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iswblank
POSIX specification:
http://www.opengroup.org/onlinepubs/9699919799/functions/iswblank.html
Gnulib module: iswblank
Portability problems fixed by Gnulib:
-D_GNU_SOURCE
) on some platforms:
glibc 2.8.
Portability problems not fixed by Gnulib:
wchar_t
is a 16-bit type and therefore cannot
accommodate all Unicode characters.