POSIX provides a way to the libc implementor to add non-ASCII characters to the
"digit" character class. However, ISO C 99 section 7.25.2.1.5 takes that
freedom away. The iswdigit() function is not ISO C compliant on a number of
platforms. This series of patches provides the workaround.


2020-01-25  Bruno Haible  <bruno@clisp.org>

	mbchar, wctype: Use the corrected iswdigit function.
	* modules/mbchar (Depends-on): Add iswdigit.
	* modules/wctype (Depends-on): Likewise.

	iswdigit: Add tests.
	* tests/test-iswdigit.c: New file.
	* tests/test-iswdigit.sh: New file.
	* modules/iswdigit-tests: New file.

	iswdigit: New module.
	* m4/iswdigit.m4: New file.
	* lib/wctype.in.h (iswdigit): Potentially override.
	(iswdigit, rpl_iswdigit): Test REPLACE_ISWDIGIT, not REPLACE_ISWCNTRL.
	* lib/iswdigit.c: New file.
	* m4/wctype_h.m4 (gl_WCTYPE_H_DEFAULTS): Initialize GNULIB_ISWDIGIT,
	REPLACE_ISWDIGIT.
	* modules/wctype-h (Makefile.am): Substitute GNULIB_ISWDIGIT,
	REPLACE_ISWDIGIT.
	* modules/iswdigit: New file.
	* doc/posix-functions/iswdigit.texi: Mention the portability problem.