term% cat index.txt ISALPHARUNE(2) System Calls Manual ISALPHARUNE(2)
NAME
isalpharune, islowerrune, isspacerune, istitlerune, isupperrune, isdig‐
itrune, 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)
int isdigitrune(Rune c)
Rune tolowerrune(Rune c)
Rune totitlerune(Rune c)
Rune toupperrune(Rune c)
DESCRIPTION
These routines examine and operate on Unicode characters, in particular
a subset of their properties as defined in the Unicode standard. Uni‐
code defines some characters as alphabetic and specifies three cases:
upper, lower, and title. Analogously to ctype(2) for ASCII, these rou‐
tines test types and modify cases for Unicode characters. The names
are self-explanatory.
The case-conversion routines return the character unchanged if it has
no case.
SOURCE
/sys/src/libc/port/runetype.c
SEE ALSO
ctype(2), The Unicode Standard.
ISALPHARUNE(2)