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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.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <stdio.h>
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/* Push the character C back onto the input stream of STREAM. */
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int
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ungetc (c, stream)
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int c;
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FILE *stream;
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{
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if (!__validfp (stream) || !stream->__mode.__read)
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{
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__set_errno (EINVAL);
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return EOF;
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}
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if (c == EOF)
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return EOF;
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if (stream->__pushed_back)
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/* There is already a char pushed back. */
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return EOF;
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if ((stream->__linebuf_active || stream->__put_limit > stream->__buffer) &&
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/* This is a read-write stream with something in its buffer.
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Flush the stream. */
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__flshfp (stream, EOF) == EOF)
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return EOF;
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stream->__pushback = (unsigned char) c;
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/* Tell __fillbf we've pushed back a char. */
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stream->__pushed_back = 1;
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stream->__pushback_bufp = stream->__bufp;
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/* Make the next getc call __fillbf. It will return C. */
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stream->__bufp = stream->__get_limit;
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/* We just gave it another character to read, so it's not at EOF. */
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stream->__eof = 0;
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return stream->__pushback;
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}
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