How to implement printf without any standard libraries, from parsing the format string, passing variadic arguments to formatting numbers and implementing x86 division. 

Links:
- Discord channel: https://discord.gg/RgHc5XrCEw
- Source code: https://github.com/chibicitiberiu/nanobyte_os/releases/tag/Part5
- Cdecl explanation: https://youtu.be/F3XiH78erNM?t=1615

Tools:
- Open Watcom 2: https://github.com/open-watcom/open-watcom-v2


Documentation:
- OpenWatcom manuals (in installation directory)
- Calling conventions: https://en.wikipedia.org/wiki/X86_calling_conventions
- Ralf Brown's Interrupt List: http://www.ctyme.com/rbrown.htm
- Intel manuals: https://software.intel.com/content/www/us/en/develop/articles/intel-sdm.html#combined
- Complex 64-bit division implementation: https://github.com/open-watcom/open-watcom-v2/blob/master/bld/clib/cgsupp/a/i8d086.asm


Chapters:
0:00 Introduction
0:38 The plan
1:44 Passing varargs
7:07 Parsing the format string
12:35 Implementation
20:36 Division issues
23:41 Long division
25:25 Implementation of long division
28:55 Conclusion