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/*
* Copyright (c) 2020 Cisco and/or its affiliates.
* 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.
*/
/**
* \file vector.c
* \brief Implementation of resizeable static array
*/
#include <stddef.h> // size_t
#include <stdlib.h> // calloc
#include <stdio.h>
#include "vector.h"
void
_vector_init(void ** vector_ptr, size_t elt_size, size_t max_elts)
{
vector_hdr_t * vh = calloc(VECTOR_HDRLEN + elt_size * max_elts, 1);
*vector_ptr = (uint8_t*)vh + VECTOR_HDRLEN;
vh->max_elts = max_elts;
vh->num_elts = 0;
}
void
_vector_free(void ** vector_ptr)
{
free(vector_hdr(*vector_ptr));
*vector_ptr = NULL;
}
void
_vector_resize(void ** vector_ptr, size_t elt_size, off_t pos)
{
vector_hdr_t * vh = vector_hdr(*vector_ptr);
size_t new_elts = (pos > 0) ? next_pow2(pos) : vh->max_elts * 2;
/* Double the allocated vector size */
vh = realloc(vh, VECTOR_HDRLEN + new_elts * elt_size);
if (!vh)
abort();
vh->max_elts = new_elts;
/* Reassign vector pointer */
*vector_ptr = (uint8_t*)vh + VECTOR_HDRLEN;
}
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