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iswalnum(3) — Linux manual page

NAME \|LIBRARY \|SYNOPSIS \|DESCRIPTION \|RETURN VALUE \|ATTRIBUTES \|STANDARDS \|HISTORY \|NOTES \|SEE ALSO \|COLOPHON

iswalnum(3)              Library Functions Manualiswalnum(3)

NAME top

       iswalnum - test for alphanumeric wide character

LIBRARY top

       Standard C library (libc,-lc)

SYNOPSIS top

#include <wctype.h>int iswalnum(wint_twc);

DESCRIPTION top

       Theiswalnum() function is the wide-character equivalent of theisalnum(3) function.  It tests whetherwc 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 top

       Theiswalnum() function returns nonzero ifwc is a wide character       belonging to the wide-character class "alnum".  Otherwise, it       returns zero.

ATTRIBUTES top

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

STANDARDS top

       C11, POSIX.1-2008.

HISTORY top

       POSIX.1-2001, C99.

NOTES top

       The behavior ofiswalnum() depends on theLC_CTYPEcategory of the       current locale.

COLOPHON top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17iswalnum(3)

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

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