As if a linked list itself isn’t one of the most terrifying things in C, another beast exists: the double-linked list. It mixes structures and pointers and offers gross potential for extreme mayhem. That sounds like fun!
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The C language has its basic variable types: char, int, float, double, struct, and that oddball newbie _Bool. Anything else you see as a “variable” is probably a convenient shortcut manufactured by using a typedef statement. Some of these typedef variables are faily standard, including the most common one, size_t.
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It’s not unsafe to use putchar() as condition inside a while loop. If you dare try it, however, you must ensure that it checks for file errors. That’s an area where my own code often falls short.
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I confess that I get sloppy with getchar() and putchar(). These are macros, not functions, but the issue is that their return value is an int, not a char variable. The reason why is important if you want to follow safe coding practices.
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String constants and strings created or manipulated by C library functions all set that terminating null character, '\0'. When you build your own strings, however, it’s easy to completely forget that null character. I know. I’ve done it.
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As with the strcpy() function, covered in last week’s Lesson, you run a risk of buffer overflow with strcat(). The compiler doesn’t check for an overflow; to ensure that you’re practicing safe coding habits, that task is up to you.
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C offers a smattering of string-manipulation functions, but it leaves many of the critical issues up to you. Specifically, you must ensure that a string doesn’t overflow its buffer and that all strings are capped with the null character, '\0'.
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When it was pointed out to me that using the scanf() functions in my online teaching material was an “unsafe coding practice,” I thought, “Well, duh!” I’ve never been a fan of scanf(); it’s an ugly function.
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Recently, I was notified of some weak programming practices common in beginning C material. As someone who appreciates solid code, I was surprised to hear about these items. As a teacher, I’m quick to address them.
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With almost all the former-constants converted to variables, only one puzzle remains: Padding each string’s output so that the columns line up. (Yes, this is the final part of this series!)
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