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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.
55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
/* Copyright (C) 1991, 1992, 1994, 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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/* Return the offset in bytes from the beginning
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of the file of the file position of STREAM. */
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long int
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ftell (stream)
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FILE *stream;
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{
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long int pos;
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if (!__validfp (stream))
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{
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__set_errno (EINVAL);
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return -1L;
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}
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if (__stdio_check_offset (stream) == EOF)
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return -1L;
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/* Start with the file position associated with the beginning
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of our buffer. */
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pos = stream->__target;
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if (stream->__pushed_back)
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/* ungetc was just called, so our real buffer pointer is squirreled
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away in STREAM->__pushback_bufp, not in STREAM->__bufp as normal.
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Calling ungetc is supposed to decrement the file position. ANSI
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says the file position is unspecified if you ungetc when the
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position is zero; -1 seems as good as anything to me. */
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pos += stream->__pushback_bufp - stream->__buffer - 1;
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else
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pos += stream->__bufp - stream->__buffer;
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return pos;
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}
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