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Re: [PATCH v2 0/5] Speed up uNN_chr and uNN_strchr with Boyer-Moore algo


From: Bruno Haible
Subject: Re: [PATCH v2 0/5] Speed up uNN_chr and uNN_strchr with Boyer-Moore algorithm
Date: Sat, 31 Jul 2010 22:25:49 +0200
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Paolo Bonzini wrote:
> >> The point is that u8_mbtouc will look only one byte past the end of
> >> a (valid or invalid) character
> >
> > This is not guaranteed. If you call u8_mbtouc(&uc, needle, 4) you are
> > asserting that needle[0..3] are valid memory addresses.
> 
> In practice that's not what happens.  The code does guarantee what I wrote.

The code may be changed in the future. If a guarantee is not documented AND
checked by the test suite, you cannot rely on it.

Bruno



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