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.\"
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.\" Portions of this text are reprinted and reproduced in electronic form
.\" in the SunOS Reference Manual, from IEEE Std 1003.1, 2004 Edition,
.\" Standard for Information Technology -- Portable Operating System
.\" Interface (POSIX), The Open Group Base Specifications Issue 6,
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.\" between these versions and the original IEEE and The Open Group
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.\" document. The original Standard can be obtained online at
.\" http://www.opengroup.org/unix/online.html.
.\"
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.\"
.\" The contents of this file are subject to the terms of the
.\" Common Development and Distribution License (the "License").
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.\" If applicable, add the following below this CDDL HEADER, with the
.\" fields enclosed by brackets "[]" replaced with your own identifying
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.\" Copyright (c) 1992, X/Open Company Limited. All Rights Reserved.
.\" Portions Copyright (c) 2003, Sun Microsystems, Inc. All Rights Reserved.
.\" Copyright 2014 Garrett D'Amore <garrett@damore.org>
.\"
.TH WCSRTOMBS 3C "Jul 13, 2014"
.SH NAME
wcsnrtombs, wcsnrtombs_l, wcsrtombs, wcsrtombs_l \- convert a wide-character string to a character string
(restartable)
.SH SYNOPSIS
.LP
.nf
#include <wchar.h>
\fBsize_t\fR \fBwcsrtombs\fR(\fBchar *restrict\fR \fIdst\fR, \fBconst wchar_t **restrict\fR \fIsrc\fR,
\fBsize_t\fR \fIlen\fR, \fBmbstate_t *restrict\fR \fIps\fR);
.fi
.LP
.nf
\fBsize_t\fR \fBwcsnrtombs\fR(\fBchar *restrict\fR \fIdst\fR, \fBconst wchar_t **restrict\fR \fIsrc\fR,
\fBsize_t\fR \fInwc\fR, \fBsize_t\fR \fIlen\fR, \fBmbstate_t *restrict\fR \fIps\fR);
.fi
.LP
.nf
#include <wchar.h>
#include <xlocale.h>
\fBsize_t\fR \fBwcsrtombs_l\fR(\fBchar *restrict\fR \fIdst\fR, \fBconst wchar_t **restrict\fR \fIsrc\fR,
\fBsize_t\fR \fIlen\fR, \fBmbstate_t *restrict\fR \fIps\fR, \fBlocale_t\fR \fIloc\fR);
.fi
.LP
.nf
\fBsize_t\fR \fBwcsnrtombs_l\fR(\fBchar *restrict\fR \fIdst\fR, \fBconst wchar_t **restrict\fR \fIsrc\fR,
\fBsize_t\fR \fInwc\fR, \fBsize_t\fR \fIlen\fR, \fBmbstate_t *restrict\fR \fIps\fR, \fBlocale_t\fR \fIloc\fR);
.fi
.SH DESCRIPTION
.LP
The \fBwcsrtombs()\fR function converts a sequence of wide-characters from the
array indirectly pointed to by \fIsrc\fR into a sequence of corresponding
characters, beginning in the conversion state described by the object pointed
to by \fIps\fR. If \fIdst\fR is not a null pointer, the converted characters
are then stored into the array pointed to by \fIdst\fR. Conversion continues up
to and including a terminating null wide-character, which is also stored.
Conversion stops earlier in the following cases:
.RS +4
.TP
.ie t \(bu
.el o
When a code is reached that does not correspond to a valid character.
.RE
.RS +4
.TP
.ie t \(bu
.el o
When the next character would exceed the limit of \fIlen\fR total bytes to be
stored in the array pointed to by \fIdst\fR (and \fIdst\fR is not a null
pointer).
.RE
.RS +4
.TP
.ie t \(bu
.el o
In the case of \fBwcsnrtombs()\fR and \fBwcsnrtombs_l()\fR, when \fInwc\fR
wide characters have been completely converted.
.RE
.LP
Each conversion takes place as if by a call to the \fBwcrtomb()\fR function.
.LP
If \fIdst\fR is not a null pointer, the pointer object pointed to by \fIsrc\fR
is assigned either a null pointer (if conversion stopped due to reaching a
terminating null wide-character) or the address just past the last
wide-character converted (if any). If conversion stopped due to reaching a
terminating null wide-character, the resulting state described is the initial
conversion state.
.LP
If \fIps\fR is a null pointer, these functions uses their own
internal \fBmbstate_t\fR object, which is initialized at program startup to the
initial conversion state. Otherwise, the \fBmbstate_t\fR object pointed to by
\fIps\fR is used to completely describe the current conversion state of the
associated character sequence. The system will behave as if no function defined
in the Reference Manual calls any of these functions.
.LP
The behavior of \fBwcsrtombs()\fR and \fBwcsnrtombs()\fR are affected by the
\fBLC_CTYPE\fR category of the current locale. See \fBenviron\fR(5).
.LP
The \fBwcsrtombs_l()\fR and \fBwcsnrtombs_l()\fR functions behave identically
to \fBwcsrtombs()\fR and \fBwcsnrtombs()\fR respectively, except
that instead of operating in the current locale, they operate in the locale
specified by \fIloc\fR.
.SH RETURN VALUES
.LP
If conversion stops because a code is reached that does not correspond to a
valid character, an encoding error occurs. In this case, these
functions store the value of the macro \fBEILSEQ\fR in \fBerrno\fR and return
\fB(size_t)\(mi1\fR; the conversion state is undefined. Otherwise, they return
the number of bytes in the resulting character sequence, not including the
terminating null (if any).
.SH ERRORS
.LP
These functions may fail if:
.sp
.ne 2
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 10n
The \fIps\fR argument points to an object that contains an invalid conversion
state.
.RE
.sp
.ne 2
.na
\fB\fBEILSEQ\fR\fR
.ad
.RS 10n
A wide-character code does not correspond to a valid character.
.RE
.SH ATTRIBUTES
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE ATTRIBUTE VALUE
_
Interface Stability See below.
_
MT-Level See below.
.TE
.LP
The \fBwcsrtombs()\fR and \fBwcsnrtombs()\fR functions are Standard. The
\fBwcsrtombs_l()\fR and \fBwcsnrtombs_l()\fR functions are Uncommitted.
.LP
If \fIps\fR is a null pointer, these functions should be considered Unsafe
for use in multithreaded applications. Otherwise, they are MT-Safe.
.SH SEE ALSO
.LP
\fBmbsinit\fR(3C), \fBnewlocale\fR(3C), \fBsetlocale\fR(3C), \fBuselocale\fR(3C),
\fBwcrtomb\fR(3C), \fBattributes\fR(5),
\fBenviron\fR(5), \fBstandards\fR(5)
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