Put %n back because everyone who said it was non-standard is stupid

[willeccles]

Everyone said it was non-standard, well guess what idiots, C99 standard 7.19.6.1 section 8 disagrees with you >:D

cfm got all slow and memory-inefficient because I actually listened to people on the internet, why did I ever do that?

[E5ten]

Since all the uses of %n in cfm seem to be at the end of the format string, couldn't you instead use printf's return value (which, on success, is the number of characters printed)? e.g.:

printf(" %zu/%zu%n", n ? s+1 : n, n, &count);

would become

count = printf(" %zu/%zu", n ? s+1 : n, n);

EDIT:
and it seems that while %n is standard, android's libc bionic doesn't seem to support it, which is a reason to switch to using the return value https://en.wikipedia.org/wiki/Bionic_(software)#Differences_from_POSIX

[willeccles]

I might do this, though not because of the Android thing. Android is in second place on the list of operating systems that cfm is not targeted at, following Windows, but in the interest of portability I suppose I could do this. A much better reason to do this is reducing the runtime and increasing security (theoretically) of printf.