blob: 8ad61960ced8bb0bdf5fd7a860b770a613366614 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
#include <u.h>
#include <libc.h>
#include <bio.h>
long
Bread(Biobufhdr *bp, void *ap, long count)
{
long c;
uchar *p;
int i, n, ic;
p = ap;
c = count;
ic = bp->icount;
while(c > 0) {
n = -ic;
if(n > c)
n = c;
if(n == 0) {
if(bp->state != Bractive)
break;
i = bp->iof(bp, bp->bbuf, bp->bsize);
if(i <= 0) {
bp->state = Bracteof;
if(i < 0) {
Berror(bp, "read error: %r");
bp->state = Binactive;
}
break;
}
bp->gbuf = bp->bbuf;
bp->offset += i;
if(i < bp->bsize) {
memmove(bp->ebuf-i, bp->bbuf, i);
bp->gbuf = bp->ebuf-i;
}
ic = -i;
continue;
}
memmove(p, bp->ebuf+ic, n);
c -= n;
ic += n;
p += n;
}
bp->icount = ic;
if(count == c && bp->state == Binactive)
return -1;
return count-c;
}
|
