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COPYRIGHT AND PERMISSION NOTICE (ICU 58 and later)
Copyright © 1991-2019 Unicode, Inc. All rights reserved.
Distributed under the Terms of Use in https://www.unicode.org/copyright.html.
Permission is hereby granted, free of charge, to any person obtaining
a copy of the Unicode data files and any associated documentation
(the "Data Files") or Unicode software and any associated documentation
(the "Software") to deal in the Data Files or Software
without restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, and/or sell copies of
the Data Files or Software, and to permit persons to whom the Data Files
or Software are furnished to do so, provided that either
(a) this copyright and permission notice appear with all copies
of the Data Files or Software, or
(b) this copyright and permission notice appear in associated
Documentation.
THE DATA FILES AND SOFTWARE ARE PROVIDED "AS IS", WITHOUT WARRANTY OF
ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT OF THIRD PARTY RIGHTS.
IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN THIS
NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL 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 THE DATA FILES OR SOFTWARE.
Except as contained in this notice, the name of a copyright holder
shall not be used in advertising or otherwise to promote the sale,
use or other dealings in these Data Files or Software without prior
written authorization of the copyright holder.
---------------------
Third-Party Software Licenses
This section contains third-party software notices and/or additional
terms for licensed third-party software components included within ICU
libraries.
1. ICU License - ICU 1.8.1 to ICU 57.1
COPYRIGHT AND PERMISSION NOTICE
Copyright (c) 1995-2016 International Business Machines Corporation and others
All rights reserved.
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, and/or sell copies of the Software, and to permit persons
to whom the Software is furnished to do so, provided that the above
copyright notice(s) and this permission notice appear in all copies of
the Software and that both the above copyright notice(s) and this
permission notice appear in supporting documentation.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY
SPECIAL 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.
Except as contained in this notice, the name of a copyright holder
shall not be used in advertising or otherwise to promote the sale, use
or other dealings in this Software without prior written authorization
of the copyright holder.
All trademarks and registered trademarks mentioned herein are the
property of their respective owners.
