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/*
* Copyright (C) Igor Sysoev
* Copyright (C) NGINX, Inc.
*/
#include <nxt_main.h>
nxt_array_t *
nxt_array_create(nxt_mp_t *mp, nxt_uint_t n, size_t size)
{
nxt_array_t *array;
array = nxt_mp_alloc(mp, sizeof(nxt_array_t) + n * size);
if (nxt_slow_path(array == NULL)) {
return NULL;
}
array->elts = nxt_pointer_to(array, sizeof(nxt_array_t));
array->nelts = 0;
array->size = size;
array->nalloc = n;
array->mem_pool = mp;
return array;
}
void
nxt_array_destroy(nxt_array_t *array)
{
if (array->elts != nxt_pointer_to(array, sizeof(nxt_array_t))) {
nxt_mp_free(array->mem_pool, array->elts);
}
nxt_mp_free(array->mem_pool, array);
}
void *
nxt_array_add(nxt_array_t *array)
{
void *p;
uint32_t nalloc, new_alloc;
nalloc = array->nalloc;
if (array->nelts == nalloc) {
if (nalloc < 16) {
/* Allocate new array twice larger than current. */
new_alloc = (nalloc == 0) ? 4 : nalloc * 2;
} else {
/* Allocate new array 1.5 times larger than current. */
new_alloc = nalloc + nalloc / 2;
}
p = nxt_mp_alloc(array->mem_pool, array->size * new_alloc);
if (nxt_slow_path(p == NULL)) {
return NULL;
}
nxt_memcpy(p, array->elts, array->size * nalloc);
if (array->elts != nxt_pointer_to(array, sizeof(nxt_array_t))) {
nxt_mp_free(array->mem_pool, array->elts);
}
array->elts = p;
array->nalloc = new_alloc;
}
p = nxt_pointer_to(array->elts, array->size * array->nelts);
array->nelts++;
return p;
}
void *
nxt_array_zero_add(nxt_array_t *array)
{
void *p;
p = nxt_array_add(array);
if (nxt_fast_path(p != NULL)) {
nxt_memzero(p, array->size);
}
return p;
}
void
nxt_array_remove(nxt_array_t *array, void *elt)
{
void *last;
last = nxt_array_last(array);
if (elt != last) {
nxt_memcpy(elt, last, array->size);
}
array->nelts--;
}
nxt_array_t *
nxt_array_copy(nxt_mp_t *mp, nxt_array_t *dst, nxt_array_t *src)
{
void *data;
uint32_t i, size;
size = src->size;
if (dst == NULL) {
dst = nxt_array_create(mp, src->nelts, size);
if (nxt_slow_path(dst == NULL)) {
return NULL;
}
}
nxt_assert(size == dst->size);
if (dst->nalloc >= src->nelts) {
nxt_memcpy(dst->elts, src->elts, src->nelts * size);
} else {
nxt_memcpy(dst->elts, src->elts, dst->nelts * size);
for (i = dst->nelts; i < src->nelts; i++) {
data = nxt_array_add(dst);
if (nxt_slow_path(data == NULL)) {
return NULL;
}
nxt_memcpy(data, src->elts + (i * size), size);
}
}
dst->nelts = src->nelts;
return dst;
}
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