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1.1 nbrk 1: /* $OpenBSD: criov.c,v 1.16 2006/12/29 13:04:37 pedro Exp $ */
2:
3: /*
4: * Copyright (c) 1999 Theo de Raadt
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: *
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: *
16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26: */
27:
28: #include <sys/param.h>
29: #include <sys/systm.h>
30: #include <sys/proc.h>
31: #include <sys/errno.h>
32: #include <sys/malloc.h>
33: #include <sys/kernel.h>
34: #include <sys/mbuf.h>
35:
36: #include <uvm/uvm_extern.h>
37:
38: #include <crypto/cryptodev.h>
39:
40: void
41: cuio_copydata(struct uio *uio, int off, int len, caddr_t cp)
42: {
43: struct iovec *iov = uio->uio_iov;
44: int iol = uio->uio_iovcnt;
45: unsigned count;
46:
47: if (off < 0)
48: panic("cuio_copydata: off %d < 0", off);
49: if (len < 0)
50: panic("cuio_copydata: len %d < 0", len);
51: while (off > 0) {
52: if (iol == 0)
53: panic("iov_copydata: empty in skip");
54: if (off < iov->iov_len)
55: break;
56: off -= iov->iov_len;
57: iol--;
58: iov++;
59: }
60: while (len > 0) {
61: if (iol == 0)
62: panic("cuio_copydata: empty");
63: count = min(iov->iov_len - off, len);
64: bcopy(((caddr_t)iov->iov_base) + off, cp, count);
65: len -= count;
66: cp += count;
67: off = 0;
68: iol--;
69: iov++;
70: }
71: }
72:
73: void
74: cuio_copyback(struct uio *uio, int off, int len, const void *_cp)
75: {
76: struct iovec *iov = uio->uio_iov;
77: int iol = uio->uio_iovcnt;
78: unsigned count;
79: caddr_t cp = (caddr_t)_cp;
80:
81: if (off < 0)
82: panic("cuio_copyback: off %d < 0", off);
83: if (len < 0)
84: panic("cuio_copyback: len %d < 0", len);
85: while (off > 0) {
86: if (iol == 0)
87: panic("cuio_copyback: empty in skip");
88: if (off < iov->iov_len)
89: break;
90: off -= iov->iov_len;
91: iol--;
92: iov++;
93: }
94: while (len > 0) {
95: if (iol == 0)
96: panic("uio_copyback: empty");
97: count = min(iov->iov_len - off, len);
98: bcopy(cp, ((caddr_t)iov->iov_base) + off, count);
99: len -= count;
100: cp += count;
101: off = 0;
102: iol--;
103: iov++;
104: }
105: }
106:
107: int
108: cuio_getptr(struct uio *uio, int loc, int *off)
109: {
110: int ind, len;
111:
112: ind = 0;
113: while (loc >= 0 && ind < uio->uio_iovcnt) {
114: len = uio->uio_iov[ind].iov_len;
115: if (len > loc) {
116: *off = loc;
117: return (ind);
118: }
119: loc -= len;
120: ind++;
121: }
122:
123: if (ind > 0 && loc == 0) {
124: ind--;
125: *off = uio->uio_iov[ind].iov_len;
126: return (ind);
127: }
128:
129: return (-1);
130: }
131:
132: int
133: cuio_apply(struct uio *uio, int off, int len,
134: int (*f)(caddr_t, caddr_t, unsigned int), caddr_t fstate)
135: {
136: int rval, ind, uiolen;
137: unsigned int count;
138:
139: if (len < 0)
140: panic("cuio_apply: len %d < 0", len);
141: if (off < 0)
142: panic("cuio_apply: off %d < 0", off);
143:
144: ind = 0;
145: while (off > 0) {
146: if (ind >= uio->uio_iovcnt)
147: panic("cuio_apply: ind %d >= uio_iovcnt %d for off",
148: ind, uio->uio_iovcnt);
149: uiolen = uio->uio_iov[ind].iov_len;
150: if (off < uiolen)
151: break;
152: off -= uiolen;
153: ind++;
154: }
155: while (len > 0) {
156: if (ind >= uio->uio_iovcnt)
157: panic("cuio_apply: ind %d >= uio_iovcnt %d for len",
158: ind, uio->uio_iovcnt);
159: count = min(uio->uio_iov[ind].iov_len - off, len);
160:
161: rval = f(fstate, (char *)uio->uio_iov[ind].iov_base + off,
162: count);
163: if (rval)
164: return (rval);
165:
166: len -= count;
167: off = 0;
168: ind++;
169: }
170:
171: return (0);
172: }