Merge remote-tracking branch 'origin/cmaster-next' into vtysh-grammar

1 files changed, 62 insertions, 0 deletions

diff --git a/lib/fifo.h b/lib/fifo.h
new file mode 100644
index 0000000000..6be75b7611
--- /dev/null
+++ b/lib/fifo.h
@@ -0,0 +1,62 @@
+/* FIFO common header.
+   Copyright (C) 2015 Kunihiro Ishiguro
+
+This file is part of Quagga.
+
+Quagga 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 2, or (at your option) any
+later version.
+
+Quagga 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 GNU Zebra; see the file COPYING.  If not, write to the Free
+Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA.  */
+#ifndef __LIB_FIFO_H__
+#define __LIB_FIFO_H__
+
+/* FIFO -- first in first out structure and macros.  */
+struct fifo
+{
+  struct fifo *next;
+  struct fifo *prev;
+};
+
+#define FIFO_INIT(F)                                  \
+  do {                                                \
+    struct fifo *Xfifo = (struct fifo *)(F);          \
+    Xfifo->next = Xfifo->prev = Xfifo;                \
+  } while (0)
+
+#define FIFO_ADD(F,N)                                 \
+  do {                                                \
+    struct fifo *Xfifo = (struct fifo *)(F);          \
+    struct fifo *Xnode = (struct fifo *)(N);          \
+    Xnode->next = Xfifo;                              \
+    Xnode->prev = Xfifo->prev;                        \
+    Xfifo->prev = Xfifo->prev->next = Xnode;          \
+  } while (0)
+
+#define FIFO_DEL(N)                                   \
+  do {                                                \
+    struct fifo *Xnode = (struct fifo *)(N);          \
+    Xnode->prev->next = Xnode->next;                  \
+    Xnode->next->prev = Xnode->prev;                  \
+  } while (0)
+
+#define FIFO_HEAD(F)                                  \
+  ((((struct fifo *)(F))->next == (struct fifo *)(F)) \
+  ? NULL : (F)->next)
+
+#define FIFO_EMPTY(F)                                 \
+  (((struct fifo *)(F))->next == (struct fifo *)(F))
+
+#define FIFO_TOP(F)                                   \
+  (FIFO_EMPTY(F) ? NULL : ((struct fifo *)(F))->next)
+
+#endif /* __LIB_FIFO_H__ */