Just Enough C For Open Source Projects

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+ guestf100 8 months ago
guest99d57: In C nothing is DWIM, in the sense that you can't declare your intent as much as you have to spell it out very explicitly. For example the simple task of accessing an array element. It won't for example check bounds to make sure you are getting an element (What you mean) it will access what ever is at that offset from the beginning of the array (What you said)!
+ guest4edc3a 8 months ago
slide 16: signed integer overflow is undefined and should never be used in real code. It happens to work on most implementations but C allows any result including a program crash.
+ guestd31d 8 months ago
slide 84: backslash-ampersand? In C?

also, strncat and strncpy would be better intoductory string copying functions.
+ guest88a6 8 months ago
Slide 13: static variables are initialized to 0.
+ guest0ca3 8 months ago
Please check the brackets in slide 8
+ guest99d57 8 months ago
Nothing is DWIM? I think in C everything is DWIM.
+ guestf09d 9 months ago
guestd766, it looks like you're right. When I compile slide 29 with 'char *p = &buffer'), I get this error: 'initialization from incompatible pointer type'. But when I change it to 'char *p = buffer') it compiles cleanly. (I also wrap the whole thing in a main() function similar to his first 'hello world' example on slide 8, to make the code work, too.) This is on Mac OS X (Tiger) with gcc 4.0.1
+ guest125c7 9 months ago
Slide 74, I think it should be double-quotes instead.

char name[] = 'Bob';
+ guestd766 9 months ago
On Slide 29, is that not supposed to be 'char *p = buffer;'? instead of 'char *p = &buffer;'? Or do I vaguely remember that &a and a refer to the same when a is of array type (i.e. a, &a and &a[0] all are one and same)? ...
+ sgwong 10 months ago
Thanks for the sharing. It is really a good introduction to c. I learn c in my college but almost forgot all the stuff because long time didn't use it. Thanks a lot!

Notes on slide 1

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Just Enough C For Open Source Projects - Presentation Transcript

Just Enough C For Open Source Projects Andy Lester OSCON 2008
Why this session?
It's all for Michael Schwern Schwern is a brilliant programmer. An invaluable asset to the Perl community. He still doesn't know C, even though Perl is written in C.
My assumptions • You're like Schwern. • Already a programmer, but raised on Ruby, Python, Java or PHP. • You don't know what it was like in the bad old days. • You want to work on open source projects.
Goals • As much territory as possible • As fast as possible • Danger zones • Impedance mismatches
Big differences • Nothing is DWIM. • All memory must be explicitly handled. • Nothing automatically does anything. • No strings extending. • No magic

+ Andy Lester, 11 months ago