ISWALPHA
Section: Linux Programmer's Manual (3)
Updated: 2021-03-22
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NAME
iswalpha - test for alphabetic wide character
SYNOPSIS
#include <wctype.h>
int iswalpha(wint_t wc);
DESCRIPTION
The
iswalpha()
function is the wide-character equivalent of the
isalpha(3)
function.
It tests whether
wc
is a wide character
belonging to the wide-character class "alpha".
The wide-character class "alpha" is a subclass of the
wide-character class "alnum",
and therefore also a subclass of the wide-character class "graph" and
of the wide-character class "print".
Being a subclass of the wide-character class "print",
the wide-character class
"alpha" is disjoint from the wide-character class "cntrl".
Being a subclass of the wide-character class "graph",
the wide-character class "alpha" is disjoint from
the wide-character class "space" and its subclass "blank".
Being a subclass of the wide-character class "alnum",
the wide-character class "alpha" is disjoint from the
wide-character class "punct".
The wide-character class "alpha" is disjoint from the wide-character class
"digit".
The wide-character class "alpha" contains the wide-character classes "upper"
and "lower".
The wide-character class "alpha" always contains at least the
letters 'A' to 'Z' and 'a' to 'z'.
RETURN VALUE
The
iswalpha()
function returns nonzero
if
wc
is a wide character
belonging to the wide-character class "alpha".
Otherwise, it returns zero.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
iswalpha()
| Thread safety | MT-Safe locale
|
CONFORMING TO
POSIX.1-2001, POSIX.1-2008, C99.
NOTES
The behavior of
iswalpha()
depends on the
LC_CTYPE
category of the
current locale.
SEE ALSO
isalpha(3),
iswctype(3)
COLOPHON
This page is part of release 5.11 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/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ATTRIBUTES
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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Time: 06:22:48 GMT, May 09, 2021