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3.17 iswalpha, iswalpha_l—alphabetic wide character test

Synopsis 

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

Description
iswalpha is a function which classifies wide-character values that are alphabetic.

iswalpha_l is like iswalpha 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
iswalpha, iswalpha_l return non-zero if c is an alphabetic wide character.
Portability
iswalpha is C99. iswalpha_l is POSIX-1.2008.

No supporting OS subroutines are required.