sys/src/ape/lib/bsd/strncasecmp.c

   1 #include <string.h>
   2
   3 typedef unsigned char uchar;
   4
   5 int
   6 strncasecmp(char *s1, char *s2, int n)
   7 {
   8         int c1, c2;
   9
  10         while(*s1 && n-- > 0){
  11                 c1 = *(uchar*)s1++;
  12                 c2 = *(uchar*)s2++;
  13
  14                 if(c1 == c2)
  15                         continue;
  16
  17                 if(c1 >= 'A' && c1 <= 'Z')
  18                         c1 -= 'A' - 'a';
  19
  20                 if(c2 >= 'A' && c2 <= 'Z')
  21                         c2 -= 'A' - 'a';
  22
  23                 if(c1 != c2)
  24                         return c1 - c2;
  25         }
  26         if(n <= 0)
  27                 return 0;
  28         return -*s2;
  29 }