added insque and remque

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27422 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/libroot/posix/glibc/misc/Jamfile

@@ -14,6 +14,7 @@ SubDirCcFlags -D_GNU_SOURCE -DUSE_IN_LIBIO ;
 
 MergeObject posix_gnu_misc.o :
 	dirname.c
+	insremque.c
 	tsearch.c
 	efgcvt.c
 	efgcvt_r.c

src/system/libroot/posix/glibc/misc/insremque.c

@@ -0,0 +1,46 @@
+/* Copyright (C) 1992, 1995, 1996 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C 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 2.1 of the License, or (at your option) any later version.
+
+   The GNU C 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 the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <stddef.h>
+#include <search.h>
+
+/* Insert ELEM into a doubly-linked list, after PREV.  */
+
+void
+insque (void *elem, void *prev)
+{
+  struct qelem *next = ((struct qelem *) prev)->q_forw;
+  ((struct qelem *) prev)->q_forw = (struct qelem *) elem;
+  if (next != NULL)
+    next->q_back = (struct qelem *) elem;
+  ((struct qelem *) elem)->q_forw = next;
+  ((struct qelem *) elem)->q_back = (struct qelem *) prev;
+}
+
+/* Unlink ELEM from the doubly-linked list that it is in.  */
+
+void
+remque (void *elem)
+{
+  struct qelem *next = ((struct qelem *) elem)->q_forw;
+  struct qelem *prev = ((struct qelem *) elem)->q_back;
+  if (next != NULL)
+    next->q_back = prev;
+  if (prev != NULL)
+    prev->q_forw = (struct qelem *) next;
+}