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1 #include <u.h>2 #include <libc.h>4 int5 cistrncmp(char *s1, char *s2, int n)6 {7 int c1, c2;9 while(*s1 && n-- > 0){10 c1 = *(uchar*)s1++;11 c2 = *(uchar*)s2++;13 if(c1 == c2)14 continue;16 if(c1 >= 'A' && c1 <= 'Z')17 c1 -= 'A' - 'a';19 if(c2 >= 'A' && c2 <= 'Z')20 c2 -= 'A' - 'a';22 if(c1 != c2)23 return c1 - c2;24 }25 if(n <= 0)26 return 0;27 return -*s2;28 }