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WebSVN – planix.SVN – Blame – /os/branches/planix-v0/sys/src/libbio/bread.c – Rev 2

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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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Bread(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, ic;
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	p = ap;
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	c = count;
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	ic = bp->icount;
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	while(c > 0) {
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		n = -ic;
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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 != Bractive)
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				break;
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			i = read(bp->fid, bp->bbuf, bp->bsize);
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			if(i <= 0) {
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				bp->state = Bracteof;
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				if(i < 0)
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					bp->state = Binactive;
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				break;
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			}
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			bp->gbuf = bp->bbuf;
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			bp->offset += i;
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			if(i < bp->bsize) {
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				memmove(bp->ebuf-i, bp->bbuf, i);
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				bp->gbuf = bp->ebuf-i;
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			}
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			ic = -i;
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			continue;
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		}
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		memmove(p, bp->ebuf+ic, n);
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		c -= n;
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		ic += n;
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		p += n;
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	}
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	bp->icount = ic;
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	if(count == c && bp->state == Binactive)
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		return -1;
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	return count-c;
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}