iswalnum
Section: C Library Functions (3)
Updated: 2023-02-05
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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
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)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ATTRIBUTES
-
- STANDARDS
-
- NOTES
-
- SEE ALSO
-
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