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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#ifndef ISC_REGION_H
#define ISC_REGION_H 1
/*! \file isc/region.h */
#include <isc/types.h>
#include <isc/lang.h>
struct isc_region {
unsigned char * base;
unsigned int length;
};
struct isc_textregion {
char * base;
unsigned int length;
};
/* XXXDCL questionable ... bears discussion. we have been putting off
* discussing the region api.
*/
struct isc_constregion {
const void * base;
unsigned int length;
};
struct isc_consttextregion {
const char * base;
unsigned int length;
};
/*@{*/
/*!
* The region structure is not opaque, and is usually directly manipulated.
* Some macros are defined below for convenience.
*/
#define isc_region_consume(r,l) \
do { \
isc_region_t *_r = (r); \
unsigned int _l = (l); \
INSIST(_r->length >= _l); \
_r->base += _l; \
_r->length -= _l; \
} while (0)
#define isc_textregion_consume(r,l) \
do { \
isc_textregion_t *_r = (r); \
unsigned int _l = (l); \
INSIST(_r->length >= _l); \
_r->base += _l; \
_r->length -= _l; \
} while (0)
#define isc_constregion_consume(r,l) \
do { \
isc_constregion_t *_r = (r); \
unsigned int _l = (l); \
INSIST(_r->length >= _l); \
_r->base += _l; \
_r->length -= _l; \
} while (0)
/*@}*/
ISC_LANG_BEGINDECLS
int
isc_region_compare(isc_region_t *r1, isc_region_t *r2);
/*%<
* Compares the contents of two regions
*
* Requires:
*\li 'r1' is a valid region
*\li 'r2' is a valid region
*
* Returns:
*\li < 0 if r1 is lexicographically less than r2
*\li = 0 if r1 is lexicographically identical to r2
*\li > 0 if r1 is lexicographically greater than r2
*/
ISC_LANG_ENDDECLS
#endif /* ISC_REGION_H */