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#include <u.h>
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#include <libc.h>
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static
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long
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ioreadv(int fd, IOchunk *io, int nio, vlong offset)
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{
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	int i;
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	long m, n, tot;
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	char *buf, *p;
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	tot = 0;
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	for(i=0; i<nio; i++)
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		tot += io[i].len;
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	buf = malloc(tot);
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	if(buf == nil)
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		return -1;
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	tot = pread(fd, buf, tot, offset);
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	p = buf;
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	n = tot;
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	for(i=0; i<nio; i++){
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		if(n <= 0)
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			break;
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		m = io->len;
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		if(m > n)
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			m = n;
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		memmove(io->addr, p, m);
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		n -= m;
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		p += m;
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		io++;
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	}
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	free(buf);
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	return tot;
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}
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long
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readv(int fd, IOchunk *io, int nio)
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{
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	return ioreadv(fd, io, nio, -1LL);
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}
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long
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preadv(int fd, IOchunk *io, int nio, vlong off)
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{
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	return ioreadv(fd, io, nio, off);
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}