Section (3) iswalnum


Linux manual pages Section 3  

Name

iswalnum — test for alphanumeric wide character

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 _zsingle_quotesz_A_zsingle_quotesz_ to _zsingle_quotesz_Z_zsingle_quotesz_, _zsingle_quotesz_a_zsingle_quotesz_ to _zsingle_quotesz_z_zsingle_quotesz_ and the digits _zsingle_quotesz_0_zsingle_quotesz_ to _zsingle_quotesz_9_zsingle_quotesz_.

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

CONFORMING TO

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

NOTES

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

SEE ALSO

isalnum(3), iswctype(3)

COLOPHON

This page is part of release 4.16 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/.


  Copyright (c) Bruno Haible <haibleclisp.cons.org>

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References consulted:
  GNU glibc-2 source code and manual
  Dinkumware C library reference http://www.dinkumware.com/
  OpenGroup_zsingle_quotesz_s Single UNIX specification http://www.UNIX-systems.org/online.html
  ISO/IEC 9899:1999