Inital commit

lib/clicon/clicon_queue.h

@@ -0,0 +1,89 @@
+/*
+ *
+  Copyright (C) 2009-2016 Olof Hagsand and Benny Holmgren
+
+  This file is part of CLICON.
+
+  CLICON is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 3 of the License, or
+  (at your option) any later version.
+
+  CLICON 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 General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with CLICON; see the file COPYING.  If not, see
+  <http://www.gnu.org/licenses/>.
+
+ *
+ * Copyright (C) 2002 Benny Holmgren, All rights reserved
+ */
+
+#ifndef _CLICON_QUEUE_H_
+#define _CLICON_QUEUE_H_
+
+/*
+ * Circular queue structure for use as first entry in a parent structure.
+ */
+typedef struct _qelem_t {
+	struct _qelem_t  *q_next;
+	struct _qelem_t  *q_prev;
+} qelem_t;
+
+  /*
+  * Append element 'elem' to queue.
+  */
+#define ADDQ(elem, pred) { \
+	register qelem_t *Xe = (qelem_t *) (elem);	\
+	register qelem_t *Xp = (qelem_t *) (pred);	\
+	if (pred) {					\
+	    Xe->q_next = Xp;				\
+	    Xe->q_prev = Xp->q_prev;			\
+	    Xp->q_prev->q_next = Xe;			\
+	    Xp->q_prev = Xe;				\
+	} else {					\
+	    Xe->q_next = Xe->q_prev = Xe;		\
+	    pred = elem;				\
+	}						\
+    }
+
+/*
+ * Insert element 'elem' in queue after 'pred'
+ */
+#define INSQ(elem, pred) { \
+		register qelem_t *Xe = (qelem_t *) (elem); \
+		register qelem_t *Xp = (qelem_t *) (pred); \
+		if (pred) {				   \
+		    Xe->q_next = Xp;			   \
+		    Xe->q_prev = Xp->q_prev;		   \
+		    Xp->q_prev->q_next = Xe;		   \
+		    Xp->q_prev = Xe;			   \
+		} else {				   \
+		    Xe->q_next = Xe->q_prev = Xe;	   \
+		}					   \
+		pred = elem;				   \
+    }
+
+/*
+ * Remove element 'elem' from queue. 'head' is the pointer to the queue and 
+ * is of 'type'.
+ */
+#define	DELQ(elem, head, type)	{ \
+    		register qelem_t *Xe = (qelem_t *) elem; \
+		if (Xe->q_next == Xe) \
+			head = NULL; \
+		(Xe->q_prev->q_next = Xe->q_next)->q_prev = Xe->q_prev; \
+		if (elem == head) \
+			head = (type)Xe->q_next; \
+	}
+	
+/*
+ * Get next entry in list
+ */
+#define NEXTQ(type, elem)	((type)((elem)?((qelem_t *)(elem))->q_next:NULL))
+
+
+#endif	/* _CLICON_QUEUE_H_ */