void *sys_alloc(u64 length)
{
	assert(length);
	void *result = VirtualAlloc(0, length, MEM_COMMIT|MEM_RESERVE, PAGE_READWRITE);
	return result;
}

void sys_free(void *memory, u64 length)
{
	assert(memory);
	assert(length);
	assert(VirtualFree(memory, 0, MEM_RELEASE));
}

u64 sys_read_file(arena_t *arena, char **buffer, const char *filename)
{
	*buffer = 0;

	HANDLE file = CreateFile(filename, GENERIC_READ, FILE_SHARE_READ,
		0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
	if (file == INVALID_HANDLE_VALUE) {
		printf("error: failed to open file \"%s\"\n", filename);
		return 0;
	}

	LARGE_INTEGER lisize;
	if (!GetFileSizeEx(file, &lisize)) {
		printf("error: failed to get size of the file \"%s\"", filename);
		CloseHandle(file);
		return 0;
	}

	u64 size = lisize.QuadPart;
	if (!size) {
		printf("error: file \"%s\" is empty", filename);
		CloseHandle(file);
		return 0;
	}

	*buffer = push_arena(arena, size + 1);

	DWORD bytes_read;
	if (!ReadFile(file, *buffer, size, &bytes_read, 0)) {
		CloseHandle(file);
		pop_arena(arena, size);
		printf("error: failed to read file \"%s\", bytes read: %lu\n", filename, bytes_read);
		return 0;
	}
	CloseHandle(file);

	*(*buffer + size) = 0;

	return size + 1;
}

char *sys_getbindir(arena_t *arena)
{
	char path[MAX_PATH];
	u32 len = GetModuleFileName(0, path, MAX_PATH);
	if (!len) {
		printf("error: failed to get file path\n");
		return 0;
	}

	char *dir = strrchr(path, '\\');
	assert(dir);
	assert(dir > path);

	len = dir - path;
	dir = push_arena(arena, len + 1);
	prb_memmove(dir, path, len);
	dir[len] = 0;

	return dir;
}