Commit | Line | Data |
---|---|---|
f70ab843 | 1 | /* |
bcf1365c DF |
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. | |
f70ab843 | 5 | */ |
bcf1365c | 6 | |
f70ab843 | 7 | #ifndef lint |
95f51977 | 8 | static char sccsid[] = "@(#)asio.c 5.1 (Berkeley) 4/30/85"; |
f70ab843 RH |
9 | #endif not lint |
10 | ||
8ad3c13d | 11 | #include <stdio.h> |
8ad3c13d BJ |
12 | #include "as.h" |
13 | /* | |
14 | * Block I/O routines for logical I/O concurrently in | |
15 | * more than one place in the same file. | |
16 | */ | |
17 | int biofd; /* file descriptor for block I/O file */ | |
8192c7f0 | 18 | int biobufsize; /* optimal block size for I/O */ |
8ad3c13d BJ |
19 | off_t boffset; /* physical position in logical file */ |
20 | BFILE *biobufs; /* the block I/O buffers */ | |
21 | ||
22 | #define error(severity, message) \ | |
23 | {yyerror(message); if (severity) delexit();} | |
24 | ||
25 | Flushfield(n) | |
26 | register int n; | |
27 | { | |
28 | while (n>0) { | |
29 | outb(bitfield); | |
30 | bitfield >>= 8; | |
31 | n -= 8; | |
32 | } | |
33 | bitoff=0; | |
34 | bitfield=0; | |
35 | } | |
36 | ||
8ad3c13d | 37 | /* |
bef6dadc | 38 | * Block I/O Routines |
8ad3c13d | 39 | */ |
8ad3c13d BJ |
40 | bopen(bp, off) |
41 | struct biobuf *bp; | |
42 | off_t off; | |
43 | { | |
44 | ||
8192c7f0 RC |
45 | bp->b_ptr = bp->b_buf = Calloc(1, biobufsize); |
46 | bp->b_nleft = biobufsize - (off % biobufsize); | |
8ad3c13d BJ |
47 | bp->b_off = off; |
48 | bp->b_link = biobufs; | |
49 | biobufs = bp; | |
50 | } | |
51 | ||
52 | int bwrerror; | |
53 | ||
54 | bwrite(p, cnt, bp) | |
55 | register char *p; | |
56 | register int cnt; | |
57 | register struct biobuf *bp; | |
58 | { | |
59 | register int put; | |
60 | register char *to; | |
61 | ||
62 | top: | |
63 | if (cnt == 0) | |
64 | return; | |
65 | if (bp->b_nleft) { | |
66 | put = bp->b_nleft; | |
67 | if (put > cnt) | |
68 | put = cnt; | |
69 | bp->b_nleft -= put; | |
70 | to = bp->b_ptr; | |
f70ab843 RH |
71 | #ifdef lint |
72 | *to = *to; | |
73 | #endif lint | |
8ad3c13d BJ |
74 | asm("movc3 r8,(r11),(r7)"); |
75 | bp->b_ptr += put; | |
76 | p += put; | |
77 | cnt -= put; | |
78 | goto top; | |
79 | } | |
8192c7f0 | 80 | if (cnt >= biobufsize) { |
8ad3c13d BJ |
81 | if (bp->b_ptr != bp->b_buf) |
82 | bflush1(bp); | |
8192c7f0 | 83 | put = cnt - cnt % biobufsize; |
8ad3c13d | 84 | if (boffset != bp->b_off) |
f70ab843 | 85 | (void)lseek(biofd, (long)bp->b_off, 0); |
8ad3c13d BJ |
86 | if (write(biofd, p, put) != put) { |
87 | bwrerror = 1; | |
88 | error(1, "Output write error"); | |
89 | } | |
90 | bp->b_off += put; | |
91 | boffset = bp->b_off; | |
92 | p += put; | |
93 | cnt -= put; | |
94 | goto top; | |
95 | } | |
96 | bflush1(bp); | |
97 | goto top; | |
98 | } | |
99 | ||
100 | bflush() | |
101 | { | |
102 | register struct biobuf *bp; | |
103 | ||
104 | if (bwrerror) | |
105 | return; | |
106 | for (bp = biobufs; bp; bp = bp->b_link) | |
107 | bflush1(bp); | |
108 | } | |
109 | ||
110 | bflush1(bp) | |
111 | register struct biobuf *bp; | |
112 | { | |
113 | register int cnt = bp->b_ptr - bp->b_buf; | |
114 | ||
115 | if (cnt == 0) | |
116 | return; | |
117 | if (boffset != bp->b_off) | |
f70ab843 | 118 | (void)lseek(biofd, (long)bp->b_off, 0); |
8ad3c13d BJ |
119 | if (write(biofd, bp->b_buf, cnt) != cnt) { |
120 | bwrerror = 1; | |
121 | error(1, "Output write error"); | |
122 | } | |
123 | bp->b_off += cnt; | |
124 | boffset = bp->b_off; | |
125 | bp->b_ptr = bp->b_buf; | |
8192c7f0 | 126 | bp->b_nleft = biobufsize; |
8ad3c13d BJ |
127 | } |
128 | ||
129 | bflushc(bp, c) | |
130 | register struct biobuf *bp; | |
131 | char c; | |
132 | { | |
8ad3c13d BJ |
133 | bflush1(bp); |
134 | bputc(c, bp); | |
135 | } |