iswblank
========

POSIX specification: http://www.opengroup.org/susv3xsh/iswblank.html

Gnulib module: ---

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib:

  * This function is missing on some platforms: AIX 4.3.2, IRIX 6.5, OSF/1 5.1, Solaris 9, mingw.

  * On Windows platforms, wchar_t is a 16-bit type and therefore cannot accommodate all Unicode characters.