2. Chinese/Japanese Word Break Dictionary Data (cjdict.txt)
# The Google Chrome software developed by Google is licensed under
# the BSD license. Other software included in this distribution is
# provided under other licenses, as set forth below.
#
# The BSD License
# http://opensource.org/licenses/bsd-license.php
# Copyright (C) 2006-2008, Google Inc.
#
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
# Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided with
# the distribution.
# Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
# CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
# INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
# BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
#
# The word list in cjdict.txt are generated by combining three word lists
# listed below with further processing for compound word breaking. The
# frequency is generated with an iterative training against Google web
# corpora.
#
# * Libtabe (Chinese)
# - https://sourceforge.net/project/?group_id=1519
# - Its license terms and conditions are shown below.
#
# * IPADIC (Japanese)
# - http://chasen.aist-nara.ac.jp/chasen/distribution.html
# - Its license terms and conditions are shown below.
#
# ---------COPYING.libtabe ---- BEGIN--------------------
#
# /*
# * Copyright (c) 1999 TaBE Project.
# * Copyright (c) 1999 Pai-Hsiang Hsiao.
# * All rights reserved.
# *
# * Redistribution and use in source and binary forms, with or without
# * modification, are permitted provided that the following conditions
# * are met:
# *
# * . Redistributions of source code must retain the above copyright
# * notice, this list of conditions and the following disclaimer.
# * . Redistributions in binary form must reproduce the above copyright
# * notice, this list of conditions and the following disclaimer in
# * the documentation and/or other materials provided with the
# * distribution.
# * . Neither the name of the TaBE Project nor the names of its
# * contributors may be used to endorse or promote products derived
# * from this software without specific prior written permission.
# *
# * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# * REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
# * OF THE POSSIBILITY OF SUCH DAMAGE.
# */
#
# /*
# * Copyright (c) 1999 Computer Systems and Communication Lab,
# * Institute of Information Science, Academia
# * Sinica. All rights reserved.
# *
# * Redistribution and use in source and binary forms, with or without
# * modification, are permitted provided that the following conditions
# * are met:
# *
# * . Redistributions of source code must retain the above copyright
# * notice, this list of conditions and the following disclaimer.
# * . Redistributions in binary form must reproduce the above copyright
# * notice, this list of conditions and the following disclaimer in
# * the documentation and/or other materials provided with the
# * distribution.
# * . Neither the name of the Computer Systems and Communication Lab
# * nor the names of its contributors may be used to endorse or
# * promote products derived from this software without specific
# * prior written permission.
# *
# * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# * REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
# * OF THE POSSIBILITY OF SUCH DAMAGE.
# */
#
# Copyright 1996 Chih-Hao Tsai @ Beckman Institute,
# University of Illinois
# c-tsai4@uiuc.edu http://casper.beckman.uiuc.edu/~c-tsai4
#
# ---------------COPYING.libtabe-----END--------------------------------
#
#
# ---------------COPYING.ipadic-----BEGIN-------------------------------
#
# Copyright 2000, 2001, 2002, 2003 Nara Institute of Science
# and Technology. All Rights Reserved.
#
# Use, reproduction, and distribution of this software is permitted.
# Any copy of this software, whether in its original form or modified,
# must include both the above copyright notice and the following
# paragraphs.
#
# Nara Institute of Science and Technology (NAIST),
# the copyright holders, disclaims all warranties with regard to this
# software, including all implied warranties of merchantability and
# fitness, in no event shall NAIST be liable for
# any special, 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 tortuous action, arising out
# of or in connection with the use or performance of this software.
#
# A large portion of the dictionary entries
# originate from ICOT Free Software. The following conditions for ICOT
# Free Software applies to the current dictionary as well.
#
# Each User may also freely distribute the Program, whether in its
# original form or modified, to any third party or parties, PROVIDED
# that the provisions of Section 3 ("NO WARRANTY") will ALWAYS appear
# on, or be attached to, the Program, which is distributed substantially
# in the same form as set out herein and that such intended
# distribution, if actually made, will neither violate or otherwise
# contravene any of the laws and regulations of the countries having
# jurisdiction over the User or the intended distribution itself.
#
# NO WARRANTY
#
# The program was produced on an experimental basis in the course of the
# research and development conducted during the project and is provided
# to users as so produced on an experimental basis. Accordingly, the
# program is provided without any warranty whatsoever, whether express,
# implied, statutory or otherwise. The term "warranty" used herein
# includes, but is not limited to, any warranty of the quality,
# performance, merchantability and fitness for a particular purpose of
# the program and the nonexistence of any infringement or violation of
# any right of any third party.
#
# Each user of the program will agree and understand, and be deemed to
# have agreed and understood, that there is no warranty whatsoever for
# the program and, accordingly, the entire risk arising from or
# otherwise connected with the program is assumed by the user.
#
# Therefore, neither ICOT, the copyright holder, or any other
# organization that participated in or was otherwise related to the
# development of the program and their respective officials, directors,
# officers and other employees shall be held liable for any and all
# damages, including, without limitation, general, special, incidental
# and consequential damages, arising out of or otherwise in connection
# with the use or inability to use the program or any product, material
# or result produced or otherwise obtained by using the program,
# regardless of whether they have been advised of, or otherwise had
# knowledge of, the possibility of such damages at any time during the
# project or thereafter. Each user will be deemed to have agreed to the
# foregoing by his or her commencement of use of the program. The term
# "use" as used herein includes, but is not limited to, the use,
# modification, copying and distribution of the program and the
# production of secondary products from the program.
#
# In the case where the program, whether in its original form or
# modified, was distributed or delivered to or received by a user from
# any person, organization or entity other than ICOT, unless it makes or
# grants independently of ICOT any specific warranty to the user in
# writing, such person, organization or entity, will also be exempted
# from and not be held liable to the user for any such damages as noted
# above as far as the program is concerned.
#
# ---------------COPYING.ipadic-----END----------------------------------
3. Lao Word Break Dictionary Data (laodict.txt)
# Copyright (c) 2013 International Business Machines Corporation
# and others. All Rights Reserved.
#
# Project: http://code.google.com/p/lao-dictionary/
# Dictionary: http://lao-dictionary.googlecode.com/git/Lao-Dictionary.txt
# License: http://lao-dictionary.googlecode.com/git/Lao-Dictionary-LICENSE.txt
# (copied below)
#
# This file is derived from the above dictionary, with slight
# modifications.
# ----------------------------------------------------------------------
# Copyright (C) 2013 Brian Eugene Wilson, Robert Martin Campbell.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification,
