Commit | Line | Data |
---|---|---|
da7c5cc6 | 1 | /* |
8429d022 | 2 | * Copyright (c) 1982, 1986, 1991 Regents of the University of California. |
6a8af092 | 3 | * All rights reserved. |
da7c5cc6 | 4 | * |
8429d022 MK |
5 | * %sccs.include.redist.c% |
6 | * | |
e335671c | 7 | * @(#)kern_subr.c 7.12 (Berkeley) %G% |
da7c5cc6 | 8 | */ |
358708a6 | 9 | |
38a01dbe KB |
10 | #include <sys/param.h> |
11 | #include <sys/systm.h> | |
12 | #include <sys/proc.h> | |
13 | #include <sys/malloc.h> | |
358708a6 | 14 | |
c4ec2128 | 15 | uiomove(cp, n, uio) |
358708a6 SL |
16 | register caddr_t cp; |
17 | register int n; | |
358708a6 SL |
18 | register struct uio *uio; |
19 | { | |
20 | register struct iovec *iov; | |
21 | u_int cnt; | |
22 | int error = 0; | |
23 | ||
c49c0c2b | 24 | #ifdef DIAGNOSTIC |
c4ec2128 KM |
25 | if (uio->uio_rw != UIO_READ && uio->uio_rw != UIO_WRITE) |
26 | panic("uiomove: mode"); | |
c49c0c2b KM |
27 | if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc) |
28 | panic("uiomove proc"); | |
29 | #endif | |
358708a6 SL |
30 | while (n > 0 && uio->uio_resid) { |
31 | iov = uio->uio_iov; | |
32 | cnt = iov->iov_len; | |
33 | if (cnt == 0) { | |
34 | uio->uio_iov++; | |
35 | uio->uio_iovcnt--; | |
36 | continue; | |
37 | } | |
38 | if (cnt > n) | |
39 | cnt = n; | |
40 | switch (uio->uio_segflg) { | |
41 | ||
c41770c0 KM |
42 | case UIO_USERSPACE: |
43 | case UIO_USERISPACE: | |
c4ec2128 | 44 | if (uio->uio_rw == UIO_READ) |
358708a6 SL |
45 | error = copyout(cp, iov->iov_base, cnt); |
46 | else | |
47 | error = copyin(iov->iov_base, cp, cnt); | |
48 | if (error) | |
49 | return (error); | |
50 | break; | |
51 | ||
c41770c0 | 52 | case UIO_SYSSPACE: |
c4ec2128 | 53 | if (uio->uio_rw == UIO_READ) |
358708a6 SL |
54 | bcopy((caddr_t)cp, iov->iov_base, cnt); |
55 | else | |
56 | bcopy(iov->iov_base, (caddr_t)cp, cnt); | |
57 | break; | |
58 | } | |
59 | iov->iov_base += cnt; | |
60 | iov->iov_len -= cnt; | |
61 | uio->uio_resid -= cnt; | |
62 | uio->uio_offset += cnt; | |
63 | cp += cnt; | |
64 | n -= cnt; | |
65 | } | |
66 | return (error); | |
67 | } | |
68 | ||
69 | /* | |
70 | * Give next character to user as result of read. | |
71 | */ | |
72 | ureadc(c, uio) | |
73 | register int c; | |
74 | register struct uio *uio; | |
75 | { | |
76 | register struct iovec *iov; | |
77 | ||
78 | again: | |
e335671c | 79 | if (uio->uio_iovcnt == 0 || uio->uio_resid == 0) |
358708a6 SL |
80 | panic("ureadc"); |
81 | iov = uio->uio_iov; | |
e335671c | 82 | if (iov->iov_len == 0) { |
358708a6 SL |
83 | uio->uio_iovcnt--; |
84 | uio->uio_iov++; | |
85 | goto again; | |
86 | } | |
87 | switch (uio->uio_segflg) { | |
88 | ||
c41770c0 | 89 | case UIO_USERSPACE: |
358708a6 SL |
90 | if (subyte(iov->iov_base, c) < 0) |
91 | return (EFAULT); | |
92 | break; | |
93 | ||
c41770c0 | 94 | case UIO_SYSSPACE: |
358708a6 SL |
95 | *iov->iov_base = c; |
96 | break; | |
97 | ||
c41770c0 | 98 | case UIO_USERISPACE: |
358708a6 SL |
99 | if (suibyte(iov->iov_base, c) < 0) |
100 | return (EFAULT); | |
101 | break; | |
102 | } | |
103 | iov->iov_base++; | |
104 | iov->iov_len--; | |
105 | uio->uio_resid--; | |
106 | uio->uio_offset++; | |
107 | return (0); | |
108 | } | |
109 | ||
6a8af092 | 110 | #ifdef vax /* unused except by ct.c, other oddities XXX */ |
358708a6 SL |
111 | /* |
112 | * Get next character written in by user from uio. | |
113 | */ | |
114 | uwritec(uio) | |
115 | struct uio *uio; | |
116 | { | |
117 | register struct iovec *iov; | |
118 | register int c; | |
119 | ||
9b428195 MK |
120 | if (uio->uio_resid <= 0) |
121 | return (-1); | |
358708a6 | 122 | again: |
9b428195 | 123 | if (uio->uio_iovcnt <= 0) |
358708a6 SL |
124 | panic("uwritec"); |
125 | iov = uio->uio_iov; | |
126 | if (iov->iov_len == 0) { | |
358708a6 | 127 | uio->uio_iov++; |
9b428195 MK |
128 | if (--uio->uio_iovcnt == 0) |
129 | return (-1); | |
358708a6 SL |
130 | goto again; |
131 | } | |
132 | switch (uio->uio_segflg) { | |
133 | ||
c41770c0 | 134 | case UIO_USERSPACE: |
358708a6 SL |
135 | c = fubyte(iov->iov_base); |
136 | break; | |
137 | ||
c41770c0 | 138 | case UIO_SYSSPACE: |
8429d022 | 139 | c = *(u_char *) iov->iov_base; |
358708a6 SL |
140 | break; |
141 | ||
c41770c0 | 142 | case UIO_USERISPACE: |
358708a6 SL |
143 | c = fuibyte(iov->iov_base); |
144 | break; | |
145 | } | |
146 | if (c < 0) | |
147 | return (-1); | |
148 | iov->iov_base++; | |
149 | iov->iov_len--; | |
150 | uio->uio_resid--; | |
151 | uio->uio_offset++; | |
8429d022 | 152 | return (c); |
358708a6 | 153 | } |
6a8af092 | 154 | #endif /* vax */ |
bb0591a3 KM |
155 | |
156 | /* | |
157 | * General routine to allocate a hash table. | |
158 | */ | |
159 | void * | |
160 | hashinit(elements, type, hashmask) | |
161 | int elements, type; | |
162 | u_long *hashmask; | |
163 | { | |
164 | long hashsize; | |
165 | void *hashtbl; | |
166 | ||
167 | if (elements <= 0) | |
168 | panic("hashinit: bad cnt"); | |
169 | for (hashsize = 1; hashsize <= elements; hashsize <<= 1) | |
170 | continue; | |
171 | hashsize >>= 1; | |
172 | hashtbl = malloc((u_long)hashsize * sizeof(void *), type, M_WAITOK); | |
173 | bzero(hashtbl, hashsize * sizeof(void *)); | |
174 | *hashmask = hashsize - 1; | |
175 | return (hashtbl); | |
176 | } |