kstrtodec64(9)

📦 version 7.3.1, in nixpkgs unstable

💅 kstrtodec64(9)

okay bestie, welcome to the Kernel API Manual ✨ today we're looking at kstrtodec64 and honestly? she's iconic. this one converts a string into a signed 64-bit scaled decimal value and she does it flawlessly, no cap 🫶

✨ NAME ✨

kstrtodec64 — Convert a string to a signed 64-bit scaled decimal value. literally her whole personality 💖

🌸 SYNOPSIS 🌸

int kstrtodec64 (const char *s , unsigned int scale , s64 *res );

🎀 ARGUMENTS 🎀

  • s — the start of the string, bestie. she must be null-terminated, and she's also allowed to have a single newline sitting right before that terminating null (yes she's flexible like that 💁‍♀️). the very first character can also be a plus sign or a minus sign, so go off king 👑
  • scale — the number of digits to the right of the decimal point. this is her main character number fr 🔥
  • res — where the result of the conversion gets written when everything goes right. this is the spot where the slay gets delivered 💌

🦋 DESCRIPTION 🦋

okay so picture this: a scale of 4 with the input "-3.141592" gives you -31415. that's it, that's the vibe ✨

and listen — digits beyond the specified scale are ignored 🙈 like, they simply don't make the cut. also, you do not need to pad in trailing zeros in the fractional part just to match the scale. she's low-maintenance, she's chill, she ate 💅

⭐ RETURN ⭐

  • 0 on success 🎉
  • -ERANGE on overflow 😭
  • -EINVAL on parsing error 💀

like, three outcomes and she's honest about all of them. we love a transparent queen 🌈

🍓 SEE ALSO 🍓

the whole friend group!! go say hi to her sisters, they're all serving 💜

ngl bestie, if you're passing a string that isn't null-terminated, or you've got more than one sneaky newline chilling at the end, that's on you. the rules are the rules 🙈

and that's the whole page, bestie!! this one lives in ./lib, dated October 2026, and she goes by kstrtodec64(9) 💖 mwah, go convert something iconic 🧚‍♀️✨

📦 where this page comes from