1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32#ifndef _SYS__IOVEC_H_ 33#define _SYS__IOVEC_H_ 34 35#include <sys/_types.h> 36 37#ifndef _SIZE_T_DECLARED 38typedef __size_t size_t; 39#define _SIZE_T_DECLARED 40#endif 41 42struct iovec { 43 void *iov_base; /* Base address. */ 44 size_t iov_len; /* Length. */ 45}; 46 47#ifdef _KERNEL 48#define IOVEC_INIT(iovp, base, len) \ 49 *(iovp) = (struct iovec){ .iov_base = (base), .iov_len = (len) } 50 51/* String with length including NUL terminator */ 52#define IOVEC_INIT_CSTR(iovp, str) do { \ 53 void *__str = (str); \ 54 IOVEC_INIT(iovp, __str, strlen(__str) + 1); \ 55} while(0) 56 57/* Object with size from sizeof() */ 58#define IOVEC_INIT_OBJ(iovp, obj) \ 59 IOVEC_INIT(iovp, &(obj), sizeof(obj)) 60 61#define IOVEC_ADVANCE(iovp, amt) do { \ 62 struct iovec *__iovp = (iovp); \ 63 size_t __amt = (amt); \ 64 KASSERT(__amt <= __iovp->iov_len, ("%s: amount %zu > iov_len \ 65 %zu", __func__, __amt, __iovp->iov_len)); \ 66 __iovp->iov_len -= __amt; \ 67 __iovp->iov_base = (char *)__iovp->iov_base + __amt; \ 68} while(0) 69#endif /* _KERNEL */ 70 71#endif /* !_SYS__IOVEC_H_ */ 72