From 4163c691dfb2e1b681a2036c49c0663cae1d7f59 Mon Sep 17 00:00:00 2001
From: tgoodwin <tgoodwin>
Date: Wed, 8 Jul 1998 17:00:32 +0000
Subject: completely revamp to use my `+' example

---
 addon.c | 26 ++++++++++----------------
 addon.h | 46 ++++++++++++++++++----------------------------
 2 files changed, 28 insertions(+), 44 deletions(-)

diff --git a/addon.c b/addon.c
index df3fcd7..b6ddc61 100644
--- a/addon.c
+++ b/addon.c
@@ -1,22 +1,16 @@
 /*
-   This file contains the implementations of any locally defined
-   builtins.
+   This file is NOT BUILT by default.  Together with addon.h, it
+   provides an example of how to add new builtins to rc.
 */
 
-#ifdef	DWS
-
-/*
-   This is what DaviD Sanderson (dws@cs.wisc.edu) uses.
-*/
-
-#include <sys/types.h>
-#include <sys/file.h>
-#include <sys/stat.h>
-
-#include "rc.h"		/* for bool TRUE, FALSE */
+#include "rc.h"
 #include "addon.h"
 
-#include "addon/access.c"
-#include "addon/test.c"
+void b_add(char **av) {
+	long sum = 0;
 
-#endif
+	while (*++av)
+		sum += atol(*av);
+	fprint(1, "%ld\n", sum);
+	set(TRUE);
+}
diff --git a/addon.h b/addon.h
index 25f2312..b4a207b 100644
--- a/addon.h
+++ b/addon.h
@@ -1,38 +1,28 @@
 /*
-   This file is the interface to the rest of rc for any locally
-   defined addon builtins.  By default there are none.
-   The interface consists of the following macro.
-  
-   ADDONS	A comma-separated list of pairs of function pointers
-		and string literals.
-  
-   The addon functions must also have proper prototypes in this file.
-   The builtins all have the form:
-  
+   This file is NOT BUILT by default.  Together with addon.c, it
+   provides an example of how to add new builtins to rc.
+
+   To define a new builtin, it must appear in the macro ADDONS, which
+   is a comma-separated list of pairs of function pointers (the
+   implementation of the new builtin) and string literals (the name of
+   the new builtin).
+
+   Any new builtin functions must also have proper prototypes in this
+   file.  This is always of the same form.
+
 	void b_NAME(char **av);
-  
+
+   The first argument, av[0], is the name of the builtin.  The last
+   argument is followed by a NULL pointer.
+
    Builtins report their exit status using set(TRUE) or set(FALSE).
   
-   Example:
-  
-	#define ADDONS	{ b_test, "test" },
-	extern void b_test(char **av);
 */
 
-#define ADDONS		/* no addons by default */
-
-#ifdef	DWS
-
-/*
-   This is what DaviD Sanderson (dws@cs.wisc.edu) uses.
-*/
+#if RC_ADDON
 
-#undef	ADDONS
-#define ADDONS	{ b_access,	"access" },\
-		{ b_test, 	"test" },\
-		{ b_test,	"[" },
+#define ADDONS	{ b_add,	"+" },
 
-extern void b_access(char **av);
-extern void b_test(char **av);
+extern void b_add(char **av);
 
 #endif
-- 
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