5 ms·

I didn't even know that scnprintf was a thing. Cool! I learned something just by skimming the video

• ddtaylor 8y ago
  I think the presenter mentions it's only in Linux kernel though, not available in userspace.
  • chacham15 8y ago
    The userspace version is snprintf.
    • aboutruby 8y ago
      The speaker mentions it, seems like the return value is different: https://i.imgur.com/Jj2fMZu.png https://i.imgur.com/Jj2fMZu.png
      • Taniwha 8y ago
        yes - snprintf() returns the length of the string that would be written even if it wasn't clipped to the length of the output buffer - if you want to accumulate strings into a buffer using the output length to update the offset/size bad things will happen. scnprintf() returns the actual number of bytes written (less the null)
    • technion 8y ago
      There's a great write up here on how assuming scnprintf behaved like snprintf led to memory bugs: http://blog.infosectcbr.com.au/2018/11/memory-bugs-in-multiple-linux-kernel.html http://blog.infosectcbr.com.au/2018/11/memory-bugs-in-multip...
    • kzrdude 8y ago
      The C standard's snprintf is not like scnprintf.