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CLuaModuleExample/src/custommath.c at master · Seng3694/CLuaModuleExample · GitHub
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custommath.c
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#include
"custommath.h"
int
add
(
lua_State
*
lua
)
{
if
(
lua_isnumber
(
lua
,
-1
)
&&
lua_isnumber
(
lua
,
-2
))
{
LUA_NUMBER
b
=
lua_tonumber
(
lua
,
-1
);
lua_pop
(
lua
,
1
);
LUA_NUMBER
a
=
lua_tonumber
(
lua
,
-1
);
lua_pop
(
lua
,
1
);
lua_pushnumber
(
lua
,
a
+
b
);
return
1
;
}
return
0
;
}
int
subtract
(
lua_State
*
lua
)
{
if
(
lua_isnumber
(
lua
,
-1
)
&&
lua_isnumber
(
lua
,
-2
))
{
LUA_NUMBER
b
=
lua_tonumber
(
lua
,
-1
);
lua_pop
(
lua
,
1
);
LUA_NUMBER
a
=
lua_tonumber
(
lua
,
-1
);
lua_pop
(
lua
,
1
);
lua_pushnumber
(
lua
,
a
-
b
);
return
1
;
}
return
0
;
}
int
multiply
(
lua_State
*
lua
)
{
if
(
lua_isnumber
(
lua
,
-1
)
&&
lua_isnumber
(
lua
,
-2
))
{
LUA_NUMBER
b
=
lua_tonumber
(
lua
,
-1
);
lua_pop
(
lua
,
1
);
LUA_NUMBER
a
=
lua_tonumber
(
lua
,
-1
);
lua_pop
(
lua
,
1
);
lua_pushnumber
(
lua
,
a
*
b
);
return
1
;
}
return
0
;
}
int
divide
(
lua_State
*
lua
)
{
if
(
lua_isnumber
(
lua
,
-1
)
&&
lua_isnumber
(
lua
,
-2
))
{
LUA_NUMBER
b
=
lua_tonumber
(
lua
,
-1
);
lua_pop
(
lua
,
1
);
LUA_NUMBER
a
=
lua_tonumber
(
lua
,
-1
);
lua_pop
(
lua
,
1
);
if
(
b
==
0
)
lua_pushnumber
(
lua
, (
LUA_NUMBER
)
NAN
);
else
lua_pushnumber
(
lua
,
a
/
b
);
return
1
;
}
return
0
;
}
int
luaopen_custommath
(
lua_State
*
lua
)
{
lua_createtable
(
lua
,
0
,
4
);
lua_pushstring
(
lua
,
"add"
);
lua_pushcfunction
(
lua
,
&
add
);
lua_settable
(
lua
,
-3
);
lua_pushstring
(
lua
,
"subtract"
);
lua_pushcfunction
(
lua
,
&
subtract
);
lua_settable
(
lua
,
-3
);
lua_pushstring
(
lua
,
"multiply"
);
lua_pushcfunction
(
lua
,
&
multiply
);
lua_settable
(
lua
,
-3
);
lua_pushstring
(
lua
,
"divide"
);
lua_pushcfunction
(
lua
,
&
divide
);
lua_settable
(
lua
,
-3
);
return
1
;
}
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