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authorJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
committerJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
commit0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (patch)
tree2ea1f8305970753e4a657acb2ccc15ca3eec8e2c /misc/insremque.c
parent7d58530341304d403a6626d7f7a1913165fe2f32 (diff)
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2.5-18.1
Diffstat (limited to 'misc/insremque.c')
-rw-r--r--misc/insremque.c22
1 files changed, 15 insertions, 7 deletions
diff --git a/misc/insremque.c b/misc/insremque.c
index e366ac8063..7f086cd392 100644
--- a/misc/insremque.c
+++ b/misc/insremque.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1992, 1995, 1996 Free Software Foundation, Inc.
+/* Copyright (C) 1992, 1995, 1996, 2006 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
@@ -24,12 +24,20 @@
 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;
+  if (prev == NULL)
+    {
+      ((struct qelem *) elem)->q_forw = NULL;
+      ((struct qelem *) elem)->q_back = NULL;
+    }
+  else
+    {
+      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.  */