printf is about 700 lines in musl libc https://git.musl-libc.org/cgit/musl/tree/src/stdio/vfprintf.c https://git.musl-libc.org/cgit/musl/tree/src/stdio/vfprintf

printf is about 700 lines in musl libc https://git.musl-libc.org/cgit/musl/tree/src/stdio/vfprintf.c https://git.musl-libc.org/cgit/musl/tree/src/stdio/vfprintf.... and there's no language-level type safety, although plenty of tools lint printf now