196 lines
5.5 KiB
Groff
196 lines
5.5 KiB
Groff
.\" $OpenBSD: wcsrtombs.3,v 1.5 2013/06/05 03:39:22 tedu Exp $
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.\" $NetBSD: wcsrtombs.3,v 1.6 2003/09/08 17:54:32 wiz Exp $
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.\"
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.\" Copyright (c)2002 Citrus Project,
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd $Mdocdate: June 5 2013 $
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.Dt WCSRTOMBS 3
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.Os
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.\" ----------------------------------------------------------------------
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.Sh NAME
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.Nm wcsrtombs ,
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.Nm wcsnrtombs
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.Nd converts a wide-character string to a multibyte character string \
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(restartable)
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.\" ----------------------------------------------------------------------
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.Sh SYNOPSIS
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.In wchar.h
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.Ft size_t
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.Fn wcsrtombs "const char * restrict dst" "const wchar_t ** restrict src" \
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"size_t len" "mbstate_t * restrict ps"
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.Ft size_t
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.Fn wcsnrtombs "const char * restrict dst" "const wchar_t ** restrict src" \
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"size_t nwc" "size_t len" "mbstate_t * restrict ps"
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.\" ----------------------------------------------------------------------
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.Sh DESCRIPTION
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The
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.Fn wcsrtombs
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function converts the wide-character string indirectly pointed to by
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.Fa src
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to the corresponding multibyte character string
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and stores it to the array pointed to by
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.Fa dst .
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The conversion stops due to the following reasons:
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.Bl -bullet
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.It
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The conversion reaches a null wide character.
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In this case, the null wide character is also converted.
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.It
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The conversion has already stored
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.Fa len
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bytes to the array pointed to by
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.Fa dst .
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.It
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The conversion encounters an invalid character.
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.El
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.Pp
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The
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.Fn wcsnrtombs
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function is equivalent to
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.Fn wcsrtombs
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except that it additionally stops the conversion after processing
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.Fa nwc
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wide characters.
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.Pp
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Each character will be converted as if
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.Xr wcrtomb 3
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is continuously called, except the internal state of
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.Xr wcrtomb 3
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will not be affected.
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.Pp
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After conversion,
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if
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.Fa dst
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is not a null pointer,
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the pointer object pointed to by
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.Fa src
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is a null pointer (if the conversion is stopped due to reaching a null wide character)
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or the address just past the last wide character processed.
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.Pp
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If
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.Fa dst
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is not a null pointer and the conversion is stopped due to reaching
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a null wide character,
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the state object pointed to by
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.Fa ps
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is set to an initial state after the conversion has taken place.
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.Pp
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The behaviour of the
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.Fn wcsrtombs
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and
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.Fn wcsnrtombs
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functions is affected by the
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.Dv LC_CTYPE
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category of the current locale.
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.Pp
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There are two special cases:
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.Bl -tag -width 012345678901
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.It "dst == NULL"
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The conversion takes place, but the resulting multibyte string is discarded.
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In this case, the pointer object pointed to by
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.Fa src
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is not modified and
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.Fa len
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is ignored.
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.It "ps == NULL"
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The
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.Fn wcsrtombs
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and
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.Fn wcsnrtombs
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functions use their own internal state objects to keep the conversion state,
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instead of
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.Fa ps
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as mentioned in this manual page.
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.Pp
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Calling any other functions in
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.Em libc
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never change these internal states,
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which are initialized at startup time of the program.
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.El
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.\" ----------------------------------------------------------------------
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.Sh RETURN VALUES
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The
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.Fn wcsrtombs
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and
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.Fn wcsnrtombs
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functions return:
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.Bl -tag -width 012345678901
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.It 0 or positive
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Number of bytes stored to the array pointed to by
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.Fa dst ,
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except for a null byte.
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There is no cases that the value returned is greater than
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.Fa len
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(unless
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.Fa dst
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is a null pointer).
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If the return value is equal to
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.Fa len ,
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the string pointed to by
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.Fa dst
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will not be null-terminated.
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.It (size_t)-1
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.Fa src
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points to the string containing invalid wide character.
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In this case,
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.Va errno
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is set to indicate the error.
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.El
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.\" ----------------------------------------------------------------------
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.Sh ERRORS
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The
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.Fn wcsrtombs
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and
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.Fn wcsnrtombs
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functions may return the following errors:
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.Bl -tag -width Er
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.It Bq Er EILSEQ
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.Fa src
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points to the string containing an invalid wide character.
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.It Bq Er EINVAL
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.Fa ps
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points to an invalid or uninitialized mbstate_t object.
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.El
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.\" ----------------------------------------------------------------------
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.Sh SEE ALSO
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.Xr setlocale 3 ,
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.Xr wcrtomb 3 ,
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.Xr wcstombs 3
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.\" ----------------------------------------------------------------------
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.Sh STANDARDS
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The
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.Fn wcsrtombs
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function conforms to
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.St -ansiC .
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The restrict qualifier is added at
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.\" .St -isoC99 .
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ISO/IEC 9899/AMD1:1995
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.Pq Dq ISO C99 .
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.Pp
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The
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.Fn wcsnrtombs
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function conforms to
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.St -p1003.1-2008 .
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