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#include	<u.h>
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#include	<libc.h>
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#include	<bio.h>
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long
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Bwrite(Biobufhdr *bp, void *ap, long count)
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{
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	long c;
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	uchar *p;
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	int i, n, oc;
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	char errbuf[ERRMAX];
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	p = ap;
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	c = count;
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	oc = bp->ocount;
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	while(c > 0) {
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		n = -oc;
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		if(n > c)
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			n = c;
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		if(n == 0) {
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			if(bp->state != Bwactive)
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				return Beof;
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			i = write(bp->fid, bp->bbuf, bp->bsize);
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			if(i != bp->bsize) {
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				errstr(errbuf, sizeof errbuf);
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				if(strstr(errbuf, "interrupt") == nil)
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					bp->state = Binactive;
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				errstr(errbuf, sizeof errbuf);
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				return Beof;
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			}
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			bp->offset += i;
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			oc = -bp->bsize;
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			continue;
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		}
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		memmove(bp->ebuf+oc, p, n);
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		oc += n;
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		c -= n;
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		p += n;
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	}
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	bp->ocount = oc;
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	return count-c;
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}