mirror of
https://github.com/adtools/clib2.git
synced 2025-12-08 14:59:05 +00:00
a9c8cdc554
initialization code for the stdin/stdout/stderr streams and out of the program parameter setup. - The current program name is now set up in the stdlib initialization function. - Simplified the machine test code; moved the FPU check into the math initialization code. - Added more safety checks to verify that file descriptor file handles are valid. git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@14864 87f5fb63-7c3d-0410-a384-fd976d0f7a62
161 lines
3.9 KiB
C
161 lines
3.9 KiB
C
/*
|
|
* $Id: unistd_ftruncate.c,v 1.7 2005-03-07 11:16:43 obarthel Exp $
|
|
*
|
|
* :ts=4
|
|
*
|
|
* Portable ISO 'C' (1994) runtime library for the Amiga computer
|
|
* Copyright (c) 2002-2005 by Olaf Barthel <olsen@sourcery.han.de>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* - Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* - Neither the name of Olaf Barthel nor the names of contributors
|
|
* may be used to endorse or promote products derived from this
|
|
* software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef _UNISTD_HEADERS_H
|
|
#include "unistd_headers.h"
|
|
#endif /* _UNISTD_HEADERS_H */
|
|
|
|
/****************************************************************************/
|
|
|
|
/* The following is not part of the ISO 'C' (1994) standard. */
|
|
|
|
/****************************************************************************/
|
|
|
|
int
|
|
ftruncate(int file_descriptor, off_t length)
|
|
{
|
|
D_S(struct FileInfoBlock,fib);
|
|
int result = -1;
|
|
struct fd * fd = NULL;
|
|
long int position;
|
|
BOOL success;
|
|
|
|
ENTER();
|
|
|
|
SHOWVALUE(file_descriptor);
|
|
SHOWVALUE(length);
|
|
|
|
assert( file_descriptor >= 0 && file_descriptor < __num_fd );
|
|
assert( __fd[file_descriptor] != NULL );
|
|
assert( FLAG_IS_SET(__fd[file_descriptor]->fd_Flags,FDF_IN_USE) );
|
|
|
|
if(__check_abort_enabled)
|
|
__check_abort();
|
|
|
|
fd = __get_file_descriptor(file_descriptor);
|
|
if(fd == NULL)
|
|
{
|
|
__set_errno(EBADF);
|
|
goto out;
|
|
}
|
|
|
|
__fd_lock(fd);
|
|
|
|
if(FLAG_IS_SET(fd->fd_Flags,FDF_IS_SOCKET))
|
|
{
|
|
__set_errno(EINVAL);
|
|
goto out;
|
|
}
|
|
|
|
if(fd->fd_DefaultFile == ZERO)
|
|
{
|
|
__set_errno(EBADF);
|
|
goto out;
|
|
}
|
|
|
|
if(length < 0)
|
|
{
|
|
SHOWMSG("invalid length");
|
|
|
|
__set_errno(EINVAL);
|
|
goto out;
|
|
}
|
|
|
|
assert( FLAG_IS_SET(fd->fd_Flags,FDF_IN_USE) );
|
|
|
|
if(FLAG_IS_CLEAR(fd->fd_Flags,FDF_WRITE))
|
|
{
|
|
SHOWMSG("file descriptor is not write-enabled");
|
|
|
|
__set_errno(EINVAL);
|
|
goto out;
|
|
}
|
|
|
|
/* Remember where we started. */
|
|
position = lseek(file_descriptor,0,SEEK_CUR);
|
|
if(position < 0)
|
|
goto out;
|
|
|
|
if(CANNOT __safe_examine_file_handle(fd->fd_DefaultFile,fib))
|
|
{
|
|
SHOWMSG("couldn't examine file");
|
|
|
|
__set_errno(__translate_io_error_to_errno(IoErr()));
|
|
goto out;
|
|
}
|
|
|
|
PROFILE_OFF();
|
|
|
|
if(length < fib->fib_Size)
|
|
{
|
|
/* Careful: seek to a position where the file can be safely truncated. */
|
|
success = (Seek(fd->fd_DefaultFile,length,OFFSET_BEGINNING) != -1 && SetFileSize(fd->fd_DefaultFile,length,OFFSET_BEGINNING) != -1);
|
|
}
|
|
else if (length > fib->fib_Size)
|
|
{
|
|
success = (Seek(fd->fd_DefaultFile,fib->fib_Size,OFFSET_BEGINNING) != -1 && __grow_file_size(fd,length - fib->fib_Size) == OK);
|
|
}
|
|
else
|
|
{
|
|
success = TRUE;
|
|
}
|
|
|
|
PROFILE_ON();
|
|
|
|
if(NO success)
|
|
{
|
|
int error;
|
|
|
|
error = __translate_io_error_to_errno(IoErr());
|
|
|
|
/* Return to the original file position. */
|
|
lseek(file_descriptor,position,SEEK_SET);
|
|
|
|
__set_errno(error);
|
|
goto out;
|
|
}
|
|
|
|
/* Return to the original file position. */
|
|
if(lseek(file_descriptor,position,SEEK_SET) < 0)
|
|
goto out;
|
|
|
|
result = 0;
|
|
|
|
out:
|
|
|
|
__fd_unlock(fd);
|
|
|
|
RETURN(result);
|
|
return(result);
|
|
}
|