[isisd] Fix compiler warnings and allow v4-only compilation

2006-12-08 Hannes Gredler <hannes@gredler.at>

	* isis_adjacency.c: (isis_new_adj) Allow NULL snpa argument.
	* isis_pdu.c: (various) Update calls to isis_new_adj() to pass
	  NULL and use default.
	* (general) Add forward declarations where required.
	  Fix up const char *'s.
	  Allow V4-only compilation.
diff --git a/isisd/isis_misc.h b/isisd/isis_misc.h
index 3b97589..d5003a8 100644
--- a/isisd/isis_misc.h
+++ b/isisd/isis_misc.h
@@ -24,8 +24,7 @@
 #ifndef _ZEBRA_ISIS_MISC_H
 #define _ZEBRA_ISIS_MISC_H
 
-int dotformat2buff (u_char *, u_char *);
-int string2circuit_t (u_char *);
+int string2circuit_t (const u_char *);
 const char *circuit_t2string (int);
 const char *syst2string (int);
 struct in_addr newprefix2inaddr (u_char * prefix_start,
@@ -34,7 +33,7 @@
  * Converting input to memory stored format
  * return value of 0 indicates wrong input
  */
-int dotformat2buff (u_char *, u_char *);
+int dotformat2buff (u_char *, const u_char *);
 int sysid2buff (u_char *, const u_char *);
 
 /*