char **
parse_command(char *input) {
	static char com[COM_BUF_SIZE];
	memcpy(com, input, COM_BUF_SIZE);
	static char *starts[128];
	memset(starts, 0, sizeof(starts));
	int next_start = 0;
	com[COM_BUF_SIZE - 1] = ' ';
	for (int i = 0; i < COM_BUF_SIZE; i++) {
		for (; com[i] == ' ' && i < COM_BUF_SIZE; i++);
		if (i >= COM_BUF_SIZE) break;
		starts[next_start] = com + i;
		for(; i < COM_BUF_SIZE && com[i] != ' '; i++)
			;
		com[i] = '\0';
		next_start++;
	}
	return &starts[0];
}

void
run_command(char *c) {
	char **com = parse_command(c);
	if(com[0] == NULL) return;
	if(commands[com[0][0]] != NULL)
		commands[com[0][0]](c, com);
	else
		puts("invalid command");
}

int
main(int argc, char **argv) {
	static char buf[COM_BUF_SIZE];

	if (argc >= 2) {
		load_file(argv[1]);
	}

	while(1) {
                memset(buf, 0, sizeof(buf));
		printf("   > ");
		fflush(stdout);
		char *com = fgets(buf, sizeof(buf), stdin);
                for (int i = 0; i < sizeof(buf); i++)
                        if (buf[i] == '\n')    
                                buf[i] = '\0';
		if (com != NULL) {
			run_command(com);
		}
	}
	return 0;
}