projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| da7c5cc6 | 1 | /* |
| 0880b18e | 2 | * Copyright (c) 1982, 1986 Regents of the University of California. |
| da7c5cc6 KM |
3 | * All rights reserved. The Berkeley software License Agreement |
| 4 | * specifies the terms and conditions for redistribution. | |
| 5 | * | |
| 94e9d67d | 6 | * @(#)kern_subr.c 7.4 (Berkeley) %G% |
| da7c5cc6 | 7 | */ |
| 358708a6 | 8 | |
| 94368568 JB |
9 | #include "param.h" |
| 10 | #include "systm.h" | |
| 94368568 | 11 | #include "user.h" |
| 358708a6 | 12 | |
| c4ec2128 | 13 | uiomove(cp, n, uio) |
| 358708a6 SL |
14 | register caddr_t cp; |
| 15 | register int n; | |
| 358708a6 SL |
16 | register struct uio *uio; |
| 17 | { | |
| 18 | register struct iovec *iov; | |
| 19 | u_int cnt; | |
| 20 | int error = 0; | |
| 21 | ||
| c4ec2128 KM |
22 | if (uio->uio_rw != UIO_READ && uio->uio_rw != UIO_WRITE) |
| 23 | panic("uiomove: mode"); | |
| 358708a6 SL |
24 | while (n > 0 && uio->uio_resid) { |
| 25 | iov = uio->uio_iov; | |
| 26 | cnt = iov->iov_len; | |
| 27 | if (cnt == 0) { | |
| 28 | uio->uio_iov++; | |
| 29 | uio->uio_iovcnt--; | |
| 30 | continue; | |
| 31 | } | |
| 32 | if (cnt > n) | |
| 33 | cnt = n; | |
| 34 | switch (uio->uio_segflg) { | |
| 35 | ||
| c41770c0 KM |
36 | case UIO_USERSPACE: |
| 37 | case UIO_USERISPACE: | |
| c4ec2128 | 38 | if (uio->uio_rw == UIO_READ) |
| 358708a6 SL |
39 | error = copyout(cp, iov->iov_base, cnt); |
| 40 | else | |
| 41 | error = copyin(iov->iov_base, cp, cnt); | |
| 42 | if (error) | |
| 43 | return (error); | |
| 44 | break; | |
| 45 | ||
| c41770c0 | 46 | case UIO_SYSSPACE: |
| c4ec2128 | 47 | if (uio->uio_rw == UIO_READ) |
| 358708a6 SL |
48 | bcopy((caddr_t)cp, iov->iov_base, cnt); |
| 49 | else | |
| 50 | bcopy(iov->iov_base, (caddr_t)cp, cnt); | |
| 51 | break; | |
| 52 | } | |
| 53 | iov->iov_base += cnt; | |
| 54 | iov->iov_len -= cnt; | |
| 55 | uio->uio_resid -= cnt; | |
| 56 | uio->uio_offset += cnt; | |
| 57 | cp += cnt; | |
| 58 | n -= cnt; | |
| 59 | } | |
| 60 | return (error); | |
| 61 | } | |
| 62 | ||
| 63 | /* | |
| 64 | * Give next character to user as result of read. | |
| 65 | */ | |
| 66 | ureadc(c, uio) | |
| 67 | register int c; | |
| 68 | register struct uio *uio; | |
| 69 | { | |
| 70 | register struct iovec *iov; | |
| 71 | ||
| 72 | again: | |
| 73 | if (uio->uio_iovcnt == 0) | |
| 74 | panic("ureadc"); | |
| 75 | iov = uio->uio_iov; | |
| 76 | if (iov->iov_len <= 0 || uio->uio_resid <= 0) { | |
| 77 | uio->uio_iovcnt--; | |
| 78 | uio->uio_iov++; | |
| 79 | goto again; | |
| 80 | } | |
| 81 | switch (uio->uio_segflg) { | |
| 82 | ||
| c41770c0 | 83 | case UIO_USERSPACE: |
