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-rw-r--r--libmailutils/sockaddr/insert.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/libmailutils/sockaddr/insert.c b/libmailutils/sockaddr/insert.c
new file mode 100644
index 000000000..dbac151c1
--- /dev/null
+++ b/libmailutils/sockaddr/insert.c
@@ -0,0 +1,64 @@
1/* GNU Mailutils -- a suite of utilities for electronic mail
2 Copyright (C) 2011 Free Software Foundation, Inc.
3
4 This library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 3 of the License, or (at your option) any later version.
8
9 This library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General
15 Public License along with this library. If not, see
16 <http://www.gnu.org/licenses/>. */
17
18#ifdef HAVE_CONFIG_H
19# include <config.h>
20#endif
21
22#include <stdlib.h>
23#include <mailutils/sockaddr.h>
24
25static void
26set_next (struct mu_sockaddr *sp, struct mu_sockaddr *tgt)
27{
28 for (; sp->next; sp = sp->next)
29 ;
30 sp->next = tgt;
31 if (tgt)
32 tgt->prev = sp;
33}
34
35struct mu_sockaddr *
36mu_sockaddr_insert (struct mu_sockaddr *anchor, struct mu_sockaddr *addr,
37 int before)
38{
39 struct mu_sockaddr *ret = anchor;
40
41 if (!anchor)
42 {
43 addr->prev = NULL;
44 set_next (addr, NULL);
45 return addr;
46 }
47
48 if (before)
49 {
50 if (anchor->prev)
51 anchor = anchor->prev;
52 else
53 {
54 addr->prev = NULL;
55 set_next (addr, anchor);
56 return addr;
57 }
58 }
59
60 set_next (addr, anchor->next);
61 anchor->next = addr;
62 addr->prev = anchor;
63 return ret;
64}

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