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#include	<string.h>
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int
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memcmp(const void *a1, const void *a2, size_t n)
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{
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	char *s1, *s2;
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	unsigned c1, c2;
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	s1 = a1;
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	s2 = a2;
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	while(n > 0) {
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		c1 = *s1++;
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		c2 = *s2++;
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		if(c1 != c2) {
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			if(c1 > c2)
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				return 1;
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			return -1;
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		}
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		n--;
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	}
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	return 0;
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}