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.
136 lines
3.4 KiB
Groff
136 lines
3.4 KiB
Groff
.\" Copyright (c) 2002-2004 Tim J. Robbins
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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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.\" $FreeBSD$
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.Dd July 21, 2004
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.Dt MBSRTOWCS 3
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.Os
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.Sh NAME
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.Nm mbsrtowcs ,
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.Nm mbsnrtowcs
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.Nd "convert a character string to a wide-character string (restartable)"
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In wchar.h
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.Ft size_t
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.Fo mbsrtowcs
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.Fa "wchar_t * restrict dst" "const char ** restrict src" "size_t len"
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.Fa "mbstate_t * restrict ps"
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.Fc
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.Ft size_t
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.Fo mbsnrtowcs
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.Fa "wchar_t * restrict dst" "const char ** restrict src" "size_t nms"
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.Fa "size_t len" "mbstate_t * restrict ps"
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.Fc
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.Sh DESCRIPTION
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The
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.Fn mbsrtowcs
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function converts a sequence of multibyte characters pointed to indirectly by
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.Fa src
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into a sequence of corresponding wide characters and stores at most
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.Fa len
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of them in the
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.Vt wchar_t
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array pointed to by
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.Fa dst ,
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until it encounters a terminating null character
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.Pq Li '\e0' .
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.Pp
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If
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.Fa dst
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is
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.Dv NULL ,
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no characters are stored.
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.Pp
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If
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.Fa dst
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is not
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.Dv NULL ,
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the pointer pointed to by
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.Fa src
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is updated to point to the character after the one that conversion stopped at.
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If conversion stops because a null character is encountered,
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.Fa *src
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is set to
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.Dv NULL .
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.Pp
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The
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.Vt mbstate_t
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argument,
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.Fa ps ,
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is used to keep track of the shift state.
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If it is
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.Dv NULL ,
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.Fn mbsrtowcs
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uses an internal, static
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.Vt mbstate_t
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object, which is initialized to the initial conversion state
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at program startup.
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.Pp
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The
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.Fn mbsnrtowcs
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function behaves identically to
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.Fn mbsrtowcs ,
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except that conversion stops after reading at most
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.Fa nms
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bytes from the buffer pointed to by
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.Fa src .
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.Sh RETURN VALUES
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The
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.Fn mbsrtowcs
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and
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.Fn mbsnrtowcs
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functions return the number of wide characters stored in
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the array pointed to by
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.Fa dst
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if successful, otherwise it returns
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.Po Vt size_t Pc Ns \-1 .
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.Sh ERRORS
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The
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.Fn mbsrtowcs
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and
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.Fn mbsnrtowcs
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functions will fail if:
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.Bl -tag -width Er
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.It Bq Er EILSEQ
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An invalid multibyte character sequence was encountered.
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.It Bq Er EINVAL
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The conversion state is invalid.
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.El
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.Sh SEE ALSO
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.Xr mbrtowc 3 ,
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.Xr mbstowcs 3 ,
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.Xr multibyte 3 ,
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.Xr wcsrtombs 3
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.Sh STANDARDS
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The
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.Fn mbsrtowcs
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function conforms to
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.St -isoC-99 .
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.Pp
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The
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.Fn mbsnrtowcs
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function is an extension to the standard.
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