scanf / printf : Enabling 8-bit types

[GiovanniCmpaner]

Hello everyone!

I need 8-bit types ("hh" length specifiers) when using scanf / printf, but they aren't enabled by default.

I could conclude it by looking at the headers:

inttypes.h
stdint.h
stdio.h
newlib.h

and noted the macro_WANT_IO_C99_FORMATS must be defined to enable them.

Reading the docs https://sourceware.org/newlib/README, before I compile the newlib, I must configure it with the flag --enable-newlib-io-c99-formats, but I don't know how to proceed, where I should do it, how to compile it, I couldn't easily find information about this.

Is there a "simpler"/"easier" way to enable 8-bit types?

[earlephilhower]

We don't compile with the full-fat IO types due to code and RAM usage limits, but it may be possible to hack in half-width types at some point

[GiovanniCmpaner]

To add some context, it would be especially useful when receiving IPv4 address, as I can't simply switch to int because the (ethernet, wifi) libraries expect byte arrays.

Right now, the simplest way is to convert the int array into byte array in a few lines, not that bad.

Thanks for answering after such a long time.

[GiovanniCmpaner]

I didn't think it would be done. Thanks for the improvement.