1 #include "case.h"
2 
case_lowers(char * s)3 void case_lowers(char *s) {
4   unsigned char x;
5   for (;;) {
6     if (!(x=*s)) break;
7     if ((x -= 'A') <= 'Z' - 'A') *s = x + 'a';
8     ++s;
9   }
10 }
11