Manpages - iswalnum.3

iswalnum - test for alphanumeric wide character

  #include <wctype.h>

  int iswalnum(wint_t wc);

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’.

The *iswalnum*() function returns nonzero if wc is a wide character belonging to the wide-character class “alnum”. Otherwise, it returns zero.

For an explanation of the terms used in this section, see *attributes*(7).

POSIX.1-2001, POSIX.1-2008, C99.

The behavior of iswalnum*() depends on the *LC_CTYPE category of the current locale.

*isalnum*(3), *iswctype*(3)

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