':
		MakeUnsigned();
	      check_for_long:
		switch(t = GetChar())
		  {
		  case '\\':
		    switch(t = GetChar())
		      {
		      case '\n':
			lineno++;
			lineno_offset++;
			goto check_for_long;
		      default:
			EndNum();
			UngetChar(t);
			UngetChar('\\');
			goto next;
		      }
		  case 'l':
		  case 'L':
		    MakeLong();
		    EndNum();
		    goto next;
		  default:
		    UngetChar(t);
		    EndNum();
		    goto next;
		  }
	      default:
		EndNum();
		UngetChar(t);
		goto next;
	      }
	  default:
	    UngetChar(t);
	    UngetChar(t2);
	    StartBase10OrLowerNum(0);
	    EndNum();
	    goto next;
	  }
      case '0':
      case '1':
      case '2':
      case '3':
      case '4':
      case '5':
      case '6':
      case '7':
	StartBase10OrLowerNum('0');
	AddOctDigit(t);
      next_oct_digit:
	switch(t = GetChar())
	  {
	  case '\\':
	    switch(t = GetChar())
	      {
	      case '\n':
		lineno++;
		lineno_offset++;
		goto next_oct_digit;
	      default:
		EndNum();
		UngetChar(t);
		UngetChar('\\');
		goto next;
	      }
	  case '0':
	  case '1':
	  case '2':
	  case '3':
	  case '4':
	  case '5':
	  case '6':
	  case '7':
	    AddOctDigit(t);
	    goto next_oct_digit;
	  case '.':
	    AddDecDigit(t);
	    goto next_mantissa_digit;
	  case 'l':
	  case 'L':
	    MakeLong();
		  check_for_unsigned_2:
	    switch(t = GetChar())
	      {
	      case '\\':
		switch(t = GetChar())
		  {
		  case '\n':
		    lineno++;
		    lineno_offset++;
		    goto check_for_unsigned_2;
		  default:
		    EndNum();
		    UngetChar(t);
		    UngetChar('\\');
		    goto next;
		  }
	      case 'u':
	      case 'U':
		MakeUnsigned();
		EndNum();
		goto next;
	      default:
		UngetChar(t);
		EndNum();
		goto next;
	      }
	  case 'u':
	  case 'U':
	    MakeUnsigned();
		  check_for_long_2:
	    switch(t = GetChar())
	      {
	      case '\\':
		switch(t = GetChar())
		  {
		  case '\n':
		    lineno++;
		    lineno_offset++;
		    goto check_for_long_2;
		  default:
		    EndNum();
		    UngetChar(t);
		    UngetChar('\\');
		    goto next;
		  }
	      case 'l':
	      case 'L':
		MakeLong();
		EndNum();
		goto next;
	      default:
		UngetChar(t);
		EndNum();
		goto next;
	      }
	  default:
	    EndNum();
	    UngetChar(t);
	    goto next;
	  }
      case '.':
	StartBase10OrLowerNum('0');
	AddDecDigit('.');
      next_mantissa_digit:
	switch(t = GetChar())
	  { 
	  case '\\':
	    switch(t = GetChar())
	      {
	      case '\n':
		lineno++;
		lineno_offset++;
		goto next_mantissa_digit;
	      default:
		EndNum();
		UngetChar(t);
		UngetChar('\\');
		goto next;
	      }
	  case '0':
	  case '1':
	  case '2':
	  case '3':
	  case '4':
	  case '5':
	  case '6':
	  case '7':
	  case '8':
	  case '9':
	    AddDecDigit(t);
	    goto next_mantissa_digit;
	  case 'e':
	  case 'E':
	  collect_exponent:
	  saved_char = t;
	  switch(t = GetChar())
	    {
	    case '\\':
	      switch(t = GetChar())
		{
		case '\n':
		  lineno++;
		  lineno_offset++;
		  goto collect_exponent;
		default:
		  goto errBadToken;
		}
	    case '+':
	    case '-':
	    got_sign:
	      switch(t2 = GetChar())
		{
		case '\\':
		  switch(t = GetChar())
		    {
		    case '\n':
		      lineno++;
		      lineno_offset++;
		      goto got_sign;
		    default:
		      UngetChar(t2);
		      UngetChar(t);
