Re: reading script from file: luaL_dofile inconsistencies
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- Subject: Re: reading script from file: luaL_dofile inconsistencies
- From: Andrew Gierth <andrew@...>
- Date: 2020年5月11日 17:36:19 +0100
>>>>> "Massimo" == Massimo Sala <massimo.sala.71@gmail.com> writes:
[luaL_dofile]
Massimo> 1) return code
Massimo> The manual says " It returns false if there are no errors or
Massimo> true in case of errors."
That's "false" and "true" in the C sense, where 0 is false and anything
that's not 0 is true.
i.e. the simplest usage is just
if (luaL_dofile(L, fn))
{
/* failed; do something with the error message that's at the top of
the Lua stack */
}
You can check the return value against the LUA_ERR* constants if the
code needs to distinguish between file, syntax and runtime errors.
Massimo> So it seems to me the return values can - at least - be 0, 1,
Massimo> 7. Am I right ?
It can be any of the error values.
Massimo> 2) loading compiled files
Massimo> luaL_dofile can load plain source code and compiled scripts
Massimo> (bytecode).
Massimo> I have to check users don't pass filenames of compiled
Massimo> scripts.
Then don't use luaL_dofile, instead use luaL_loadfilex, which has a
"mode" parameter. Do _NOT_ attempt to assume that you know what a
compiled file looks like.
--
Andrew.
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