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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "MBLEN" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" mblen 
+.SH NAME
+mblen \- get number of bytes in a character
+.SH SYNOPSIS
+.LP
+\fB#include <stdlib.h>
+.br
+.sp
+int mblen(const char *\fP\fIs\fP\fB, size_t\fP \fIn\fP\fB);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+If \fIs\fP is not a null pointer, \fImblen\fP() shall determine the
+number of bytes constituting the character pointed to by
+\fIs\fP. Except that the shift state of \fImbtowc\fP() is not affected,
+it shall be
+equivalent to:
+.sp
+.RS
+.nf
+
+\fBmbtowc((wchar_t *)0,\fP \fIs\fP\fB,\fP \fIn\fP\fB);
+\fP
+.fi
+.RE
+.LP
+The implementation shall behave as if no function defined in this
+volume of IEEE\ Std\ 1003.1-2001 calls
+\fImblen\fP().
+.LP
+The behavior of this function is affected by the \fILC_CTYPE\fP category
+of the current locale. For a state-dependent encoding,
+this function shall be placed into its initial state by a call for
+which its character pointer argument, \fIs\fP, is a null
+pointer. Subsequent calls with \fIs\fP as other than a null pointer
+shall cause the internal state of the function to be altered
+as necessary. A call with \fIs\fP as a null pointer shall cause this
+function to return a non-zero value if encodings have state
+dependency, and 0 otherwise. If the implementation employs special
+bytes to change the shift state, these bytes shall not produce
+separate wide-character codes, but shall be grouped with an adjacent
+character. Changing the \fILC_CTYPE\fP category causes the
+shift state of this function to be unspecified.
+.SH RETURN VALUE
+.LP
+If \fIs\fP is a null pointer, \fImblen\fP() shall return a non-zero
+or 0 value, if character encodings, respectively, do or do
+not have state-dependent encodings. If \fIs\fP is not a null pointer,
+\fImblen\fP() shall either return 0 (if \fIs\fP points to
+the null byte), or return the number of bytes that constitute the
+character (if the next \fIn\fP or fewer bytes form a valid
+character), or return -1 (if they do not form a valid character) 
+\ and may set \fIerrno\fP to indicate the error.  In no case shall
+the value returned be greater than \fIn\fP or the value of
+the {MB_CUR_MAX} macro.
+.SH ERRORS
+.LP
+The \fImblen\fP() function may fail if:
+.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
+\fImbtowc\fP() , \fImbstowcs\fP() , \fIwctomb\fP() , \fIwcstombs\fP()
+, the Base Definitions volume of
+IEEE\ Std\ 1003.1-2001, \fI<stdlib.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 .