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/**
* @file
*
* @ingroup IMFS
*/
/*
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <rtems/imfs.h>
static ssize_t IMFS_linfile_read(
rtems_libio_t *iop,
void *buffer,
size_t count
)
{
IMFS_file_t *file = IMFS_iop_to_file( iop );
off_t start = iop->offset;
size_t size = file->File.size;
const unsigned char *data = file->Linearfile.direct;
if (count > size - start)
count = size - start;
IMFS_update_atime( &file->Node );
iop->offset = start + count;
memcpy(buffer, &data[start], count);
return (ssize_t) count;
}
static int IMFS_linfile_open(
rtems_libio_t *iop,
const char *pathname,
int oflag,
mode_t mode
)
{
IMFS_file_t *file;
file = iop->pathinfo.node_access;
/*
* Perform 'copy on write' for linear files
*/
if (rtems_libio_iop_is_writeable(iop)) {
uint32_t count = file->File.size;
const unsigned char *buffer = file->Linearfile.direct;
file->Node.control = &IMFS_mknod_control_memfile.node_control;
file->File.size = 0;
file->Memfile.indirect = 0;
file->Memfile.doubly_indirect = 0;
file->Memfile.triply_indirect = 0;
IMFS_Set_handlers( &iop->pathinfo );
if ((count != 0)
&& (IMFS_memfile_write(&file->Memfile, 0, buffer, count) == -1))
return -1;
}
return 0;
}
static const rtems_filesystem_file_handlers_r IMFS_linfile_handlers = {
.open_h = IMFS_linfile_open,
.close_h = rtems_filesystem_default_close,
.read_h = IMFS_linfile_read,
.write_h = rtems_filesystem_default_write,
.ioctl_h = rtems_filesystem_default_ioctl,
.lseek_h = rtems_filesystem_default_lseek_file,
.fstat_h = IMFS_stat_file,
.ftruncate_h = rtems_filesystem_default_ftruncate,
.fsync_h = rtems_filesystem_default_fsync_or_fdatasync_success,
.fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync_success,
.fcntl_h = rtems_filesystem_default_fcntl,
.kqfilter_h = rtems_filesystem_default_kqfilter,
.mmap_h = rtems_filesystem_default_mmap,
.poll_h = rtems_filesystem_default_poll,
.readv_h = rtems_filesystem_default_readv,
.writev_h = rtems_filesystem_default_writev
};
static IMFS_jnode_t *IMFS_node_initialize_linfile(
IMFS_jnode_t *node,
void *arg
)
{
IMFS_linearfile_t *linfile;
IMFS_linearfile_context *ctx;
linfile = (IMFS_linearfile_t *) node;
ctx = arg;
linfile->File.size = ctx->size;
linfile->direct = RTEMS_DECONST( void *, ctx->data );
return node;
}
const IMFS_node_control IMFS_node_control_linfile = {
.handlers = &IMFS_linfile_handlers,
.node_initialize = IMFS_node_initialize_linfile,
.node_remove = IMFS_node_remove_default,
.node_destroy = IMFS_node_destroy_default
};
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