ecma · HackerTrans

It's not clear to me if the author actually understands how staging works and how that affects the commands they suggest. They claim that stashing takes staged changes and then note that after stashing the working tree will be clean. That suggests the post is being dumbed down or the author is misunderstanding things.

Git guidance should almost always start with a brief introduction to the concepts you believe the audience doesn't know or fully understand. To begin with reset and not properly explain the index will just end up being confusing, especially with brief references to hard, soft and mixed resets later on!

ecma

8 anni fadiscuss

Really? I'm not sure if this is bait or not, but 64b time_t extends the epoch over 200 billion years into the future. I figure we'll handle it in Linux 7.0 or 8.0 at the earliest :P

ecma

8 anni fadiscuss

Thanks, I hate it. I'm a bit bemused about this bizarro case_N.h trickery. I'm also almost positive __COUNTER__ would be adequate and entirely remove the need for __LINE__ as suggested in the addendum which is likely to be quite large in any non-trivial source unit. I mean, something gcc this way comes I guess...

ecma

8 anni fadiscuss

This puzzled me also. Perhaps it's been kicked down the road as an engineering problem and we'd end up with a hydrogen extraction system which is responsible for that part. We'd probably need to feed protons back in though...

ecma

8 anni fadiscuss

The first paragraph of that question says 'address the possibility that a US company may have had spacecraft launched into orbit without the appropriate approval from the US government.'

This is a discussion of another offence against a different document and assumes the first offence against FCC regulations is valid. Be careful not to conflate the two, one causes the other.

ecma

8 anni fadiscuss

I make heavy use of cardless cash via my bank's app when I need to visit an ATM. I haven't had my wallet with me for more than half an hour at a time this year.

ecma

9 anni fadiscuss

This isn't wrong but I've got issues with some of the examples, especially the lack of a solution for #2 and #4.

#2 is referred to as an unsafe macro because of the multiple evaluation of its arguments. In some cases this is fine but it may need to be documented that the macro is unsafe for future users. It is also entirely possible to convert these macros into safe ones if you're willing/able to use GNU C extensions like typeof. The SEI CERT secure C wiki has a good reference for this at [0].

#3 presumes you want to compose functions but I'd suggest that by doing so you are writing bad C. Because of the lack of any type of side-band error reporting (exceptions etc) you must presume that your functions will always return a sane/non-error value. That's not a good assumption even for your own code and definitely not for the C library or any other libs. In addition, this is just another unsafe macro which could be made safe as above.

#4 doesn't explain the solution to the problem it poses which is annoying because it's the most important one IMO. There are a number of ways to make a multi-line macro safe for use in an unbraced expression body. My preferred way is to define the macro with a always false-post check while loop. e.g.

    #define MY_NAME_JEF(x) do{ \
        const char jef[] = "jef"; \
        printf("my name %s, not %s\n", jef, x); \
    }while(0)

Note the lack of a trailing semi-colon. This is because we expect the macro to be terminated with its own semi-colon. Stupid example but it gets the point across I suppose.

Check out the secure C wiki, it's full of gems which can help you avoid issues with macros, and much more.

[0] https://wiki.sei.cmu.edu/confluence/display/c/PRE31-C.+Avoid...

ecma

9 anni fadiscuss

That's a K&R (Kernighan and Ritchie) style function declaration. Compilers still support it but the version you'd be more familiar with (ANSI C style) has been standard since at least the late 80s IIRC. ANSI C was standardised in 1989 but that process had been in progress for something like 5 years beforehand.

ecma

9 anni fadiscuss

Did you genuinely find it difficult to parse the comma delimited representation near the bottom of the article? Just curious. It seemed very natural to me, a minor variation on British style thousand separators.

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