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#include "pool.h"
#include "posix.h"
#ifndef GIT_WIN32
#include <unistd.h>
#endif
struct git_pool_page {
git_pool_page *next;
uint32_t size;
uint32_t avail;
GIT_ALIGN(char data[GIT_FLEX_ARRAY], 8);
};
static void *pool_alloc_page(git_pool *pool, uint32_t size);
uint32_t git_pool__system_page_size(void)
{
static uint32_t size = 0;
if (!size) {
size_t page_size;
if (git__page_size(&page_size) < 0)
page_size = 4096;
/* allow space for malloc overhead */
size = page_size - (2 * sizeof(void *)) - sizeof(git_pool_page);
}
return size;
}
void git_pool_init(git_pool *pool, uint32_t item_size)
{
assert(pool);
assert(item_size >= 1);
memset(pool, 0, sizeof(git_pool));
pool->item_size = item_size;
pool->page_size = git_pool__system_page_size();
}
void git_pool_clear(git_pool *pool)
{
git_pool_page *scan, *next;
for (scan = pool->pages; scan != NULL; scan = next) {
next = scan->next;
git__free(scan);
}
pool->pages = NULL;
}
void git_pool_swap(git_pool *a, git_pool *b)
{
git_pool temp;
if (a == b)
return;
memcpy(&temp, a, sizeof(temp));
memcpy(a, b, sizeof(temp));
memcpy(b, &temp, sizeof(temp));
}
static void *pool_alloc_page(git_pool *pool, uint32_t size)
{
git_pool_page *page;
const uint32_t new_page_size = (size <= pool->page_size) ? pool->page_size : size;
size_t alloc_size;
if (GIT_ADD_SIZET_OVERFLOW(&alloc_size, new_page_size, sizeof(git_pool_page)) ||
!(page = git__malloc(alloc_size)))
return NULL;
page->size = new_page_size;
page->avail = new_page_size - size;
page->next = pool->pages;
pool->pages = page;
return page->data;
}
static void *pool_alloc(git_pool *pool, uint32_t size)
{
git_pool_page *page = pool->pages;
void *ptr = NULL;
if (!page || page->avail < size)
return pool_alloc_page(pool, size);
ptr = &page->data[page->size - page->avail];
page->avail -= size;
return ptr;
}
static uint32_t alloc_size(git_pool *pool, uint32_t count)
{
const uint32_t align = sizeof(void *) - 1;
if (pool->item_size > 1) {
const uint32_t item_size = (pool->item_size + align) & ~align;
return item_size * count;
}
return (count + align) & ~align;
}
void *git_pool_malloc(git_pool *pool, uint32_t items)
{
return pool_alloc(pool, alloc_size(pool, items));
}
void *git_pool_mallocz(git_pool *pool, uint32_t items)
{
const uint32_t size = alloc_size(pool, items);
void *ptr = pool_alloc(pool, size);
if (ptr)
memset(ptr, 0x0, size);
return ptr;
}
char *git_pool_strndup(git_pool *pool, const char *str, size_t n)
{
char *ptr = NULL;
assert(pool && str && pool->item_size == sizeof(char));
if ((uint32_t)(n + 1) < n)
return NULL;
if ((ptr = git_pool_malloc(pool, (uint32_t)(n + 1))) != NULL) {
memcpy(ptr, str, n);
ptr[n] = '\0';
}
return ptr;
}
char *git_pool_strdup(git_pool *pool, const char *str)
{
assert(pool && str && pool->item_size == sizeof(char));
return git_pool_strndup(pool, str, strlen(str));
}
char *git_pool_strdup_safe(git_pool *pool, const char *str)
{
return str ? git_pool_strdup(pool, str) : NULL;
}
char *git_pool_strcat(git_pool *pool, const char *a, const char *b)
{
void *ptr;
size_t len_a, len_b;
assert(pool && pool->item_size == sizeof(char));
len_a = a ? strlen(a) : 0;
len_b = b ? strlen(b) : 0;
if ((ptr = git_pool_malloc(pool, (uint32_t)(len_a + len_b + 1))) != NULL) {
if (len_a)
memcpy(ptr, a, len_a);
if (len_b)
memcpy(((char *)ptr) + len_a, b, len_b);
*(((char *)ptr) + len_a + len_b) = '\0';
}
return ptr;
}
uint32_t git_pool__open_pages(git_pool *pool)
{
uint32_t ct = 0;
git_pool_page *scan;
for (scan = pool->pages; scan != NULL; scan = scan->next) ct++;
return ct;
}
bool git_pool__ptr_in_pool(git_pool *pool, void *ptr)
{
git_pool_page *scan;
for (scan = pool->pages; scan != NULL; scan = scan->next)
if ((void *)scan->data <= ptr &&
(void *)(((char *)scan->data) + scan->size) > ptr)
return true;
return false;
}
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