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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 @@
+/* GNU Mailutils -- a suite of utilities for electronic mail
+ Copyright (C) 2011 Free Software Foundation, Inc.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 3 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General
+ Public License along with this library. If not, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <mailutils/sockaddr.h>
+
+static void
+set_next (struct mu_sockaddr *sp, struct mu_sockaddr *tgt)
+{
+ for (; sp->next; sp = sp->next)
+ ;
+ sp->next = tgt;
+ if (tgt)
+ tgt->prev = sp;
+}
+
+struct mu_sockaddr *
+mu_sockaddr_insert (struct mu_sockaddr *anchor, struct mu_sockaddr *addr,
+ int before)
+{
+ struct mu_sockaddr *ret = anchor;
+
+ if (!anchor)
+ {
+ addr->prev = NULL;
+ set_next (addr, NULL);
+ return addr;
+ }
+
+ if (before)
+ {
+ if (anchor->prev)
+ anchor = anchor->prev;
+ else
+ {
+ addr->prev = NULL;
+ set_next (addr, anchor);
+ return addr;
+ }
+ }
+
+ set_next (addr, anchor->next);
+ anchor->next = addr;
+ addr->prev = anchor;
+ return ret;
+}

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