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1d611fefbe
are detected. - Modified function return values of 0 and -1 to use macros like OK, ERROR/SEEK_ERROR instead, to better convey what the purpose of these values is. git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@14922 87f5fb63-7c3d-0410-a384-fd976d0f7a62
132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
/*
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* $Id: stdio_ftell.c,v 1.8 2005-04-24 08:46:37 obarthel Exp $
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*
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* :ts=4
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*
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* Portable ISO 'C' (1994) runtime library for the Amiga computer
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* Copyright (c) 2002-2005 by Olaf Barthel <olsen@sourcery.han.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Neither the name of Olaf Barthel nor the names of contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _STDLIB_NULL_POINTER_CHECK_H
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#include "stdlib_null_pointer_check.h"
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#endif /* _STDLIB_NULL_POINTER_CHECK_H */
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/****************************************************************************/
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#ifndef _STDIO_HEADERS_H
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#include "stdio_headers.h"
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#endif /* _STDIO_HEADERS_H */
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/****************************************************************************/
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long int
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ftell(FILE *stream)
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{
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struct iob * file = (struct iob *)stream;
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struct file_action_message fam;
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long int result = ERROR;
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int position;
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assert( stream != NULL );
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if(__check_abort_enabled)
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__check_abort();
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flockfile(stream);
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#if defined(CHECK_FOR_NULL_POINTERS)
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{
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if(stream == NULL)
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{
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__set_errno(EFAULT);
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goto out;
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}
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}
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#endif /* CHECK_FOR_NULL_POINTERS */
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assert( __is_valid_iob(file) );
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assert( FLAG_IS_SET(file->iob_Flags,IOBF_IN_USE) );
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assert( file->iob_BufferSize > 0 );
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if(FLAG_IS_CLEAR(file->iob_Flags,IOBF_IN_USE))
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{
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SHOWMSG("this file is not even in use");
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SET_FLAG(file->iob_Flags,IOBF_ERROR);
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__set_errno(EBADF);
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goto out;
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}
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SHOWMSG("calling the hook");
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SHOWPOINTER(&fam);
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fam.fam_Action = file_action_seek;
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fam.fam_Offset = 0;
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fam.fam_Mode = SEEK_CUR;
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SHOWVALUE(fam.fam_Offset);
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SHOWVALUE(fam.fam_Mode);
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assert( file->iob_Action != NULL );
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position = (*file->iob_Action)(file,&fam);
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if(position == EOF)
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{
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SET_FLAG(file->iob_Flags,IOBF_ERROR);
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__set_errno(fam.fam_Error);
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goto out;
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}
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if(__iob_read_buffer_is_valid(file))
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{
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/* Subtract the number of bytes still in the buffer which have
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* not been read before.
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*/
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position -= __iob_num_unread_bytes(file);
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}
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else if (__iob_write_buffer_is_valid(file))
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{
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/* Add the number of bytes still stored in the buffer which have
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* not been written to disk yet.
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*/
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position += __iob_num_unwritten_bytes(file);
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}
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result = position;
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out:
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funlockfile(stream);
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return(result);
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}
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