Implement the ISO C90 Amd.1 restartable wide and multibyte character

manipulation functions mbrlen(), mbrtowc(), mbsinit(), mbsrtowcs(),
wcrtomb(), wcsrtombs().

1 files changed, 108 insertions, 0 deletions

diff --git a/lib/libc/locale/wcsrtombs.3 b/lib/libc/locale/wcsrtombs.3
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+++ b/lib/libc/locale/wcsrtombs.3
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+.\" Copyright (c) [year] [your name]
+.\" 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
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+.\"
+.\" $FreeBSD$
+.Dd August 16, 2002
+.Dt WCSRTOMBS 3
+.Os
+.Sh NAME
+.Nm wcsrtombs
+.Nd "convert a wide-character string to a character string (restartable)"
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In wchar.h
+.Ft size_t
+.Fn wcsrtombs "char *restrict dst" "const wchar_t **restrict src" "size_t len" "mbstate_t *restrict ps"
+.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,
+.No * Ns Fa src
+is set to
+.Dv NULL .
+.Pp
+The
+.Ft 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
+.Ft mbstate_t
+object.
+.Sh RETURN VALUES
+The
+.Fn wcsrtombs
+function returns the number of bytes stored in
+the array pointed to by
+.Fa dst
+(not including any terminating null), if successful, otherwise it returns
+.No ( Ns
+.Ft size_t Ns
+.No ) Ns -1 .
+.Sh ERRORS
+The
+.Fn wcsrtombs
+function will fail if:
+.Bl -tag -width Er
+.It Bq Er EILSEQ
+An invalid wide character was encountered.
+.El
+.Sh SEE ALSO
+.Xr mbsrtowcs 3 ,
+.Xr wcstombs 3 ,
+.Xr wcrtomb 3
+.Sh STANDARDS
+The
+.Fn wcsrtombs
+function conforms to
+.St -isoC-99 .
+.Sh BUGS
+The current implementation does not support shift states.