		      UngetChar(saved_char);
		      EndNum();
		      goto next;
		    }
		case '0':
		case '1':
		case '2':
		case '3':
		case '4':
		case '5':
		case '6':
		case '7':
		case '8':
		case '9':
		  UngetChar(t2);		
		  break;
		default:
		  UngetChar(t2);
		  UngetChar(t);
		  UngetChar(saved_char);
		  EndNum();
		  goto next;
		}
	    case '0':
	    case '1':
	    case '2':
	    case '3':
	    case '4':
	    case '5':
	    case '6':
	    case '7':
	    case '8':
	    case '9':
	      BeginExponent(t);
	    next_exp_digit_v1:
	      switch(t = GetChar())
		{
		case '\\':
		  switch(t = GetChar())
		    {
		    case '\n':
		      lineno++;
		      lineno_offset++;
		      goto next_exp_digit_v1;
		    default:
		      EndNum();	
		      UngetChar(t);
		      UngetChar('\\');
		    }
		case '0':
		case '1':
		case '2':
		case '3':
		case '4':
		case '5':
		case '6':
		case '7':
		case '8':
		case '9':
		  AddExponent(t);
		  goto next_exp_digit_v1;
		case 'f':
		case 'F':
		  MakeFloat();
		  EndNum();
		  goto next;
		case 'l':
		case 'L':
		  MakeLong();
		  EndNum();
		  goto next;
		default:
		  EndNum();
		  UngetChar(t);
		  goto next;
		}
	    default:
	      UngetChar(t);
	      EndNum();
	      goto next;
	    }
	  case 'f':
	  case 'F':
	    MakeFloat();
	    EndNum();
	    goto next;
	  case 'l':
	  case 'L':
	    MakeLong();
	    EndNum();
	    goto next;
	  default:
	    EndNum();
	    UngetChar(t);
	    goto next;
	  }
      default:
	UngetChar(t);
	StartBase10OrLowerNum('0');
	EndNum();
	goto next;
      }
  case '1': 
  case '2': 
  case '3': 
  case '4': 
  case '5': 
  case '6': 
  case '7': 
  case '8': 
  case '9': 
    if(cpp_mode)
      {
	LexPreprocNumber(t);
	goto next;
      }
    StartBase10OrLowerNum(t);
  got_first_digit:
    switch(t = GetChar())
      {
      case '\\':
	switch(t = GetChar())
	  {
	  case '\n':
	    lineno++;
	    lineno_offset++;
	    goto got_first_digit;
	  default:
	    EndNum();
	    UngetChar(t);
	    UngetChar('\\');
	    goto next;
	  }
      case '0':
      case '1':
      case '2':
      case '3':
      case '4':
      case '5':
      case '6':
      case '7':
      case '8':
      case '9':
	AddDecDigit(t);
      next_dec_digit:
	switch(t = GetChar())
	  {
	  case '\\':
	    switch(t = GetChar())
	      {
	      case '\n':
		lineno++;
		lineno_offset++;
		goto next_dec_digit;
	      default:
		EndNum();
		UngetChar(t);
		UngetChar('\\');
		goto next;
	      }
	  case '0':
	  case '1':
	  case '2':
	  case '3':
	  case '4':
	  case '5':
	  case '6':
	  case '7':
	  case '8':
	  case '9':
	    AddDecDigit(t);
	    goto next_dec_digit;
	  case 'e':
	  case 'E':
	    goto collect_exponent;
	  case '.':
	    AddDecDigit('.');
	    goto next_mantissa_digit;
	  case 'l':
	  case 'L':
	    MakeLong();
	  check_unsigned_3:
	    switch(t = GetChar())
	      {
	      case '\\':
		switch(t = GetChar())
		  {
		  case '\n':
		    lineno++;
		    lineno_offset++;
		    goto check_unsigned_3;
		  default:
		    EndNum();
		    UngetChar(t);
		    UngetChar('\\');
		    goto next;
		  }
	      case 'u':
	      case 'U':
		MakeUnsigned();
		EndNum();
		goto next;
	      default:
		UngetChar(t);
		EndNum();
		goto next;
	      }
	  case 'u':
	  case 'U':
	    MakeUnsigned();
	  check_long_3:
	    switch(t = GetChar())
	      {
	      case '\\':
