Many moons ago, I wrote about the non-standard function, strcasecmp(). It works like the C library function strcmp(), though it ignores character case. Turns out my return value from the function isn’t exactly correct.
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The 16-hour puzzle presented in last week’s Lesson has been resolved: It was actually a 24-hour puzzle, minus 8 hours for my time zone, which equals 16 hours. But what can be done about the time zone difference?
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In last week’s Lesson, I covered the mechanics behind manually calculating a time_t value. My code was successful, but in a curious way.
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Ho boy! This time_t project turned out to be a lot more complex than I thought it would be!
The problem: Count the number of seconds elapsed from January 1, 1970 to a given year, month, and day. This task is easy for a computer, but not that easy to code if you want to get the value correct.
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Pulling a date from a string involves slicing the string into substrings, which are then converted into values for year, month, and day. Last week’s Lesson demonstrated such code. This week, the final step is accomplished, converting year, month, and day integers into a time_t value.
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The goal stated in last week’s Lesson is to convert a date formatted in a filename string into a time_t value. The filename string must be scanned for expected year, month, and date values. This process involves a custom function, convert(), as well as the strtol() function to translate strings of digits into long int values.
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A recent puzzle presented itself, one where I must extract a date based on a file’s name. The date is part of the name, but my code required I translate the date into a time_t value. It’s an awesome programming puzzle that involves many different tricks.
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The results of the 27th International Obfuscated C Code Contest were announced earlier this month. The code is amazing. It runs. It’s horrifyingly cryptic.
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Like all IDEs, Code::Blocks is effectively a front for the clang, minGW, or gcc compiler lurking somewhere under its skin. While you don’t use these command line tools directly, you can control their options and settings from within the IDE.
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The traditional C compiler is cc. Its GNU replacement in the Linux world is gcc. A better option is the LLVM clang compiler. As commands typed at a prompt, you control these compilers by setting command line options or switches.
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