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#include <unistd.h>
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#include <string.h>
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#include <sys/uio.h>
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int
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readv(int fd, struct iovec *v, int ent)
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{
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	int x, i, n, len;
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	char buf[10*1024];
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	for(len = i = 0; i < ent; i++)
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		len += v[i].iov_len;
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	if(len > sizeof(buf))
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		len = sizeof(buf);
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	len = read(fd, buf, len);
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	if(len <= 0)
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		return len;
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	for(n = i = 0; n < len && i < ent; i++){
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		x = len - n;
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		if(x > v[i].iov_len)
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			x = v[i].iov_len;
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		memmove(v[i].iov_base, buf + n, x);
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		n += x;
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	}
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	return len;
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}