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Comment: Edited by sciSpider (sch jbop) (X_X)@==(Q_Q)@

...

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="9188c0d3180d2f73-cde593a0-4d3d41d5-86a08464-d316cde0ef3ada95fdd4bc92"><ac:plain-text-body><![CDATA[

??(

[

 

??'

^

 

??>

}

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

??/

\

 

??<

{

 

??-

~

...

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

References

Wiki Markup
\[[ISO/IEC 9899-1999:TC2|AA. C References#ISO/IEC 9899-1999TC2]\] Section 5.2.1.1, "Trigraph sequences"
\[Wikipedia\] ["C Trigraphs"|http://en.wikipedia.org/wiki/C_trigraph]