1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
'\" t
.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
.\"
.\" SPDX-License-Identifier: GPL-2.0-or-later
.\"
.\" References consulted:
.\" GNU glibc-2 source code and manual
.\" Dinkumware C library reference http://www.dinkumware.com/
.\" OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
.\" ISO/IEC 9899:1999
.\"
.TH iswdigit 3 2023-03-30 "Linux man-pages 6.04"
.SH NAME
iswdigit \- test for decimal digit wide character
.SH LIBRARY
Standard C library
.RI ( libc ", " \-lc )
.SH SYNOPSIS
.nf
.B #include <wctype.h>
.PP
.BI "int iswdigit(wint_t " wc );
.fi
.SH DESCRIPTION
The
.BR iswdigit ()
function is the wide-character equivalent of the
.BR isdigit (3)
function.
It tests whether
.I wc
is a wide character
belonging to the wide-character class "digit".
.PP
The wide-character class "digit" is a subclass of the wide-character class
"xdigit", and therefore also a subclass
of the wide-character class "alnum", of
the wide-character class "graph" and of the wide-character class "print".
.PP
Being a subclass of the wide character
class "print", the wide-character class
"digit" is disjoint from the wide-character class "cntrl".
.PP
Being a subclass of the wide-character class "graph",
the wide-character class
"digit" is disjoint from the wide-character class "space" and its subclass
"blank".
.PP
Being a subclass of the wide-character
class "alnum", the wide-character class
"digit" is disjoint from the wide-character class "punct".
.PP
The wide-character class "digit" is
disjoint from the wide-character class
"alpha" and therefore also disjoint from its subclasses "lower", "upper".
.PP
The wide-character class "digit" always
contains exactly the digits \[aq]0\[aq] to \[aq]9\[aq].
.SH RETURN VALUE
The
.BR iswdigit ()
function returns nonzero
if
.I wc
is a wide character
belonging to the wide-character class "digit".
Otherwise, it returns zero.
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.ad l
.nh
.TS
allbox;
lbx lb lb
l l l.
Interface Attribute Value
T{
.BR iswdigit ()
T} Thread safety MT-Safe locale
.TE
.hy
.ad
.sp 1
.SH STANDARDS
C11, POSIX.1-2008.
.SH HISTORY
POSIX.1-2001, C99.
.SH NOTES
The behavior of
.BR iswdigit ()
depends on the
.B LC_CTYPE
category of the
current locale.
.SH SEE ALSO
.BR isdigit (3),
.BR iswctype (3)
|
