iswdigit(3)

1iswdigit(3)                Library Functions Manual                iswdigit(3)
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NAME

6       iswdigit - test for decimal digit wide character
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LIBRARY

9       Standard C library (libc, -lc)
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SYNOPSIS

12       #include <wctype.h>
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14       int iswdigit(wint_t wc);
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DESCRIPTION

17       The  iswdigit()  function  is  the wide-character equivalent of the is‐
18       digit(3) function.  It tests whether wc is a wide  character  belonging
19       to the wide-character class "digit".
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21       The  wide-character  class  "digit" is a subclass of the wide-character
22       class "xdigit", and therefore also a  subclass  of  the  wide-character
23       class  "alnum",  of  the  wide-character class "graph" and of the wide-
24       character class "print".
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26       Being a subclass of the wide character class "print", the  wide-charac‐
27       ter class "digit" is disjoint from the wide-character class "cntrl".
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29       Being  a subclass of the wide-character class "graph", the wide-charac‐
30       ter class "digit" is disjoint from the wide-character class "space" and
31       its subclass "blank".
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33       Being  a subclass of the wide-character class "alnum", the wide-charac‐
34       ter class "digit" is disjoint from the wide-character class "punct".
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36       The wide-character class "digit" is disjoint  from  the  wide-character
37       class  "alpha" and therefore also disjoint from its subclasses "lower",
38       "upper".
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40       The wide-character class "digit" always contains exactly the digits '0'
41       to '9'.
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RETURN VALUE

44       The  iswdigit()  function returns nonzero if wc is a wide character be‐
45       longing to the wide-character class  "digit".   Otherwise,  it  returns
46       zero.
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ATTRIBUTES

49       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
50       tributes(7).
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52       ┌─────────────────────────────────────┬───────────────┬────────────────┐
53       │Interface                            │ Attribute     │ Value          │
54       ├─────────────────────────────────────┼───────────────┼────────────────┤
55       │iswdigit()                           │ Thread safety │ MT-Safe locale │
56       └─────────────────────────────────────┴───────────────┴────────────────┘
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STANDARDS

59       C11, POSIX.1-2008.
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HISTORY

62       POSIX.1-2001, C99.
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NOTES

65       The behavior of iswdigit() depends on  the  LC_CTYPE  category  of  the
66       current locale.
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