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	cistrncmp.c - 9base - revived minimalist port of Plan 9 userland to Unix
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	cistrncmp.c (366B)
	---
	1 #include <u.h>
	2 #include <libc.h>
	3
	4 int
	5 cistrncmp(char s1, char s2, int n)
	6 {
	7 int c1, c2;
	8
	9 while(*s1 && n-- > 0){
	10 c1 = (uchar)s1++;
	11 c2 = (uchar)s2++;
	12
	13 if(c1 == c2)
	14 continue;
	15
	16 if(c1 >= 'A' && c1 <= 'Z')
	17 c1 -= 'A' - 'a';
	18
	19 if(c2 >= 'A' && c2 <= 'Z')
	20 c2 -= 'A' - 'a';
	21
	22 if(c1 != c2)
	23 return c1 - c2;
	24 }
	25 if(n <= 0)
	26 return 0;
	27 return -*s2;
	28 }