X-Git-Url: https://git.distorted.org.uk/~mdw/secnet/blobdiff_plain/ae5ae3bf5c5709938e3a2bb6203094ede8af45e6..84dcd42dbf0f412cb0daffc44ceb9c2baf25657e:/util.h

diff --git a/util.h b/util.h
index 63ceef6..de1aaa5 100644
--- a/util.h
+++ b/util.h
@@ -89,6 +89,21 @@ void string_item_to_iaddr(const item_t *item, uint16_t port, union iaddr *ia,
 			  const char *desc);
 
 
+/*
+ * 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 -----*/
 
 enum async_linebuf_result {