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3.19 iswblank, iswblank_l—blank wide character test

Synopsis 

     #include <wctype.h>
     int iswblank(wint_t c);
     
     #include <wctype.h>
     int iswblank_l(wint_t c, locale_t locale);

Description
iswblank is a function which classifies wide-character values that are categorized as blank.

iswblank_l is like iswblank but performs the check based on the locale specified by the locale object locale. If locale is LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.
Returns
iswblank, iswblank_l return non-zero if c is a blank wide character.
Portability
iswblank is C99. iswblank_l is POSIX-1.2008.

No supporting OS subroutines are required.