# are permitted provided that the following conditions are met:
#
#
# Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer. Redistributions in
# binary form must reproduce the above copyright notice, this list of
# conditions and the following disclaimer in the documentation and/or
# other materials provided with the distribution.
#
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
# OF THE POSSIBILITY OF SUCH DAMAGE.
# --------------------------------------------------------------------------
4. Burmese Word Break Dictionary Data (burmesedict.txt)
# Copyright (c) 2014 International Business Machines Corporation
# and others. All Rights Reserved.
#
# This list is part of a project hosted at:
# github.com/kanyawtech/myanmar-karen-word-lists
#
# --------------------------------------------------------------------------
# Copyright (c) 2013, LeRoy Benjamin Sharon
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met: Redistributions of source code must retain the above
# copyright notice, this list of conditions and the following
# disclaimer. Redistributions in binary form must reproduce the
# above copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided
# with the distribution.
#
# Neither the name Myanmar Karen Word Lists, nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
# CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
# INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
# TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
# TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
# THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
# --------------------------------------------------------------------------
5. Time Zone Database
ICU uses the public domain data and code derived from Time Zone
Database for its time zone support. The ownership of the TZ database
is explained in BCP 175: Procedure for Maintaining the Time Zone
Database section 7.
# 7. Database Ownership
#
# The TZ database itself is not an IETF Contribution or an IETF
# document. Rather it is a pre-existing and regularly updated work
# that is in the public domain, and is intended to remain in the
# public domain. Therefore, BCPs 78 [RFC5378] and 79 [RFC3979] do
# not apply to the TZ Database or contributions that individuals make
# to it. Should any claims be made and substantiated against the TZ
# Database, the organization that is providing the IANA
# Considerations defined in this RFC, under the memorandum of
# understanding with the IETF, currently ICANN, may act in accordance
# with all competent court orders. No ownership claims will be made
# by ICANN or the IETF Trust on the database or the code. Any person
# making a contribution to the database or code waives all rights to
# future claims in that contribution or in the TZ Database.
6. Google double-conversion
Copyright 2006-2011, the V8 project authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials provided
with the distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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# ICU Parts
This directory contains a small subset of files from the Unicode organization's [ICU repository](https://github.com/unicode-org/icu).
### License
The license for these files is contained in the `LICENSE` file within this directory.
### Contents
* Source files taken from the [`icu4c/source/common/unicode`](https://github.com/unicode-org/icu/tree/552b01f61127d30d6589aa4bf99468224979b661/icu4c/source/common/unicode) directory:
* `utf8.h`
* `utf16.h`
* `umachine.h`
* Empty source files that are referenced by the above source files, but whose original contents in `libicu` are not needed:
* `ptypes.h`
* `urename.h`
* `utf.h`
* `ICU_SHA` - File containing the Git SHA of the commit in the `icu` repository from which the files were obtained.
* `LICENSE` - The license file from the [`icu4c`](https://github.com/unicode-org/icu/tree/552b01f61127d30d6589aa4bf99468224979b661/icu4c) directory of the `icu` repository.
* `README.md` - This text file.
### Updating ICU
To incorporate changes from the upstream `icu` repository:
* Update `ICU_SHA` with the new Git SHA.
* Update `LICENSE` with the license text from the directory mentioned above.
* Update `utf8.h`, `utf16.h`, and `umachine.h` with their new contents in the `icu` repository.

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// This file must exist in order for `utf8.h` and `utf16.h` to be used.

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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
******************************************************************************
*
* Copyright (C) 1999-2015, International Business Machines
* Corporation and others. All Rights Reserved.
*
******************************************************************************
* file name: umachine.h
* encoding: UTF-8
* tab size: 8 (not used)
* indentation:4
*
* created on: 1999sep13
* created by: Markus W. Scherer
*
* This file defines basic types and constants for ICU to be
* platform-independent. umachine.h and utf.h are included into
* utypes.h to provide all the general definitions for ICU.
* All of these definitions used to be in utypes.h before
* the UTF-handling macros made this unmaintainable.
*/
#ifndef __UMACHINE_H__
#define __UMACHINE_H__
/**
* \file
* \brief Basic types and constants for UTF
*
* <h2> Basic types and constants for UTF </h2>
* This file defines basic types and constants for utf.h to be
* platform-independent. umachine.h and utf.h are included into
* utypes.h to provide all the general definitions for ICU.
* All of these definitions used to be in utypes.h before
* the UTF-handling macros made this unmaintainable.
