sys/src/libc/port/cistrncmp.c

   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 }