fmt_asn1derlength(3)

💖 fmt_asn1derlength(3) 💖

okay bestie, gather round, it's a Library Functions Manual moment and we're about to get into it ✨

🌸 NAME 🌸

fmt_asn1derlength — encode unsigned integer like ASN.1 DER length 🎀

✨ SYNTAX ✨

#include <libowfat/fmt.h>

size_t fmt_asn1derlength(char *dest,unsigned long long source);

🦋 DESCRIPTION 🦋

so like. fmt_asn1derlength encodes an unsigned integer using the ASN.1 DER rules for encoding tag lengths. no cap, that's the whole job. 💅

the way this works, it can take anywhere from 1 byte (for the range 0-0x7f) all the way up to sizeof(source)+1 bytes. so it's giving flexible. it's giving adaptive. it's giving main character energy. 👑

if dest equals FMT_LEN (i.e. it's NULL), then fmt_asn1derlength doesn't write anything — it just returns the number of bytes it would have written. lowkey the most useful trick ever. like, "hey how much room do i need?" and it just tells you. obsessed. 🙈

and for convenience (bestie behaviour fr fr), fmt.h defines the integer FMT_ASN1LENGTH to be big enough to contain every possible fmt_asn1derlength output. so you never have to guess at your buffer size. slay. 🫶

🌈 SEE ALSO 🌈

• scan_asn1derlength(3) — the reverse vibe, go check it out ✨

okay that's the whole page, you ate that 🍓 stay iconic, read your man pages, hydrate, and remember: this one came from the Library Functions Manual — fmt_asn1derlength(3) — and there's no date line on it so we're just vibing with the source, periodt 💅💖