s = argv[i++]; if (1 != sscanf (s, " %d %c", &to_x, &dummy)) usage();
s = argv[i++]; if (1 != sscanf (s, " %d %c", &to_y, &dummy)) usage();
s = argv[i++]; if (1 != sscanf (s, " %d %c", &w, &dummy)) usage();
s = argv[i++]; if (1 != sscanf (s, " %d %c", &to_x, &dummy)) usage();
s = argv[i++]; if (1 != sscanf (s, " %d %c", &to_y, &dummy)) usage();
s = argv[i++]; if (1 != sscanf (s, " %d %c", &w, &dummy)) usage();