The game Hunt the Wumpus isn’t difficult to code in C. In fact, all you need do is start with the basic number-guessing game presented in last week’s Lesson and you can build just about any text-mode game. That’s what I did when I started my own C language version of Hunt the Wumpus.
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I was perusing Rosetta Code the other day, looking for more programming ideas to explore. One of the tasks provided, with examples in a variety of programming languages, was to code the old computer game Hunt the Wumpus.
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If you desire to store formatted output in a buffer, the snprintf() function, covered in last week’s Lesson, is a safe alternative to the standard Library sprintf() function. An even better choice is the asprintf() function.
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The problem with snipping blank lines from the end of a file is storing the file as it’s processed. At least that’s the issue I faced as I worked through my solution to this month’s Exercise.
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Another non-standard library function is snprintf(). Like the strlcpy() and strlcat() functions shown in previous Lessons, snprintf() is safer than its standard Library counterpart, sprintf().
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Recently, I wrote a utility that required the final line of text in a file to terminate with a special code. The code had to sit at the end of a line of text, not on a blank line. What I discovered is that many text files end with one or more blank lines.
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Coding my own version of the non-standard strlcat() function proved to be a bit more work than I anticipated. That’s because I also had to code my own versions of the strcpy() and strlen() functions to make the thing work.
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The strlcat() function (with the L) achieves the same goal as the venerable strcat() function: to append one string onto the end of the other. The problem with strcat(), however, is that a size limitation isn’t set for the destination buffer. It’s quite possible for this buffer to overflow.
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Armed with information about how the non-standard strlcpy() function is implemented by my compiler (see last week’s Lesson), and fully testing its input and output, I was better able to craft my own version. Granted, it’s not the way I would have coded things on my own, but the point is to recreate the function exactly so it can be used as a substitute.
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A Morse Code filter probably has no practical use, but it’s a good programming exercise. The issue is how to deal with undefined character codes and otherwise present the output. My solution for this month’s Exercise involves interpreting standard input, discarding undefined information, and sending the results to standard output in a format that isn’t ugly.
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