Includes & Portability

Yesterday I made more progress on printf: It’s already handling all the flags except for the wildcard '*', which is the hardest. I also learned that some constant are located in different headers depending on the OS. A good example of this is ARG_MAX, that’s can be found in limits.h on macOS, and in linux/limits.h on linux. For portability reasons it’s a really good idea to check and include the system-appropriate headers in your projects, especially if you’re developing on linux (like I am).

• https://stackoverflow.com/questions/5919996/how-to-detect-reliably-mac-os-x-ios-linux-windows-in-c-preprocessor

# include <limits.h>

# ifdef __linux__
# include <linux / limits.h>
# endif

I hope to finish the printf by tomorrow if possible.