mirror of
https://github.com/freebsd/freebsd-src
synced 2024-07-22 10:48:02 +00:00
af8cafb2a3
A set of convenience macros to initialize struct iovec's and increment the base and length together. IOVEC_INIT - sets iov_base and iov_len IOVEC_INIT_CSTR - takes a string and sets iov_len to strlen + 1 IOVEC_INIT_OBJ - takes an object and sets iov_len to sizeof obj IOVEC_ADVANCE - increments iov_base and decrements iov_len On CheriBSD these present the opportunity to insert more precise bounds on some objects and hide differences in casts in hybrid kernels (where some, but not all pointers are capabilities and require annotation). Here in FreeBSD the resulting code is tidier, particularly in the IOVEC_ADVANCE case where the need to cast iov_base to (char *) is avoided. Reviewed by: kib Feedback from: des, jrtc27 MFC after: 1 week Sponsored by: AFRL, DARPA Differential Revision: https://reviews.freebsd.org/D45422
72 lines
2.6 KiB
C
72 lines
2.6 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*
|
|
* Copyright (c) 1982, 1986, 1993, 1994
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef _SYS__IOVEC_H_
|
|
#define _SYS__IOVEC_H_
|
|
|
|
#include <sys/_types.h>
|
|
|
|
#ifndef _SIZE_T_DECLARED
|
|
typedef __size_t size_t;
|
|
#define _SIZE_T_DECLARED
|
|
#endif
|
|
|
|
struct iovec {
|
|
void *iov_base; /* Base address. */
|
|
size_t iov_len; /* Length. */
|
|
};
|
|
|
|
#ifdef _KERNEL
|
|
#define IOVEC_INIT(iovp, base, len) \
|
|
*(iovp) = (struct iovec){ .iov_base = (base), .iov_len = (len) }
|
|
|
|
/* String with length including NUL terminator */
|
|
#define IOVEC_INIT_CSTR(iovp, str) do { \
|
|
void *__str = (str); \
|
|
IOVEC_INIT(iovp, __str, strlen(__str) + 1); \
|
|
} while(0)
|
|
|
|
/* Object with size from sizeof() */
|
|
#define IOVEC_INIT_OBJ(iovp, obj) \
|
|
IOVEC_INIT(iovp, &(obj), sizeof(obj))
|
|
|
|
#define IOVEC_ADVANCE(iovp, amt) do { \
|
|
struct iovec *__iovp = (iovp); \
|
|
size_t __amt = (amt); \
|
|
KASSERT(__amt <= __iovp->iov_len, ("%s: amount %zu > iov_len \
|
|
%zu", __func__, __amt, __iovp->iov_len)); \
|
|
__iovp->iov_len -= __amt; \
|
|
__iovp->iov_base = (char *)__iovp->iov_base + __amt; \
|
|
} while(0)
|
|
#endif /* _KERNEL */
|
|
|
|
#endif /* !_SYS__IOVEC_H_ */
|