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trimdomain.c: New file in libutil
This commit is contained in:
Joel Sherrill
parent
44ee042822
commit
4b8600a006
85
freebsd-userspace/lib/libutil/trimdomain.3
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85
freebsd-userspace/lib/libutil/trimdomain.3
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.\" Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd April 7, 1999
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.Dt TRIMDOMAIN 3
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.Os
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.Sh NAME
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.Nm trimdomain
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.Nd "trim the current domain name from a host name"
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.Sh LIBRARY
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.Lb libutil
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.Sh SYNOPSIS
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.In sys/types.h
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.In libutil.h
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.Ft void
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.Fn trimdomain "char *fullhost" "int hostsize"
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.Sh DESCRIPTION
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The function
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.Fn trimdomain
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removes the current domain name from the passed
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.Ar fullhost
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name by writing a
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.Dv NUL
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character over the first period of the passed name.
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The current domain
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name is determined by calling
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.Xr gethostname 3
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and removing everything up to the first period.
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The name is determined
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the first time this function is called and is cached for future use.
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.Pp
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The
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.Fn trimdomain
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function will only trim the domain name if the passed
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.Ar fullname
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ends with the current domain name and if the length of the resulting host
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name does not exceed
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.Ar hostsize .
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.Pp
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If the passed
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.Ar fullname
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is actually a
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.Dv DISPLAY
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specification of the form
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.Sm off
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.Ar host . domain : nn Oo .
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.Ar nn
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.Oc
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.Sm on
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and the domain name is the same as the local domain name,
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.Fn trimdomain
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will remove the embedded domain name, copying the screen and display
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numbers to the end of the base host name and resulting in
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.Sm off
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.Ar host : nn Op . Ar nn .
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.Sm on
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.Sh RETURN VALUES
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The
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.Fn trimdomain
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function does not return a value.
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.Sh SEE ALSO
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.Xr gethostname 3
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118
freebsd-userspace/lib/libutil/trimdomain.c
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118
freebsd-userspace/lib/libutil/trimdomain.c
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#ifdef __rtems__
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#include "port_before.h"
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#endif
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/*-
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* Copyright (c) 2001 Brian Somers <brian@Awfulhak.org>
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* Based on original work by Atsushi Murai <amurai@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <libutil.h>
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#include <string.h>
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#include <unistd.h>
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static int isDISP(const char *);
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/*-
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* Trim the current domain name from fullhost, but only if the result
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* is less than or equal to hostsize in length.
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*
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* This function understands $DISPLAY type fullhosts.
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*
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* For example:
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*
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* trimdomain("abcde.my.domain", 5) -> "abcde"
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* trimdomain("abcde.my.domain", 4) -> "abcde.my.domain"
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* trimdomain("abcde.my.domain:0.0", 9) -> "abcde:0.0"
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* trimdomain("abcde.my.domain:0.0", 8) -> "abcde.my.domain:0.0"
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*/
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void
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trimdomain(char *fullhost, int hostsize)
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{
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static size_t dlen;
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static int first = 1;
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static char domain[MAXHOSTNAMELEN];
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char *end, *s;
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size_t len;
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if (first) {
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/* XXX: Should we assume that our domain is this persistent ? */
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first = 0;
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if (gethostname(domain, sizeof(domain) - 1) == 0 &&
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(s = strchr(domain, '.')) != NULL)
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memmove(domain, s + 1, strlen(s + 1) + 1);
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else
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domain[0] = '\0';
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dlen = strlen(domain);
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}
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if (domain[0] == '\0')
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return;
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s = fullhost;
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end = s + hostsize + 1;
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if ((s = memchr(s, '.', (size_t)(end - s))) != NULL) {
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if (strncasecmp(s + 1, domain, dlen) == 0) {
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if (s[dlen + 1] == '\0') {
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/* Found -- lose the domain. */
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*s = '\0';
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} else if (s[dlen + 1] == ':' &&
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isDISP(s + dlen + 2) &&
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(len = strlen(s + dlen + 1)) < (size_t)(end - s)) {
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/* Found -- shuffle the DISPLAY back. */
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memmove(s, s + dlen + 1, len + 1);
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}
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}
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}
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}
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/*
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* Is the given string NN or NN.NN where ``NN'' is an all-numeric string ?
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*/
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static int
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isDISP(const char *disp)
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{
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size_t w;
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int res;
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w = strspn(disp, "0123456789");
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res = 0;
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if (w > 0) {
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if (disp[w] == '\0')
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res = 1; /* NN */
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else if (disp[w] == '.') {
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disp += w + 1;
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w = strspn(disp, "0123456789");
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if (w > 0 && disp[w] == '\0')
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res = 1; /* NN.NN */
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}
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}
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return (res);
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}
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