https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78155
Bruno Haible <bruno at clisp dot org> changed:
What |Removed |Added
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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=48440&action=edit
Test case
Another test case is the attached program, alpha.c. When run on glibc systems
on x86, x86_64, and other CPUs (not powerpc), it sign-extends the 'char'
argument; so the character 'ÿ' (in ISO-8859-1 encoding) becomes EOF, and the
<ctype.h> function returns 0.
$ LC_ALL=de_DE.ISO-8859-1 xterm
$ ./a.out ÿ
not alphabetic
The corrected program (with a cast to 'unsigned char' in the isalpha()
argument) behaves as expected:
$ LC_ALL=de_DE.ISO-8859-1 xterm
$ ./a.out ÿ
alphabetic
