$NetBSD: ungetwc.3,v 1.3 2002/02/07 07:00:27 ross Exp $
Copyright (c) 1990, 1991, 1993
The Regents of the University of California. All rights reserved.
This code is derived from software contributed to Berkeley by
Chris Torek and the American National Standards Committee X3,
on Information Processing Systems.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
4. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
@(#)ungetc.3 8.1 (Berkeley) 6/4/93
$FreeBSD$
.Dd March 3, 2004 .Dt UNGETWC 3 .Os .Sh NAME .Nm ungetwc .Nd un-get wide character from input stream .Sh LIBRARY .Lb libc .Sh SYNOPSIS n stdio.h n wchar.h .Ft wint_t .Fn ungetwc "wint_t wc" "FILE *stream" .Sh DESCRIPTION The .Fn ungetwc function pushes the wide character .Fa wc (converted to an .Vt wchar_t ) back onto the input stream pointed to by .Fa stream . The pushed-backed wide characters will be returned by subsequent reads on the stream (in reverse order). A successful intervening call, using the same stream, to one of the file positioning functions .Xr fseek 3 , .Xr fsetpos 3 , or .Xr rewind 3 will discard the pushed back wide characters.
Copyright (c) 1990, 1991, 1993
The Regents of the University of California. All rights reserved.
This code is derived from software contributed to Berkeley by
Chris Torek and the American National Standards Committee X3,
on Information Processing Systems.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
4. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
@(#)ungetc.3 8.1 (Berkeley) 6/4/93
$FreeBSD$
.Dd March 3, 2004 .Dt UNGETWC 3 .Os .Sh NAME .Nm ungetwc .Nd un-get wide character from input stream .Sh LIBRARY .Lb libc .Sh SYNOPSIS n stdio.h n wchar.h .Ft wint_t .Fn ungetwc "wint_t wc" "FILE *stream" .Sh DESCRIPTION The .Fn ungetwc function pushes the wide character .Fa wc (converted to an .Vt wchar_t ) back onto the input stream pointed to by .Fa stream . The pushed-backed wide characters will be returned by subsequent reads on the stream (in reverse order). A successful intervening call, using the same stream, to one of the file positioning functions .Xr fseek 3 , .Xr fsetpos 3 , or .Xr rewind 3 will discard the pushed back wide characters.
p One wide character of push-back is guaranteed, but as long as there is sufficient memory, an effectively infinite amount of pushback is allowed.
p If a character is successfully pushed-back, the end-of-file indicator for the stream is cleared. .Sh RETURN VALUES The .Fn ungetwc function returns the wide character pushed-back after the conversion, or .Dv WEOF if the operation fails. If the value of the argument .Fa c character equals .Dv WEOF , the operation will fail and the stream will remain unchanged. .Sh SEE ALSO .Xr fseek 3 , .Xr getwc 3 .Sh STANDARDS The .Fn ungetwc function conforms to .St -isoC-99 .