[metapost] Recovering from errors in MPlib

[Nicola]

Hi,
when using MPlib, is it possible to recover from errors?

In other words, when the current status of the MP instance is
mp_error_message_issued, is it possible to return to a status
where commands are accepted again? If so, how?

I ask, because whatever command I send after an error,
the status doesn't change. Maybe I'm doing something wrong.

This is the function I'm using:

void eval(MP mp) {
   int history = mp_execute(mp, line_read, strlen(line_read));
   mp_run_data *result = mp_rundata(mp); // TODO: I guess I must free this
   printf("%s\n", result->term_out.data);
   printf("DEBUG: mp_status = %d\n", mp_status(mp));
   switch (history) {
     case mp_spotless:
       printf("OK\n");
       break;
     case mp_warning_issued:
       printf("Warning\n");
       break;
     case mp_error_message_issued:
       printf("Error\n");
       break;
     case mp_fatal_error_stop:
       printf("Fatal error\n");
       break;
     case mp_system_error_stop:
       printf("System error\n");
       break;
     default:
       printf("Default\n");
   }
}

Nicola