Commit | Line | Data |
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8ad3c13d | 1 | /* Coypright (c) 1980 Regents of the University of California */ |
451260e7 | 2 | static char sccsid[] = "@(#)asio.c 4.2 %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 | ||
28 | #ifdef ASFWRITE | |
29 | /* | |
30 | * This is our version of fwrite... | |
31 | * Hacked out fast version of fwrite that | |
32 | * doesn't iterate over each and every character; | |
33 | * We poke directly into the buffer area, and move things | |
34 | * with a movc3. | |
35 | */ | |
36 | fwrite(p, n, m, f) | |
37 | register char *p; | |
38 | int n, m; | |
39 | register FILE *f; | |
40 | { | |
41 | register int cnt = n * m; | |
42 | register int put; | |
43 | register char *to; | |
44 | ||
45 | top: | |
46 | if (cnt == 0) | |
47 | return; | |
48 | if (f->_cnt) { | |
49 | put = f->_cnt; | |
50 | if (put > cnt) | |
51 | put = cnt; | |
52 | f->_cnt -= put; | |
53 | to = f->_ptr; | |
54 | asm("movc3 r8,(r11),(r7)"); | |
55 | f->_ptr += put; | |
56 | p += put; | |
57 | cnt -= put; | |
58 | goto top; | |
59 | } | |
60 | if (cnt >= BUFSIZ) { | |
61 | fflush(f); | |
62 | put = cnt - cnt % BUFSIZ; | |
63 | if (write(f->_file, p, put) != put) | |
64 | error(1, "Output write error in fwrite"); | |
65 | p += put; | |
66 | cnt -= put; | |
67 | goto top; | |
68 | } | |
69 | _flsbuf(*p++, f); | |
70 | --cnt; | |
71 | goto top; | |
72 | } | |
73 | ||
74 | /* | |
75 | * This has been stolen from the usual place... | |
76 | * It is put here so that the loader doesn't complain | |
77 | * about multiple definitions in the archived object module. | |
78 | * | |
79 | * archived in: /lib/libc.a | |
80 | * object module from: /usr/src/libc/stdio/rdwr.c | |
81 | */ | |
82 | fread(ptr, size, count, iop) | |
83 | unsigned size, count; | |
84 | register char *ptr; | |
85 | register FILE *iop; | |
86 | { | |
87 | register c; | |
88 | unsigned ndone, s; | |
89 | ||
90 | ndone = 0; | |
91 | if (size) | |
92 | for (; ndone<count; ndone++) { | |
93 | s = size; | |
94 | do { | |
95 | if ((c = getc(iop)) >= 0) | |
96 | *ptr++ = c; | |
97 | else | |
98 | return(ndone); | |
99 | } while (--s); | |
100 | } | |
101 | return(ndone); | |
102 | } | |
103 | #endif ASFWRITE | |
104 | ||
105 | bopen(bp, off) | |
106 | struct biobuf *bp; | |
107 | off_t off; | |
108 | { | |
109 | ||
110 | bp->b_ptr = bp->b_buf; | |
111 | bp->b_nleft = BUFSIZ - off % BUFSIZ; | |
112 | bp->b_off = off; | |
113 | bp->b_link = biobufs; | |
114 | biobufs = bp; | |
115 | } | |
116 | ||
117 | int bwrerror; | |
118 | ||
119 | bwrite(p, cnt, bp) | |
120 | register char *p; | |
121 | register int cnt; | |
122 | register struct biobuf *bp; | |
123 | { | |
124 | register int put; | |
125 | register char *to; | |
126 | ||
127 | top: | |
128 | if (cnt == 0) | |
129 | return; | |
130 | if (bp->b_nleft) { | |
131 | put = bp->b_nleft; | |
132 | if (put > cnt) | |
133 | put = cnt; | |
134 | bp->b_nleft -= put; | |
135 | to = bp->b_ptr; | |
136 | asm("movc3 r8,(r11),(r7)"); | |
137 | bp->b_ptr += put; | |
138 | p += put; | |
139 | cnt -= put; | |
140 | goto top; | |
141 | } | |
142 | if (cnt >= BUFSIZ) { | |
143 | if (bp->b_ptr != bp->b_buf) | |
144 | bflush1(bp); | |
145 | put = cnt - cnt % BUFSIZ; | |
146 | if (boffset != bp->b_off) | |
147 | lseek(biofd, bp->b_off, 0); | |
148 | if (write(biofd, p, put) != put) { | |
149 | bwrerror = 1; | |
150 | error(1, "Output write error"); | |
151 | } | |
152 | bp->b_off += put; | |
153 | boffset = bp->b_off; | |
154 | p += put; | |
155 | cnt -= put; | |
156 | goto top; | |
157 | } | |
158 | bflush1(bp); | |
159 | goto top; | |
160 | } | |
161 | ||
162 | bflush() | |
163 | { | |
164 | register struct biobuf *bp; | |
165 | ||
166 | if (bwrerror) | |
167 | return; | |
168 | for (bp = biobufs; bp; bp = bp->b_link) | |
169 | bflush1(bp); | |
170 | } | |
171 | ||
172 | bflush1(bp) | |
173 | register struct biobuf *bp; | |
174 | { | |
175 | register int cnt = bp->b_ptr - bp->b_buf; | |
176 | ||
177 | if (cnt == 0) | |
178 | return; | |
179 | if (boffset != bp->b_off) | |
180 | lseek(biofd, bp->b_off, 0); | |
181 | if (write(biofd, bp->b_buf, cnt) != cnt) { | |
182 | bwrerror = 1; | |
183 | error(1, "Output write error"); | |
184 | } | |
185 | bp->b_off += cnt; | |
186 | boffset = bp->b_off; | |
187 | bp->b_ptr = bp->b_buf; | |
188 | bp->b_nleft = BUFSIZ; | |
189 | } | |
190 | ||
191 | bflushc(bp, c) | |
192 | register struct biobuf *bp; | |
193 | char c; | |
194 | { | |
195 | ||
196 | bflush1(bp); | |
197 | bputc(c, bp); | |
198 | } |