Re: regex_internal: uninitialized memory access (long)

[Paul Eggert]

Thanks for tracking this bug down. I introduced the bug in 2006 when I noticed 
that the expression '(size_t) (mbclen + 2) > 2' can have undefined behavior on 
(admittedly unlikely) platforms where size_t is one bit narrower than int. (Such 
platforms have existed in the past - I even worked for a company that sold them! 
- though these days I expect they're rarely used.) I replaced the expression 
with 'mbclen < (size_t) -2' to avoid undefined behavior, but unfortunately my 
replacement was incorrect as it is not equivalent when mbclen == 0.

Please try the attached gnulib patch, which should fix the problem in a portable 
way. Modern GCC optimizes the clear code just as well as the confusing code, so 
we might as well write it clearly.

0001-regex-fix-uninitialized-memory-access.patch
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