Introduced burn_drive_enumerator_t to allow more complete sg-freebsd implementation

libburn/sg-linux.c

@@ -121,18 +121,25 @@ int sg_handle_busy_device(char *fname, int os_errno)
 
 /* ts A60922 ticket 33 */
 /** Returns the next index number and the next enumerated drive address.
-    @param idx An opaque number handle. Make no own theories about it.
+    @param idx An opaque handle. Make no own theories about it.
     @param adr Takes the reply
     @param adr_size Gives maximum size of reply including final 0
-    @param initialize  1 = start new, 0 = continue, use no other values for now
+    @param initialize  1 = start new,
+                       0 = continue, use no other values for now
+                      -1 = finish
     @return 1 = reply is a valid address , 0 = no further address available
            -1 = severe error (e.g. adr_size too small)
 */
-int sg_give_next_adr(int *idx, char adr[], int adr_size, int initialize)
+int sg_give_next_adr(burn_drive_enumerator_t *idx,
+		     char adr[], int adr_size, int initialize)
 {
+	/* sg.h : typedef int burn_drive_enumerator_t; */
 	static int sg_limit = 32, ata_limit = 26;
 	int baseno = 0;
 
+	if (initialize == -1)
+		return 0;
+
 	if (initialize  == 1)
 		*idx = -1;
 	(*idx)++;