A host program can execute Lua chunks written in a file or in a string,
using the following functions:
int lua_dofile (char *filename);
int lua_dostring (char *string);
Both functions return an error code:
0, in case of success; non zero, in case of errors.
The function lua_dofile
, if called with argument NULL (0),
executes the ``file'' stdin.
is also able to execute pre-compiled chunks.
It detects whether the file is text or not,
and loads it accordingly (see program luac).