| 1 | /* |
| 2 | * Copyright (c) 1982 Regents of the University of California |
| 3 | */ |
| 4 | #ifndef lint |
| 5 | static char sccsid[] = "@(#)asio.c 4.4 %G%"; |
| 6 | #endif not lint |
| 7 | |
| 8 | #include <stdio.h> |
| 9 | #include "as.h" |
| 10 | /* |
| 11 | * Block I/O routines for logical I/O concurrently in |
| 12 | * more than one place in the same file. |
| 13 | */ |
| 14 | int biofd; /* file descriptor for block I/O file */ |
| 15 | off_t boffset; /* physical position in logical file */ |
| 16 | BFILE *biobufs; /* the block I/O buffers */ |
| 17 | |
| 18 | #define error(severity, message) \ |
| 19 | {yyerror(message); if (severity) delexit();} |
| 20 | |
| 21 | Flushfield(n) |
| 22 | register int n; |
| 23 | { |
| 24 | while (n>0) { |
| 25 | outb(bitfield); |
| 26 | bitfield >>= 8; |
| 27 | n -= 8; |
| 28 | } |
| 29 | bitoff=0; |
| 30 | bitfield=0; |
| 31 | } |
| 32 | |
| 33 | /* |
| 34 | * Block I/O Routines |
| 35 | */ |
| 36 | bopen(bp, off) |
| 37 | struct biobuf *bp; |
| 38 | off_t off; |
| 39 | { |
| 40 | |
| 41 | bp->b_ptr = bp->b_buf; |
| 42 | bp->b_nleft = BUFSIZ - off % BUFSIZ; |
| 43 | bp->b_off = off; |
| 44 | bp->b_link = biobufs; |
| 45 | biobufs = bp; |
| 46 | } |
| 47 | |
| 48 | int bwrerror; |
| 49 | |
| 50 | bwrite(p, cnt, bp) |
| 51 | register char *p; |
| 52 | register int cnt; |
| 53 | register struct biobuf *bp; |
| 54 | { |
| 55 | register int put; |
| 56 | register char *to; |
| 57 | |
| 58 | top: |
| 59 | if (cnt == 0) |
| 60 | return; |
| 61 | if (bp->b_nleft) { |
| 62 | put = bp->b_nleft; |
| 63 | if (put > cnt) |
| 64 | put = cnt; |
| 65 | bp->b_nleft -= put; |
| 66 | to = bp->b_ptr; |
| 67 | #ifdef lint |
| 68 | *to = *to; |
| 69 | #endif lint |
| 70 | asm("movc3 r8,(r11),(r7)"); |
| 71 | bp->b_ptr += put; |
| 72 | p += put; |
| 73 | cnt -= put; |
| 74 | goto top; |
| 75 | } |
| 76 | if (cnt >= BUFSIZ) { |
| 77 | if (bp->b_ptr != bp->b_buf) |
| 78 | bflush1(bp); |
| 79 | put = cnt - cnt % BUFSIZ; |
| 80 | if (boffset != bp->b_off) |
| 81 | (void)lseek(biofd, (long)bp->b_off, 0); |
| 82 | if (write(biofd, p, put) != put) { |
| 83 | bwrerror = 1; |
| 84 | error(1, "Output write error"); |
| 85 | } |
| 86 | bp->b_off += put; |
| 87 | boffset = bp->b_off; |
| 88 | p += put; |
| 89 | cnt -= put; |
| 90 | goto top; |
| 91 | } |
| 92 | bflush1(bp); |
| 93 | goto top; |
| 94 | } |
| 95 | |
| 96 | bflush() |
| 97 | { |
| 98 | register struct biobuf *bp; |
| 99 | |
| 100 | if (bwrerror) |
| 101 | return; |
| 102 | for (bp = biobufs; bp; bp = bp->b_link) |
| 103 | bflush1(bp); |
| 104 | } |
| 105 | |
| 106 | bflush1(bp) |
| 107 | register struct biobuf *bp; |
| 108 | { |
| 109 | register int cnt = bp->b_ptr - bp->b_buf; |
| 110 | |
| 111 | if (cnt == 0) |
| 112 | return; |
| 113 | if (boffset != bp->b_off) |
| 114 | (void)lseek(biofd, (long)bp->b_off, 0); |
| 115 | if (write(biofd, bp->b_buf, cnt) != cnt) { |
| 116 | bwrerror = 1; |
| 117 | error(1, "Output write error"); |
| 118 | } |
| 119 | bp->b_off += cnt; |
| 120 | boffset = bp->b_off; |
| 121 | bp->b_ptr = bp->b_buf; |
| 122 | bp->b_nleft = BUFSIZ; |
| 123 | } |
| 124 | |
| 125 | bflushc(bp, c) |
| 126 | register struct biobuf *bp; |
| 127 | char c; |
| 128 | { |
| 129 | bflush1(bp); |
| 130 | bputc(c, bp); |
| 131 | } |