rem: sprintf(errormsg,
add: snprintf(errormsg,sizeof(errormsg),
context: static void kcalerror(char *msg){  fprintf(stderr, "%s: %s in line %d of %s\n", progname,	  msg, kcallineno+1, filename);  if (!*errormsg)    sprintf(errormsg,	    "Problem with holiday file %s:\n%.80s in line %d",	    filename, msg, kcallineno+1);}