iswalnum(3) Library Functions Manual iswalnum(3) NAME iswalnum - test for alphanumeric wide character LIBRARY Standard C library (libc, -lc) SYNOPSIS #include <wctype.h> int iswalnum(wint_t wc); DESCRIPTION The iswalnum() function is the wide-character equivalent of the isal- num(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-charac- ter class "alnum" is disjoint from the wide-character class "cntrl". Being a subclass of the wide-character class "graph", the wide-charac- ter 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-char- acter 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'. RETURN VALUE The iswalnum() function returns nonzero if wc is a wide character be- longing to the wide-character class "alnum". Otherwise, it returns zero. ATTRIBUTES For an explanation of the terms used in this section, see at- tributes(7). ┌─────────────────────────────────────┬───────────────┬────────────────┐ │Interface │ Attribute │ Value │ ├─────────────────────────────────────┼───────────────┼────────────────┤ │iswalnum() │ Thread safety │ MT-Safe locale │ └─────────────────────────────────────┴───────────────┴────────────────┘ STANDARDS POSIX.1-2001, POSIX.1-2008, C99. NOTES The behavior of iswalnum() depends on the LC_CTYPE category of the cur- rent locale. SEE ALSO isalnum(3), iswctype(3) Linux man-pages 6.03 2023-02-05 iswalnum(3)
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