1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
27 /* All Rights Reserved */
28
29 /*
30 * University Copyright- Copyright (c) 1982, 1986, 1988
31 * The Regents of the University of California
32 * All Rights Reserved
33 *
34 * University Acknowledgment- Portions of this document are derived from
35 * software developed by the University of California, Berkeley, and its
36 * contributors.
37 */
38
39 /*
40 * $FreeBSD: stable/9/sys/cddl/compat/opensolaris/kern/opensolaris_uio.c 209962 2010-07-12 23:49:04Z mm $
41 */
42
43 #include <sys/types.h>
44 #include <sys/uio.h>
45
46 /*
47 * same as uiomove() but doesn't modify uio structure.
48 * return in cbytes how many bytes were copied.
49 */
50 int
uiocopy(void * p,size_t n,enum uio_rw rw,struct uio * uio,size_t * cbytes)51 uiocopy(void *p, size_t n, enum uio_rw rw, struct uio *uio, size_t *cbytes)
52 {
53 struct iovec *iov;
54 ulong_t cnt;
55 int error, iovcnt;
56
57 iovcnt = uio->uio_iovcnt;
58 *cbytes = 0;
59
60 for (iov = uio->uio_iov; n > 0 && iovcnt > 0; iov++, iovcnt--) {
61 cnt = MIN(iov->iov_len, n);
62 if (cnt == 0)
63 continue;
64
65 switch (uio->uio_segflg) {
66 case UIO_USERSPACE:
67 if (rw == UIO_READ)
68 error = copyout(p, iov->iov_base, cnt);
69 else
70 error = copyin(iov->iov_base, p, cnt);
71 if (error)
72 return (error);
73 break;
74 case UIO_SYSSPACE:
75 if (uio->uio_rw == UIO_READ)
76 bcopy(p, iov->iov_base, cnt);
77 else
78 bcopy(iov->iov_base, p, cnt);
79 break;
80 }
81
82 p = (caddr_t)p + cnt;
83 n -= cnt;
84 *cbytes += cnt;
85 }
86 return (0);
87 }
88
89 /*
90 * Drop the next n chars out of *uiop.
91 */
92 void
uioskip(uio_t * uiop,size_t n)93 uioskip(uio_t *uiop, size_t n)
94 {
95 if (n > uiop->uio_resid)
96 return;
97 while (n != 0) {
98 register iovec_t *iovp = uiop->uio_iov;
99 register size_t niovb = MIN(iovp->iov_len, n);
100
101 if (niovb == 0) {
102 uiop->uio_iov++;
103 uiop->uio_iovcnt--;
104 continue;
105 }
106 iovp->iov_base += niovb;
107 uiop->uio_loffset += niovb;
108 iovp->iov_len -= niovb;
109 uiop->uio_resid -= niovb;
110 n -= niovb;
111 }
112 }
113