ext/libfdt/fdt_empty_tree.c

   1 /*
   2  * libfdt - Flat Device Tree manipulation
   3  * Copyright (C) 2012 David Gibson, IBM Corporation.
   4  *
   5  *     Redistribution and use in source and binary forms, with or
   6  *     without modification, are permitted provided that the following
   7  *     conditions are met:
   8  *
   9  *     1. Redistributions of source code must retain the above
  10  *        copyright notice, this list of conditions and the following
  11  *        disclaimer.
  12  *     2. Redistributions in binary form must reproduce the above
  13  *        copyright notice, this list of conditions and the following
  14  *        disclaimer in the documentation and/or other materials
  15  *        provided with the distribution.
  16  *
  17  *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  18  *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  19  *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  20  *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  21  *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  22  *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23  *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  24  *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  25  *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  28  *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  29  *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31 #include <fdt.h>
  32 #include <libfdt.h>
  33
  34 #include "libfdt_env.h"
  35 #include "libfdt_internal.h"
  36
  37 int fdt_create_empty_tree(void *buf, int bufsize)
  38 {
  39         int err;
  40
  41         err = fdt_create(buf, bufsize);
  42         if (err)
  43                 return err;
  44
  45         err = fdt_finish_reservemap(buf);
  46         if (err)
  47                 return err;
  48
  49         err = fdt_begin_node(buf, "");
  50         if (err)
  51                 return err;
  52
  53         err =  fdt_end_node(buf);
  54         if (err)
  55                 return err;
  56
  57         err = fdt_finish(buf);
  58         if (err)
  59                 return err;
  60
  61         return fdt_open_into(buf, buf, bufsize);
  62 }
  63