		switch(t = GetChar())
		  {
		  case '\n':
		    lineno++;
		    lineno_offset++;
		    goto check_long_3;
		  default:
		    EndNum();
		    UngetChar(t);
		    UngetChar('\\');
		    goto next;
		  }
	      case 'l':
	      case 'L':
		MakeLong();
		EndNum();
		goto next;
	      default:
		UngetChar(t);
		EndNum();
		goto next;
	      }
	  default:
	    UngetChar(t);
	    EndNum();
	    goto next;
	  }
      case 'e':
      case 'E': 
	goto collect_exponent;
      case '.':
	AddDecDigit('.');
	goto next_mantissa_digit;
      case 'l':
      case 'L':
	MakeLong();
      check_unsigned_4:
	switch(t = GetChar())
	  {
	  case '\\':
	    switch(t = GetChar())
	      {
	      case '\n':
		lineno++;
		lineno_offset++;
		goto check_unsigned_4;
	      default:
		EndNum();
		UngetChar(t);
		UngetChar('\\');
		goto next;
	      }
	  case 'u':
	  case 'U':
	    MakeUnsigned();
	    EndNum();
	    goto next;
	  default:
	    UngetChar(t);
	    EndNum();
	    goto next;
	  }
      case 'u':
      case 'U':
	MakeUnsigned();
      check_long_4:
	switch(t = GetChar())
	  {
	      case '\\':
		switch(t = GetChar())
		  {
		  case '\n':
		    lineno++;
		    lineno_offset++;
		    goto check_long_4;
		  default:
		    EndNum();
		    UngetChar(t);
		    UngetChar('\\');
		    goto next;
		  }
	  case 'l':
	  case 'L':
	    MakeLong();
	    EndNum();
	    goto next;
	  default:
	    UngetChar(t);
	    EndNum();
	    goto next;
	  }
      default:
	UngetChar(t);
	EndNum();
	goto next;
      }
  case '.':
    if(cpp_mode)
      {
	t= GetChar();
	UngetChar(t);
	switch(t)
	  {
	  case '0':
	  case '1':
	  case '2':
	  case '3':
	  case '4':
	  case '5':
	  case '6':
	  case '7':
	  case '8':
	  case '9':
	    LexPreprocNumber('.');
	    goto next;
	  default:
	    GenOp(".");
	    goto next;
	  }
      }
  got_period:
    t = GetChar();
    switch(t)
      {
      case '\\':
	switch(t = GetChar())
	  {
	  case '\n':
	    lineno++;
	    lineno_offset++;
	    goto got_period;
	  default:
	    UngetChar(t);
	    UngetChar('\\');
	    GenOp(".");
	    goto next;
	  }
      case '0':
      case '1':
      case '2':
      case '3':
      case '4':
      case '5':
      case '6':
      case '7':
      case '8':
      case '9':
	StartBase10OrLowerNum('0');
	AddDecDigit('.');
	UngetChar(t);
	goto next_mantissa_digit;
      default:
	UngetChar(t);
	GenOp(".");
	goto next;
      }

  case '\\':
    switch(t = GetChar())
      {
      case '\n':
	lineno++;
	// Don't bump lineno_offset; haven't started a token.
	goto next;
      default:
	goto errBadToken;
      }

  default: 
    goto errBadToken; 
  } 
 unterminatedCommentError: 
  if(return_on_error)
    return EOF;
  fprintf(stderr, "%s: Error: Unterminated comment." NEWLINE, source_id); 
  exit(0); 
 eofError: 
  if(return_on_error)
    return EOF;
  fprintf(stderr, "%s: Error: Unexpected end of file encountered." NEWLINE,
	  source_id); 
  exit(0);
 errBadToken: 
  if(return_on_error)
    return EOF;
  fprintf(stderr, "%s:%d: Unrecognized token." NEWLINE
	  "Skipping to the next line and continuing..." NEWLINE, source_id,
	  lineno); 
  while((t = GetChar())) 
    { 
      switch(t) 
        { 
        case '\n': 
          lineno++; 
	  return 1;
        case EOF: 
	  return 0;
        default: 
          continue; 
        } 
    }
  return 0;
}