@node iswblank
@subsection @code{iswblank}
@findex iswblank

POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/iswblank.html}

Gnulib module: iswblank
@mindex iswblank

Portability problems fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
Minix 3.1.8, Solaris 9, mingw, MSVC 9, Android 4.4.
@item
This function is not declared (without @code{-D_GNU_SOURCE}) on some platforms:
glibc 2.8.
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@item
On Windows and 32-bit AIX platforms, @code{wchar_t} is a 16-bit type and
therefore cannot accommodate all Unicode characters.
@mindex c32isblank
However, the Gnulib function @code{c32isblank}, provided by Gnulib module
@code{c32isblank}, operates on 32-bit wide characters and therefore does not
have this limitation.
@end itemize
