1 #include	"lib9.h"
2 #include	<bio.h>
3 
4 long
5 Bwrite(Biobuf *bp, void *ap, long count)
6 {
7 	long c;
8 	unsigned char *p;
9 	int i, n, oc;
10 
11 	p = ap;
12 	c = count;
13 	oc = bp->ocount;
14 
15 	while(c > 0) {
16 		n = -oc;
17 		if(n > c)
18 			n = c;
19 		if(n == 0) {
20 			if(bp->state != Bwactive)
21 				return Beof;
22 			i = write(bp->fid, bp->bbuf, bp->bsize);
23 			if(i != bp->bsize) {
24 				bp->state = Binactive;
25 				return Beof;
26 			}
27 			bp->offset += i;
28 			oc = -bp->bsize;
29 			continue;
30 		}
31 		memmove(bp->ebuf+oc, p, n);
32 		oc += n;
33 		c -= n;
34 		p += n;
35 	}
36 	bp->ocount = oc;
37 	return count-c;
38 }