man3/iswalpha.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 ISWALPHA 3  2015-03-02 "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
  32 .I wc
  33 is a wide character
  34 belonging to the wide-character class "alpha".
  35 .PP
  36 The wide-character class "alpha" is a subclass of the
  37 wide-character class "alnum",
  38 and therefore also a subclass of the wide-character class "graph" and
  39 of the wide-character class "print".
  40 .PP
  41 Being a subclass of the wide-character class "print",
  42 the wide-character class
  43 "alpha" is disjoint from the wide-character class "cntrl".
  44 .PP
  45 Being a subclass of the wide-character class "graph",
  46 the wide-character class "alpha" is disjoint from
  47 the wide-character class "space" and its subclass "blank".
  48 .PP
  49 Being a subclass of the wide-character class "alnum",
  50 the wide-character class "alpha" is disjoint from the
  51 wide-character class "punct".
  52 .PP
  53 The wide-character class "alpha" is disjoint from the wide-character class
  54 "digit".
  55 .PP
  56 The wide-character class "alpha" contains the wide-character classes "upper"
  57 and "lower".
  58 .PP
  59 The wide-character class "alpha" always contains at least the
  60 letters \(aqA\(aq to \(aqZ\(aq and \(aqa\(aq to \(aqz\(aq.
  61 .SH RETURN VALUE
  62 The
  63 .BR iswalpha ()
  64 function returns nonzero
  65 if
  66 .I wc
  67 is a wide character
  68 belonging to the wide-character class "alpha".
  69 Otherwise, it returns zero.
  70 .SH ATTRIBUTES
  71 For an explanation of the terms used in this section, see
  72 .BR attributes (7).
  73 .TS
  74 allbox;
  75 lb 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 .SH CONFORMING TO
  83 POSIX.1-2001, POSIX.1-2008, C99.
  84 .SH NOTES
  85 The behavior of
  86 .BR iswalpha ()
  87 depends on the
  88 .B LC_CTYPE
  89 category of the
  90 current locale.
  91 .SH SEE ALSO
  92 .BR isalpha (3),
  93 .BR iswctype (3)