*
*/
/*==========================================================================*/
/* Include platform-dependent definitions */
/* which are contained in the platform-specific file platform.h */
/*==========================================================================*/
#include "unicode/ptypes.h" /* platform.h is included in ptypes.h */
/*
* ANSI C headers:
* stddef.h defines wchar_t
*/
#include <stddef.h>
/*==========================================================================*/
/* For C wrappers, we use the symbol U_STABLE. */
/* This works properly if the includer is C or C++. */
/* Functions are declared U_STABLE return-type U_EXPORT2 function-name()... */
/*==========================================================================*/
/**
* \def U_CFUNC
* This is used in a declaration of a library private ICU C function.
* @stable ICU 2.4
*/
/**
* \def U_CDECL_BEGIN
* This is used to begin a declaration of a library private ICU C API.
* @stable ICU 2.4
*/
/**
* \def U_CDECL_END
* This is used to end a declaration of a library private ICU C API
* @stable ICU 2.4
*/
#ifdef __cplusplus
# define U_CFUNC extern "C"
# define U_CDECL_BEGIN extern "C" {
# define U_CDECL_END }
#else
# define U_CFUNC extern
# define U_CDECL_BEGIN
# define U_CDECL_END
#endif
#ifndef U_ATTRIBUTE_DEPRECATED
/**
* \def U_ATTRIBUTE_DEPRECATED
* This is used for GCC specific attributes
* @internal
*/
#if U_GCC_MAJOR_MINOR >= 302
# define U_ATTRIBUTE_DEPRECATED __attribute__ ((deprecated))
/**
* \def U_ATTRIBUTE_DEPRECATED
* This is used for Visual C++ specific attributes
* @internal
*/
#elif defined(_MSC_VER) && (_MSC_VER >= 1400)
# define U_ATTRIBUTE_DEPRECATED __declspec(deprecated)
#else
# define U_ATTRIBUTE_DEPRECATED
#endif
#endif
/** This is used to declare a function as a public ICU C API @stable ICU 2.0*/
#define U_CAPI U_CFUNC U_EXPORT
/** This is used to declare a function as a stable public ICU C API*/
#define U_STABLE U_CAPI
/** This is used to declare a function as a draft public ICU C API */
#define U_DRAFT U_CAPI
/** This is used to declare a function as a deprecated public ICU C API */
#define U_DEPRECATED U_CAPI U_ATTRIBUTE_DEPRECATED
/** This is used to declare a function as an obsolete public ICU C API */
#define U_OBSOLETE U_CAPI
/** This is used to declare a function as an internal ICU C API */
#define U_INTERNAL U_CAPI
/**
* \def U_OVERRIDE
* Defined to the C++11 "override" keyword if available.
* Denotes a class or member which is an override of the base class.
* May result in an error if it applied to something not an override.
* @internal
*/
#ifndef U_OVERRIDE
#define U_OVERRIDE override
#endif
/**
* \def U_FINAL
* Defined to the C++11 "final" keyword if available.
* Denotes a class or member which may not be overridden in subclasses.
* May result in an error if subclasses attempt to override.
* @internal
*/
#if !defined(U_FINAL) || defined(U_IN_DOXYGEN)
#define U_FINAL final
#endif
// Before ICU 65, function-like, multi-statement ICU macros were just defined as
// series of statements wrapped in { } blocks and the caller could choose to
// either treat them as if they were actual functions and end the invocation
// with a trailing ; creating an empty statement after the block or else omit
// this trailing ; using the knowledge that the macro would expand to { }.
//
// But doing so doesn't work well with macros that look like functions and
// compiler warnings about empty statements (ICU-20601) and ICU 65 therefore
// switches to the standard solution of wrapping such macros in do { } while.
//
// This will however break existing code that depends on being able to invoke
// these macros without a trailing ; so to be able to remain compatible with
// such code the wrapper is itself defined as macros so that it's possible to
// build ICU 65 and later with the old macro behaviour, like this:
//
// CPPFLAGS='-DUPRV_BLOCK_MACRO_BEGIN="" -DUPRV_BLOCK_MACRO_END=""'
// runConfigureICU ...
/**
* \def UPRV_BLOCK_MACRO_BEGIN
* Defined as the "do" keyword by default.
* @internal
*/
#ifndef UPRV_BLOCK_MACRO_BEGIN
#define UPRV_BLOCK_MACRO_BEGIN do
#endif
/**
* \def UPRV_BLOCK_MACRO_END
* Defined as "while (FALSE)" by default.
