Manpages - iswalpha.3

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*(3) 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 nonzero if wc is a wide character belonging to the wide-character class “alpha”. Otherwise, it returns zero.

For an explanation of the terms used in this section, see *attributes*(7).

POSIX.1-2001, POSIX.1-2008, C99.

The behavior of iswalpha*() depends on the *LC_CTYPE category of the current locale.

*isalpha*(3), *iswctype*(3)

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