mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-06 05:10:05 +00:00
41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/* Copyright (C) 1991, 1993, 1996, 1997 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
|
|
|
|
/* Push the character C back onto the input stream of STREAM. */
|
|
int
|
|
ungetc (c, stream)
|
|
int c;
|
|
FILE *stream;
|
|
{
|
|
if (!__validfp (stream) || !stream->__mode.__read)
|
|
{
|
|
__set_errno (EINVAL);
|
|
return EOF;
|
|
}
|
|
|
|
if (c == EOF)
|
|
return EOF;
|
|
|
|
if (stream->__pushed_back)
|
|
/* There is already a char pushed back. */
|
|
return EOF;
|
|
|
|
if ((stream->__linebuf_active || stream->__put_limit > stream->__buffer) &&
|
|
/* This is a read-write stream with something in its buffer.
|
|
Flush the stream. */
|
|
__flshfp (stream, EOF) == EOF)
|
|
return EOF;
|
|
|
|
stream->__pushback = (unsigned char) c;
|
|
/* Tell __fillbf we've pushed back a char. */
|
|
stream->__pushed_back = 1;
|
|
stream->__pushback_bufp = stream->__bufp;
|
|
/* Make the next getc call __fillbf. It will return C. */
|
|
stream->__bufp = stream->__get_limit;
|
|
|
|
/* We just gave it another character to read, so it's not at EOF. */
|
|
stream->__eof = 0;
|
|
|
|
return stream->__pushback;
|
|
}
|