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Languguage OS 2
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Languguage OS II Version 10-94 (Knowledge Media)(1994).ISO
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gnu
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glibc108.zip
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glibc108
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stdio
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ftell.c
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1992-10-02
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/* Copyright (C) 1991, 1992 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <ansidecl.h>
#include <errno.h>
#include <stdio.h>
/* Return the offset in bytes from the beginning
of the file of the file position of STREAM. */
long int
DEFUN(ftell, (stream), FILE *stream)
{
long int pos;
if (!__validfp (stream))
{
errno = EINVAL;
return -1L;
}
if (__stdio_check_offset (stream) == EOF)
return -1L;
pos = stream->__target + (stream->__bufp - stream->__buffer);
if (stream->__pushed_back)
/* Calling ungetc is supposed to decrement the file position.
ANSI says the file position is unspecified if you ungetc when
the position is zero; -1 seems as good as anything to me. */
--pos;
return pos;
}