projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 94368568 | 1 | /* kern_subr.c 6.3 84/08/29 */ |
| 358708a6 | 2 | |
| 94368568 JB |
3 | #include "param.h" |
| 4 | #include "systm.h" | |
| 5 | #include "dir.h" | |
| 6 | #include "user.h" | |
| 7 | #include "uio.h" | |
| 358708a6 SL |
8 | |
| 9 | uiomove(cp, n, rw, uio) | |
| 10 | register caddr_t cp; | |
| 11 | register int n; | |
| 12 | enum uio_rw rw; | |
| 13 | register struct uio *uio; | |
| 14 | { | |
| 15 | register struct iovec *iov; | |
| 16 | u_int cnt; | |
| 17 | int error = 0; | |
| 18 | ||
| 19 | while (n > 0 && uio->uio_resid) { | |
| 20 | iov = uio->uio_iov; | |
| 21 | cnt = iov->iov_len; | |
| 22 | if (cnt == 0) { | |
| 23 | uio->uio_iov++; | |
| 24 | uio->uio_iovcnt--; | |
| 25 | continue; | |
| 26 | } | |
| 27 | if (cnt > n) | |
| 28 | cnt = n; | |
| 29 | switch (uio->uio_segflg) { | |
| 30 | ||
| c41770c0 KM |
31 | case UIO_USERSPACE: |
| 32 | case UIO_USERISPACE: | |
| 358708a6 SL |
33 | if (rw == UIO_READ) |
| 34 | error = copyout(cp, iov->iov_base, cnt); | |
| 35 | else | |
| 36 | error = copyin(iov->iov_base, cp, cnt); | |
| 37 | if (error) | |
| 38 | return (error); | |
| 39 | break; | |
| 40 | ||
| c41770c0 | 41 | case UIO_SYSSPACE: |
| 358708a6 SL |
42 | if (rw == UIO_READ) |
| 43 | bcopy((caddr_t)cp, iov->iov_base, cnt); | |
| 44 | else | |
| 45 | bcopy(iov->iov_base, (caddr_t)cp, cnt); | |
| 46 | break; | |
| 47 | } | |
| 48 | iov->iov_base += cnt; | |
| 49 | iov->iov_len -= cnt; | |
| 50 | uio->uio_resid -= cnt; | |
| 51 | uio->uio_offset += cnt; | |
| 52 | cp += cnt; | |
| 53 | n -= cnt; | |
| 54 | } | |
| 55 | return (error); | |
| 56 | } | |
| 57 | ||
| 58 | /* | |
| 59 | * Give next character to user as result of read. | |
| 60 | */ | |
| 61 | ureadc(c, uio) | |
| 62 | register int c; | |
| 63 | register struct uio *uio; | |
| 64 | { | |
| 65 | register struct iovec *iov; | |
| 66 | ||
| 67 | again: | |
| 68 | if (uio->uio_iovcnt == 0) | |
| 69 | panic("ureadc"); | |
| 70 | iov = uio->uio_iov; | |
| 71 | if (iov->iov_len <= 0 || uio->uio_resid <= 0) { | |
| 72 | uio->uio_iovcnt--; | |
| 73 | uio->uio_iov++; | |
| 74 | goto again; | |
| 75 | } | |
| 76 | switch (uio->uio_segflg) { | |
| 77 | ||
| c41770c0 | 78 | case UIO_USERSPACE: |
| 358708a6 SL |
79 | if (subyte(iov->iov_base, c) < 0) |
| 80 | return (EFAULT); | |
| 81 | break; | |
| 82 | ||
| c41770c0 | 83 | case UIO_SYSSPACE: |
| 358708a6 SL |
84 | *iov->iov_base = c; |
| 85 | break; | |
| 86 | ||
| c41770c0 | 87 | case UIO_USERISPACE: |
| 358708a6 SL |
88 | if (suibyte(iov->iov_base, c) < 0) |
| 89 | return (EFAULT); | |
| 90 | break; | |
| 91 | } | |
| 92 | iov->iov_base++; | |
| 93 | iov->iov_len--; | |
| 94 | uio->uio_resid--; | |
| 95 | uio->uio_offset++; | |
| 96 | return (0); | |
| 97 | } | |
| 98 | ||
| 99 | #ifdef notdef | |
| 100 | /* | |
| 101 | * Get next character written in by user from uio. | |
| 102 | */ | |
| 103 | uwritec(uio) | |
| 104 | struct uio *uio; | |
| 105 | { | |
| 106 | register struct iovec *iov; | |
| 107 | register int c; | |
| 108 | ||
| 109 | again: | |
| 110 | if (uio->uio_iovcnt <= 0 || uio->uio_resid <= 0) | |
| 111 | panic("uwritec"); | |
| 112 | iov = uio->uio_iov; | |
| 113 | if (iov->iov_len == 0) { | |
| 114 | uio->uio_iovcnt--; | |
| 115 | uio->uio_iov++; | |
| 116 | goto again; | |
| 117 | } | |
| 118 | switch (uio->uio_segflg) { | |
| 119 | ||
| c41770c0 | 120 | case UIO_USERSPACE: |
| 358708a6 SL |
121 | c = fubyte(iov->iov_base); |
| 122 | break; | |
| 123 | ||
| c41770c0 | 124 | case UIO_SYSSPACE: |
| 358708a6 SL |
125 | c = *iov->iov_base & 0377; |
| 126 | break; | |
| 127 | ||
| c41770c0 | 128 | case UIO_USERISPACE: |
| 358708a6 SL |
129 | c = fuibyte(iov->iov_base); |
| 130 | break; | |
| 131 | } | |
| 132 | if (c < 0) | |
| 133 | return (-1); | |
| 134 | iov->iov_base++; | |
| 135 | iov->iov_len--; | |
| 136 | uio->uio_resid--; | |
| 137 | uio->uio_offset++; | |
| 138 | return (c & 0377); | |
| 139 | } | |
| 140 | #endif |