X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=secnet.git;a=blobdiff_plain;f=util.h;h=de1aaa51b8fd99ed0ecc8afbcc32b1ed5eae95ea;hp=d4663dbf6c98a65de699c23312e926c8d42e335c;hb=5e7a63be9a512bf979e5538e6a694d5fd66b9380;hpb=5f37eb107bd4370ee0ed1c1c185abb06ee873ac2

diff --git a/util.h b/util.h
index d4663db..de1aaa5 100644
--- a/util.h
+++ b/util.h
@@ -89,7 +89,20 @@ void string_item_to_iaddr(const item_t *item, uint16_t port, union iaddr *ia,
 			  const char *desc);
 
 
-#define SBUF (bufs[b]) /* temporary macro */
+/*
+ * SBUF_DEFINE(int nbufs, size_t size);
+ *   // Generates a number of definitions and statements organising
+ *   // nbufs rotating char[size] buffers such that subsequent code
+ *   // may refer to:
+ * char *const SBUF;
+ */
+#define SBUF_DEFINE(nbufs, size)			\
+    static int static_bufs__bufnum;			\
+    static char static_bufs__bufs[(nbufs)][(size)];	\
+    static_bufs__bufnum++;				\
+    static_bufs__bufnum %= (nbufs);			\
+    static_bufs__bufs[static_bufs__bufnum]
+#define SBUF (static_bufs__bufs[static_bufs__bufnum])
 
 /*----- line-buffered asynch input -----*/