add functions `krb5_principal_get_realm' and

`krb5_principal_get_comp_string' that returns parts of a principal;
this is a replacement for the internal `krb5_princ_realm' and
`krb5_princ_component' macros that everyone seem to use


git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@10136 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/krb5/principal.c

@@ -59,6 +59,23 @@ krb5_free_principal(krb5_context context,
     }
 }
 
+const char *
+krb5_principal_get_realm(krb5_context context,
+			 krb5_principal principal)
+{
+    return princ_realm(principal);
+}			 
+
+const char *
+krb5_principal_get_comp_string(krb5_context context,
+			       krb5_principal principal,
+			       unsigned int component)
+{
+    if(component >= princ_num_comp(principal))
+       return NULL;
+    return princ_ncomp(principal, component);
+}
+
 krb5_error_code
 krb5_parse_name(krb5_context context,
 		const char *name,