2004-11-03 13:51:07 +00:00
|
|
|
.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
|
|
|
|
|
.\"
|
|
|
|
|
.\" This is free documentation; you can redistribute it and/or
|
|
|
|
|
.\" modify it under the terms of the GNU General Public License as
|
|
|
|
|
.\" published by the Free Software Foundation; either version 2 of
|
|
|
|
|
.\" the License, or (at your option) any later version.
|
|
|
|
|
.\"
|
|
|
|
|
.\" References consulted:
|
|
|
|
|
.\" GNU glibc-2 source code and manual
|
|
|
|
|
.\" Dinkumware C library reference http://www.dinkumware.com/
|
|
|
|
|
.\" OpenGroup's Single Unix specification http://www.UNIX-systems.org/online.html
|
|
|
|
|
.\" ISO/IEC 9899:1999
|
|
|
|
|
.\"
|
|
|
|
|
.TH UNGETWC 3 1999-09-19 "GNU" "Linux Programmer's Manual"
|
|
|
|
|
.SH NAME
|
|
|
|
|
ungetwc \- push back a wide character onto a FILE stream
|
|
|
|
|
.SH SYNOPSIS
|
|
|
|
|
.nf
|
|
|
|
|
.B #include <wchar.h>
|
|
|
|
|
.sp
|
|
|
|
|
.BI "wint_t ungetwc(wint_t " wc ", FILE *" stream );
|
|
|
|
|
.fi
|
|
|
|
|
.SH DESCRIPTION
|
2005-10-19 08:35:30 +00:00
|
|
|
The \fBungetwc\fP() function is the wide-character equivalent of the \fBungetc\fP()
|
2004-11-03 13:51:07 +00:00
|
|
|
function. It pushes back a wide character onto \fIstream\fP and returns it.
|
|
|
|
|
.PP
|
|
|
|
|
If \fIwc\fP is WEOF, it returns WEOF. If \fIwc\fP is an invalid wide character,
|
2006-02-09 20:29:51 +00:00
|
|
|
it sets \fIerrno\fP to \fBEILSEQ\fP and returns WEOF.
|
2004-11-03 13:51:07 +00:00
|
|
|
.PP
|
|
|
|
|
If \fIwc\fP is a valid wide character, it is pushed back onto the stream
|
|
|
|
|
and thus becomes available for future wide character read operations.
|
|
|
|
|
The file-position indicator is decremented by one or more. The end-of-file
|
|
|
|
|
indicator is cleared. The backing storage of the file is not affected.
|
|
|
|
|
.PP
|
|
|
|
|
Note: \fIwc\fP need not be the last wide character read from the stream;
|
|
|
|
|
it can be any other valid wide character.
|
|
|
|
|
.PP
|
|
|
|
|
If the implementation supports multiple push-back operations in a row, the
|
|
|
|
|
pushed-back wide characters will be read in reverse order; however, only one
|
|
|
|
|
level of push-back is guaranteed.
|
|
|
|
|
.SH "RETURN VALUE"
|
2005-10-19 06:54:38 +00:00
|
|
|
The \fBungetwc\fP() function returns \fIwc\fP when successful, or WEOF upon
|
2004-11-03 13:51:07 +00:00
|
|
|
failure.
|
|
|
|
|
.SH "CONFORMING TO"
|
|
|
|
|
ISO/ANSI C, UNIX98
|
|
|
|
|
.SH "SEE ALSO"
|
|
|
|
|
.BR fgetwc (3)
|
|
|
|
|
.SH NOTES
|
2005-10-19 06:54:38 +00:00
|
|
|
The behaviour of \fBungetwc\fP() depends on the LC_CTYPE category of the
|
2004-11-03 13:51:07 +00:00
|
|
|
current locale.
|