* @internal
*/
#ifndef UPRV_BLOCK_MACRO_END
#define UPRV_BLOCK_MACRO_END while (FALSE)
#endif
/*==========================================================================*/
/* limits for int32_t etc., like in POSIX inttypes.h */
/*==========================================================================*/
#ifndef INT8_MIN
/** The smallest value an 8 bit signed integer can hold @stable ICU 2.0 */
# define INT8_MIN ((int8_t)(-128))
#endif
#ifndef INT16_MIN
/** The smallest value a 16 bit signed integer can hold @stable ICU 2.0 */
# define INT16_MIN ((int16_t)(-32767-1))
#endif
#ifndef INT32_MIN
/** The smallest value a 32 bit signed integer can hold @stable ICU 2.0 */
# define INT32_MIN ((int32_t)(-2147483647-1))
#endif
#ifndef INT8_MAX
/** The largest value an 8 bit signed integer can hold @stable ICU 2.0 */
# define INT8_MAX ((int8_t)(127))
#endif
#ifndef INT16_MAX
/** The largest value a 16 bit signed integer can hold @stable ICU 2.0 */
# define INT16_MAX ((int16_t)(32767))
#endif
#ifndef INT32_MAX
/** The largest value a 32 bit signed integer can hold @stable ICU 2.0 */
# define INT32_MAX ((int32_t)(2147483647))
#endif
#ifndef UINT8_MAX
/** The largest value an 8 bit unsigned integer can hold @stable ICU 2.0 */
# define UINT8_MAX ((uint8_t)(255U))
#endif
#ifndef UINT16_MAX
/** The largest value a 16 bit unsigned integer can hold @stable ICU 2.0 */
# define UINT16_MAX ((uint16_t)(65535U))
#endif
#ifndef UINT32_MAX
/** The largest value a 32 bit unsigned integer can hold @stable ICU 2.0 */
# define UINT32_MAX ((uint32_t)(4294967295U))
#endif
#if defined(U_INT64_T_UNAVAILABLE)
# error int64_t is required for decimal format and rule-based number format.
#else
# ifndef INT64_C
/**
* Provides a platform independent way to specify a signed 64-bit integer constant.
* note: may be wrong for some 64 bit platforms - ensure your compiler provides INT64_C
* @stable ICU 2.8
*/
# define INT64_C(c) c ## LL
# endif
# ifndef UINT64_C
/**
* Provides a platform independent way to specify an unsigned 64-bit integer constant.
* note: may be wrong for some 64 bit platforms - ensure your compiler provides UINT64_C
* @stable ICU 2.8
*/
# define UINT64_C(c) c ## ULL
# endif
# ifndef U_INT64_MIN
/** The smallest value a 64 bit signed integer can hold @stable ICU 2.8 */
# define U_INT64_MIN ((int64_t)(INT64_C(-9223372036854775807)-1))
# endif
# ifndef U_INT64_MAX
/** The largest value a 64 bit signed integer can hold @stable ICU 2.8 */
# define U_INT64_MAX ((int64_t)(INT64_C(9223372036854775807)))
# endif
# ifndef U_UINT64_MAX
/** The largest value a 64 bit unsigned integer can hold @stable ICU 2.8 */
# define U_UINT64_MAX ((uint64_t)(UINT64_C(18446744073709551615)))
# endif
#endif
/*==========================================================================*/
/* Boolean data type */
/*==========================================================================*/
/** The ICU boolean type @stable ICU 2.0 */
typedef int8_t UBool;
#ifndef TRUE
/** The TRUE value of a UBool @stable ICU 2.0 */
# define TRUE 1
#endif
#ifndef FALSE
/** The FALSE value of a UBool @stable ICU 2.0 */
# define FALSE 0
#endif
/*==========================================================================*/
/* Unicode data types */
/*==========================================================================*/
/* wchar_t-related definitions -------------------------------------------- */
/*
* \def U_WCHAR_IS_UTF16
* Defined if wchar_t uses UTF-16.
*
* @stable ICU 2.0
*/
/*
* \def U_WCHAR_IS_UTF32
* Defined if wchar_t uses UTF-32.
