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- Replaced ISO Latin 1 code #160 with a plain blank space (ASCII code #32) where necessary git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@15305 87f5fb63-7c3d-0410-a384-fd976d0f7a62
118 lines
3.2 KiB
C
118 lines
3.2 KiB
C
/*
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* $Id: fcntl_lseek.c,v 1.11 2006-01-08 12:04:22 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) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
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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 _FCNTL_HEADERS_H
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#include "fcntl_headers.h"
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#endif /* _FCNTL_HEADERS_H */
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/****************************************************************************/
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/* The following is not part of the ISO 'C' (1994) standard. */
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/****************************************************************************/
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off_t
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lseek(int file_descriptor, off_t offset, int mode)
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{
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struct file_action_message fam;
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off_t result = SEEK_ERROR;
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struct fd * fd = NULL;
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off_t position;
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ENTER();
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SHOWVALUE(file_descriptor);
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SHOWVALUE(offset);
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SHOWVALUE(mode);
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assert( file_descriptor >= 0 && file_descriptor < __num_fd );
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assert( __fd[file_descriptor] != NULL );
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assert( FLAG_IS_SET(__fd[file_descriptor]->fd_Flags,FDF_IN_USE) );
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if(__check_abort_enabled)
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__check_abort();
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__stdio_lock();
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fd = __get_file_descriptor(file_descriptor);
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if(fd == NULL)
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{
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__set_errno(EBADF);
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goto out;
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}
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__fd_lock(fd);
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if(mode < SEEK_SET || mode > SEEK_END)
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{
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SHOWMSG("seek mode is invalid");
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__set_errno(EINVAL);
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goto out;
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}
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fam.fam_Action = file_action_seek;
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fam.fam_Offset = offset;
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fam.fam_Mode = mode;
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assert( fd->fd_Action != NULL );
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/* Note that a return value of -1 (= SEEK_ERROR) may be a
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valid file position in files larger than 2 GBytes. Just
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to be sure, we therefore also check the secondary error
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to verify that what could be a file position is really
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an error indication. */
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position = (*fd->fd_Action)(fd,&fam);
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if(position == SEEK_ERROR && fam.fam_Error != OK)
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{
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__set_errno(fam.fam_Error);
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goto out;
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}
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/* If this is a valid file position, clear 'errno' so that
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it cannot be mistaken for an error. */
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if(position < 0)
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__set_errno(OK);
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result = position;
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out:
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__fd_unlock(fd);
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__stdio_unlock();
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RETURN(result);
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return(result);
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}
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