ref: 9f18b0f388a38a35ea8920fe3e98c7f8e3a41cf2
dir: /sys/man/2/isalpharune/
.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/runetype.c .SH "SEE ALSO .IR ctype (2) , .IR "The Unicode Standard" .