rem: char buf[257]; char *rc;
add: char buffer[SYS_MAX_PATH_LEN];
context: int cmd_pwd(int argc, char *argv[]){	char buf[257];	char *rc;	rc = sys_getcwd(buf,256);	if (rc != NULL) {		printf("cd: sys_getcwd() returned error!\n");	}	buf[256] = 0;	printf("%s\n", buf);	return 0;}