hawkeye (hawkeye7) wrote,
hawkeye
hawkeye7

A rant on C

Back in "O week" when I was an undergraduate, the head of the Science Faculty announced a competition for the best essay on the topic of "What I would like to achieve in science". One of the entrants was a guy in my CompSci class called Zoltan. Now, I don't know if his essay won the competition but the odds weren't too bad at all as only three entries were eventually received. What Zoltan wanted to do was design a new computer language. One part of his essay sticks in my mind. He recognised that dreaming up a new language from scratch was an awesome task and proposed to base his new language on an existing one. "I chose C" he wrote.

Now for those of you more familiar with natural languages like English and Russian, the idea of creating a new language and getting people to accept it may appear preposterous. But new computer languages are being created all the time - although not as often as they once were - and new languages like Java (1994) and C# (2001) can achieve widespread acceptance very quickly. Computer languages are functional, designed to be understandable both by humans and machines.

At the time - we going back a long time here - C was a relatively new language, having been developed back in the 1970s and defined through its bible, The C Programming language by Brian Kernighan and Dennis Ritchie, which was published in 1978. In the 1980s, C migrated from the minicomputers to the desktops. As undergraduates we found C inviting as it combined power with speed and flexibility. In short, C was the hot rod of computer languages.

There are good reasons why we use C at work. To quote Bjarne Stroustrup:

  • C is flexible... The language has no inherent limitations that preclude particular programs from being written. [Although there are still certain things that must be written in assembler]
  • C is efficient... it is relatively easy for a compiler and/or programmer to efficiently utilise hardware resources for C programs
  • C is available... Given a computer, whether the tiniest micro or the largest super-computer, chances are that there is an acceptable quality C compiler available... [Chances are that every program running on your puter is written predominately or entirely in C.]
  • C is portable... A C program is not automatically portable from one machine to another nor is a port easy to do. It is, however, usually posible...

The business model of the company I work for is based on this. Sure, you could write write your own software that does the same job as our product - but that would cost money, both to write it and to maintain it; more money than our product costs. We don't need to develop anything, because it's already written, and we spread the maintenance load over many customers. The trick is to make the same software available on many platforms for many customers. Therefore, we do lots of ports - perhaps one or two every week.

Yet a lot of the effort and a considerable number of the problems plaguing the industry as a whole can also be tracked back to C. Due to its low-level nature, C has this tendency for even the simplest of programs to crash or run amok. Many of the computer security problems that you hear about are based on exploiting bugs of this nature. Trying to fix them is a constant challenge. Trying to avoid them has been no less difficult. It seems like the effort is making us rewrite large chunks of the standard library. The ease with which the language permits certain stupid mistakes forces us to write in a rigid style that has been found to avoid as many as possible.

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