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ISWALPHA(3) Linux Programmer's Manual ISWALPHA(3)
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 isal-
pha(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-charac-
ter class "alpha" is disjoint from the wide-character class "cntrl".
Being a subclass of the wide-character class "graph", the wide-charac-
ter 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-charac-
ter 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
Multithreading (see pthreads(7))
The iswalpha() function is thread-safe with exceptions. It can be
safely used in multithreaded applications, as long as setlocale(3) is
not called to change the locale during its execution.
CONFORMING TO
C99.
NOTES
The behavior of iswalpha() depends on the LC_CTYPE category of the cur-
rent locale.
SEE ALSO
isalpha(3), iswctype(3)
COLOPHON
This page is part of release 3.69 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
http://www.kernel.org/doc/man-pages/.
GNU 2014-01-28 ISWALPHA(3)
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