iswalpha

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



NAME
       iswalpha - test for alphabetic wide character

SYNOPSIS
       #include <wctype.h>

       int iswalpha(wint_t wc);

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

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

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

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

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

SEE ALSO
       isalpha(3), iswctype(3)

COLOPHON
       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)