Re: loadlib

[Luiz Henrique de Figueiredo <lhf@...>]

>Do we have a convention for naming the init() function with loadlib()?
>
>e.g. fnc=loadlib(mylib,initfunction)
>
>whats a good name for 'initfunction' ?

The convention used in the standard Lua libraries is "luaopen_xxx" where
"xxx" identifies the library, that is, is the name of the table it exports.

Here is a few names of the libraries I'm working on now (my own projects,
not official Lua libraries):

 alarm/lalarm.c  LUALIB_API int luaopen_alarm (lua_State *L)
 bc/lbc.c        LUALIB_API int luaopen_bc (lua_State *L)
 gdbm/lgdbm.c    LUALIB_API int luaopen_gdbm (lua_State *L)
 mapm/lmapm.c    LUALIB_API int luaopen_mapm (lua_State *L)
 pdf/lpdf.c      LUALIB_API int luaopen_pdf (lua_State *L)
 posix/lposix.c  LUALIB_API int luaopen_posix (lua_State *L)

Note that the library is named lxxx.so. Moreover, I'm using a xxx.lua
file that loads the .so and adds support code if necessary. This reads
nicely with -l in the standalone interpreter. Here is a sample:

 -- bc.lua
 -- support code for bc library
 -- usage lua -lbc ...

 local function so(x)
	 local SOPATH= os.getenv"LUA_SOPATH" or "./"
	 assert(loadlib(SOPATH.."l"..x..".so","luaopen_"..x))()
 end

 so"bc"
 do
  local T=bc.metatable
  T.__add=bc.add
  T.__sub=bc.sub
  T.__mul=bc.mul
  T.__div=bc.div
  T.__pow=bc.pow
  T.__lt=function (a,b) return bc.compare(a,b)<0 end
  T.__eq=function (a,b) return bc.compare(a,b)==0 end
  T.__unm=function (a) return bc.sub(0,a) end
  T.__tostring=bc.tostring
 end

--lhf