locale/FreeBSD/wctomb.3

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  32 .\" From @(#)multibyte.3        8.1 (Berkeley) 6/4/93
  33 .\" From FreeBSD: src/lib/libc/locale/multibyte.3,v 1.22 2003/11/08 03:23:11 tjr Exp
  34 .\" $FreeBSD: src/lib/libc/locale/wctomb.3,v 1.4 2007/01/09 00:28:01 imp Exp $
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  36 .Dd April 8, 2004
  37 .Dt WCTOMB 3
  38 .Os
  39 .Sh NAME
  40 .Nm wctomb ,
  41 .Nm wctomb_l
  42 .Nd convert a wide-character code to a character
  43 .Sh LIBRARY
  44 .Lb libc
  45 .Sh SYNOPSIS
  46 .In stdlib.h
  47 .Ft int
  48 .Fo wctomb
  49 .Fa "char *s"
  50 .Fa "wchar_t wchar"
  51 .Fc
  52 .In stdlib.h
  53 .In xlocale.h
  54 .Ft int
  55 .Fo wctomb_l
  56 .Fa "char *s"
  57 .Fa "wchar_t wchar"
  58 .Fa "locale_t loc"
  59 .Fc
  60 .Sh DESCRIPTION
  61 The
  62 .Fn wctomb
  63 function converts a wide character,
  64 .Fa wchar ,
  65 into a multibyte character and stores the result in
  66 .Fa s .
  67 The object pointed to by
  68 .Fa s
  69 must be large enough to accommodate the multibyte character,
  70 which may be up to
  71 .Dv MB_LEN_MAX
  72 bytes.
  73 .Pp
  74 A call with a null
  75 .Fa s
  76 pointer returns nonzero if the current locale requires shift states,
  77 zero otherwise;
  78 if shift states are required, the shift state is reset to the initial state.
  79 .Pp
  80 Although the
  81 .Fn wctomb
  82 function uses the current locale, the
  83 .Fn wctomb_l
  84 function may be passed a locale directly. See
  85 .Xr xlocale 3
  86 for more information.
  87 .Sh RETURN VALUES
  88 If
  89 .Fa s
  90 is
  91 .Dv NULL ,
  92 the
  93 .Fn wctomb
  94 function returns nonzero if shift states are supported,
  95 zero otherwise.
  96 If
  97 .Fa s
  98 is valid,
  99 .Fn wctomb
 100 returns
 101 the number of bytes processed in
 102 .Fa s ,
 103 or \-1 if no multibyte character
 104 could be recognized or converted.
 105 In this case,
 106 .Fn wctomb Ns 's
 107 internal conversion state is undefined.
 108 .Sh ERRORS
 109 The
 110 .Fn wctomb
 111 function will fail if:
 112 .Bl -tag -width Er
 113 .It Bq Er EILSEQ
 114 An invalid multibyte sequence was detected.
 115 .It Bq Er EINVAL
 116 The internal conversion state is invalid.
 117 .El
 118 .Sh SEE ALSO
 119 .Xr mbtowc 3 ,
 120 .Xr wcrtomb 3 ,
 121 .Xr wcstombs 3 ,
 122 .Xr wctob 3 ,
 123 .Xr xlocale 3
 124 .Sh STANDARDS
 125 The
 126 .Fn wctomb
 127 function conforms to
 128 .St -isoC-99 .