@node iswalpha
@section @code{iswalpha}
@findex iswalpha

POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/iswalpha.html}

Gnulib module: wctype

Portability problems fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
IRIX 5.3, Solaris 2.5.1.
@item
This function returns 0 for all possible arguments on some platforms:
Linux libc5.
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@item
On Windows platforms, @code{wchar_t} is a 16-bit type and therefore cannot
accommodate all Unicode characters.
@end itemize