man3/iswalnum.3

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