valid_char_count  122 src/dps8/utfile.c   long valid_char_count = (long) strlen(valid_file_name_chars);
valid_char_count  124 src/dps8/utfile.c   if (valid_char_count < 1)
valid_char_count  135 src/dps8/utfile.c         = valid_file_name_chars[random() % valid_char_count];