iswalpha(3) — Linux manual page

iswalpha(3)             Library Functions Manual             iswalpha(3)

NAME         top

       iswalpha - test for alphabetic wide character

LIBRARY         top

       Standard C library (libc, -lc)

SYNOPSIS         top

       #include <wctype.h>

       int iswalpha(wint_t wc);

DESCRIPTION         top

       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'.

RETURN VALUE         top

       The iswalpha() function returns nonzero if wc is a wide character
       belonging to the wide-character class "alpha".  Otherwise, it
       returns zero.

ATTRIBUTES         top

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

       ┌───────────────────────────────┬───────────────┬────────────────┐
       │Interface                      │ Attribute     │ Value          │
       ├───────────────────────────────┼───────────────┼────────────────┤
       │iswalpha()                     │ Thread safety │ MT-Safe locale │
       └───────────────────────────────┴───────────────┴────────────────┘

STANDARDS         top

       C11, POSIX.1-2008.

HISTORY         top

       POSIX.1-2001, C99.

NOTES         top

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

SEE ALSO         top

       isalpha(3), iswctype(3)

Linux man-pages 6.04           2023-03-30                    iswalpha(3)

Pages that refer to this page: isalpha(3),  iswctype(3)

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