Q_IFRAWMASK(3)

okay bestie, welcome to Q_IFRAWMASK(3) from the Library Functions Manual — the fixed-point math page that’s lowkey iconic and highkey here to explain the combined integer/fractional data bits situation. 💅✨

✨ NAME ✨

The whole squad: Q_IFRAWMASK, Q_IFVALIMASK, Q_IFVALFMASK, Q_GIFRAW, Q_GIFABSVAL, Q_GIFVAL, Q_SIFVAL, Q_SIFVALS — fixed-point math functions which manipulate the combined integer/fractional data bits. 🫶

🛠️ SYNOPSIS 🛠️

#include <sys/qmath.h>

ITYPE
Q_IFRAWMASK(QTYPE q);

ITYPE
Q_IFVALIMASK(QTYPE q);

ITYPE
Q_IFVALFMASK(QTYPE q);

ITYPE
Q_GIFRAW(QTYPE q);

ITYPE
Q_GIFABSVAL(QTYPE q);

ITYPE
Q_GIFVAL(QTYPE q);

QTYPE
Q_SIFVAL(QTYPE q, ITYPE ifv);

QTYPE
Q_SIFVALS(QTYPE q, ITYPE iv, ITYPE fv);

💖 DESCRIPTION 💖

• Q_IFRAWMASK() — returns a q-specific bit mask for q’s combined integer and fractional data bits. 🎀
• Q_IFVALIMASK() and Q_IFVALFMASK() — return q-specific bit masks for the integer and fractional bits of q’s combined integer and fractional data bits value, i.e., are applicable to the values returned by Q_GIFABSVAL() and Q_GIFVAL(). 🦋
• Q_GIFRAW() — returns q’s raw masked integer/fractional data bits. ✨
• Q_GIFABSVAL() and Q_GIFVAL() — return the absolute and real values of q’s integer/fractional data bits respectively. 💫
• Q_SIFVAL() — sets q’s combined integer/fractional data bits to the value ifv, whereas Q_SIFVALS() independently sets q’s integer and fractional data bits to the separate values iv and fv. 🔥

All of those functions operate on the following data types: s8q_t, u8q_t, s16q_t, u16q_t, s32q_t, u32q_t, s64q_t, and u64q_t, which are referred to generically as QTYPE. The ITYPE refers to the stdint(7) integer types. 🧚

For more details, see qmath(3). 👑

🌈 RETURN VALUES 🌈

Okay so the return-value roster is literally Q_IFRAWMASK(), Q_IFVALIMASK(), Q_IFVALFMASK(), Q_GIFABSVAL(), Q_GIFVAL(), Q_GIFRAW(), Q_GIFABSVAL() and Q_GIFVAL() — yes, Q_GIFABSVAL() and Q_GIFVAL() are in there twice, and they return their respective values as integers of the same underlying ITYPE as q. 💀 No cap, that’s the list.

Q_SIFVAL() and Q_SIFVALS() return the value of q post change. Slay. 💅

👀 SEE ALSO 👀

• errno(2)
• qmath(3)
• stdint(7)

🌸 HISTORY 🌸

The qmath(3) functions first appeared in FreeBSD 13.0. ✨

👑 AUTHORS 👑

The qmath(3) functions and this manual page were written by Lawrence Stewart <lstewart@FreeBSD.org> and sponsored by Netflix, Inc. 🫶

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💖 source/version: Debian • date: July 8, 2018 • manual: Q_IFRAWMASK(3) — bye bestie, go make those bits behave! 🧚‍♀️🌈