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From: "bruno at clisp dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/78155] missing warning on invalid isalpha et al.
Date: Mon, 04 May 2020 11:51:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D78155

Bruno Haible <bruno at clisp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bruno at clisp dot org

--- Comment #6 from Bruno Haible <bruno at clisp dot org> ---
Created attachment 48440
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D48440&action=3Dedit
Test case

Another test case is the attached program, alpha.c. When run on glibc syste=
ms
on x86, x86_64, and other CPUs (not powerpc), it sign-extends the 'char'
argument; so the character '=C3=BF' (in ISO-8859-1 encoding) becomes EOF, a=
nd the
<ctype.h> function returns 0.

$ LC_ALL=3Dde_DE.ISO-8859-1 xterm
$ ./a.out =C3=BF
not alphabetic

The corrected program (with a cast to 'unsigned char' in the isalpha()
argument) behaves as expected:

$ LC_ALL=3Dde_DE.ISO-8859-1 xterm
$ ./a.out =C3=BF
alphabetic=