...
All occurrences in a source file of the following sequences of three characters (that is, trigraph sequences) are replaced with the corresponding single character.
??=
#
??)
]
??!
|
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="42b090b4db9b7dd0-447d3c5b-48204924-9880a250-2d867a8a8298189ef4bfeba2"><ac:plain-text-body><![CDATA[
??(
[
??'
^
??>
}
]]></ac:plain-text-body></ac:structured-macro>
??/
\
??<
{
??-
~
...
The following compliant solution eliminates the accidental introduction of the trigraph.
| Code Block | ||
|---|---|---|
| ||
//* what is the value of a now */? a++; |
Non-Compliant Code Example
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The above code will print out Over 9000!??!, as intended.
Implementation Details
Some compilers provide options to warn when trigraphs are encountered, or to disable trigraph expansion. Use the warning options and ensure your code compiles cleanly (MSC00-A. Compile cleanly at high warning levels)
Risk Assessment
Recommendation | Severity | Likelihood | Remediation Cost | Priority | Level |
|---|---|---|---|---|---|
PRE07-A | 1 (low) | 1 (unlikely) | 2 (medium) | P2 | L3 |
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