Convert '@' correctly from PETSCII to ASCII - by leaving it alone.

core/lib/petsciiconv.c

@@ -29,7 +29,7 @@
  *
  * This file is part of the Contiki desktop environment for the C64.
  *
- * $Id: petsciiconv.c,v 1.1 2006/06/17 22:41:18 adamdunkels Exp $
+ * $Id: petsciiconv.c,v 1.2 2010/01/31 23:46:19 oliverschmidt Exp $
  *
  */
 
@@ -90,14 +90,16 @@ petsciiconv_toascii(char *buf, unsigned int len)
     } else if(c == 0x0d) {
       c = 0x0a;
     }
-    switch (c & 0xe0) {
-    case 0x40:                
-    case 0x60:
-      c ^= 0x20;
-      break;
-    case 0xc0:               
-      c ^= 0x80;
-      break;
+    if(c != 0x40) {
+      switch (c & 0xe0) {
+      case 0x40:                
+      case 0x60:
+        c ^= 0x20;
+        break;
+      case 0xc0:               
+        c ^= 0x80;
+        break;
+      }
     }
     *ptr = c & 0x7f;
     ++ptr;