man3/iswalpha.3

   1 .\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
   2 .\"
   3 .\" SPDX-License-Identifier: GPL-2.0-or-later
   4 .\"
   5 .\" References consulted:
   6 .\"   GNU glibc-2 source code and manual
   7 .\"   Dinkumware C library reference http://www.dinkumware.com/
   8 .\"   OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
   9 .\"   ISO/IEC 9899:1999
  10 .\"
  11 .TH ISWALPHA 3  2021-03-22 "Linux man-pages (unreleased)"
  12 .SH NAME
  13 iswalpha \- test for alphabetic wide character
  14 .SH LIBRARY
  15 Standard C library
  16 .RI ( libc ", " \-lc )
  17 .SH SYNOPSIS
  18 .nf
  19 .B #include <wctype.h>
  20 .PP
  21 .BI "int iswalpha(wint_t " wc );
  22 .fi
  23 .SH DESCRIPTION
  24 The
  25 .BR iswalpha ()
  26 function is the wide-character equivalent of the
  27 .BR isalpha (3)
  28 function.
  29 It tests whether
  30 .I wc
  31 is a wide character
  32 belonging to the wide-character class "alpha".
  33 .PP
  34 The wide-character class "alpha" is a subclass of the
  35 wide-character class "alnum",
  36 and therefore also a subclass of the wide-character class "graph" and
  37 of the wide-character class "print".
  38 .PP
  39 Being a subclass of the wide-character class "print",
  40 the wide-character class
  41 "alpha" 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 "alpha" is disjoint from
  45 the wide-character class "space" and its subclass "blank".
  46 .PP
  47 Being a subclass of the wide-character class "alnum",
  48 the wide-character class "alpha" is disjoint from the
  49 wide-character class "punct".
  50 .PP
  51 The wide-character class "alpha" is disjoint from the wide-character class
  52 "digit".
  53 .PP
  54 The wide-character class "alpha" contains the wide-character classes "upper"
  55 and "lower".
  56 .PP
  57 The wide-character class "alpha" always contains at least the
  58 letters \(aqA\(aq to \(aqZ\(aq and \(aqa\(aq to \(aqz\(aq.
  59 .SH RETURN VALUE
  60 The
  61 .BR iswalpha ()
  62 function returns nonzero
  63 if
  64 .I wc
  65 is a wide character
  66 belonging to the wide-character class "alpha".
  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 .ad l
  72 .nh
  73 .TS
  74 allbox;
  75 lbx lb lb
  76 l l l.
  77 Interface       Attribute       Value
  78 T{
  79 .BR iswalpha ()
  80 T}      Thread safety   MT-Safe locale
  81 .TE
  82 .hy
  83 .ad
  84 .sp 1
  85 .SH STANDARDS
  86 POSIX.1-2001, POSIX.1-2008, C99.
  87 .SH NOTES
  88 The behavior of
  89 .BR iswalpha ()
  90 depends on the
  91 .B LC_CTYPE
  92 category of the
  93 current locale.
  94 .SH SEE ALSO
  95 .BR isalpha (3),
  96 .BR iswctype (3)