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freebsd/lib/libc/locale/wcrtomb.3

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.\" Copyright (c) 2002-2004 Tim J. Robbins
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.Dd April 8, 2004
.Dt WCRTOMB 3
.Os
.Sh NAME
.Nm wcrtomb
.Nd "convert a wide-character code to a character (restartable)"
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In wchar.h
.Ft size_t
.Fn wcrtomb "char * restrict s" "wchar_t wc" "mbstate_t * restrict ps"
.Sh DESCRIPTION
The
.Fn wcrtomb
function stores a multibyte sequence representing the
wide character
.Fa wc ,
including any necessary shift sequences, to the
character array
.Fa s ,
storing a maximum of
.Dv MB_CUR_MAX
bytes.
.Pp
If
.Fa s
is
.Dv NULL ,
.Fn wcrtomb
behaves as if
.Fa s
pointed to an internal buffer and
.Fa wc
was a null wide character (L'\e0').
.Pp
The
.Ft mbstate_t
argument,
.Fa ps ,
is used to keep track of the shift state.
If it is
.Dv NULL ,
.Fn wcrtomb
uses an internal, static
.Vt mbstate_t
object, which is initialized to the initial conversion state
at program startup.
.Sh RETURN VALUES
The
.Fn wcrtomb
functions returns the length (in bytes) of the multibyte sequence
needed to represent
.Fa wc ,
or
.Po Vt size_t Pc Ns \-1
if
.Fa wc
is not a valid wide character code.
.Sh ERRORS
The
.Fn wcrtomb
function will fail if:
.Bl -tag -width Er
.It Bq Er EILSEQ
An invalid wide character code was specified.
.It Bq Er EINVAL
The conversion state is invalid.
.El
.Sh SEE ALSO
.Xr mbrtowc 3 ,
.Xr multibyte 3 ,
.Xr setlocale 3 ,
.Xr wctomb 3
.Sh STANDARDS
The
.Fn wcrtomb
function conforms to
.St -isoC-99 .