iswxdigit(3) Library Functions Manual iswxdigit(3)

iswxdigit - test for hexadecimal digit wide character

Standard C library (libc, -lc)

#include <wctype.h>
int iswxdigit(wint_t wc);

The iswxdigit() function is the wide-character equivalent of the isxdigit(3) function. It tests whether wc is a wide character belonging to the wide-character class "xdigit".

The wide-character class "xdigit" 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 "xdigit" is disjoint from the wide-character class "cntrl".

Being a subclass of the wide-character class "graph", the wide-character class "xdigit" 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 "xdigit" is disjoint from the wide-character class "punct".

The wide-character class "xdigit" always contains at least the letters 'A' to 'F', 'a' to 'f' and the digits '0' to '9'.

The iswxdigit() function returns nonzero if wc is a wide character belonging to the wide-character class "xdigit". Otherwise, it returns zero.

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

Interface Attribute Value
iswxdigit () Thread safety MT-Safe locale

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

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

iswctype(3), isxdigit(3)

2023-02-05 Linux man-pages 6.03