man3/iswalpha.3

   1 .\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
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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
  15 .\"
  16 .TH ISWALPHA 3  1999-07-25 "GNU" "Linux Programmer's Manual"
  17 .SH NAME
  18 iswalpha \- test for alphabetic wide character
  19 .SH SYNOPSIS
  20 .nf
  21 .B #include <wctype.h>
  22 .sp
  23 .BI "int iswalpha(wint_t " wc );
  24 .fi
  25 .SH DESCRIPTION
  26 The
  27 .BR iswalpha ()
  28 function is the wide-character equivalent of the
  29 .BR isalpha (3)
  30 function.
  31 It tests whether \fIwc\fP 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 \fIwc\fP is a wide character
  64 belonging to the wide-character class "alpha".
  65 Otherwise it returns zero.
  66 .SH CONFORMING TO
  67 C99.
  68 .SH NOTES
  69 The behavior of
  70 .BR iswalpha ()
  71 depends on the
  72 .B LC_CTYPE
  73 category of the
  74 current locale.
  75 .SH SEE ALSO
  76 .BR isalpha (3),
  77 .BR iswctype (3)