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case_starts.c (299B)

      1 #include "case.h"
      2 
      3 int case_starts(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 (!y) return 1;
     14     if (x != y) return 0;
     15   }
     16 }