fuck off

cringe

Cute, but this is GCC, not C. Also the format of (n-1) using %d is not portable since %d requires an int but n is a (size_t).

so it won't work on smth like msvc

not standard -_-

I didn't know about asprintf :S Did malloc variant but it didn't work at cw.

2^64 ~= 1,84*10^19, so 20 chars enough (21 bytes with '\0'), use memory from stack with align (char num[32]), memory allocating in heap may be long and it uses memory not effective, becouse it operates with large blocks. BTW you forget to free memory that asprintf allocated, your function have memory leak.

#define _GNU_SOURCE

https://man7.org/linux/man-pages/man3/asprintf.3.html

As far as i can see asprintf() is not std-C

Nicely done !

#define _GNU_SOURCE is an unnecessary line :)