source: rtems-libbsd/freebsd/lib/libutil/trimdomain.c @ 3d1e767

55-freebsd-126-freebsd-12freebsd-9.3
Last change on this file since 3d1e767 was d48955b, checked in by Sebastian Huber <sebastian.huber@…>, on 11/06/13 at 08:02:16

Add and use <machine/rtems-bsd-user-space.h>

  • Property mode set to 100644
File size: 3.4 KB
Line 
1#include <machine/rtems-bsd-user-space.h>
2
3/*-
4 * Copyright (c) 2001 Brian Somers <brian@Awfulhak.org>
5 *   Based on original work by Atsushi Murai <amurai@FreeBSD.org>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 */
30
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD$");
33
34#include <rtems/bsd/sys/param.h>
35
36#include <libutil.h>
37#include <string.h>
38#include <unistd.h>
39
40static int      isDISP(const char *);
41
42/*-
43 * Trim the current domain name from fullhost, but only if the result
44 * is less than or equal to hostsize in length.
45 *
46 * This function understands $DISPLAY type fullhosts.
47 *
48 * For example:
49 *
50 *     trimdomain("abcde.my.domain", 5)       ->   "abcde"
51 *     trimdomain("abcde.my.domain", 4)       ->   "abcde.my.domain"
52 *     trimdomain("abcde.my.domain:0.0", 9)   ->   "abcde:0.0"
53 *     trimdomain("abcde.my.domain:0.0", 8)   ->   "abcde.my.domain:0.0"
54 */
55void
56trimdomain(char *fullhost, int hostsize)
57{
58        static size_t dlen;
59        static int first = 1;
60        static char domain[MAXHOSTNAMELEN];
61        char *end, *s;
62        size_t len;
63
64        if (first) {
65                /* XXX: Should we assume that our domain is this persistent ? */
66                first = 0;
67                if (gethostname(domain, sizeof(domain) - 1) == 0 &&
68                    (s = strchr(domain, '.')) != NULL)
69                        memmove(domain, s + 1, strlen(s + 1) + 1);
70                else
71                        domain[0] = '\0';
72                dlen = strlen(domain);
73        }
74
75        if (domain[0] == '\0')
76                return;
77
78        s = fullhost;
79        end = s + hostsize + 1;
80        if ((s = memchr(s, '.', (size_t)(end - s))) != NULL) {
81                if (strncasecmp(s + 1, domain, dlen) == 0) {
82                        if (s[dlen + 1] == '\0') {
83                                /* Found -- lose the domain. */
84                                *s = '\0';
85                        } else if (s[dlen + 1] == ':' &&
86                            isDISP(s + dlen + 2) &&
87                            (len = strlen(s + dlen + 1)) < (size_t)(end - s)) {
88                                /* Found -- shuffle the DISPLAY back. */
89                                memmove(s, s + dlen + 1, len + 1);
90                        }
91                }
92        }
93}
94
95/*
96 * Is the given string NN or NN.NN where ``NN'' is an all-numeric string ?
97 */
98static int
99isDISP(const char *disp)
100{
101        size_t w;
102        int res;
103
104        w = strspn(disp, "0123456789");
105        res = 0;
106        if (w > 0) {
107                if (disp[w] == '\0')
108                        res = 1;        /* NN */
109                else if (disp[w] == '.') {
110                        disp += w + 1;
111                        w = strspn(disp, "0123456789");
112                        if (w > 0 && disp[w] == '\0')
113                                res = 1;        /* NN.NN */
114                }
115        }
116        return (res);
117}
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