fmt_double(3)

okay bestie, grab your iced coffee because we're diving into fmt_double(3) from the Library Functions Manual. she's a whole vibe and she's about to write some doubles for you. no cap. 💅

🎀 NAME 🎀

fmt_double — she writes an ASCII representation of a double. that's it. that's the tweet. literally her entire purpose. periodt. 💖

✨ SYNTAX ✨

first things first, you gotta include the header, bestie:

#include <libowfat/fmt.h>

and here's the function signature, copy it exactly or she will not answer:

size_t fmt_double(char *dest,double d,size_t maxlen,size_t prec);

💅 DESCRIPTION 💅

okay so boom. fmt_double writes an ASCII representation of d — and when I say ASCII, I mean '0' through '9', base 10, none of that hexadecimal nonsense — directly into dest. then she returns the number of bytes she actually wrote. so far so good? 🫶

but wait, there's a limit. she will not write more than maxlen bytes. that's the rule. don't try to make her write more, she won't. 🚫

and she's precise, okay? she writes exactly prec digits. and if she has to, she'll use scientific notation. because sometimes that's just the mood. ✨

bestie, listen. fmt_double does not append a \0. if you were expecting a null-terminated string, I'm so sorry, she's not that girl. you have to handle that yourself. 😭

one more thing — if dest equals FMT_LEN (i.e. it's zero), she doesn't write anything at all. instead she just tells you how many bytes she would have written. it's giving "window shopping". iconic. 👑

🔍 SEE ALSO 🔍

• scan_double(3) — the matching read vibe. go say hi. 💖

mwah 💖 this has been your bestie from the Library Functions Manual, fmt_double(3), signing off. stay precise, stay slay. ✨