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-rw-r--r--libc/misc/search/insremque.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/libc/misc/search/insremque.c b/libc/misc/search/insremque.c
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+++ b/libc/misc/search/insremque.c
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+/* 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 <features.h>
+#define __USE_GNU
+#include <stddef.h>
+#ifndef _SVID_SOURCE
+#define _SVID_SOURCE 1
+#endif
+#include <search.h>
+
+#ifdef L_insque
+
+/* 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;
+}
+
+#endif
+
+#ifdef L_remque
+/* 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;
+}
+
+#endif