Commit | Line | Data |
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8ad3c13d BJ |
1 | /* Coypright (c) 1980 Regents of the University of California */ |
2 | static char sccsid[] = "@(#)asio.c 4.1 %G%"; | |
3 | #include <stdio.h> | |
4 | #include <sys/types.h> | |
5 | #include "as.h" | |
6 | /* | |
7 | * Block I/O routines for logical I/O concurrently in | |
8 | * more than one place in the same file. | |
9 | */ | |
10 | int biofd; /* file descriptor for block I/O file */ | |
11 | off_t boffset; /* physical position in logical file */ | |
12 | BFILE *biobufs; /* the block I/O buffers */ | |
13 | ||
14 | #define error(severity, message) \ | |
15 | {yyerror(message); if (severity) delexit();} | |
16 | ||
17 | Flushfield(n) | |
18 | register int n; | |
19 | { | |
20 | while (n>0) { | |
21 | outb(bitfield); | |
22 | bitfield >>= 8; | |
23 | n -= 8; | |
24 | } | |
25 | bitoff=0; | |
26 | bitfield=0; | |
27 | } | |
28 | ||
29 | #ifdef ASFWRITE | |
30 | /* | |
31 | * This is our version of fwrite... | |
32 | * Hacked out fast version of fwrite that | |
33 | * doesn't iterate over each and every character; | |
34 | * We poke directly into the buffer area, and move things | |
35 | * with a movc3. | |
36 | */ | |
37 | fwrite(p, n, m, f) | |
38 | register char *p; | |
39 | int n, m; | |
40 | register FILE *f; | |
41 | { | |
42 | register int cnt = n * m; | |
43 | register int put; | |
44 | register char *to; | |
45 | ||
46 | top: | |
47 | if (cnt == 0) | |
48 | return; | |
49 | if (f->_cnt) { | |
50 | put = f->_cnt; | |
51 | if (put > cnt) | |
52 | put = cnt; | |
53 | f->_cnt -= put; | |
54 | to = f->_ptr; | |
55 | asm("movc3 r8,(r11),(r7)"); | |
56 | f->_ptr += put; | |
57 | p += put; | |
58 | cnt -= put; | |
59 | goto top; | |
60 | } | |
61 | if (cnt >= BUFSIZ) { | |
62 | fflush(f); | |
63 | put = cnt - cnt % BUFSIZ; | |
64 | if (write(f->_file, p, put) != put) | |
65 | error(1, "Output write error in fwrite"); | |
66 | p += put; | |
67 | cnt -= put; | |
68 | goto top; | |
69 | } | |
70 | _flsbuf(*p++, f); | |
71 | --cnt; | |
72 | goto top; | |
73 | } | |
74 | ||
75 | /* | |
76 | * This has been stolen from the usual place... | |
77 | * It is put here so that the loader doesn't complain | |
78 | * about multiple definitions in the archived object module. | |
79 | * | |
80 | * archived in: /lib/libc.a | |
81 | * object module from: /usr/src/libc/stdio/rdwr.c | |
82 | */ | |
83 | fread(ptr, size, count, iop) | |
84 | unsigned size, count; | |
85 | register char *ptr; | |
86 | register FILE *iop; | |
87 | { | |
88 | register c; | |
89 | unsigned ndone, s; | |
90 | ||
91 | ndone = 0; | |
92 | if (size) | |
93 | for (; ndone<count; ndone++) { | |
94 | s = size; | |
95 | do { | |
96 | if ((c = getc(iop)) >= 0) | |
97 | *ptr++ = c; | |
98 | else | |
99 | return(ndone); | |
100 | } while (--s); | |
101 | } | |
102 | return(ndone); | |
103 | } | |
104 | #endif ASFWRITE | |
105 | ||
106 | bopen(bp, off) | |
107 | struct biobuf *bp; | |
108 | off_t off; | |
109 | { | |
110 | ||
111 | bp->b_ptr = bp->b_buf; | |
112 | bp->b_nleft = BUFSIZ - off % BUFSIZ; | |
113 | bp->b_off = off; | |
114 | bp->b_link = biobufs; | |
115 | biobufs = bp; | |
116 | } | |
117 | ||
118 | int bwrerror; | |
119 | ||
120 | bwrite(p, cnt, bp) | |
121 | register char *p; | |
122 | register int cnt; | |
123 | register struct biobuf *bp; | |
124 | { | |
125 | register int put; | |
126 | register char *to; | |
127 | ||
128 | top: | |
129 | if (cnt == 0) | |
130 | return; | |
131 | if (bp->b_nleft) { | |
132 | put = bp->b_nleft; | |
133 | if (put > cnt) | |
134 | put = cnt; | |
135 | bp->b_nleft -= put; | |
136 | to = bp->b_ptr; | |
137 | asm("movc3 r8,(r11),(r7)"); | |
138 | bp->b_ptr += put; | |
139 | p += put; | |
140 | cnt -= put; | |
141 | goto top; | |
142 | } | |
143 | if (cnt >= BUFSIZ) { | |
144 | if (bp->b_ptr != bp->b_buf) | |
145 | bflush1(bp); | |
146 | put = cnt - cnt % BUFSIZ; | |
147 | if (boffset != bp->b_off) | |
148 | lseek(biofd, bp->b_off, 0); | |
149 | if (write(biofd, p, put) != put) { | |
150 | bwrerror = 1; | |
151 | error(1, "Output write error"); | |
152 | } | |
153 | bp->b_off += put; | |
154 | boffset = bp->b_off; | |
155 | p += put; | |
156 | cnt -= put; | |
157 | goto top; | |
158 | } | |
159 | bflush1(bp); | |
160 | goto top; | |
161 | } | |
162 | ||
163 | bflush() | |
164 | { | |
165 | register struct biobuf *bp; | |
166 | ||
167 | if (bwrerror) | |
168 | return; | |
169 | for (bp = biobufs; bp; bp = bp->b_link) | |
170 | bflush1(bp); | |
171 | } | |
172 | ||
173 | bflush1(bp) | |
174 | register struct biobuf *bp; | |
175 | { | |
176 | register int cnt = bp->b_ptr - bp->b_buf; | |
177 | ||
178 | if (cnt == 0) | |
179 | return; | |
180 | if (boffset != bp->b_off) | |
181 | lseek(biofd, bp->b_off, 0); | |
182 | if (write(biofd, bp->b_buf, cnt) != cnt) { | |
183 | bwrerror = 1; | |
184 | error(1, "Output write error"); | |
185 | } | |
186 | bp->b_off += cnt; | |
187 | boffset = bp->b_off; | |
188 | bp->b_ptr = bp->b_buf; | |
189 | bp->b_nleft = BUFSIZ; | |
190 | } | |
191 | ||
192 | bflushc(bp, c) | |
193 | register struct biobuf *bp; | |
194 | char c; | |
195 | { | |
196 | ||
197 | bflush1(bp); | |
198 | bputc(c, bp); | |
199 | } |