/* * 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 https://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/lang.h> #include <isc/types.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 */