FMT_COPYBYTES_SIZEOF_MINUS1(3)

✨ fmt_copybytes_sizeof_minus1 ✨

okay bestie, we're in the Library Functions Manual section 3 today and the star of the show is literally called fmt_copybytes_sizeof_minus1 💅 she's a mouthful but she's iconic

🎀 NAME 🎀

fmt_copybytes_sizeof_minus1 — write binary data 🦋

🌸 SYNTAX 🌸

#include <libowfat/fmt.h>

size_t fmt_copybytes_sizeof_minus1(char *dest,const char *source);

💖 DESCRIPTION 💖

okay so listen. this macro copies sizeof(source)-1 bytes from source into dest. that's it, that's the whole vibe ✨

it's giving convenience wrapper energy — a lil interface around fmt_copybytes for when you're building a binary message by smashing together hex constant strings, like this:

fmt_copybytes_sizeof_minus1(dest, "\x01\x02\x03\x04");

now here's the tea ☕ because source is technically a string, the compiler sneaks a 0 byte onto the end, and sizeof() will hand you the size including that lil 0 byte. which is rude. so that's literally why there's a minus 1 in this function — so we do NOT copy it and we do NOT count it. problem solved, periodt 🫶

👑 NOTE 👑

⚠️ Caution bestie: source must not have side effects, or those side effects will be evaluated twice. no cap, be careful 🙈

💜 SEE ALSO 💜

• fmt_copybytes(3)

that's the whole page fr fr — sending you love from the Library Functions Manual, section 3, where fmt_copyby...zeof_minus1(3) lives rent free 🌈💖 go forth and copy those bytes, you got this 🧚