*
* @stable ICU 2.0
*/
#if !defined(U_WCHAR_IS_UTF16) && !defined(U_WCHAR_IS_UTF32)
# ifdef __STDC_ISO_10646__
# if (U_SIZEOF_WCHAR_T==2)
# define U_WCHAR_IS_UTF16
# elif (U_SIZEOF_WCHAR_T==4)
# define U_WCHAR_IS_UTF32
# endif
# elif defined __UCS2__
# if (U_PF_OS390 <= U_PLATFORM && U_PLATFORM <= U_PF_OS400) && (U_SIZEOF_WCHAR_T==2)
# define U_WCHAR_IS_UTF16
# endif
# elif defined(__UCS4__) || (U_PLATFORM == U_PF_OS400 && defined(__UTF32__))
# if (U_SIZEOF_WCHAR_T==4)
# define U_WCHAR_IS_UTF32
# endif
# elif U_PLATFORM_IS_DARWIN_BASED || (U_SIZEOF_WCHAR_T==4 && U_PLATFORM_IS_LINUX_BASED)
# define U_WCHAR_IS_UTF32
# elif U_PLATFORM_HAS_WIN32_API
# define U_WCHAR_IS_UTF16
# endif
#endif
/* UChar and UChar32 definitions -------------------------------------------- */
/** Number of bytes in a UChar. @stable ICU 2.0 */
#define U_SIZEOF_UCHAR 2
/**
* \def U_CHAR16_IS_TYPEDEF
* If 1, then char16_t is a typedef and not a real type (yet)
* @internal
*/
#if (U_PLATFORM == U_PF_AIX) && defined(__cplusplus) &&(U_CPLUSPLUS_VERSION < 11)
// for AIX, uchar.h needs to be included
# include <uchar.h>
# define U_CHAR16_IS_TYPEDEF 1
#elif defined(_MSC_VER) && (_MSC_VER < 1900)
// Versions of Visual Studio/MSVC below 2015 do not support char16_t as a real type,
// and instead use a typedef. https://msdn.microsoft.com/library/bb531344.aspx
# define U_CHAR16_IS_TYPEDEF 1
#else
# define U_CHAR16_IS_TYPEDEF 0
#endif
/**
* \var UChar
*
* The base type for UTF-16 code units and pointers.
* Unsigned 16-bit integer.
* Starting with ICU 59, C++ API uses char16_t directly, while C API continues to use UChar.
*
* UChar is configurable by defining the macro UCHAR_TYPE
* on the preprocessor or compiler command line:
* -DUCHAR_TYPE=uint16_t or -DUCHAR_TYPE=wchar_t (if U_SIZEOF_WCHAR_T==2) etc.
* (The UCHAR_TYPE can also be \#defined earlier in this file, for outside the ICU library code.)
* This is for transitional use from application code that uses uint16_t or wchar_t for UTF-16.
*
* The default is UChar=char16_t.
*
* C++11 defines char16_t as bit-compatible with uint16_t, but as a distinct type.
*
* In C, char16_t is a simple typedef of uint_least16_t.
* ICU requires uint_least16_t=uint16_t for data memory mapping.
* On macOS, char16_t is not available because the uchar.h standard header is missing.
*
* @stable ICU 4.4
*/
#if 1
// #if 1 is normal. UChar defaults to char16_t in C++.
// For configuration testing of UChar=uint16_t temporarily change this to #if 0.
// The intltest Makefile #defines UCHAR_TYPE=char16_t,
// so we only #define it to uint16_t if it is undefined so far.
#elif !defined(UCHAR_TYPE)
# define UCHAR_TYPE uint16_t
#endif
#if defined(U_COMBINED_IMPLEMENTATION) || defined(U_COMMON_IMPLEMENTATION) || \
defined(U_I18N_IMPLEMENTATION) || defined(U_IO_IMPLEMENTATION)
// Inside the ICU library code, never configurable.
typedef char16_t UChar;
#elif defined(UCHAR_TYPE)
typedef UCHAR_TYPE UChar;
#elif defined(__cplusplus)
typedef char16_t UChar;
#else
typedef uint16_t UChar;
#endif
/**
* \var OldUChar
* Default ICU 58 definition of UChar.
* A base type for UTF-16 code units and pointers.
* Unsigned 16-bit integer.
*
* Define OldUChar to be wchar_t if that is 16 bits wide.
* If wchar_t is not 16 bits wide, then define UChar to be uint16_t.
*
* This makes the definition of OldUChar platform-dependent
* but allows direct string type compatibility with platforms with
* 16-bit wchar_t types.
