1 .\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
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10 .\" References consulted:
11 .\" GNU glibc-2 source code and manual
12 .\" Dinkumware C library reference http://www.dinkumware.com/
13 .\" OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
16 .TH ISWXDIGIT 3 2021-03-22 "GNU" "Linux Programmer's Manual"
18 iswxdigit \- test for hexadecimal digit wide character
21 .B #include <wctype.h>
23 .BI "int iswxdigit(wint_t " wc );
28 function is the wide-character equivalent of the
34 belonging to the wide-character class "xdigit".
36 The wide-character class "xdigit" is a subclass of the wide-character class
37 "alnum", and therefore also a subclass of the wide-character class "graph" and
38 of the wide-character class "print".
40 Being a subclass of the wide-character class "print", the wide-character class
41 "xdigit" is disjoint from the wide-character class "cntrl".
43 Being a subclass of the wide-character class "graph", the wide-character class
44 "xdigit" is disjoint from the wide-character class "space" and its subclass
47 Being a subclass of the wide-character class "alnum", the wide-character class
48 "xdigit" is disjoint from the wide-character class "punct".
50 The wide-character class "xdigit" always contains at least the
51 letters \(aqA\(aq to \(aqF\(aq, \(aqa\(aq to \(aqf\(aq
52 and the digits \(aq0\(aq to \(aq9\(aq.
56 function returns nonzero if
59 belonging to the wide-character class "xdigit".
60 Otherwise, it returns zero.
62 For an explanation of the terms used in this section, see
70 Interface Attribute Value
73 T} Thread safety MT-Safe locale
79 POSIX.1-2001, POSIX.1-2008, C99.