text: /*
   * %CopyrightBegin%
   * 
   * Copyright Ericsson AB 1998-2013. All Rights Reserved.
   * 
   * The contents of this file are subject to the Erlang Public License,
   * Version 1.1, (the "License"); you may not use this file except in
   * compliance with the License. You should have received a copy of the
   * Erlang Public License along with this software. If not, it can be
   * retrieved online at http://www.erlang.org/.
   * 
   * Software distributed under the License is distributed on an "AS IS"
   * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
   * the License for the specific language governing rights and limitations
   * under the License.
   * 
   * %CopyrightEnd%
   */
  #include "eidef.h"
  #include "putget.h"
  
  int ei_decode_trace(const char *buf, int *index, erlang_trace *p)
  {
    int arity = 0;
    int tindex = *index; /* use a temporary index if any function should fail */
    long *p_flags, *p_label, *p_serial, *p_prev;
    erlang_pid *p_from;
  
    if (p != NULL) {
        p_flags = &p->flags;
        p_label = &p->label;
        p_serial = &p->serial;
        p_prev = &p->prev;
        p_from = &p->from;
    }
    else {
        p_flags = p_label = p_serial = p_prev = NULL;
        p_from = NULL;
    }
  
    /* { Flags, Label, Serial, FromPid, Prev } */
    if (ei_decode_tuple_header(buf, &tindex, &arity)
        || (arity != 5)
        || ei_decode_long(buf, &tindex, p_flags)
        || ei_decode_long(buf, &tindex, p_label)
        || ei_decode_long(buf, &tindex, p_serial)
        || ei_decode_pid( buf, &tindex, p_from)
        || ei_decode_long(buf, &tindex, p_prev)) return -1;
  
    /* index is updated by the functions we called */
    
    *index = tindex;
  
    return 0;
  }
  