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984c6729c1
git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@14789 87f5fb63-7c3d-0410-a384-fd976d0f7a62
114 lines
3.0 KiB
C
114 lines
3.0 KiB
C
/*
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* $Id: stdio_dropiobreadbuffer.c,v 1.2 2005-01-02 09:07:08 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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/* This would otherwise generate far too much (useless) debug output. */
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#ifdef DEBUG
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#undef DEBUG
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#endif /* DEBUG */
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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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int
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__drop_iob_read_buffer(struct iob * file)
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{
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DECLARE_UTILITYBASE();
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int result = 0;
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ENTER();
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SHOWPOINTER(file);
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assert( file != NULL );
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assert( UtilityBase != NULL );
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if(__check_abort_enabled)
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__check_abort();
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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_SET(file->iob_Flags,IOBF_IN_USE))
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{
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CLEAR_FLAG(file->iob_Flags,IOBF_EOF_REACHED);
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if(__iob_read_buffer_is_valid(file))
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{
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LONG num_unread_bytes;
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num_unread_bytes = __iob_num_unread_bytes(file);
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D(("%ld bytes are to be dropped",num_unread_bytes));
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if(num_unread_bytes > 0)
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{
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struct file_hook_message message;
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SHOWMSG("calling the hook");
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message.action = file_hook_action_seek;
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message.position = -num_unread_bytes;
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message.mode = SEEK_CUR;
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message.result = 0;
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assert( file->iob_Hook != NULL );
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CallHookPkt(file->iob_Hook,file,&message);
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if(message.result < 0)
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{
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SHOWMSG("that didn't work");
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SET_FLAG(file->iob_Flags,IOBF_ERROR);
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result = -1;
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errno = message.error;
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goto out;
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}
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}
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file->iob_BufferReadBytes = 0;
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file->iob_BufferPosition = 0;
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}
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}
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out:
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RETURN(result);
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return(result);
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}
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