locale/FreeBSD/wctype.3

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  25 .\" $FreeBSD: src/lib/libc/locale/wctype.3,v 1.4 2002/11/29 17:35:09 ru Exp $
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  27 .Dd October 3, 2002
  28 .Dt WCTYPE 3
  29 .Os
  30 .Sh NAME
  31 .Nm iswctype , wctype
  32 .Nd "wide character class functions"
  33 .Sh LIBRARY
  34 .Lb libc
  35 .Sh SYNOPSIS
  36 .In wctype.h
  37 .Ft int
  38 .Fn iswctype "wint_t wc" "wctype_t charclass"
  39 .Ft wctype_t
  40 .Fn wctype "const char *property"
  41 .Sh DESCRIPTION
  42 The
  43 .Fn wctype
  44 function returns a value of type
  45 .Vt wctype_t
  46 which represents the requested wide character class and
  47 may be used as the second argument for calls to
  48 .Fn iswctype .
  49 .Pp
  50 The following character class names are recognised:
  51 .Bl -column -offset indent ".Li alnum" ".Li cntrl" ".Li phonogram" ".Li print" ".Li special"
  52 .It Li "alnum   cntrl   ideogram        print   special"
  53 .It Li "alpha   digit   lower   punct   upper"
  54 .It Li "blank   graph   phonogram       space   xdigit"
  55 .El
  56 .Pp
  57 The
  58 .Fn iswctype
  59 function checks whether the wide character
  60 .Fa wc
  61 is in the character class
  62 .Fa charclass .
  63 .Sh RETURN VALUES
  64 The
  65 .Fn iswctype
  66 function returns non-zero if and only if
  67 .Fa wc
  68 has the property described by
  69 .Fa charclass ,
  70 or
  71 .Fa charclass
  72 is zero.
  73 .Pp
  74 The
  75 .Fn wctype
  76 function returns 0 if
  77 .Fa property
  78 is invalid, otherwise it returns a value of type
  79 .Vt wctype_t
  80 that can be used in subsequent calls to
  81 .Fn iswctype .
  82 .Sh EXAMPLES
  83 Reimplement
  84 .Xr iswalpha 3
  85 in terms of
  86 .Fn iswctype
  87 and
  88 .Fn wctype :
  89 .Bd -literal -offset indent
  90 int
  91 myiswalpha(wint_t wc)
  92 {
  93         return (iswctype(wc, wctype("alpha")));
  94 }
  95 .Ed
  96 .Sh SEE ALSO
  97 .Xr ctype 3
  98 .Sh STANDARDS
  99 The
 100 .Fn iswctype
 101 and
 102 .Fn wctype
 103 functions conform to
 104 .St -p1003.1-2001 .
 105 The
 106 .Dq Li ideogram ,
 107 .Dq Li phonogram
 108 and
 109 .Dq Li special
 110 character classes are extensions.
 111 .Sh HISTORY
 112 The
 113 .Fn iswctype
 114 and
 115 .Fn wctype
 116 functions first appeared in
 117 .Fx 5.0 .