Re: Stack Overflow if Library is named taboo.so

[Paul K <paulclinger@...>]

Hi Chris,

> If I change the library name to literally anything else, it works fine. I'm fairly new to lua, so I may be missing something. But I can't think of any reason why this should be happening. Have I found some obscure bug, or am I on crack?

You named your file taboo.lua and are trying to load a module with the
same name. "require" loads the same file, it gets executed, hits
"require", it loads the same file and so on until you hit recursion
limit.

Rename your script to something else.

Paul.

On Thu, May 30, 2013 at 8:54 PM, Chris Tetreault
<forums@doingmyprogramming.com> wrote:
> I had such a strange issue, I felt compelled to share. I'm working on a
> simple lua C library for a blog entry I'm working on, and apparently you
> can't name a lua C library "taboo". The following is my library code:
>
> #ifndef TABOO_H
> #define    TABOO_H
>
> #ifdef    __cplusplus
> extern "C" {
> #endif
>
> #include <lua.h>
> #include <lualib.h>
> #include <lauxlib.h>
>
>     static int test_string(lua_State * L);
>     int luaopen_taboo(lua_State * L);
>
>
> #ifdef    __cplusplus
> }
> #endif
>
>  -----------------------------------------------------
>
> #include <string.h>
> #include "taboo.h"
>
> static int test_string(lua_State * L){
>     const char * test_val = lua_tostring(L, -1);
>     if (strcmp("foo", test_val) || strcmp("bar", test_val)){
>         lua_pushboolean(L, 1);
>         return 1;
>     }
>     else{
>         lua_pushboolean(L, 0);
>         return 1;
>     }
>     return 0;
> }
>
>
> static const struct luaL_Reg test [] = {
>     {"test_string", test_string},
>     {NULL, NULL}
> };
>
> int luaopen_taboo(lua_State * L){
>     luaL_newlib(L, test);
>     lua_setglobal(L, "test");
>     return 0;
> }
>
> ... installed like so ...
>
> sudo mv NetBeansProjects/taboo/dist/Debug/GNU-Linux-x86/libtaboo.so
> /usr/local/lib/lua/5.2/abcde.so
>
> ... and my script ...
>
> #!/home/chris/lua/bin/lua
>
> require("taboo")
>
> print(test.test_string("foo"))
> print(test.test_string("words"))
>
> ... when run, outputs ...
>
> ./taboo.lua
> /home/chris/lua/bin/lua: error loading module 'taboo' from file
> './taboo.lua':
>     ./taboo.lua:5: too many C levels (limit is 200) in main function near
> '"foo"'
> stack traceback:
>     [C]: in ?
>     [C]: in function 'require'
>     ./taboo.lua:3: in main chunk
>     [C]: in function 'require'
>     ./taboo.lua:3: in main chunk
>     [C]: in function 'require'
>     ./taboo.lua:3: in main chunk
>     [C]: in function 'require'
>     ./taboo.lua:3: in main chunk
>     [C]: in function 'require'
>     ...
>     [C]: in function 'require'
>     ./taboo.lua:3: in main chunk
>     [C]: in function 'require'
>     ./taboo.lua:3: in main chunk
>     [C]: in function 'require'
>     ./taboo.lua:3: in main chunk
>     [C]: in function 'require'
>     ./taboo.lua:3: in main chunk
>     [C]: in function 'require'
>     ./taboo.lua:3: in main chunk
>     [C]: in ?
>
> If I change the library name to literally anything else, it works fine. I'm
> fairly new to lua, so I may be missing something. But I can't think of any
> reason why this should be happening. Have I found some obscure bug, or am I
> on crack?