contrib/bind-9.2.4rc7/lib/isc/include/isc/region.h

   1 /*
   2  * Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 1998-2001  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15  * PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /* $Id: region.h,v 1.16.2.1 2004/03/09 06:12:00 marka Exp $ */
  19
  20 #ifndef ISC_REGION_H
  21 #define ISC_REGION_H 1
  22
  23 #include <isc/types.h>
  24
  25 struct isc_region {
  26         unsigned char * base;
  27         unsigned int    length;
  28 };
  29
  30 struct isc_textregion {
  31         char *          base;
  32         unsigned int    length;
  33 };
  34
  35 /* XXXDCL questionable ... bears discussion.  we have been putting off
  36  * discussing the region api.
  37  */
  38 struct isc_constregion {
  39         const void *    base;
  40         unsigned int    length;
  41 };
  42
  43 struct isc_consttextregion {
  44         const char *    base;
  45         unsigned int    length;
  46 };
  47
  48 /*
  49  * The region structure is not opaque, and is usually directly manipulated.
  50  * Some macros are defined below for convenience.
  51  */
  52
  53 #define isc_region_consume(r,l) \
  54         do { \
  55                 isc_region_t *_r = (r); \
  56                 unsigned int _l = (l); \
  57                 INSIST(_r->length >= _l); \
  58                 _r->base += _l; \
  59                 _r->length -= _l; \
  60         } while (0)
  61
  62 #define isc_textregion_consume(r,l) \
  63         do { \
  64                 isc_textregion_t *_r = (r); \
  65                 unsigned int _l = (l); \
  66                 INSIST(_r->length >= _l); \
  67                 _r->base += _l; \
  68                 _r->length -= _l; \
  69         } while (0)
  70
  71 #define isc_constregion_consume(r,l) \
  72         do { \
  73                 isc_constregion_t *_r = (r); \
  74                 unsigned int _l = (l); \
  75                 INSIST(_r->length >= _l); \
  76                 _r->base += _l; \
  77                 _r->length -= _l; \
  78         } while (0)
  79
  80 #endif /* ISC_REGION_H */