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All occurrences in a source file of the following sequences of three characters (ie. trigraph sequences) are replaced with the corresponding single character.

??=

#

 

??)

]

 

??!

|

<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="2dc3ccb3434b199b-54a5624a-475c46ef-b4318b1c-51f31f5c725c54e0a3fc1f07"><ac:plain-text-body><![CDATA[

??(

[

 

??'

^

 

??>

}

]]></ac:plain-text-body></ac:structured-macro>

??/

\

 

??<

{

 

??-

~

...

Recommendation

Severity

Likelihood

Remediation Cost

Priority

Level

PRE05 PRE07-A

1 (low)

1 (unlikely)

2 (medium)

P2

L3

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Search for vulnerabilities resulting from the violation of this rule on the CERT website.

References

Wiki Markup
\[[ISO/IEC 9899-1999|AA. C References#ISO/IEC 9899-1999]\] Section 5.2.1.1, "Trigraph sequences"
\[Wikipedia\] ["C Trigraphs"|http://en.wikipedia.org/wiki/C_trigraph]