Function acl_vstring_mmap_alloc2

lib_acl/src/stdlib/acl_vstring.c:346–392

static acl_pthread_once_t __once_control = ACL_PTHREAD_ONCE_INIT;

ACL_VSTRING *acl_vstring_mmap_alloc2(ACL_FILE_HANDLE fd,
	size_t max_len, size_t init_len, size_t offset)
{
	const char *myname = "acl_vstring_mmap_alloc";
	ACL_VSTRING *vp;

	if (init_len < 1) {
		acl_msg_panic("%s: bad length %ld", myname, (long) init_len);
	}

	if (offset > 0) {
		int n = offset % __page_size  == 0 ? 0 : 1;
		acl_pthread_once(&__once_control, get_pagesize);
		offset = (n + offset / __page_size) * __page_size;
	}

	if (max_len < init_len) {
		max_len = init_len;
	}

	if (max_len < offset) {
		max_len = offset;
	}

	vp = (ACL_VSTRING *) acl_mymalloc(sizeof(*vp));


	vp->vbuf.flags     = ACL_VBUF_FLAG_MMAP;
	vp->vbuf.len       = init_len;
#if 0
	vp->vbuf.get_ready = acl_vstring_get_ready;
	vp->vbuf.put_ready = acl_vstring_put_ready;
	vp->vbuf.space     = acl_vstring_space;
#endif
	vp->maxlen         = max_len;
	vp->vbuf.alloc.slice = NULL;
	vp->vbuf.fd        = fd;
#if defined(_WIN32) || defined(_WIN64)
	vp->vbuf.hmap      = NULL;
#endif

	mmap_buf_init(vp, offset);

	ACL_VSTRING_RESET(vp);
	vp->vbuf.data[0] = 0;
	return vp;
}

/* acl_vstring_free - destroy variable-length string */