is it possible write to console without stdlibs? c/c++

Question

I am programming on an arm microprocessor and am trying to debug using print statements via UART. I do not want to add stdlibs just for debugging. Is there a way to

Answer 1

I have found for background debugging, enqueuing characters into a circular buffer which is then drained by a polling routine on the uart transmit register, is my method of choice.

The enqueuing routines are based around a character, string and the variable size (to either hex or fixed width decimal). And a deluxe buffer routine could indicate an overflow with a reserved character.

The approach has the lowest overhead/impact on target operation, can be used (with care) in interrupt routine and the idea is easily transferable, so I have ignored the debugger on all the systems I have used.