shithub: riscv

ref: e38d42b4a7f278a7f7835e07983115e4ee1b0db4
dir: /sys/man/2/isalpharune/

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.TH ISALPHARUNE 2
.SH NAME
isalpharune, islowerrune, isspacerune, istitlerune, isupperrune, isdigitrune, tolowerrune, totitlerune, toupperrune \- Unicode character classes and cases
.SH SYNOPSIS
.B #include <u.h>
.br
.B #include <libc.h>
.PP
.B
int isalpharune(Rune c)
.PP
.B
int islowerrune(Rune c)
.PP
.B
int isspacerune(Rune c)
.PP
.B
int istitlerune(Rune c)
.PP
.B
int isupperrune(Rune c)
.PP
.B
int isdigitrune(Rune c)
.PP
.B
Rune tolowerrune(Rune c)
.PP
.B
Rune totitlerune(Rune c)
.PP
.B
Rune toupperrune(Rune c)
.SH DESCRIPTION
These routines examine and operate on Unicode characters,
in particular 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.
Analogously to
.IR ctype (2)
for
.SM ASCII\c
,
these routines
test types and modify cases for Unicode characters.
The names are self-explanatory.
.PP
The case-conversion routines return the character unchanged if it has no case.
.SH SOURCE
.B /sys/src/libc/port/mkrunetype.c
.br
.B /sys/src/libc/port/runeistype.c
.br
.B /sys/src/libc/port/runetotype.c
.SH "SEE ALSO
.IR ctype (2) ,
.IR "The Unicode Standard" .