static char linebuf[LBSIZE + 1];
/* the magic array for case-independence */
-static char cc[] = {
+static unsigned char cc[] = {
0000,0001,0002,0003,0004,0005,0006,0007,
0010,0011,0012,0013,0014,0015,0016,0017,
0020,0021,0022,0023,0024,0025,0026,0027,