Commit | Line | Data |
---|---|---|
8ad3c13d | 1 | /* Coypright (c) 1980 Regents of the University of California */ |
bef6dadc | 2 | static char sccsid[] = "@(#)asio.c 4.3 %G%"; |
8ad3c13d | 3 | #include <stdio.h> |
8ad3c13d BJ |
4 | #include "as.h" |
5 | /* | |
6 | * Block I/O routines for logical I/O concurrently in | |
7 | * more than one place in the same file. | |
8 | */ | |
9 | int biofd; /* file descriptor for block I/O file */ | |
10 | off_t boffset; /* physical position in logical file */ | |
11 | BFILE *biobufs; /* the block I/O buffers */ | |
12 | ||
13 | #define error(severity, message) \ | |
14 | {yyerror(message); if (severity) delexit();} | |
15 | ||
16 | Flushfield(n) | |
17 | register int n; | |
18 | { | |
19 | while (n>0) { | |
20 | outb(bitfield); | |
21 | bitfield >>= 8; | |
22 | n -= 8; | |
23 | } | |
24 | bitoff=0; | |
25 | bitfield=0; | |
26 | } | |
27 | ||
8ad3c13d | 28 | /* |
bef6dadc | 29 | * Block I/O Routines |
8ad3c13d | 30 | */ |
8ad3c13d BJ |
31 | bopen(bp, off) |
32 | struct biobuf *bp; | |
33 | off_t off; | |
34 | { | |
35 | ||
36 | bp->b_ptr = bp->b_buf; | |
37 | bp->b_nleft = BUFSIZ - off % BUFSIZ; | |
38 | bp->b_off = off; | |
39 | bp->b_link = biobufs; | |
40 | biobufs = bp; | |
41 | } | |
42 | ||
43 | int bwrerror; | |
44 | ||
45 | bwrite(p, cnt, bp) | |
46 | register char *p; | |
47 | register int cnt; | |
48 | register struct biobuf *bp; | |
49 | { | |
50 | register int put; | |
51 | register char *to; | |
52 | ||
53 | top: | |
54 | if (cnt == 0) | |
55 | return; | |
56 | if (bp->b_nleft) { | |
57 | put = bp->b_nleft; | |
58 | if (put > cnt) | |
59 | put = cnt; | |
60 | bp->b_nleft -= put; | |
61 | to = bp->b_ptr; | |
62 | asm("movc3 r8,(r11),(r7)"); | |
63 | bp->b_ptr += put; | |
64 | p += put; | |
65 | cnt -= put; | |
66 | goto top; | |
67 | } | |
68 | if (cnt >= BUFSIZ) { | |
69 | if (bp->b_ptr != bp->b_buf) | |
70 | bflush1(bp); | |
71 | put = cnt - cnt % BUFSIZ; | |
72 | if (boffset != bp->b_off) | |
73 | lseek(biofd, bp->b_off, 0); | |
74 | if (write(biofd, p, put) != put) { | |
75 | bwrerror = 1; | |
76 | error(1, "Output write error"); | |
77 | } | |
78 | bp->b_off += put; | |
79 | boffset = bp->b_off; | |
80 | p += put; | |
81 | cnt -= put; | |
82 | goto top; | |
83 | } | |
84 | bflush1(bp); | |
85 | goto top; | |
86 | } | |
87 | ||
88 | bflush() | |
89 | { | |
90 | register struct biobuf *bp; | |
91 | ||
92 | if (bwrerror) | |
93 | return; | |
94 | for (bp = biobufs; bp; bp = bp->b_link) | |
95 | bflush1(bp); | |
96 | } | |
97 | ||
98 | bflush1(bp) | |
99 | register struct biobuf *bp; | |
100 | { | |
101 | register int cnt = bp->b_ptr - bp->b_buf; | |
102 | ||
103 | if (cnt == 0) | |
104 | return; | |
105 | if (boffset != bp->b_off) | |
106 | lseek(biofd, bp->b_off, 0); | |
107 | if (write(biofd, bp->b_buf, cnt) != cnt) { | |
108 | bwrerror = 1; | |
109 | error(1, "Output write error"); | |
110 | } | |
111 | bp->b_off += cnt; | |
112 | boffset = bp->b_off; | |
113 | bp->b_ptr = bp->b_buf; | |
114 | bp->b_nleft = BUFSIZ; | |
115 | } | |
116 | ||
117 | bflushc(bp, c) | |
118 | register struct biobuf *bp; | |
119 | char c; | |
120 | { | |
121 | ||
122 | bflush1(bp); | |
123 | bputc(c, bp); | |
124 | } |