ISALPHARUNE(3)

🌸 ISALPHARUNE(3) — Unicode character classes and cases 🎀

Okay bestie, this is ISALPHARUNE(3) from the Library Functions Manual, and it's all about the Unicode character-class and case routines. The names are literally self-explanatory 💅✨

✨ NAME ✨

isalpharune, islowerrune, isspacerune, istitlerune, isupperrune, tolowerrune, totitlerune, toupperrune — Unicode character classes and cases.

🦋 SYNOPSIS 🦋

#include <u.h>
#include <libc.h>

int isalpharune(Rune c)

int islowerrune(Rune c)

int isspacerune(Rune c)

int istitlerune(Rune c)

int isupperrune(Rune c)

Rune tolowerrune(Rune c)

Rune totitlerune(Rune c)

Rune toupperrune(Rune c)

💖 DESCRIPTION 💖

These routines examine and operate on Unicode characters, specifically a subset of their properties as defined in the Unicode standard. Unicode defines some characters as alphabetic and specifies three cases: upper, lower, and title.

Think of them as the Unicode glow-up of isalpha(3) for ASCII: these routines test types and modify cases for Unicode characters 🦋

Here's the quick tour, because the names are doing exactly what they say:

• int isalpharune(Rune c) — the alphabetic type test for c.
• int islowerrune(Rune c) — the lower-case type test for c.
• int isspacerune(Rune c) — the space type test for c.
• int istitlerune(Rune c) — the title-case type test for c.
• int isupperrune(Rune c) — the upper-case type test for c.
• Rune tolowerrune(Rune c) — converts c to lower case.
• Rune totitlerune(Rune c) — converts c to title case.
• Rune toupperrune(Rune c) — converts c to upper case.

Important vibe check, bestie: the case-conversion routines return the character unchanged if it has no case. No case? No changes. Periodt 💅

📁 SOURCE 📁

• /src/lib9/utf/runetype.c — where this whole thing lives 🫶

👀 SEE ALSO 👀

• isalpha(3)
• The Unicode Standard.

That's the page, bestie 🫶 — ISALPHARUNE(3) from the Library Functions Manual. Source check: /src/lib9/utf/runetype.c. Footer check: it literally just says ISALPHARUNE(3) again, with no date listed, so I'm not inventing one 💀✨