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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
ngx_array_t *
ngx_array_create(ngx_pool_t *p, ngx_uint_t n, size_t size)
{
ngx_array_t *a;
a = ngx_palloc(p, sizeof(ngx_array_t));
if (a == NULL) {
return NULL;
}
if (ngx_array_init(a, p, n, size) != NGX_OK) {
return NULL;
}
return a;
}
void
ngx_array_destroy(ngx_array_t *a)
{
ngx_pool_t *p;
p = a->pool;
if ((u_char *) a->elts + a->size * a->nalloc == p->d.last) {
p->d.last -= a->size * a->nalloc;
}
if ((u_char *) a + sizeof(ngx_array_t) == p->d.last) {
p->d.last = (u_char *) a;
}
}
void *
ngx_array_push(ngx_array_t *a)
{
void *elt, *new;
size_t size;
ngx_pool_t *p;
if (a->nelts == a->nalloc) {
/* the array is full */
size = a->size * a->nalloc;
p = a->pool;
if ((u_char *) a->elts + size == p->d.last
&& p->d.last + a->size <= p->d.end)
{
/*
* the array allocation is the last in the pool
* and there is space for new allocation
*/
p->d.last += a->size;
a->nalloc++;
} else {
/* allocate a new array */
new = ngx_palloc(p, 2 * size);
if (new == NULL) {
return NULL;
}
ngx_memcpy(new, a->elts, size);
a->elts = new;
a->nalloc *= 2;
}
}
elt = (u_char *) a->elts + a->size * a->nelts;
a->nelts++;
return elt;
}
void *
ngx_array_push_n(ngx_array_t *a, ngx_uint_t n)
{
void *elt, *new;
size_t size;
ngx_uint_t nalloc;
ngx_pool_t *p;
size = n * a->size;
if (a->nelts + n > a->nalloc) {
/* the array is full */
p = a->pool;
if ((u_char *) a->elts + a->size * a->nalloc == p->d.last
&& p->d.last + size <= p->d.end)
{
/*
* the array allocation is the last in the pool
* and there is space for new allocation
*/
p->d.last += size;
a->nalloc += n;
} else {
/* allocate a new array */
nalloc = 2 * ((n >= a->nalloc) ? n : a->nalloc);
new = ngx_palloc(p, nalloc * a->size);
if (new == NULL) {
return NULL;
}
ngx_memcpy(new, a->elts, a->nelts * a->size);
a->elts = new;
a->nalloc = nalloc;
}
}
elt = (u_char *) a->elts + a->size * a->nelts;
a->nelts += n;
return elt;
}
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