/****************************************************************************
 * apps/crypto/openssl_mbedtls_wrapper/mbedtls/stack.c
 *
 * SPDX-License-Identifier: Apache-2.0
 * SPDX-FileCopyrightText: 2015-2016 Espressif Systems (Shanghai) PTE LTD
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <openssl/stack.h>
#include <openssl/ssl_dbg.h>
#include "ssl_port.h"

#ifndef CONFIG_MIN_NODES
    #define MIN_NODES 4
#else
    #define MIN_NODES CONFIG_MIN_NODES
#endif

/****************************************************************************
 * Public Functions
 ****************************************************************************/

OPENSSL_STACK *OPENSSL_sk_new(OPENSSL_sk_compfunc c)
{
  OPENSSL_STACK *stack;
  char **data;

  stack = ssl_mem_zalloc(sizeof(OPENSSL_STACK));
  if (!stack)
    {
      SSL_DEBUG(SSL_STACK_ERROR_LEVEL, "no enough memory > (stack)");
      goto no_mem1;
    }

  data = ssl_mem_zalloc(sizeof(*data) * MIN_NODES);
  if (!data)
    {
      SSL_DEBUG(SSL_STACK_ERROR_LEVEL, "no enough memory > (data)");
      goto no_mem2;
    }

  stack->data = data;
  stack->num_alloc = MIN_NODES;
  stack->c = c;

  return stack;

no_mem2:
  ssl_mem_free(stack);
no_mem1:
  return NULL;
}

OPENSSL_STACK *OPENSSL_sk_new_null(void)
{
  return OPENSSL_sk_new((OPENSSL_sk_compfunc)NULL);
}

void OPENSSL_sk_free(OPENSSL_STACK *stack)
{
  SSL_ASSERT3(stack);

  ssl_mem_free(stack->data);
  ssl_mem_free(stack);
}