trimdomain.3

   1 .\" Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
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  25 .\" $FreeBSD: src/lib/libutil/trimdomain.3,v 1.8 2004/07/02 23:52:20 ru Exp $
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  27 .Dd April 7, 1999
  28 .Os
  29 .Dt TRIMDOMAIN 3
  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
  41 The function
  42 .Fn trimdomain
  43 removes the current domain name from the passed
  44 .Ar fullhost
  45 name by writing a
  46 .Dv NUL
  47 character over the first period of the passed name.
  48 The current domain
  49 name is determined by calling
  50 .Xr gethostname 3
  51 and removing everything up to the first period.
  52 The name is determined
  53 the first time this function is called and is cached for future use.
  54 .Pp
  55 The
  56 .Fn trimdomain
  57 function will only trim the domain name if the passed
  58 .Ar fullname
  59 ends with the current domain name and if the length of the resulting host
  60 name does not exceed
  61 .Ar hostsize .
  62 .Pp
  63 If the passed
  64 .Ar fullname
  65 is actually a
  66 .Dv DISPLAY
  67 specification of the form
  68 .Sm off
  69 .Ar host . domain : nn Oo .
  70 .Ar nn
  71 .Oc
  72 .Sm on
  73 and the domain name is the same as the local domain name,
  74 .Fn trimdomain
  75 will remove the embedded domain name, copying the screen and display
  76 numbers 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
  81 The
  82 .Fn trimdomain
  83 function does not return a value.
  84 .Sh SEE ALSO
  85 .Xr gethostname 3