locale/FreeBSD/wctrans.3

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  25 .\" $FreeBSD: src/lib/libc/locale/wctrans.3,v 1.3 2002/11/29 17:35:09 ru Exp $
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  27 .Dd October 3, 2002
  28 .Dt WCTRANS 3
  29 .Os
  30 .Sh NAME
  31 .Nm towctrans , wctrans
  32 .Nd "wide character mapping functions"
  33 .Sh LIBRARY
  34 .Lb libc
  35 .Sh SYNOPSIS
  36 .In wctype.h
  37 .Ft wint_t
  38 .Fn towctrans "wint_t wc" "wctrans_t desc"
  39 .Ft wctrans_t
  40 .Fn wctrans "const char *charclass"
  41 .Sh DESCRIPTION
  42 The
  43 .Fn wctrans
  44 function returns a value of type
  45 .Vt wctrans_t
  46 which represents the requested wide character mapping operation and
  47 may be used as the second argument for calls to
  48 .Fn towctrans .
  49 .Pp
  50 The following character mapping names are recognised:
  51 .Bl -column -offset indent ".Li tolower" ".Li toupper"
  52 .It Li "tolower toupper"
  53 .El
  54 .Pp
  55 The
  56 .Fn towctrans
  57 function transliterates the wide character
  58 .Fa wc
  59 according to the mapping described by
  60 .Fa desc .
  61 .Sh RETURN VALUES
  62 The
  63 .Fn towctrans
  64 function returns the transliterated character if successful, otherwise
  65 it returns the character unchanged and sets
  66 .Va errno .
  67 .Pp
  68 The
  69 .Fn wctrans
  70 function returns non-zero if successful, otherwise it returns zero
  71 and sets
  72 .Va errno .
  73 .Sh EXAMPLES
  74 Reimplement
  75 .Fn towupper
  76 in terms of
  77 .Fn towctrans
  78 and
  79 .Fn wctrans :
  80 .Bd -literal -offset indent
  81 wint_t
  82 mytowupper(wint_t wc)
  83 {
  84         return (towctrans(wc, wctrans("toupper")));
  85 }
  86 .Ed
  87 .Sh ERRORS
  88 The
  89 .Fn towctrans
  90 function will fail if:
  91 .Bl -tag -width Er
  92 .It Bq Er EINVAL
  93 The supplied
  94 .Fa desc
  95 argument is invalid.
  96 .El
  97 .Pp
  98 The
  99 .Fn wctrans
 100 function will fail if:
 101 .Bl -tag -width Er
 102 .It Bq Er EINVAL
 103 The requested mapping name is invalid.
 104 .El
 105 .Sh SEE ALSO
 106 .Xr tolower 3 ,
 107 .Xr toupper 3 ,
 108 .Xr wctype 3
 109 .Sh STANDARDS
 110 The
 111 .Fn towctrans
 112 and
 113 .Fn wctrans
 114 functions conform to
 115 .St -p1003.1-2001 .
 116 .Sh HISTORY
 117 The
 118 .Fn towctrans
 119 and
 120 .Fn wctrans
 121 functions first appeared in
 122 .Fx 5.0 .