Doubly Linked Lists and the Abstract Data Type
This last group has only one function in that it returns version information, so a program can determine if it is linking to a different version and check for any incompatibilities.
The short answer is it is used for just about any type of data storage where you don't know how much data is to be stored. One example that I've been working with is 3D graphics data where there could be an unknown number of objects in a scene. I've written bar code scanning software that uses this DLL to keep track of all the hand-held terminals that are in use. I also worked on a database conversion program that reads data into one linked list, allowing you to edit it; it then converts the data to another linked list and writes it out again.
I'll mainly concentrate on compiling the Linux version; however, there are two Makefiles for DOS: one that compiles using the DJGPP GNU compiler and the other for the MS6.0 compiler. All three Makefiles are included in the distribution. If anyone is interested, there is also a slightly modified version of the DLL that compiles on Big Blues 4690 OS (FlexOS) using the Metaware C compiler (this OS is used in point-of-sale systems).
First, we need to use tar to extract the files into the directory where you want it to reside.
tar -xvzf linklist.1.0.0.tar.gz -C /your/path
The tar file will create a directory named linklist and put everything in it. Next, use cd to move to the linklist directory and type one of the following, assuming you're using the GNU compiler:
makecreates a shared library, or
make staticcreates a static library.
To install the library in the /usr/local/lib directory, enter either make install or make install-static.
That's all there is to it. You're now ready to write some code.
The concept of the ADT is at the core of object-oriented programming and, as mentioned previously, central to cross- platform development. My linked list example should be of use as either a practical or a learning tool.
Carl J. Nobile currently writes point of sale software and is the administrator of an AIX Unix system for Genovese Drug Stores in New York. At home he is working on a program that can be used to design geodesic homes using ideas from Buckminster Fuller's Synergetics. He can be reached electronically at firstname.lastname@example.org.
Fast/Flexible Linux OS Recovery
On Demand Now
In this live one-hour webinar, learn how to enhance your existing backup strategies for complete disaster recovery preparedness using Storix System Backup Administrator (SBAdmin), a highly flexible full-system recovery solution for UNIX and Linux systems.
Join Linux Journal's Shawn Powers and David Huffman, President/CEO, Storix, Inc.
Free to Linux Journal readers.Register Now!
- Ubuntu Online Summit
- Devuan Beta Release
- The Qt Company's Qt Start-Up
- Download "Linux Management with Red Hat Satellite: Measuring Business Impact and ROI"
- May 2016 Issue of Linux Journal
- The US Government and Open-Source Software
- Open-Source Project Secretly Funded by CIA
- The Death of RoboVM
- New Container Image Standard Promises More Portable Apps
- BitTorrent Inc.'s Sync
In modern computer systems, privacy and security are mandatory. However, connections from the outside over public networks automatically imply risks. One easily available solution to avoid eavesdroppers’ attempts is SSH. But, its wide adoption during the past 21 years has made it a target for attackers, so hardening your system properly is a must.
Additionally, in highly regulated markets, you must comply with specific operational requirements, proving that you conform to standards and even that you have included new mandatory authentication methods, such as two-factor authentication. In this ebook, I discuss SSH and how to configure and manage it to guarantee that your network is safe, your data is secure and that you comply with relevant regulations.Get the Guide