bsd/hfs/rangelist.h

   1 /*
   2  * Copyright (c) 2001 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22
  23 #include <sys/types.h>
  24 #include <sys/queue.h>
  25
  26 enum rl_overlaptype {
  27     RL_NOOVERLAP = 0,           /* 0 */
  28     RL_MATCHINGOVERLAP,         /* 1 */
  29     RL_OVERLAPCONTAINSRANGE,    /* 2 */
  30     RL_OVERLAPISCONTAINED,      /* 3 */
  31     RL_OVERLAPSTARTSBEFORE,     /* 4 */
  32     RL_OVERLAPENDSAFTER         /* 5 */
  33 };
  34
  35 #define RL_INFINITY ((off_t)-1)
  36
  37 CIRCLEQ_HEAD(rl_head, rl_entry);
  38
  39 struct rl_entry {
  40     CIRCLEQ_ENTRY(rl_entry) rl_link;
  41     off_t rl_start;
  42     off_t rl_end;
  43 };
  44
  45 __BEGIN_DECLS
  46 void rl_init(struct rl_head *rangelist);
  47 void rl_add(off_t start, off_t end, struct rl_head *rangelist);
  48 void rl_remove(off_t start, off_t end, struct rl_head *rangelist);
  49 enum rl_overlaptype rl_scan(struct rl_head *rangelist,
  50                                                         off_t start,
  51                                                         off_t end,
  52                                                         struct rl_entry **overlap);
  53 __END_DECLS