91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
#include "cig.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <stdbool.h>
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void *borrow_allocator_alloc_func(borrow_allocator_t *this, size_t bytes) {
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linked_allocation_node_t *node = malloc(sizeof(*this->head) + bytes);
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if (node == NULL) { return NULL; }
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node->prev = NULL;
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node->next = this->head;
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if (this->head != NULL) {
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assert(this->head->prev == NULL);
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this->head->prev = node;
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}
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this->head = node;
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return &node->data;
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}
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void *borrow_allocator_resize_func(borrow_allocator_t *this, void *old_ptr, size_t bytes) {
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linked_allocation_node_t *old_node = PTR_FROM_FIELD_PTR(linked_allocation_node_t, data, old_ptr);
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linked_allocation_node_t *new_node = realloc(old_node, sizeof(*old_node) + bytes);
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if (new_node == NULL) { return NULL; }
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if (this->head == old_node) {
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assert(new_node->prev == NULL);
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this->head = new_node;
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}
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if (new_node->prev != NULL) { new_node->prev->next = new_node; }
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if (new_node->next != NULL) { new_node->next->prev = new_node; }
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return &new_node->data;
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}
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void borrow_allocator_free(borrow_allocator_t *this, void *old_ptr) {
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linked_allocation_node_t *node = PTR_FROM_FIELD_PTR(linked_allocation_node_t, data, old_ptr);
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if (node->prev != NULL) { node->prev->next = node->next; }
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if (node->next != NULL) { node->next->prev = node->prev; }
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if (this->head == node) {
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assert(node->prev == NULL);
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if (node->next != NULL) { assert(node->next->prev == NULL); }
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this->head = node->next;
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}
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free(node);
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}
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void borrow_allocator_free_all(borrow_allocator_t *this) {
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if (this->head == NULL) {
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return;
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}
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assert(this->head->prev == NULL);
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void *prev = NULL;
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for (linked_allocation_node_t *node = this->head; node != NULL; node = node->next) {
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free(prev);
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prev = node;
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}
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free(prev);
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this->head = NULL;
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}
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size_t borrow_allocator_count_allocations(borrow_allocator_t *this) {
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size_t output = 0;
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for (linked_allocation_node_t *node = this->head; node != NULL; node = node->next) {
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output++;
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}
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return output;
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}
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static void *borrow_alloc_impl(void *this, size_t bytes) {
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return borrow_allocator_alloc_func(this, bytes);
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}
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static void *borrow_resize_impl(void *this, void *old_ptr, size_t bytes) {
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return borrow_allocator_resize_func(this, old_ptr, bytes);
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}
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static void borrow_reset(void *this) {
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borrow_allocator_free_all(this);
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}
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static const allocator_vtbl_t borrow_vtbl = {
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.alloc = borrow_alloc_impl,
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.resize = borrow_resize_impl,
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.reset = borrow_reset,
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};
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allocator_t allocator_from_borrow(borrow_allocator_t *this) {
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return (allocator_t) {
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.this=this,
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.vtbl=&borrow_vtbl,
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};
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}
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