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19.3. Interpreting Commands from a File

For all practical purposes, any interpreter is pretty useless if it works only interactively. I have added a 'source' built-in command to 'sic_builtin.c', which takes lines of input from a file and evaluates them using 'sic_repl.c' in much the same way as lines typed at the prompt are evaluated otherwise. Here is the built-in handler:

/* List of built in functions. */
#define builtin_functions               \
        BUILTIN(exit,           0, 1)   \
        BUILTIN(load,           1, 1)   \
        BUILTIN(source,         1, -1)  \
        BUILTIN(unload,         1, -1)

BUILTIN_DECLARATION (source)
{
  int status = SIC_OKAY;
  int i;

  for (i = 1; status == SIC_OKAY && argv[i]; ++i)
    status = source (sic, argv[i]);

  return status;
}

And the 'source' function from 'sic_repl.c':

 int source (Sic ...