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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "MBRLEN" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" mbrlen 
+.SH NAME
+mbrlen \- get number of bytes in a character (restartable)
+.SH SYNOPSIS
+.LP
+\fB#include <wchar.h>
+.br
+.sp
+size_t mbrlen(const char *restrict\fP \fIs\fP\fB, size_t\fP \fIn\fP\fB,
+.br
+\ \ \ \ \ \  mbstate_t *restrict\fP \fIps\fP\fB);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+If \fIs\fP is not a null pointer, \fImbrlen\fP() shall determine the
+number of bytes constituting the character pointed to by
+\fIs\fP. It shall be equivalent to:
+.sp
+.RS
+.nf
+
+\fBmbstate_t internal;
+mbrtowc(NULL, s, n, ps != NULL ? ps : &internal);
+\fP
+.fi
+.RE
+.LP
+If \fIps\fP is a null pointer, the \fImbrlen\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 \fImbrlen\fP().
+.LP
+The behavior of this function is affected by the \fILC_CTYPE\fP category
+of the current locale.
+.SH RETURN VALUE
+.LP
+The \fImbrlen\fP() function shall return the first of the following
+that applies:
+.TP 7
+0
+If the next \fIn\fP or fewer bytes complete the character that corresponds
+to the null wide character.
+.TP 7
+\fIpositive\fP
+If the next \fIn\fP or fewer bytes complete a valid character; the
+value returned shall be the number of bytes that complete
+the character.
+.TP 7
+(\fBsize_t\fP)-2
+If the next \fIn\fP bytes contribute to an incomplete but potentially
+valid character, and all \fIn\fP bytes have been
+processed. When \fIn\fP has at least the value of the {MB_CUR_MAX}
+macro, this case can only occur if \fIs\fP points at a
+sequence of redundant shift sequences (for implementations with state-dependent
+encodings).
+.TP 7
+(\fBsize_t\fP)-1
+If an encoding error occurs, in which case the next \fIn\fP or fewer
+bytes do not contribute to a complete and valid
+character. In this case, [EILSEQ] shall be stored in \fIerrno\fP and
+the conversion state is undefined.
+.sp
+.SH ERRORS
+.LP
+The \fImbrlen\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 character sequence 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() , \fImbrtowc\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 .