1 files changed, 97 insertions, 0 deletions
diff --git a/cpukit/libfs/src/imfs/imfs_linfile.c b/cpukit/libfs/src/imfs/imfs_linfile.c
new file mode 100644
index 0000000000..8a1486600b
--- /dev/null
+++ b/cpukit/libfs/src/imfs/imfs_linfile.c
@@ -0,0 +1,97 @@
+/**
+ * @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 "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 ((iop->flags & LIBIO_FLAGS_WRITE) != 0) {
+    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;
+    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,
+  .poll_h = rtems_filesystem_default_poll,
+  .readv_h = rtems_filesystem_default_readv,
+  .writev_h = rtems_filesystem_default_writev
+};
+
+const IMFS_node_control IMFS_node_control_linfile = {
+  .handlers = &IMFS_linfile_handlers,
+  .node_initialize = IMFS_node_initialize_default,
+  .node_remove = IMFS_node_remove_default,
+  .node_destroy = IMFS_node_destroy_default
+};