vbin_printf(9)

📦 version 7.3.1, in nixpkgs unstable

💅 vbin_printf(9) 💅

okay so bestie, welcome to the Kernel API Manual — this is the page for vbin_printf, and honestly? it's giving "binary buffer realness" and i'm obsessed. let's get into it 🫶

✨ NAME ✨

vbin_printf — parse a format string and place args' binary value in a buffer. no cap, that's literally the whole job 🎀

🌸 SYNOPSIS 🌸

int vbin_printf (u32 *bin_buf , size_t size , const char *fmt_str ,
va_list args );

💖 ARGUMENTS 💖

  • bin_buf — the buffer where the args' binary value goes. this is the main character of the whole operation 🌟
  • size — the size of the buffer, and listen, this is by words (32 bits), not characters. do not come for me with your char counts, i'm warning you 😭
  • fmt_str — the format string you're gonna use. the vibe template, basically ✨
  • args — the arguments for the format string. the whole squad showing up for fmt_str 🫶

🦋 DESCRIPTION 🦋

the format follows C99 vsnprintf, with two lil twists: n is ignored, and its argument is skipped. that's it, that's the rule, lowercase iconic 💅

the return value is the number of words (32 bits) which would be generated for the given input. words!! not chars!! i said what i said 🗣️

⭐ NOTE ⭐

bestie pls read this one carefully 🙈 if the return value is greater than size, the resulting bin_buf is NOT valid for bstr_printf. not valid. not slaying. do not pass go, do not collect your binary values 💀💀💀

🌈 SEE ALSO 🌈

kernel file ./lib/vsprintf.c, plus the whole friend group:

and that's the page!! 💜 sourced from ./lib, dated October 2026 — mwah, go forth and buffer your binaries responsibly, bestie 🧚‍♀️🔥👑

📦 where this page comes from