iswalpha(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON

ISWALPHA(3)             Linux Programmer's Manual            ISWALPHA(3)

NAME         top

       iswalpha - test for alphabetic wide character

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 │
       └───────────────────────────────┴───────────────┴────────────────┘

CONFORMING TO         top

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

NOTES         top

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

SEE ALSO         top

       isalpha(3), iswctype(3)

COLOPHON         top

       This page is part of release 5.12 of the Linux man-pages project.
       A description of the project, information about reporting bugs,
       and the latest version of this page, can be found at
       https://www.kernel.org/doc/man-pages/.

GNU                            2021-03-22                    ISWALPHA(3)

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