Originální popis anglicky:
iswalnum - test for alphanumeric wide character
Návod, kniha: Linux Programmer's Manual
#include <wctype.h>
int iswalnum(wint_t wc);
The
iswalnum function is the wide-character equivalent of the
isalnum 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'.
The
iswalnum function returns non-zero if
wc is a wide character
belonging to the wide character class "alnum". Otherwise it returns
zero.
ISO/ANSI C, UNIX98
isalnum(3),
iswctype(3)
The behaviour of
iswalnum depends on the LC_CTYPE category of the current
locale.
