iswalnum(3) — Linux manual page

iswalnum(3)             Library Functions Manual             iswalnum(3)

NAME

       iswalnum - test for alphanumeric wide character

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

       #include <wctype.h>

       int iswalnum(wint_t wc);

DESCRIPTION

       The iswalnum() function is the wide-character equivalent of the
       isalnum(3) function.  It tests whether wc is a wide character
       belonging to the wide-character class "alnum".

       The wide-character class "alnum" is a subclass of the wide-
       character class "graph", and therefore also a subclass of the
       wide-character class "print".

       Being a subclass of the wide-character class "print", the wide-
       character class "alnum" is disjoint from the wide-character class
       "cntrl".

       Being a subclass of the wide-character class "graph", the wide-
       character class "alnum" is disjoint from the wide-character class
       "space" and its subclass "blank".

       The wide-character class "alnum" is disjoint from the wide-
       character class "punct".

       The wide-character class "alnum" is the union of the wide-
       character classes "alpha" and "digit".  As such, it also contains
       the wide-character class "xdigit".

       The wide-character class "alnum" always contains at least the
       letters 'A' to 'Z', 'a' to 'z', and the digits '0' to '9'.

RETURN VALUE

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

ATTRIBUTES

       For an explanation of the terms used in this section, see
       attributes(7).
       ┌──────────────────────────────┬───────────────┬────────────────┐
       │ Interface                    │ Attribute     │ Value          │
       ├──────────────────────────────┼───────────────┼────────────────┤
       │ iswalnum()                   │ Thread safety │ MT-Safe locale │
       └──────────────────────────────┴───────────────┴────────────────┘

STANDARDS

       C11, POSIX.1-2008.

HISTORY

       POSIX.1-2001, C99.

NOTES

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

SEE ALSO

       isalnum(3), iswctype(3)

COLOPHON

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Linux man-pages 6.9.1          2024-05-02                    iswalnum(3)

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

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