a strong contender for the stupidest undefined behavior in C (thanks for reminding about this one @shafikyaghmour)pic.twitter.com/mBWojVSaMF
Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.
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a strong contender for the stupidest undefined behavior in C (thanks for reminding about this one @shafikyaghmour)pic.twitter.com/mBWojVSaMF
It would be nice if there were annotations to _why_ the UBs were made.
Motivation seems clear: allowing compiler to be written portably using stdio text mode.
but as always, when there is a choice of acceptable behaviors, the right answer is to make it implementation-defined
Well the compiler itself would have undefined behavior if it's written in C and it reads in text mode a file that's not a text file. :-)
To make it implementation-defined, you'd be mandating that the compiler has to handle this case, which can't be done portably in C.
Thus you'd be precluding writing the C compiler in portable C.
I didn't think a C compiler _could_ be written in portable C thanks the stdarg.h hell and offsetof()?
You're confusing writing the compiler in portable C with writing headers that work on an arbitrary compiler.
But the stdarg.h header _has_ to be implemented in some form to be compliant. I _suppose_ I could embed stdarg.h into the compiler itself >>
The stdarg.h provided by your C implementation has nothing to do with the C implementation used to compile your compiler.
... yea you're right w/ your first tweet. I'm confusing myself, sorry :P.
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