From d06a875b042b608e61b2d5a2bb594641d3e1322f Mon Sep 17 00:00:00 2001
From: "Ondrej Zajicek (work)" <santiago@crfreenet.org>
Date: Sun, 7 Feb 2021 19:21:42 +0100
Subject: Filter: Recursive filter iteration code

Add macros for recursive filter iteration that allows to examine
all instructions reachable from a filter.
---
 lib/buffer.h | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'lib')

diff --git a/lib/buffer.h b/lib/buffer.h
index cd9bab86..fd40baa0 100644
--- a/lib/buffer.h
+++ b/lib/buffer.h
@@ -50,6 +50,8 @@
 
 #define BUFFER_FLUSH(v)		({ (v).used = 0; })
 
+#define BUFFER_EMPTY(v)		({ (v).used == 0; })
+
 #define BUFFER_WALK(v,n)						\
   for (BUFFER_TYPE(v) *_n = (v).data, n; _n < ((v).data + (v).used) && (n = *_n, 1); _n++)
 
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