man3/iswalnum.3

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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
  14 .\"   ISO/IEC 9899:1999
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  16 .TH ISWALNUM 3  2015-08-08 "GNU" "Linux Programmer's Manual"
  17 .SH NAME
  18 iswalnum \- test for alphanumeric wide character
  19 .SH SYNOPSIS
  20 .nf
  21 .B #include <wctype.h>
  22 .PP
  23 .BI "int iswalnum(wint_t " wc );
  24 .fi
  25 .SH DESCRIPTION
  26 The
  27 .BR iswalnum ()
  28 function is the wide-character equivalent of the
  29 .BR isalnum (3)
  30 function.
  31 It tests whether
  32 .I wc
  33 is a wide character
  34 belonging to the wide-character class "alnum".
  35 .PP
  36 The wide-character class "alnum" is a subclass of the wide-character class
  37 "graph", and therefore also a subclass of the wide-character class "print".
  38 .PP
  39 Being a subclass of the wide-character class "print",
  40 the wide-character class
  41 "alnum" is disjoint from the wide-character class "cntrl".
  42 .PP
  43 Being a subclass of the wide-character class "graph",
  44 the wide-character class "alnum" is disjoint from
  45 the wide-character class "space" and its subclass "blank".
  46 .PP
  47 The wide-character class "alnum" is disjoint from the wide-character class
  48 "punct".
  49 .PP
  50 The wide-character class "alnum" is the union of the wide-character classes
  51 "alpha" and "digit".
  52 As such, it also contains the wide-character class
  53 "xdigit".
  54 .PP
  55 The wide-character class "alnum" always contains at least the letters \(aqA\(aq
  56 to \(aqZ\(aq, \(aqa\(aq to \(aqz\(aq and the digits \(aq0\(aq to \(aq9\(aq.
  57 .SH RETURN VALUE
  58 The
  59 .BR iswalnum ()
  60 function returns nonzero
  61 if
  62 .I wc
  63 is a wide character
  64 belonging to the wide-character class "alnum".
  65 Otherwise, it returns zero.
  66 .SH ATTRIBUTES
  67 For an explanation of the terms used in this section, see
  68 .BR attributes (7).
  69 .TS
  70 allbox;
  71 lb lb lb
  72 l l l.
  73 Interface       Attribute       Value
  74 T{
  75 .BR iswalnum ()
  76 T}      Thread safety   MT-Safe locale
  77 .TE
  78 .SH CONFORMING TO
  79 POSIX.1-2001, POSIX.1-2008, C99.
  80 .SH NOTES
  81 The behavior of
  82 .BR iswalnum ()
  83 depends on the
  84 .B LC_CTYPE
  85 category of the
  86 current locale.
  87 .SH SEE ALSO
  88 .BR isalnum (3),
  89 .BR iswctype (3)