path: root/lib/erl_interface/src/encode/encode_atom.c

/*
 * %CopyrightBegin%
 * 
 * Copyright Ericsson AB 1998-2011. 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 <string.h>
#include <limits.h>
#include "eidef.h"
#include "eiext.h"
#include "putget.h"

int ei_encode_atom(char *buf, int *index, const char *p)
{
    size_t len = strlen(p);

    if (len >= INT_MAX) return -1;
    return ei_encode_atom_len(buf, index, p, len);
}

int ei_encode_atom_len(char *buf, int *index, const char *p, int len)
{
  char *s = buf + *index;
  char *s0 = s;

  /* This function is documented to truncate at MAXATOMLEN (256) */ 
  if (len > MAXATOMLEN)
    len = MAXATOMLEN;

  if (!buf) s += 3;
  else {
    put8(s,ERL_ATOM_EXT);
    put16be(s,len);

    memmove(s,p,len); /* unterminated string */
  }
  s += len;

  *index += s-s0; 

  return 0; 
}