1.\" Copyright (c) 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.Dd April 3, 2022 29.Dt CTYPE 3 30.Os 31.Sh NAME 32.Nm digittoint , 33.Nm isalnum , 34.Nm isalpha , 35.Nm isascii , 36.Nm isblank , 37.Nm iscntrl , 38.Nm isdigit , 39.Nm isgraph , 40.Nm ishexnumber , 41.Nm isideogram , 42.Nm islower , 43.Nm isnumber , 44.Nm isphonogram , 45.Nm isprint , 46.Nm ispunct , 47.Nm isrune , 48.Nm isspace , 49.Nm isspecial , 50.Nm isupper , 51.Nm isxdigit , 52.Nm toascii , 53.Nm tolower , 54.Nm toupper 55.Nd character classification functions 56.Sh LIBRARY 57.Lb libc 58.Sh SYNOPSIS 59.In ctype.h 60.Ft int 61.Fn digittoint "int c" 62.Ft int 63.Fn isalnum "int c" 64.Ft int 65.Fn isalpha "int c" 66.Ft int 67.Fn isascii "int c" 68.Ft int 69.Fn iscntrl "int c" 70.Ft int 71.Fn isdigit "int c" 72.Ft int 73.Fn isgraph "int c" 74.Ft int 75.Fn ishexnumber "int c" 76.Ft int 77.Fn isideogram "int c" 78.Ft int 79.Fn islower "int c" 80.Ft int 81.Fn isnumber "int c" 82.Ft int 83.Fn isphonogram "int c" 84.Ft int 85.Fn isspecial "int c" 86.Ft int 87.Fn isprint "int c" 88.Ft int 89.Fn ispunct "int c" 90.Ft int 91.Fn isrune "int c" 92.Ft int 93.Fn isspace "int c" 94.Ft int 95.Fn isupper "int c" 96.Ft int 97.Fn isxdigit "int c" 98.Ft int 99.Fn toascii "int c" 100.Ft int 101.Fn tolower "int c" 102.Ft int 103.Fn toupper "int c" 104.Sh DESCRIPTION 105The above functions perform character tests and conversions on the integer 106.Fa c . 107They are available as macros, defined in the include file 108.In ctype.h , 109or as true functions in the C library. 110See the specific manual pages for more information. 111.Sh SEE ALSO 112.Xr digittoint 3 , 113.Xr isalnum 3 , 114.Xr isalpha 3 , 115.Xr isascii 3 , 116.Xr isblank 3 , 117.Xr iscntrl 3 , 118.Xr isdigit 3 , 119.Xr isgraph 3 , 120.Xr isideogram 3 , 121.Xr islower 3 , 122.Xr isphonogram 3 , 123.Xr isprint 3 , 124.Xr ispunct 3 , 125.Xr isrune 3 , 126.Xr isspace 3 , 127.Xr isspecial 3 , 128.Xr isupper 3 , 129.Xr isxdigit 3 , 130.Xr toascii 3 , 131.Xr tolower 3 , 132.Xr toupper 3 , 133.Xr wctype 3 , 134.Xr ascii 7 135.Sh STANDARDS 136These functions, except for 137.Fn digittoint , 138.Fn isascii , 139.Fn ishexnumber , 140.Fn isideogram , 141.Fn isnumber , 142.Fn isphonogram , 143.Fn isrune , 144.Fn isspecial 145and 146.Fn toascii , 147conform to 148.St -isoC . 149.Sh HISTORY 150The functions 151.Fn isalpha , 152.Fn isupper , 153.Fn islower , 154.Fn isdigit , 155.Fn isalnum , 156.Fn isspace , 157.Fn ispunct , 158.Fn isprint , 159.Fn iscntrl , 160and 161.Fn isascii 162first appeared in 163.At v7 . 164