1 b2cfc4e2 2003-09-30 devnull #include	"lib9.h"
 2 b2cfc4e2 2003-09-30 devnull #include	<bio.h>
 3 b2cfc4e2 2003-09-30 devnull 
 4 b2cfc4e2 2003-09-30 devnull long
 5 b2cfc4e2 2003-09-30 devnull Bread(Biobuf *bp, void *ap, long count)
 6 b2cfc4e2 2003-09-30 devnull {
 7 b2cfc4e2 2003-09-30 devnull 	long c;
 8 b2cfc4e2 2003-09-30 devnull 	unsigned char *p;
 9 b2cfc4e2 2003-09-30 devnull 	int i, n, ic;
10 b2cfc4e2 2003-09-30 devnull 
11 b2cfc4e2 2003-09-30 devnull 	p = ap;
12 b2cfc4e2 2003-09-30 devnull 	c = count;
13 b2cfc4e2 2003-09-30 devnull 	ic = bp->icount;
14 b2cfc4e2 2003-09-30 devnull 
15 b2cfc4e2 2003-09-30 devnull 	while(c > 0) {
16 b2cfc4e2 2003-09-30 devnull 		n = -ic;
17 b2cfc4e2 2003-09-30 devnull 		if(n > c)
18 b2cfc4e2 2003-09-30 devnull 			n = c;
19 b2cfc4e2 2003-09-30 devnull 		if(n == 0) {
20 b2cfc4e2 2003-09-30 devnull 			if(bp->state != Bractive)
21 b2cfc4e2 2003-09-30 devnull 				break;
22 b2cfc4e2 2003-09-30 devnull 			i = read(bp->fid, bp->bbuf, bp->bsize);
23 b2cfc4e2 2003-09-30 devnull 			if(i <= 0) {
24 b2cfc4e2 2003-09-30 devnull 				bp->state = Bracteof;
25 b2cfc4e2 2003-09-30 devnull 				if(i < 0)
26 b2cfc4e2 2003-09-30 devnull 					bp->state = Binactive;
27 b2cfc4e2 2003-09-30 devnull 				break;
28 b2cfc4e2 2003-09-30 devnull 			}
29 b2cfc4e2 2003-09-30 devnull 			bp->gbuf = bp->bbuf;
30 b2cfc4e2 2003-09-30 devnull 			bp->offset += i;
31 b2cfc4e2 2003-09-30 devnull 			if(i < bp->bsize) {
32 b2cfc4e2 2003-09-30 devnull 				memmove(bp->ebuf-i, bp->bbuf, i);
33 b2cfc4e2 2003-09-30 devnull 				bp->gbuf = bp->ebuf-i;
34 b2cfc4e2 2003-09-30 devnull 			}
35 b2cfc4e2 2003-09-30 devnull 			ic = -i;
36 b2cfc4e2 2003-09-30 devnull 			continue;
37 b2cfc4e2 2003-09-30 devnull 		}
38 b2cfc4e2 2003-09-30 devnull 		memmove(p, bp->ebuf+ic, n);
39 b2cfc4e2 2003-09-30 devnull 		c -= n;
40 b2cfc4e2 2003-09-30 devnull 		ic += n;
41 b2cfc4e2 2003-09-30 devnull 		p += n;
42 b2cfc4e2 2003-09-30 devnull 	}
43 b2cfc4e2 2003-09-30 devnull 	bp->icount = ic;
44 b2cfc4e2 2003-09-30 devnull 	return count-c;
45 b2cfc4e2 2003-09-30 devnull }