1 files changed, 48 insertions, 0 deletions
diff --git a/libc/misc/insremque/insremque.c b/libc/misc/insremque/insremque.c
new file mode 100644
index 000000000..6a0e4e133
--- /dev/null
+++ b/libc/misc/insremque/insremque.c
@@ -0,0 +1,48 @@
+/* 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <stddef.h>
+#define _GNU_SOURCE
+#define _SVID_SOURCE
+#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;
+}