docs: tweak keep_data_small.txt
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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@ -103,7 +103,15 @@ smaller code. In order to assign it, use SET_PTR_TO_GLOBALS macro:
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SET_PTR_TO_GLOBALS(xzalloc(sizeof(G)));
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Typically it is done in <applet>_main().
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Typically it is done in <applet>_main(). Another variation is
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to use stack:
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int <applet>_main(...)
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{
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#undef G
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struct globals G;
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memset(&G, 0, sizeof(G));
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SET_PTR_TO_GLOBALS(&G);
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Now you can reference "globals" by G.a, G.buf and so on, in any function.
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