A-14 APPENDIX A: PACKET FILTER OPCODES, EXAMPLES, AND SYNTAX ERRORS
Invalid
characters
in number
The number specified as an offset or literal is improperly
formatted. Possible causes are 1) lack of white space setting
off the number, and 2) invalid characters in the number.
Note: The radix of the number is determined by the first 1 or
2 characters of the number.
■A number with a leading “0x” or “0X” is treated as
hexadecimal.
■A number with a leading 0 is treated as octal.
■All other numbers are treated as decimal.
Number is too
large The number specified as an offset or literal is too large.
An offset is limited to 1518 minus the size of the operand.
For example, the offset for pushField.b can be no more than
1517 and the offset for pushField.w no more than 1516.
A literal value is limited to the number of bytes in the
operand size (1, 2, 4, or 6).
Missing open
quote on string The string specified does not have a starting quotation
mark (").
String is too
long The string specified is too long. Strings are limited to 32
characters exclusive of the opening and closing quotation
marks.
Missing close
quote on string The string specified does not have an ending quotation mark
(").
Multiple name
statements in
program
More than one name statement was found in the program.
Only a single name statement is allowed.
Program too large The program exceeds the maximum size allowed. The causes
of this error include a source definition exceeding 4096
bytes, a stored format exceeding 254 bytes, or a run-time
format exceeding 2048 bytes. All of these boundary
conditions are checked when the filter is loaded. See
Table 13-2 for more information on packet filter sizes.
Too many errors
- compilation
aborted
The program contains an excessive number of errors. No
further syntax errors will be reported. The program stops
compiling when this condition occurs.
Table A-1 Possible Syntax Errors When Loading Packet Filters (continued)
Syntax Error Description