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.\" $FreeBSD$ 26.\" 27.Dd April 7, 1999 28.Dt TRIMDOMAIN 3 29.Os 30.Sh NAME 31.Nm trimdomain 32.Nd "trim the current domain name from a host name" 33.Sh LIBRARY 34.Lb libutil 35.Sh SYNOPSIS 36.In sys/types.h 37.In libutil.h 38.Ft void 39.Fn trimdomain "char *fullhost" "int hostsize" 40.Sh DESCRIPTION 41The function 42.Fn trimdomain 43removes the current domain name from the passed 44.Ar fullhost 45name by writing a 46.Dv NUL 47character over the first period of the passed name. 48The current domain 49name is determined by calling 50.Xr gethostname 3 51and removing everything up to the first period. 52The name is determined 53the first time this function is called and is cached for future use. 54.Pp 55The 56.Fn trimdomain 57function will only trim the domain name if the passed 58.Ar fullname 59ends with the current domain name and if the length of the resulting host 60name does not exceed 61.Ar hostsize . 62.Pp 63If the passed 64.Ar fullname 65is actually a 66.Dv DISPLAY 67specification of the form 68.Sm off 69.Ar host . domain : nn Oo . 70.Ar nn 71.Oc 72.Sm on 73and the domain name is the same as the local domain name, 74.Fn trimdomain 75will remove the embedded domain name, copying the screen and display 76numbers to the end of the base host name and resulting in 77.Sm off 78.Ar host : nn Op . Ar nn . 79.Sm on 80.Sh RETURN VALUES 81The 82.Fn trimdomain 83function does not return a value. 84.Sh SEE ALSO 85.Xr gethostname 3 86.Sh HISTORY 87The function 88.Fn trimdomain 89first appeared in 90.Fx 3.2 . 91