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#include <u.h>
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#include <libc.h>
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#include <auth.h>
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uchar
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nvcsum(void *vmem, int n)
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{
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	uchar *mem, sum;
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	int i;
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	sum = 9;
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	mem = vmem;
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	for(i = 0; i < n; i++)
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		sum += mem[i];
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	return sum;
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}