晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/include/bind9/isccc/util.h
/*
 * Portions 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.
 *
 * Portions Copyright (C) 2001 Nominum, Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND NOMINUM DISCLAIMS ALL
 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */


#ifndef ISCCC_UTIL_H
#define ISCCC_UTIL_H 1

#include <inttypes.h>

#include <isc/util.h>

/*! \file isccc/util.h
 * \brief
 * Macros for dealing with unaligned numbers.
 *
 * \note no side effects are allowed when invoking these macros!
 */

#define GET8(v, w) \
	do { \
		v = *w; \
		w++; \
	} while (0)

#define GET16(v, w) \
	do { \
		v = (unsigned int)w[0] << 8; \
		v |= (unsigned int)w[1]; \
		w += 2; \
	} while (0)

#define GET24(v, w) \
	do { \
		v = (unsigned int)w[0] << 16; \
		v |= (unsigned int)w[1] << 8; \
		v |= (unsigned int)w[2]; \
		w += 3; \
	} while (0)

#define GET32(v, w) \
	do { \
		v = (unsigned int)w[0] << 24; \
		v |= (unsigned int)w[1] << 16; \
		v |= (unsigned int)w[2] << 8; \
		v |= (unsigned int)w[3]; \
		w += 4; \
	} while (0)

#define GET64(v, w) \
	do { \
		v = (uint64_t)w[0] << 56; \
		v |= (uint64_t)w[1] << 48; \
		v |= (uint64_t)w[2] << 40; \
		v |= (uint64_t)w[3] << 32; \
		v |= (uint64_t)w[4] << 24; \
		v |= (uint64_t)w[5] << 16; \
		v |= (uint64_t)w[6] << 8; \
		v |= (uint64_t)w[7]; \
		w += 8; \
	} while (0)

#define GETC16(v, w, d) \
	do { \
		GET8(v, w); \
		if (v == 0) \
			d = ISCCC_TRUE; \
		else { \
			d = ISCCC_FALSE; \
			if (v == 255) \
				GET16(v, w); \
		} \
	} while (0)

#define GETC32(v, w) \
	do { \
		GET24(v, w); \
		if (v == 0xffffffu) \
			GET32(v, w); \
	} while (0)

#define GET_OFFSET(v, w)		GET32(v, w)

#define GET_MEM(v, c, w) \
	do { \
		memmove(v, w, c); \
		w += c; \
	} while (0)

#define GET_TYPE(v, w) \
	do { \
		GET8(v, w); \
		if (v > 127) { \
			if (v < 255) \
				v = ((v & 0x7f) << 16) | ISCCC_RDATATYPE_SIG; \
			else \
				GET32(v, w); \
		} \
	} while (0)

#define PUT8(v, w) \
	do { \
		*w = (v & 0x000000ffU); \
		w++; \
	} while (0)

#define PUT16(v, w) \
	do { \
		w[0] = (v & 0x0000ff00U) >> 8; \
		w[1] = (v & 0x000000ffU); \
		w += 2; \
	} while (0)

#define PUT24(v, w) \
	do { \
		w[0] = (v & 0x00ff0000U) >> 16; \
		w[1] = (v & 0x0000ff00U) >> 8; \
		w[2] = (v & 0x000000ffU); \
		w += 3; \
	} while (0)

#define PUT32(v, w) \
	do { \
		w[0] = (v & 0xff000000U) >> 24; \
		w[1] = (v & 0x00ff0000U) >> 16; \
		w[2] = (v & 0x0000ff00U) >> 8; \
		w[3] = (v & 0x000000ffU); \
		w += 4; \
	} while (0)

#define PUT64(v, w) \
	do { \
		w[0] = (v & 0xff00000000000000ULL) >> 56; \
		w[1] = (v & 0x00ff000000000000ULL) >> 48; \
		w[2] = (v & 0x0000ff0000000000ULL) >> 40; \
		w[3] = (v & 0x000000ff00000000ULL) >> 32; \
		w[4] = (v & 0x00000000ff000000ULL) >> 24; \
		w[5] = (v & 0x0000000000ff0000ULL) >> 16; \
		w[6] = (v & 0x000000000000ff00ULL) >> 8; \
		w[7] = (v & 0x00000000000000ffULL); \
		w += 8; \
	} while (0)

#define PUTC16(v, w) \
	do { \
		if (v > 0 && v < 255) \
			PUT8(v, w); \
		else { \
			PUT8(255, w); \
			PUT16(v, w); \
		} \
	} while (0)

#define PUTC32(v, w) \
	do { \
		if (v < 0xffffffU) \
			PUT24(v, w); \
		else { \
			PUT24(0xffffffU, w); \
			PUT32(v, w); \
		} \
	} while (0)

#define PUT_OFFSET(v, w)		PUT32(v, w)

#include <string.h>

#define PUT_MEM(s, c, w) \
	do { \
		memmove(w, s, c); \
		w += c; \
	} while (0)

/*
 * Regions.
 */
#define REGION_SIZE(r)		((unsigned int)((r).rend - (r).rstart))
#define REGION_EMPTY(r)		((r).rstart == (r).rend)
#define REGION_FROMSTRING(r, s) do { \
	(r).rstart = (unsigned char *)s; \
	(r).rend = (r).rstart + strlen(s); \
} while (0)

/*%
 * Use this to remove the const qualifier of a variable to assign it to
 * a non-const variable or pass it as a non-const function argument ...
 * but only when you are sure it won't then be changed!
 * This is necessary to sometimes shut up some compilers
 * (as with gcc -Wcast-qual) when there is just no other good way to avoid the
 * situation.
 */
#define DE_CONST(konst, var) \
	do { \
		union { const void *k; void *v; } _u; \
		_u.k = konst; \
		var = _u.v; \
	} while (0)

#endif /* ISCCC_UTIL_H */

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