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
'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 |
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 4.10 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/.