| 358708a6 SL |
84 | if (subyte(iov->iov_base, c) < 0) |
| 85 | return (EFAULT); | |
| 86 | break; | |
| 87 | ||
| c41770c0 | 88 | case UIO_SYSSPACE: |
| 358708a6 SL |
89 | *iov->iov_base = c; |
| 90 | break; | |
| 91 | ||
| c41770c0 | 92 | case UIO_USERISPACE: |
| 358708a6 SL |
93 | if (suibyte(iov->iov_base, c) < 0) |
| 94 | return (EFAULT); | |
| 95 | break; | |
| 96 | } | |
| 97 | iov->iov_base++; | |
| 98 | iov->iov_len--; | |
| 99 | uio->uio_resid--; | |
| 100 | uio->uio_offset++; | |
| 101 | return (0); | |
| 102 | } | |
| 103 | ||
| 514c3fd2 MT |
104 | strcat(src, append) |
| 105 | register char *src, *append; | |
| 106 | { | |
| 107 | ||
| 108 | for (; *src; ++src) | |
| 109 | /* void */; | |
| 110 | while (*src++ = *append++) | |
| 111 | /* void */; | |
| 112 | } | |
| 113 | ||
| 114 | strcpy(to, from) | |
| 115 | register char *to, *from; | |
| 116 | { | |
| 117 | ||
| 118 | for (; *from = *to; ++from, ++to) | |
| 119 | /* void */; | |
| 120 | } | |
| 121 | ||
| 122 | strncpy(to, from, cnt) | |
| 123 | register char *to, *from; | |
| 124 | register int cnt; | |
| 125 | { | |
| 126 | ||
| 127 | for (; cnt && (*to = *from); --cnt, ++from, ++to) | |
| 128 | /* void */; | |
| 129 | *to = '\0'; | |
| 130 | } | |
| 131 | ||
| 94e9d67d | 132 | #ifndef lint /* unused except by ct.c, other oddities */ |
| 358708a6 SL |
133 | /* |
| 134 | * Get next character written in by user from uio. | |
| 135 | */ | |
| 136 | uwritec(uio) | |
| 137 | struct uio *uio; | |
| 138 | { | |
| 139 | register struct iovec *iov; | |
| 140 | register int c; | |
| 141 | ||
| 9b428195 MK |
142 | if (uio->uio_resid <= 0) |
| 143 | return (-1); | |
| 358708a6 | 144 | again: |
| 9b428195 | 145 | if (uio->uio_iovcnt <= 0) |
| 358708a6 SL |
146 | panic("uwritec"); |
| 147 | iov = uio->uio_iov; | |
| 148 | if (iov->iov_len == 0) { | |
| 358708a6 | 149 | uio->uio_iov++; |
| 9b428195 MK |
150 | if (--uio->uio_iovcnt == 0) |
| 151 | return (-1); | |
| 358708a6 SL |
152 | goto again; |
| 153 | } | |
| 154 | switch (uio->uio_segflg) { | |
| 155 | ||
| c41770c0 | 156 | case UIO_USERSPACE: |
| 358708a6 SL |
157 | c = fubyte(iov->iov_base); |
| 158 | break; | |
| 159 | ||
| c41770c0 | 160 | case UIO_SYSSPACE: |
| 358708a6 SL |
161 | c = *iov->iov_base & 0377; |
| 162 | break; | |
| 163 | ||
| c41770c0 | 164 | case UIO_USERISPACE: |
| 358708a6 SL |
165 | c = fuibyte(iov->iov_base); |
| 166 | break; | |
| 167 | } | |
| 168 | if (c < 0) | |
| 169 | return (-1); | |
| 170 | iov->iov_base++; | |
| 171 | iov->iov_len--; | |
| 172 | uio->uio_resid--; | |
| 173 | uio->uio_offset++; | |
| 174 | return (c & 0377); | |
| 175 | } | |
| 514c3fd2 | 176 | #endif /* notdef */ |