Help writing my first Lua C module
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- Subject: Help writing my first Lua C module
- From: David Crayford <dcrayford@...>
- Date: 2013年9月27日 20:50:31 +0800
This is my first foray into writing my first Lua C module. I've patched
lots of them for my z/OS port and have a reasonable understanding of the API
but I'm looking for best practice.
On z/OS the UI is called ISPF and everybody uses it. In recent years
there have been Eclipse GUIs for most of the products but nobody uses them.
ISPF is very simple and uses an arcane panel markup language backed by a
services API
http://pic.dhe.ibm.com/infocenter/zos/v1r11/index.jsp?topic=/com.ibm.zos.r11.f54sg00/ispzsg80.htm.
The ISPF services APIs are function pointers which are dynamically
loaded similar to a shared object.
// ISPF API functions.
typedef int (isplink_t)();
typedef int (ispexec_t)( size_t, const char * );
struct ISPF_services
{
isplink_t * isplink;
ispexec_t * ispexec;
} api;
// load ISPLINK/ISPEXEC services
api.isplink = ( isplink_t * ) fetch("ISPLINK");
api.ispexec = ( ispexec_t * ) fetch("ISPEXEC");
Is it better to return the API as userdata or create a table? I'm a
neophyte so bear with me.
I want to be able to do something like this
ispf = require("ispf")
while ispf:exec("DISPLAY PANEL(P)") == 0 do
-- process the panel
end