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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "UNGETWC" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" ungetwc 
+.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
+ungetwc \- push wide-character code back into the input stream
+.SH SYNOPSIS
+.LP
+\fB#include <stdio.h>
+.br
+#include <wchar.h>
+.br
+.sp
+wint_t ungetwc(wint_t\fP \fIwc\fP\fB, FILE *\fP\fIstream\fP\fB);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIungetwc\fP() function shall push the character corresponding
+to the wide-character code specified by \fIwc\fP back onto
+the input stream pointed to by \fIstream\fP. The pushed-back characters
+shall be returned by subsequent reads on that stream in
+the reverse order of their pushing. A successful intervening call
+(with the stream pointed to by \fIstream\fP) to a
+file-positioning function ( \fIfseek\fP(), \fIfsetpos\fP(), or \fIrewind\fP())
+discards any
+pushed-back characters for the stream. The external storage corresponding
+to the stream is unchanged.
+.LP
+At least one character of push-back shall be provided. If \fIungetwc\fP()
+is called too many times on the same stream without
+an intervening read or file-positioning operation on that stream,
+the operation may fail.
+.LP
+If the value of \fIwc\fP equals that of the macro WEOF, the operation
+shall fail and the input stream shall be left
+unchanged.
+.LP
+A successful call to \fIungetwc\fP() shall clear the end-of-file indicator
+for the stream. The value of the file-position
+indicator for the stream after reading or discarding all pushed-back
+characters shall be the same as it was before the characters
+were pushed back. The file-position indicator is decremented (by one
+or more) by each successful call to \fIungetwc\fP(); if its
+value was 0 before a call, its value is unspecified after the call.
+.SH RETURN VALUE
+.LP
+Upon successful completion, \fIungetwc\fP() shall return the wide-character
+code corresponding to the pushed-back character.
+Otherwise, it shall return WEOF.
+.SH ERRORS
+.LP
+The \fIungetwc\fP() function may fail if:
+.TP 7
+.B EILSEQ
+An
+invalid character sequence is detected, or a wide-character code does
+not correspond to a valid character. 
+.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
+\fIfseek\fP(), \fIfsetpos\fP(), \fIread\fP(),
+\fIrewind\fP(), \fIsetbuf\fP(), the Base Definitions volume of
+IEEE\ Std\ 1003.1-2001, \fI<stdio.h>\fP, \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 .