static int memfile_ftruncate(
rtems_libio_t *iop,
off_t length
)
{
IMFS_memfile_t *memfile = IMFS_iop_to_memfile( iop );
/*
* POSIX 1003.1b does not specify what happens if you truncate a file
* and the new length is greater than the current size. We treat this
* as an extend operation.
*/
if ( length > memfile->File.size )
return IMFS_memfile_extend( memfile, true, length );
/*
* The in-memory files do not currently reclaim memory until the file is
* deleted. So we leave the previously allocated blocks in place for
* future use and just set the length.
*/
memfile->File.size = length;
IMFS_mtime_ctime_update( &memfile->File.Node );
return 0;
}
static ssize_t memfile_write(
rtems_libio_t *iop,
const void *buffer,
size_t count
)
{
IMFS_memfile_t *memfile = IMFS_iop_to_memfile( iop );
ssize_t status;
if (rtems_libio_iop_is_append(iop))
iop->offset = memfile->File.size;
status = IMFS_memfile_write( memfile, iop->offset, buffer, count );
if ( status > 0 )
iop->offset += status;
return status;
}
static ssize_t memfile_write(
rtems_libio_t *iop,
const void *buffer,
size_t count
)
{
IMFS_memfile_t *memfile = IMFS_iop_to_memfile( iop );
ssize_t status;
if ((iop->flags & LIBIO_FLAGS_APPEND) != 0)
iop->offset = memfile->File.size;
status = IMFS_memfile_write( memfile, iop->offset, buffer, count );
if ( status > 0 )
iop->offset += status;
return status;
}
