xnu-3247.1.106.tar.gz

[apple/xnu.git] / bsd / hfs / rangelist.h

diff --git a/bsd/hfs/rangelist.h b/bsd/hfs/rangelist.h
index 8b55318c4e8450c2b4d9dec2ecdb8daee5cbd213..41708be5da34055d6faed119889fc5692278e134 100644 (file)
--- a/bsd/hfs/rangelist.h
+++ b/bsd/hfs/rangelist.h
@@ -1,16 +1,19 @@
 /*
- * Copyright (c) 2001 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2001-2014 Apple Computer, Inc. All rights reserved.
  *
- * @APPLE_LICENSE_HEADER_START@
- * 
- * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
  * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ * 
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
  * 
  * The Original Code and all software distributed under the License are
  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
@@ -20,7 +23,7 @@
  * Please see the License for the specific language governing rights and
  * limitations under the License.
  * 
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 #ifndef _HFS_RANGELIST_H_
 #define _HFS_RANGELIST_H_
@@ -41,12 +44,12 @@ enum rl_overlaptype {
     RL_OVERLAPENDSAFTER                /* 5 */
 };
 
-#define RL_INFINITY ((off_t)-1)
+#define RL_INFINITY INT64_MAX
 
-CIRCLEQ_HEAD(rl_head, rl_entry);
+TAILQ_HEAD(rl_head, rl_entry);
 
 struct rl_entry {
-    CIRCLEQ_ENTRY(rl_entry) rl_link;
+    TAILQ_ENTRY(rl_entry) rl_link;
     off_t rl_start;
     off_t rl_end;
 };
@@ -55,10 +58,27 @@ __BEGIN_DECLS
 void rl_init(struct rl_head *rangelist);
 void rl_add(off_t start, off_t end, struct rl_head *rangelist);
 void rl_remove(off_t start, off_t end, struct rl_head *rangelist);
+void rl_remove_all(struct rl_head *rangelist);
 enum rl_overlaptype rl_scan(struct rl_head *rangelist,
                                                        off_t start,
                                                        off_t end,
                                                        struct rl_entry **overlap);
+enum rl_overlaptype rl_overlap(const struct rl_entry *range, 
+                                                          off_t start, off_t end);
+
+static __attribute__((pure)) inline
+off_t rl_len(const struct rl_entry *range)
+{
+       return range->rl_end - range->rl_start + 1;
+}
+
+void rl_subtract(struct rl_entry *a, const struct rl_entry *b);
+
+static inline struct rl_entry rl_make(off_t start, off_t end)
+{
+       return (struct rl_entry){ .rl_start = start, .rl_end = end };
+}
+
 __END_DECLS
 
 #endif /* __APPLE_API_PRIVATE */