Added unary operation defined #1529
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…efined # Conflicts: # docs/writingrules.rst # libyara/grammar.c # libyara/grammar.h # libyara/include/yara/exec.h # libyara/lexer.c # tests/test-rules.c
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plusvic
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Oct 21, 2021
tarterp
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YARA didn't support any expression which would check value against YR_UNDEFINED constant so checking for non-existence of something can be very problematic. But we run multiple times into issue of people asking us for checking of absence of something. Because of this we propose operator defined which would be unary operator (like not) which works like this: defined x evaluates to true - whenever x != YR_UNDEFINED false - whenever x == YR_UNDEFINED Related to issue VirusTotal#835
maximelb
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YARA didn't support any expression which would check value against YR_UNDEFINED constant so checking for non-existence of something can be very problematic. But we run multiple times into issue of people asking us for checking of absence of something. Because of this we propose operator defined which would be unary operator (like not) which works like this: defined x evaluates to true - whenever x != YR_UNDEFINED false - whenever x == YR_UNDEFINED Related to issue VirusTotal#835
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YARA didn't support any expression which would check value against YR_UNDEFINED constant so checking for non-existence of something can be very problematic. But we run multiple times into issue of people asking us for checking of absence of something.
Because of this we propose operator defined which would be unary operator (like not) which works like this:
defined x evaluates to
Related to issue #835