It's completely possible to implement printf. here is my impl (not 100% correct yet) of snprintf for my custom libc implemented on top of a platform I'm working on <https://zigbin.io/ab1e79>
The va_arg stuff are extern because zig's va arg stuff is pretty broken at the moment.
Here's a C++ game ported to web using said libc running on top of the custom platform and web frontend that implements the platform ABI <https://cloudef.pw/sorvi/#supertux.sorvi> (you might need javascript.options.wasm_js_promise_integration enabled if using firefox based browser)
yeah I just thought there are "compiler shenanigans" involved with printf! zig's va arg being broken is sad, I am so zig-pilled, I wish we could just call extern "C" functions with a tuple in place of va arg =D
The only thing C compilers do for printf, is static analyze the format string for API usage errors. Afaik such isn't possible in zig currently. But idk why'd you downgrade yourself to using the printf interface, when std.Io.Writer has a `print` interface where fmt is comptime and args can be reflected so it catches errors without special compiler shenigans.
You are still playing with fire as the data inside those pointers may be different even if they are the same type. Zig is free to optimize them in anyway it likes depending on the code that touches them (aka its free to assume they never leave the program).
I doubt zig will have stable abi any time soon. It may have some sort of "zig extern" when it gets mature. But stable abi isnt very usful if no-one else can talk it. I have project that uses codegen to effectively implement zig like ABI on top of the C abi.
kqueue is similar to epoll, it's readiness based and not completion like IOCP and io_uring. IOCP is nice in theory, but the api and the different ways everything has to be fed for it leaves a lot to be desired... Windows also has own version of iouring, but it's bit abandoned and only works for disk io which is shame, because it could have been nice new clean io api for windows.
> the api and the different ways everything has to be fed for it leaves a lot to be desired
I think Microsoft fixed that in Windows Vista by providing a higher-level APIs on top of IOCP. See CreateThreadpoolIo, CloseThreadpoolIo, StartThreadpoolIo, and WaitForThreadpoolIoCallbacks WinAPI functions.
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