summaryrefslogtreecommitdiff
path: root/libiberty/insque.c
diff options
context:
space:
mode:
authorjason <jason@138bc75d-0d04-0410-961f-82ee72b054a4>1997-08-21 22:57:35 +0000
committerjason <jason@138bc75d-0d04-0410-961f-82ee72b054a4>1997-08-21 22:57:35 +0000
commit28e9041cc224267271fbcd8db22bea115912365b (patch)
treea3b19970338bdae580faff126a716e1d5520400c /libiberty/insque.c
parent5000a677980ebfb439f5349c5e269f7447dbab41 (diff)
downloadgcc-28e9041cc224267271fbcd8db22bea115912365b.tar.gz
Initial revision
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@14877 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'libiberty/insque.c')
-rw-r--r--libiberty/insque.c50
1 files changed, 50 insertions, 0 deletions
diff --git a/libiberty/insque.c b/libiberty/insque.c
new file mode 100644
index 00000000000..775019f8fff
--- /dev/null
+++ b/libiberty/insque.c
@@ -0,0 +1,50 @@
+/* insque(3C) routines
+ This file is in the public domain. */
+
+/*
+NAME
+ insque, remque -- insert, remove an element from a queue
+
+SYNOPSIS
+ struct qelem {
+ struct qelem *q_forw;
+ struct qelem *q_back;
+ char q_data[];
+ };
+
+ void insque (struct qelem *elem, struct qelem *pred)
+
+ void remque (struct qelem *elem)
+
+DESCRIPTION
+ Routines to manipulate queues built from doubly linked lists.
+ The insque routine inserts ELEM in the queue immediately after
+ PRED. The remque routine removes ELEM from its containing queue.
+*/
+
+
+struct qelem {
+ struct qelem *q_forw;
+ struct qelem *q_back;
+};
+
+
+void
+insque (elem, pred)
+ struct qelem *elem;
+ struct qelem *pred;
+{
+ elem -> q_forw = pred -> q_forw;
+ pred -> q_forw -> q_back = elem;
+ elem -> q_back = pred;
+ pred -> q_forw = elem;
+}
+
+
+void
+remque (elem)
+ struct qelem *elem;
+{
+ elem -> q_forw -> q_back = elem -> q_back;
+ elem -> q_back -> q_forw = elem -> q_forw;
+}