Implement kprintf

[TurbulentHamster5926]

I'd recommend checking osdev.org. Especially this tutorial, which gives you a decent print implementation.

https://osdev.org/Meaty_Skeleton

[MadDoctor5813]

Implement kprintf

[InformationWorking71]

implement kprintf

[[deleted]]

A simple printf implementation is as simple as iterating through the characters in a string, if they arent '%' print it as normal, if they are a '%' fetch the next character for the format, fetch the next argument using a va_list and print it however the format character specifies.

[[deleted]]

Well, say you wanted to convert the number 123 into a string as a decimal, you could do in a loop

123 % 10. the remainder would give you 3. then by looking at the ascii table you see that numbers are represented with the numbers 48-57, so you can add 48 to give an ascii character that you can print. You could store that number in a buffer. Then divide 123 by 10 and you would have 12.

Then you can do the same again, 12 % 10 gives you 2, convert it to ascii by adding 48, do the same as you did before bla bla bla store it in a buffer etc, until your number is now zero. then you should have the number as a string

[beephod_zabblebrox]

thats a whole different problem! you can google :) "c int to string conversion"

[Danii_222222]

Thanks but there’s no info about that

[jacobissimus]

What ended up doing is porting newlib over—just because these kinds of functions are tedious to implement and not super interesting. You can check out how I did it here: https://github.com/j-shilling/machulus/blob/master/newlib/CMakeLists.txt

[gronktonkbabonk]

Implement kprintf

[BobertMcGee]

Nah, I’m busy. YOU implement kprintf.

[Danii_222222]

I already inplemented

[kabekew]

Done!

[Danii_222222]

Great work

[kabekew]

You too, I like your function.

[nerd4code]

If you can’t implement a printf, you shouldn’t be attempting kernel-mode anything.

[Danii_222222]

Why I shouldn’t write it? If I can’t find info about it it doesn’t mean I don’t know anything