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@node iswblank
@section @code{iswblank}
@findex iswblank
POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/iswblank.html}
Gnulib module: iswblank
Portability problems fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
Minix 3.1.8, IRIX 6.5, Solaris 9, mingw, MSVC 9, Android 4.4.
@item
This function is declared but not defined on some platforms:
IRIX 6.5.30.
@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.
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
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