1.\" Copyright (c) 1999 Brian Somers <brian@Awfulhak.org> 2.\" 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.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.Dd April 7, 1999 26.Dt TRIMDOMAIN 3 27.Os 28.Sh NAME 29.Nm trimdomain 30.Nd "trim the current domain name from a host name" 31.Sh LIBRARY 32.Lb libutil 33.Sh SYNOPSIS 34.In sys/types.h 35.In libutil.h 36.Ft void 37.Fn trimdomain "char *fullhost" "int hostsize" 38.Sh DESCRIPTION 39The function 40.Fn trimdomain 41removes the current domain name from the passed 42.Ar fullhost 43name by writing a 44.Dv NUL 45character over the first period of the passed name. 46The current domain 47name is determined by calling 48.Xr gethostname 3 49and removing everything up to the first period. 50The name is determined 51the first time this function is called and is cached for future use. 52.Pp 53The 54.Fn trimdomain 55function will only trim the domain name if the passed 56.Ar fullname 57ends with the current domain name and if the length of the resulting host 58name does not exceed 59.Ar hostsize . 60.Pp 61If the passed 62.Ar fullname 63is actually a 64.Dv DISPLAY 65specification of the form 66.Sm off 67.Ar host . domain : nn Oo . 68.Ar nn 69.Oc 70.Sm on 71and the domain name is the same as the local domain name, 72.Fn trimdomain 73will remove the embedded domain name, copying the screen and display 74numbers to the end of the base host name and resulting in 75.Sm off 76.Ar host : nn Op . Ar nn . 77.Sm on 78.Sh RETURN VALUES 79The 80.Fn trimdomain 81function does not return a value. 82.Sh SEE ALSO 83.Xr gethostname 3 84.Sh HISTORY 85The function 86.Fn trimdomain 87first appeared in 88.Fx 3.2 . 89