locale/FreeBSD/wcrtomb.3

   1 .\" Copyright (c) 2002 Tim J. Robbins
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  27 .Dd August 15, 2002
  28 .Dt WCRTOMB 3
  29 .Os
  30 .Sh NAME
  31 .Nm wcrtomb
  32 .Nd "convert a wide-character code to a character (restartable)"
  33 .Sh LIBRARY
  34 .Lb libc
  35 .Sh SYNOPSIS
  36 .In wchar.h
  37 .Ft size_t
  38 .Fn wcrtomb "char * restrict s" "wchar_t wc" "mbstate_t * restrict ps"
  39 .Sh DESCRIPTION
  40 The
  41 .Fn wcrtomb
  42 function stores a multibyte sequence representing the
  43 wide character
  44 .Fa wc ,
  45 including any necessary shift sequences, to the
  46 character array
  47 .Fa s ,
  48 storing a maximum of
  49 .Dv MB_CUR_MAX
  50 bytes.
  51 .Pp
  52 If
  53 .Fa s
  54 is
  55 .Dv NULL ,
  56 .Fn wcrtomb
  57 behaves as if
  58 .Fa s
  59 pointed to an internal buffer and
  60 .Fa wc
  61 was a null wide character (L'\e0').
  62 .Pp
  63 The
  64 .Ft mbstate_t
  65 argument,
  66 .Fa ps ,
  67 is used to keep track of the shift state.
  68 If it is
  69 .Dv NULL ,
  70 .Fn wcrtomb
  71 uses an internal, static
  72 .Vt mbstate_t
  73 object.
  74 .Sh RETURN VALUES
  75 The
  76 .Fn wcrtomb
  77 functions returns the length (in bytes) of the multibyte sequence
  78 needed to represent
  79 .Fa wc ,
  80 or
  81 .Po Vt size_t Pc Ns \-1
  82 if
  83 .Fa wc
  84 is not a valid wide character code.
  85 .Sh ERRORS
  86 The
  87 .Fn wcrtomb
  88 function will fail if:
  89 .Bl -tag -width Er
  90 .\".It Bq Er EINVAL
  91 .\"Invalid argument.
  92 .It Bq Er EILSEQ
  93 An invalid wide character code was specified.
  94 .El
  95 .Sh SEE ALSO
  96 .Xr mbrtowc 3 ,
  97 .Xr setlocale 3 ,
  98 .Xr wctomb 3
  99 .Sh STANDARDS
 100 The
 101 .Fn wcrtomb
 102 function conforms to
 103 .St -isoC-99 .
 104 .Sh BUGS
 105 The current implementation does not support shift states.