From db1326aa5e39711d88d305ac08a0afa137ab77f0 Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Wed, 1 Mar 2000 11:32:23 +0000
Subject: [PATCH] Dynamic attributes are now declared in per-protocol grammar
 files instead of filter/config.Y. Bird now compiles even if you disable RIP.

Removed RTA and IMPOSSIBLE tokens (unused).

Removed superfluous comment in filter.h.

I've tried to do my best, but Pavel, please check these changes.
---
 filter/config.Y    | 21 +++++++++++----------
 filter/f-util.c    |  9 +++++++++
 filter/filter.h    |  3 +--
 proto/rip/config.Y |  6 +++++-
 4 files changed, 26 insertions(+), 13 deletions(-)

diff --git a/filter/config.Y b/filter/config.Y
index 856189ec..ed94b9bf 100644
--- a/filter/config.Y
+++ b/filter/config.Y
@@ -34,16 +34,15 @@ CF_KEYWORDS(FUNCTION, PRINT, PRINTN, CONST, UNSET, RETURN,
 	INT, BOOL, IP, PREFIX, PAIR, SET, STRING,
 	IF, THEN, ELSE, CASE,
 	TRUE, FALSE,
-	RTA, FROM, GW, NET, MASK, RIP_METRIC, RIP_TAG, SOURCE,
+	FROM, GW, NET, MASK, SOURCE,
 	LEN,
 	DEFINED,
-	IMPOSSIBLE,
 	FILTER, WHERE)
 
 %nonassoc THEN
 %nonassoc ELSE
 
-%type <x> term block cmds cmd function_body constant print_one print_list var_list var_listn any_dynamic function_call
+%type <x> term block cmds cmd function_body constant print_one print_list var_list var_listn dynamic_attr function_call
 %type <f> filter filter_body where_filter
 %type <i> type break_command pair
 %type <e> set_item set_items switch_body
@@ -268,10 +267,12 @@ constant:
  | ENUM	  { $$ = f_new_inst(); $$->code = 'c'; $$->aux = $1 >> 16; $$->a2.i = $1 & 0xffff; }
  ;
 
-any_dynamic:
-   RIP_METRIC { $$ = f_new_inst(); $$->aux = T_INT; $$->a2.i = EA_RIP_METRIC;}
- | RIP_TAG    { $$ = f_new_inst(); $$->aux = T_INT; $$->a2.i = EA_RIP_TAG; }
- ;
+/*
+ *  Maybe there are no dynamic attributes defined by protocols.
+ *  For such cases, we force the dynamic_attr list to contain
+ *  at least an invalid token, so it's syntantically correct.
+ */
+CF_ADDTO(dynamic_attr, INVALID_TOKEN { $$ = NULL; })
 
 rtadot: /* EMPTY, we are not permitted RTA. prefix */
  ;
@@ -334,7 +335,7 @@ term:
  | rtadot NET     { $$ = f_new_inst(); $$->code = 'a'; $$->aux = T_PREFIX; $$->a2.i = 0x12345678; }
  | rtadot SOURCE  { $$ = f_new_inst(); $$->code = 'a'; $$->aux = T_ENUM_RTS; $$->a2.i = OFFSETOF(struct rta, gw); }
 
- | rtadot any_dynamic { $$ = $2; $$->code = P('e','a'); }
+ | rtadot dynamic_attr { $$ = $2; $$->code = P('e','a'); }
 
  | term '.' IP { $$ = f_new_inst(); $$->code = P('c','p'); $$->a1.p = $1; $$->aux = T_IP; }
  | term '.' LEN { $$ = f_new_inst(); $$->code = P('c','p'); $$->a1.p = $1; $$->aux = T_INT; }
@@ -416,12 +417,12 @@ cmd:
      $$->code = 'r';
      $$->a1.p = $2;
    }
- | rtadot any_dynamic '=' term ';' {
+ | rtadot dynamic_attr '=' term ';' {
      $$ = $2;
      $$->code  = P('e','S');
      $$->a1.p = $4;
    }
- | UNSET '(' rtadot any_dynamic ')' ';' {
+ | UNSET '(' rtadot dynamic_attr ')' ';' {
      $$ = $4;
      $$->aux = T_VOID;
      $$->code = P('e','S');
diff --git a/filter/f-util.c b/filter/f-util.c
index b070d951..2bc78737 100644
--- a/filter/f-util.c
+++ b/filter/f-util.c
@@ -32,6 +32,15 @@ f_new_inst(void)
   return ret;
 }
 
+struct f_inst *
+f_new_dynamic_attr(int code)
+{
+  struct f_inst *f = f_new_inst();
+  f->aux = T_INT;
+  f->a2.i = code;
+  return f;
+}
+
 char *
 filter_name(struct filter *filter)
 {
diff --git a/filter/filter.h b/filter/filter.h
index a08f1267..bbf30408 100644
--- a/filter/filter.h
+++ b/filter/filter.h
@@ -57,6 +57,7 @@ struct filter {
 
 void filters_postconfig(void);
 struct f_inst *f_new_inst(void);
+struct f_inst *f_new_dynamic_attr(int code);
 struct f_tree *f_new_tree(void);
 
 struct f_tree *build_tree(struct f_tree *);
@@ -121,6 +122,4 @@ struct f_tree {
 
 #define NEW_F_VAL struct f_val * val; val = cfg_alloc(sizeof(struct f_val));
 
-/* Create pair from two letters */
-
 #endif
diff --git a/proto/rip/config.Y b/proto/rip/config.Y
index 1bc67207..e1094a50 100644
--- a/proto/rip/config.Y
+++ b/proto/rip/config.Y
@@ -25,7 +25,8 @@ CF_DECLS
 CF_KEYWORDS(RIP, INFINITY, METRIC, PORT, PERIOD, GARBAGETIME, PASSWORDS,
 	    MODE, BROADCAST, QUIET, NOLISTEN, VERSION1, 
 	    AUTHENTICATION, NONE, PLAINTEXT, MD5,
-	    HONOUR, NEVER, NEIGHBOUR, ALWAYS)
+	    HONOUR, NEVER, NEIGHBOUR, ALWAYS,
+	    RIP_METRIC, RIP_TAG)
 
 %type <i> rip_mode rip_auth
 
@@ -97,6 +98,9 @@ rip_iface_list:
  | rip_iface_list ',' rip_iface
  ;
 
+CF_ADDTO(dynamic_attr, RIP_METRIC { $$ = f_new_dynamic_attr(EA_RIP_METRIC); })
+CF_ADDTO(dynamic_attr, RIP_TAG { $$ = f_new_dynamic_attr(EA_RIP_TAG); })
+
 CF_CODE
 
 CF_END