Todor Totev wrote:I'd like to use (platform specific) fseek with 64-bit file offsets inside io lib f_seek function.But it gets the lua number with luaL_optlong which truncates it to long. What do you suggest me to fix it?Either patch Lua with your platform-specific fseek, or write a library.Use luaL_optnumber rather than luaL_optlong, cast it to whatever is a 64-bit integer type on your platform, then you'll be able to get/set offsets up to 2^53 bytes (assuming lua_Number is double).
luaL_optnumber is what I need, thank you very much.