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