iswalpha - test for alphabetic wide character
Standard C library (
libc,
-lc)
#include <wctype.h>
int iswalpha(wint_t wc);
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'.
The
iswalpha() function returns nonzero if
wc is a wide character
belonging to the wide-character class "alpha". Otherwise, it returns
zero.
For an explanation of the terms used in this section, see
attributes(7).
Interface |
Attribute |
Value |
iswalpha () |
Thread safety |
MT-Safe locale |
POSIX.1-2001, POSIX.1-2008, C99.
The behavior of
iswalpha() depends on the
LC_CTYPE category of the
current locale.
isalpha(3),
iswctype(3)