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From: Bruno Haible <bruno@clisp.org>
To: Thomas Wolff <towo@towo.net>
Cc: cygwin@cygwin.com, Assaf Gordon <assafgordon@gmail.com>
Subject: Re: iswcntrl() regression
Date: Wed, 19 Dec 2018 21:57:25 +0100
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References: <24530320.43gEWRNkUz@omega> <cd4691c0-da99-46b5-6001-594499a8d2fa@towo.net> <20181219133711.GJ28727@calimero.vinschen.de>
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Hello Thomas,

Oops 1: I forgot to add the reference to POSIX:
http://pubs.opengroup.org/onlinepubs/9699919799/functions/iswcntrl.html

Oops 2:
The relevant expression is iswcntrl (WEOF), not iswcntrl (EOF).

> > Are there any other special requirements concerning EOF?

WEOF is a special value. The difference between wint_t and wchar_t is
essentially that WEOF fits into wint_t but is not guaranteed to fit in wchar_t.
(Like EOF fits into 'int' but usually does not fit in 'unsigned char'.)

WEOF is special for all functions declared in <wctype.h>, see

http://pubs.opengroup.org/onlinepubs/9699919799/functions/iswalnum.html
http://pubs.opengroup.org/onlinepubs/9699919799/functions/iswalpha.html
http://pubs.opengroup.org/onlinepubs/9699919799/functions/iswblank.html
http://pubs.opengroup.org/onlinepubs/9699919799/functions/iswcntrl.html
http://pubs.opengroup.org/onlinepubs/9699919799/functions/iswdigit.html
http://pubs.opengroup.org/onlinepubs/9699919799/functions/iswgraph.html
http://pubs.opengroup.org/onlinepubs/9699919799/functions/iswlower.html
http://pubs.opengroup.org/onlinepubs/9699919799/functions/iswprint.html
http://pubs.opengroup.org/onlinepubs/9699919799/functions/iswpunct.html
http://pubs.opengroup.org/onlinepubs/9699919799/functions/iswspace.html
http://pubs.opengroup.org/onlinepubs/9699919799/functions/iswupper.html
http://pubs.opengroup.org/onlinepubs/9699919799/functions/iswxdigit.html
http://pubs.opengroup.org/onlinepubs/9699919799/functions/iswctype.html

http://pubs.opengroup.org/onlinepubs/9699919799/functions/towlower.html
http://pubs.opengroup.org/onlinepubs/9699919799/functions/towupper.html
http://pubs.opengroup.org/onlinepubs/9699919799/functions/towctrans.html

> this could be fixed in iswcntrl_l.c as a special condition, or
> injected as a special case in the categories.t table.

Probably, yes.

Bruno


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