regex library fails git tests
Eric Blake
eblake@redhat.com
Mon Jul 22 19:19:00 GMT 2013
On 07/22/2013 02:12 AM, Corinna Vinschen wrote:
>>> However, please note that this behaviour, while being provided by glibc
>>> and now by Cygwin, is *not* standards-compliant. In the narrow sense
>>> the characters beyond 0x7f are still invalid ASCII chars, and other
>>> functions working with wchar_t strings won't be as forgiving when using
>>> invalid input.
>>>
> After some sleep, I think I now understand why the glibc devs made
> regcomp to work this way. This behaviour is backward compatible to non
> locale-aware applications. In the "C" locale, a char is just some
> arbitrary byte between 0 and 255. So this pattern always worked before
> in the "C locale, therefore it makes sense that it continues to work,
> even if it won't when using other locales/codesets.
By the way, there is currently a big debate going on in the Austin Group
(the people responsible for POSIX) on whether the "C" locale must be
8-bit clean (the way glibc behaves) or whether it was intended to allow
UTF-8 encoding by default (the way musl libc wants to behave); and
resolution of the debate will require input from the C standards
committee. There may be some interesting fallout, no matter which
solution is finally reached. http://austingroupbugs.net/view.php?id=663
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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