1949a3470f
convenient when the source string isn't null-terminated. Implement the other conversion functions (mbstowcs(), mbsrtowcs(), wcstombs(), wcsrtombs()) in terms of these new functions.
135 lines
3.4 KiB
Groff
135 lines
3.4 KiB
Groff
.\" Copyright (c) 2002-2004 Tim J. Robbins
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd July 21, 2004
|
|
.Dt WCSRTOMBS 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm wcsrtombs ,
|
|
.Nm wcsnrtombs
|
|
.Nd "convert a wide-character string to a character string (restartable)"
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In wchar.h
|
|
.Ft size_t
|
|
.Fo wcsrtombs
|
|
.Fa "char * restrict dst" "const wchar_t ** restrict src"
|
|
.Fa "size_t len" "mbstate_t * restrict ps"
|
|
.Fc
|
|
.Ft size_t
|
|
.Fo wcsnrtombs
|
|
.Fa "char * restrict dst" "const wchar_t ** restrict src" "size_t nwc"
|
|
.Fa "size_t len" "mbstate_t * restrict ps"
|
|
.Fc
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn wcsrtombs
|
|
function converts a string of wide characters indirectly pointed to by
|
|
.Fa src
|
|
to a corresponding multibyte character string stored in the array
|
|
pointed to by
|
|
.Fa dst .
|
|
No more than
|
|
.Fa len
|
|
bytes are written to
|
|
.Fa dst .
|
|
.Pp
|
|
If
|
|
.Fa dst
|
|
is
|
|
.Dv NULL ,
|
|
no characters are stored.
|
|
.Pp
|
|
If
|
|
.Fa dst
|
|
is not
|
|
.Dv NULL ,
|
|
the pointer pointed to by
|
|
.Fa src
|
|
is updated to point to the character after the one that conversion stopped at.
|
|
If conversion stops because a null character is encountered,
|
|
.Fa *src
|
|
is set to
|
|
.Dv NULL .
|
|
.Pp
|
|
The
|
|
.Vt mbstate_t
|
|
argument,
|
|
.Fa ps ,
|
|
is used to keep track of the shift state.
|
|
If it is
|
|
.Dv NULL ,
|
|
.Fn wcsrtombs
|
|
uses an internal, static
|
|
.Vt mbstate_t
|
|
object, which is initialized to the initial conversion state
|
|
at program startup.
|
|
.Pp
|
|
The
|
|
.Fn wcsnrtombs
|
|
function behaves identically to
|
|
.Fn wcsrtombs ,
|
|
except that conversion stops after reading at most
|
|
.Fa nwc
|
|
characters from the buffer pointed to by
|
|
.Fa src .
|
|
.Sh RETURN VALUES
|
|
The
|
|
.Fn wcsrtombs
|
|
and
|
|
.Fn wcsnrtombs
|
|
functions return the number of bytes stored in
|
|
the array pointed to by
|
|
.Fa dst
|
|
(not including any terminating null), if successful, otherwise it returns
|
|
.Po Vt size_t Pc Ns \-1 .
|
|
.Sh ERRORS
|
|
The
|
|
.Fn wcsrtombs
|
|
and
|
|
.Fn wcsnrtombs
|
|
functions will fail if:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EILSEQ
|
|
An invalid wide character was encountered.
|
|
.It Bq Er EINVAL
|
|
The conversion state is invalid.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr mbsrtowcs 3 ,
|
|
.Xr wcrtomb 3 ,
|
|
.Xr wcstombs 3
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn wcsrtombs
|
|
function conforms to
|
|
.St -isoC-99 .
|
|
.Pp
|
|
The
|
|
.Fn wcsnrtombs
|
|
function is an extension to the standard.
|