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case_diffs.c (352B)

      1 #include "case.h"
      2 
      3 int case_diffs(char *s, char *t)
      4 {
      5   unsigned char x;
      6   unsigned char y;
      7 
      8   for (;;) {
      9     x = *s++ - 'A';
     10     if (x <= 'Z' - 'A') x += 'a'; else x += 'A';
     11     y = *t++ - 'A';
     12     if (y <= 'Z' - 'A') y += 'a'; else y += 'A';
     13     if (x != y) break;
     14     if (!x) break;
     15   }
     16   return ((int)(unsigned int) x) - ((int)(unsigned int) y);
     17 }