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/*
* Copyright (c) 2021 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 <assert.h>
#include <stddef.h> // size_t
#include <stdlib.h> // calloc
#include <stdio.h>
#include "vector.h"
#define DEFAULT_VECTOR_SIZE 64
void _vector_init(void** vector_ptr, size_t elt_size, size_t init_size,
size_t max_size) {
assert(vector_ptr);
assert(max_size == 0 || init_size < max_size);
if (init_size == 0) init_size = DEFAULT_VECTOR_SIZE;
*vector_ptr = NULL;
_vector_resize(vector_ptr, elt_size, init_size);
vector_hdr_t* vh = vector_hdr(*vector_ptr);
vh->cur_size = 0;
vh->max_size = max_size;
}
void _vector_free(void** vector_ptr) {
free(vector_hdr(*vector_ptr));
*vector_ptr = NULL;
}
int _vector_resize(void** vector_ptr, size_t elt_size, off_t pos) {
vector_hdr_t* vh;
size_t old_size;
if (*vector_ptr) {
vh = vector_hdr(*vector_ptr);
old_size = vh->alloc_size;
} else {
vh = NULL;
old_size = 0;
}
/* Round the allocated size to the next power of 2 of the requested position
*/
size_t new_size = next_pow2(pos);
/* Don't grow the vector back */
if (new_size < old_size) return 0;
/* Don't exceed maximum size (for init, check is done beforehand) */
if (vh && vh->max_size && new_size > vh->max_size) return -1;
vh = realloc(vh, VECTOR_HDRLEN + new_size * elt_size);
if (!vh) return -1;
vh->alloc_size = new_size;
/* Zero out the newly allocated memory (except headers) */
memset((uint8_t*)vh + VECTOR_HDRLEN + old_size * elt_size, 0,
(new_size - old_size) * elt_size);
/* Reassign vector pointer */
*vector_ptr = (uint8_t*)vh + VECTOR_HDRLEN;
return 0;
}
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