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Re^4: How is perl able to handle the null byte?by BrowserUk (Patriarch) |
on Jun 16, 2006 at 19:57 UTC ( [id://555868]=note: print w/replies, xml ) | Need Help?? |
I question strongly that this is a serious performance issue ... Think again. The taint flag is set at a few, very specific points of input. And it remains set until it is modified Think of all the different ways a string can be read in, constructed or modified. Interpolation of other strings, concatenation, join, pack, unpack, qq//, s///, tr///, substr, chomp, chop, sprintf, read, sysread, vec, promotion of IVs & NVs to PVs etc. etc. Every time a scalar is modified it would be necessary to recheck whether it now (or still) contains one or more null characters--and if it does, whether they are a legitimate part of a multibyte character or not. Still doubt the performance impact? Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
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