docs: tweak keep_data_small.txt

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/docs/keep_data_small.txt b/docs/keep_data_small.txt
index 9fc799646a3ad44a3fcf011d2662a377746c4463..3ced1a61da0dbdbab1f68abec7fad6d982adb1a2 100644 (file)
--- a/docs/keep_data_small.txt
+++ b/docs/keep_data_small.txt
@@ -103,7 +103,15 @@ smaller code. In order to assign it, use SET_PTR_TO_GLOBALS macro:
 
        SET_PTR_TO_GLOBALS(xzalloc(sizeof(G)));
 
-Typically it is done in <applet>_main().
+Typically it is done in <applet>_main(). Another variation is
+to use stack:
+
+int <applet>_main(...)
+{
+#undef G
+       struct globals G;
+       memset(&G, 0, sizeof(G));
+       SET_PTR_TO_GLOBALS(&G);
 
 Now you can reference "globals" by G.a, G.buf and so on, in any function.