iswalnum(3)

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

6       iswalnum - test for alphanumeric 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 iswalnum(wint_t wc);
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DESCRIPTION

17       The  iswalnum()  function is the wide-character equivalent of the isal‐
18       num(3) function.  It tests whether wc is a wide character belonging  to
19       the wide-character class "alnum".
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21       The  wide-character  class  "alnum" is a subclass of the wide-character
22       class "graph", and therefore also  a  subclass  of  the  wide-character
23       class "print".
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25       Being  a subclass of the wide-character class "print", the wide-charac‐
26       ter class "alnum" is disjoint from the wide-character class "cntrl".
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28       Being a subclass of the wide-character class "graph", the  wide-charac‐
29       ter class "alnum" is disjoint from the wide-character class "space" and
30       its subclass "blank".
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32       The wide-character class "alnum" is disjoint  from  the  wide-character
33       class "punct".
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35       The  wide-character  class  "alnum"  is the union of the wide-character
36       classes "alpha" and "digit".  As such, it also contains the  wide-char‐
37       acter class "xdigit".
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39       The  wide-character  class "alnum" always contains at least the letters
40       'A' to 'Z', 'a' to 'z', and the digits '0' to '9'.
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RETURN VALUE

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

48       For an  explanation  of  the  terms  used  in  this  section,  see  at‐
49       tributes(7).
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51       ┌─────────────────────────────────────┬───────────────┬────────────────┐
52       │Interface                            │ Attribute     │ Value          │
53       ├─────────────────────────────────────┼───────────────┼────────────────┤
54       │iswalnum()                           │ Thread safety │ MT-Safe locale │
55       └─────────────────────────────────────┴───────────────┴────────────────┘
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STANDARDS

58       C11, POSIX.1-2008.
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HISTORY

61       POSIX.1-2001, C99.
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NOTES

64       The behavior of iswalnum() depends on the LC_CTYPE category of the cur‐
65       rent locale.
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