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iswalnum(3) Library Functions Manual iswalnum(3)
iswalnum - test for alphanumeric wide character
Standard C library (libc, -lc)
#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). ┌──────────────────────────────┬───────────────┬────────────────┐ │ Interface │ Attribute │ Value │ ├──────────────────────────────┼───────────────┼────────────────┤ │ iswalnum() │ Thread safety │ MT-Safe locale │ └──────────────────────────────┴───────────────┴────────────────┘
C11, POSIX.1-2008.
POSIX.1-2001, C99.
The behavior of iswalnum() depends on the LC_CTYPE category of the current locale.
isalnum(3), iswctype(3)
Linux man-pages (unreleased) (date) iswalnum(3)
Pages that refer to this page: isalpha(3), iswctype(3)