iswalpha - test for alphabetic wide character
#include <wctype.h>
int iswalpha (wint_t wc);
The iswalpha function is the wide-character equivalent of the isalpha
function. It tests whether wc is a wide character belonging to the wide
character class "alpha".
The wide character class "alpha" is a subclass of the wide character
class "alnum", and therefore also a subclass of the wide character
class "graph" and of the wide character class "print".
Being a subclass of the wide character class "print", the wide character
class "alpha" is disjoint from the wide character class "cntrl".
Being a subclass of the wide character class "graph", the wide character
class "alpha" is disjoint from the wide character class "space" and
its subclass "blank".
Being a subclass of the wide character class "alnum", the wide character
class "alpha" is disjoint from the wide character class "punct".
The wide character class "alpha" is disjoint from the wide character
class "digit".
The wide character class "alpha" contains the wide character classes
"upper" and "lower".
The wide character class "alpha" always contains at least the letters
'A' to 'Z' and 'a' to 'z'.
The iswalpha function returns non-zero if wc is a wide character
belonging to the wide character class "alpha". Otherwise it returns
zero.
ISO/ANSI C, UNIX98
isalpha(3), iswctype(3)
The behaviour of iswalpha depends on the LC_CTYPE category of the current
locale.
GNU 1999-07-25 ISWALPHA(3)
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