Begin forwarded message:
On Feb 18, 2018, at 5:06 PM, Andrew Gierth <andrew@tao11.riddles.org.uk> wrote:"Albert" == Albert Chan <albertmcchan@yahoo.com> writes:
Albert> I have trouble using Lua C stack, even in C
Albert> Say, I have a c function A that uses lua stack, that call
Albert> another c function B that also uses c lua stack. however, B did
Albert> a lua_settop of 1, then return 1.
If A calls B _as a C function_, then B should not be using settop or
making assumptions about the start of the lua stack.
If you want B to be able to use the stack freely without affecting the
caller, then you just call it with lua_pushcfunction and lua_call rather
than directly.
--
Andrew.
confession time: i wrote B :-(At the time, I HAD to "clean" the stack and return 1(i were not sure which side the 1 referred ... stack 1 ? stack -1 ?)Now, I know return 1 will be enough (if result is at top of stack)B function work perfectly, however, when call from lua.I only noticed the bug when it were called from A, another c-function.
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