pose              110 lib/lua/lstrlib.c   ptrdiff_t pose = posrelat(luaL_optinteger(L, 3, posi), l);
pose              113 lib/lua/lstrlib.c   if ((size_t)pose > l) pose = l;
pose              114 lib/lua/lstrlib.c   if (posi > pose) return 0;  /* empty interval; return no values */
pose              115 lib/lua/lstrlib.c   n = (int)(pose -  posi + 1);
pose              116 lib/lua/lstrlib.c   if (posi + n <= pose)  /* overflow? */