projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| da7c5cc6 KM |
1 | /* |
| 2 | * Copyright (c) 1982 Regents of the University of California. | |
| 3 | * All rights reserved. The Berkeley software License Agreement | |
| 4 | * specifies the terms and conditions for redistribution. | |
| 5 | * | |
| 6 | * @(#)kern_subr.c 6.4 (Berkeley) %G% | |
| 7 | */ | |
| 358708a6 | 8 | |
| 94368568 JB |
9 | #include "param.h" |
| 10 | #include "systm.h" | |
| 11 | #include "dir.h" | |
| 12 | #include "user.h" | |
| 13 | #include "uio.h" | |
| 358708a6 SL |
14 | |
| 15 | uiomove(cp, n, rw, uio) | |
| 16 | register caddr_t cp; | |
| 17 | register int n; | |
| 18 | enum uio_rw rw; | |
| 19 | register struct uio *uio; | |
| 20 | { | |
| 21 | register struct iovec *iov; | |
| 22 | u_int cnt; | |
| 23 | int error = 0; | |
| 24 | ||
| 25 | while (n > 0 && uio->uio_resid) { | |
| 26 | iov = uio->uio_iov; | |
| 27 | cnt = iov->iov_len; | |
| 28 | if (cnt == 0) { | |
| 29 | uio->uio_iov++; | |
| 30 | uio->uio_iovcnt--; | |
| 31 | continue; | |
| 32 | } | |
| 33 | if (cnt > n) | |
| 34 | cnt = n; | |
| 35 | switch (uio->uio_segflg) { | |
| 36 | ||
| c41770c0 KM |
37 | case UIO_USERSPACE: |
| 38 | case UIO_USERISPACE: | |
| 358708a6 SL |
39 | if (rw == UIO_READ) |
| 40 | error = copyout(cp, iov->iov_base, cnt); | |
| 41 | else | |
| 42 | error = copyin(iov->iov_base, cp, cnt); | |
| 43 | if (error) | |
| 44 | return (error); | |
| 45 | break; | |
| 46 | ||
| c41770c0 | 47 | case UIO_SYSSPACE: |
| 358708a6 SL |
48 | if (rw == UIO_READ) |
| 49 | bcopy((caddr_t)cp, iov->iov_base, cnt); | |
| 50 | else | |
| 51 | bcopy(iov->iov_base, (caddr_t)cp, cnt); | |
| 52 | break; | |
| 53 | } | |
| 54 | iov->iov_base += cnt; | |
| 55 | iov->iov_len -= cnt; | |
| 56 | uio->uio_resid -= cnt; | |
| 57 | uio->uio_offset += cnt; | |
| 58 | cp += cnt; | |
| 59 | n -= cnt; | |
| 60 | } | |
| 61 | return (error); | |
| 62 | } | |
| 63 | ||
| 64 | /* | |
| 65 | * Give next character to user as result of read. | |
| 66 | */ | |
| 67 | ureadc(c, uio) | |
| 68 | register int c; | |
| 69 | register struct uio *uio; | |
| 70 | { | |
| 71 | register struct iovec *iov; | |
| 72 | ||
| 73 | again: | |
| 74 | if (uio->uio_iovcnt == 0) | |
| 75 | panic("ureadc"); | |
| 76 | iov = uio->uio_iov; | |
| 77 | if (iov->iov_len <= 0 || uio->uio_resid <= 0) { | |
| 78 | uio->uio_iovcnt--; | |
| 79 | uio->uio_iov++; | |
| 80 | goto again; | |
| 81 | } | |
| 82 | switch (uio->uio_segflg) { | |
| 83 | ||
| c41770c0 | 84 | case UIO_USERSPACE: |
| 358708a6 SL |
85 | if (subyte(iov->iov_base, c) < 0) |
| 86 | return (EFAULT); | |
| 87 | break; | |
| 88 | ||
| c41770c0 | 89 | case UIO_SYSSPACE: |
| 358708a6 SL |
90 | *iov->iov_base = c; |
| 91 | break; | |
| 92 | ||
| c41770c0 | 93 | case UIO_USERISPACE: |
| 358708a6 SL |
94 | if (suibyte(iov->iov_base, c) < 0) |
| 95 | return (EFAULT); | |
| 96 | break; | |
| 97 | } | |
| 98 | iov->iov_base++; | |
| 99 | iov->iov_len--; | |
| 100 | uio->uio_resid--; | |
| 101 | uio->uio_offset++; | |
| 102 | return (0); | |
| 103 | } | |
| 104 | ||
| 105 | #ifdef notdef | |
| 106 | /* | |
| 107 | * Get next character written in by user from uio. | |
| 108 | */ | |
| 109 | uwritec(uio) | |
| 110 | struct uio *uio; | |
| 111 | { | |
| 112 | register struct iovec *iov; | |
| 113 | register int c; | |
| 114 | ||
| 115 | again: | |
| 116 | if (uio->uio_iovcnt <= 0 || uio->uio_resid <= 0) | |
| 117 | panic("uwritec"); | |
| 118 | iov = uio->uio_iov; | |
| 119 | if (iov->iov_len == 0) { | |
| 120 | uio->uio_iovcnt--; | |
| 121 | uio->uio_iov++; | |
| 122 | goto again; | |
| 123 | } | |
| 124 | switch (uio->uio_segflg) { | |
| 125 | ||
| c41770c0 | 126 | case UIO_USERSPACE: |
| 358708a6 SL |
127 | c = fubyte(iov->iov_base); |
| 128 | break; | |
| 129 | ||
| c41770c0 | 130 | case UIO_SYSSPACE: |
| 358708a6 SL |
131 | c = *iov->iov_base & 0377; |
| 132 | break; | |
| 133 | ||
| c41770c0 | 134 | case UIO_USERISPACE: |
| 358708a6 SL |
135 | c = fuibyte(iov->iov_base); |
| 136 | break; | |
| 137 | } | |
| 138 | if (c < 0) | |
| 139 | return (-1); | |
| 140 | iov->iov_base++; | |
| 141 | iov->iov_len--; | |
| 142 | uio->uio_resid--; | |
| 143 | uio->uio_offset++; | |
| 144 | return (c & 0377); | |
| 145 | } | |
| 146 | #endif |