1 /* $DragonFly: src/lib/libutil/trimdomain.c,v 1.2 2005/03/04 05:31:11 cpressey Exp $ */
3 * Copyright (c) 2001 Brian Somers <brian@Awfulhak.org>
4 * Based on original work by Atsushi Murai <amurai@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * $FreeBSD: /repoman/r/ncvs/src/lib/libutil/trimdomain.c,v 1.5 2003/10/18 10:04:16 markm Exp $
31 #include <sys/cdefs.h>
32 #include <sys/param.h>
39 static int isDISP(const char *);
42 * Trim the current domain name from fullhost, but only if the result
43 * is less than or equal to hostsize in length.
45 * This function understands $DISPLAY type fullhosts.
49 * trimdomain("abcde.my.domain", 5) -> "abcde"
50 * trimdomain("abcde.my.domain", 4) -> "abcde.my.domain"
51 * trimdomain("abcde.my.domain:0.0", 9) -> "abcde:0.0"
52 * trimdomain("abcde.my.domain:0.0", 8) -> "abcde.my.domain:0.0"
55 trimdomain(char *fullhost
, int hostsize
)
59 static char domain
[MAXHOSTNAMELEN
];
64 /* XXX: Should we assume that our domain is this persistent ? */
66 if (gethostname(domain
, sizeof(domain
) - 1) == 0 &&
67 (s
= strchr(domain
, '.')) != NULL
)
68 memmove(domain
, s
+ 1, strlen(s
+ 1) + 1);
71 dlen
= strlen(domain
);
74 if (domain
[0] == '\0')
78 end
= s
+ hostsize
+ 1;
79 for (; (s
= memchr(s
, '.', (size_t)(end
- s
))) != NULL
; s
++) {
80 if (strncasecmp(s
+ 1, domain
, dlen
) == 0) {
81 if (s
[dlen
+ 1] == '\0') {
82 /* Found -- lose the domain. */
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);
97 * Is the given string NN or NN.NN where ``NN'' is an all-numeric string ?
100 isDISP(const char *disp
)
105 w
= strspn(disp
, "0123456789");
110 else if (disp
[w
] == '.') {
112 w
= strspn(disp
, "0123456789");
113 if (w
> 0 && disp
[w
] == '\0')