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#include <string.h>
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typedef unsigned char uchar;
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int
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strncasecmp(char *s1, char *s2, int n)
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{
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	int c1, c2;
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	while(*s1 && n-- > 0){
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		c1 = *(uchar*)s1++;
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		c2 = *(uchar*)s2++;
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		if(c1 == c2)
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			continue;
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		if(c1 >= 'A' && c1 <= 'Z')
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			c1 -= 'A' - 'a';
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		if(c2 >= 'A' && c2 <= 'Z')
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			c2 -= 'A' - 'a';
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		if(c1 != c2)
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			return c1 - c2;
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	}
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	if(n <= 0)
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		return 0;
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	return -*s2;
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}