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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "WCRTOMB" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" wcrtomb 
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.SH NAME
+wcrtomb \- convert a wide-character code to a character (restartable)
+.SH SYNOPSIS
+.LP
+\fB#include <stdio.h>
+.br
+.sp
+size_t wcrtomb(char *restrict\fP \fIs\fP\fB, wchar_t\fP \fIwc\fP\fB,
+mbstate_t *restrict\fP \fIps\fP\fB);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+If \fIs\fP is a null pointer, the \fIwcrtomb\fP() function shall be
+equivalent to the call:
+.sp
+.RS
+.nf
+
+\fBwcrtomb(\fP\fIbuf\fP\fB, L'\\0',\fP \fIps\fP\fB)
+\fP
+.fi
+.RE
+.LP
+where \fIbuf\fP is an internal buffer.
+.LP
+If \fIs\fP is not a null pointer, the \fIwcrtomb\fP() function shall
+determine the number of bytes needed to represent the
+character that corresponds to the wide character given by \fIwc\fP
+(including any shift sequences), and store the resulting bytes
+in the array whose first element is pointed to by \fIs\fP. At most
+{MB_CUR_MAX} bytes are stored. If \fIwc\fP is a null wide
+character, a null byte shall be stored, preceded by any shift sequence
+needed to restore the initial shift state. The resulting
+state described shall be the initial conversion state.
+.LP
+If \fIps\fP is a null pointer, the \fIwcrtomb\fP() function shall
+use its own internal \fBmbstate_t\fP object, which is
+initialized at program start-up to the initial conversion state. Otherwise,
+the \fBmbstate_t\fP object pointed to by \fIps\fP
+shall be used to completely describe the current conversion state
+of the associated character sequence. The implementation shall
+behave as if no function defined in this volume of IEEE\ Std\ 1003.1-2001
+calls \fIwcrtomb\fP().
+.LP
+If
+the application uses any of the _POSIX_THREAD_SAFE_FUNCTIONS or _POSIX_THREADS
+functions, the application shall ensure that the
+\fIwcrtomb\fP() function is called with a non-NULL \fIps\fP argument.
+.LP
+The behavior of this function shall be affected by the \fILC_CTYPE\fP
+category of the current locale.
+.SH RETURN VALUE
+.LP
+The \fIwcrtomb\fP() function shall return the number of bytes stored
+in the array object (including any shift sequences). When
+\fIwc\fP is not a valid wide character, an encoding error shall occur.
+In this case, the function shall store the value of the
+macro [EILSEQ] in \fIerrno\fP and shall return (\fBsize_t\fP)-1; the
+conversion state shall be undefined.
+.SH ERRORS
+.LP
+The \fIwcrtomb\fP() function may fail if:
+.TP 7
+.B EINVAL
+\fIps\fP points to an object that contains an invalid conversion state.
+.TP 7
+.B EILSEQ
+Invalid wide-character code is detected.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fImbsinit\fP(), the Base Definitions volume of IEEE\ Std\ 1003.1-2001,
+\fI<wchar.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .