1/*
2 * Copyright (c) 2014-2020 Pavel Kalvoda <me@pavelkalvoda.com>
3 *
4 * libcbor is free software; you can redistribute it and/or modify
5 * it under the terms of the MIT license. See LICENSE for details.
6 */
7
8#include "stack.h"
9
10struct _cbor_stack _cbor_stack_init(void) {
11  return (struct _cbor_stack){.top = NULL, .size = 0};
12}
13
14void _cbor_stack_pop(struct _cbor_stack *stack) {
15  struct _cbor_stack_record *top = stack->top;
16  stack->top = stack->top->lower;
17  _cbor_free(top);
18  stack->size--;
19}
20
21struct _cbor_stack_record *_cbor_stack_push(struct _cbor_stack *stack,
22                                            cbor_item_t *item,
23                                            size_t subitems) {
24  if (stack->size == CBOR_MAX_STACK_SIZE) return NULL;
25  struct _cbor_stack_record *new_top =
26      _cbor_malloc(sizeof(struct _cbor_stack_record));
27  if (new_top == NULL) return NULL;
28
29  *new_top = (struct _cbor_stack_record){stack->top, item, subitems};
30  stack->top = new_top;
31  stack->size++;
32  return new_top;
33}
34