*
* This is how UChar was defined in ICU 58, for transition convenience.
* Exception: ICU 58 UChar was defined to UCHAR_TYPE if that macro was defined.
* The current UChar responds to UCHAR_TYPE but OldUChar does not.
*
* @stable ICU 59
*/
#if U_SIZEOF_WCHAR_T==2
typedef wchar_t OldUChar;
#elif defined(__CHAR16_TYPE__)
typedef __CHAR16_TYPE__ OldUChar;
#else
typedef uint16_t OldUChar;
#endif
/**
* Define UChar32 as a type for single Unicode code points.
* UChar32 is a signed 32-bit integer (same as int32_t).
*
* The Unicode code point range is 0..0x10ffff.
* All other values (negative or >=0x110000) are illegal as Unicode code points.
* They may be used as sentinel values to indicate "done", "error"
* or similar non-code point conditions.
*
* Before ICU 2.4 (Jitterbug 2146), UChar32 was defined
* to be wchar_t if that is 32 bits wide (wchar_t may be signed or unsigned)
* or else to be uint32_t.
* That is, the definition of UChar32 was platform-dependent.
*
* @see U_SENTINEL
* @stable ICU 2.4
*/
typedef int32_t UChar32;
/**
* This value is intended for sentinel values for APIs that
* (take or) return single code points (UChar32).
* It is outside of the Unicode code point range 0..0x10ffff.
*
* For example, a "done" or "error" value in a new API
* could be indicated with U_SENTINEL.
*
* ICU APIs designed before ICU 2.4 usually define service-specific "done"
* values, mostly 0xffff.
* Those may need to be distinguished from
* actual U+ffff text contents by calling functions like
* CharacterIterator::hasNext() or UnicodeString::length().
*
* @return -1
* @see UChar32
* @stable ICU 2.4
*/
#define U_SENTINEL (-1)
#include "unicode/urename.h"
#endif

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// This file must exist in order for `utf8.h` and `utf16.h` to be used.

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// This file must exist in order for `utf8.h` and `utf16.h` to be used.

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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
*
* Copyright (C) 1999-2012, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
* file name: utf16.h
* encoding: UTF-8
* tab size: 8 (not used)
* indentation:4
*
* created on: 1999sep09
* created by: Markus W. Scherer
*/
/**
* \file
* \brief C API: 16-bit Unicode handling macros
*
* This file defines macros to deal with 16-bit Unicode (UTF-16) code units and strings.
*
* For more information see utf.h and the ICU User Guide Strings chapter
* (http://userguide.icu-project.org/strings).
*
* <em>Usage:</em>
* ICU coding guidelines for if() statements should be followed when using these macros.
* Compound statements (curly braces {}) must be used for if-else-while...
* bodies and all macro statements should be terminated with semicolon.
*/
#ifndef __UTF16_H__
#define __UTF16_H__
#include "unicode/umachine.h"
#ifndef __UTF_H__
# include "unicode/utf.h"
#endif
/* single-code point definitions -------------------------------------------- */
/**
* Does this code unit alone encode a code point (BMP, not a surrogate)?
* @param c 16-bit code unit
* @return TRUE or FALSE
* @stable ICU 2.4
*/
#define U16_IS_SINGLE(c) !U_IS_SURROGATE(c)
/**
* Is this code unit a lead surrogate (U+d800..U+dbff)?
* @param c 16-bit code unit
* @return TRUE or FALSE
* @stable ICU 2.4
*/
#define U16_IS_LEAD(c) (((c)&0xfffffc00)==0xd800)
/**
* Is this code unit a trail surrogate (U+dc00..U+dfff)?
* @param c 16-bit code unit
* @return TRUE or FALSE
* @stable ICU 2.4
*/
#define U16_IS_TRAIL(c) (((c)&0xfffffc00)==0xdc00)
/**
* Is this code unit a surrogate (U+d800..U+dfff)?
* @param c 16-bit code unit
* @return TRUE or FALSE
* @stable ICU 2.4
*/
#define U16_IS_SURROGATE(c) U_IS_SURROGATE(c)
/**
* Assuming c is a surrogate code point (U16_IS_SURROGATE(c)),
* is it a lead surrogate?
* @param c 16-bit code unit
* @return TRUE or FALSE
* @stable ICU 2.4
*/
#define U16_IS_SURROGATE_LEAD(c) (((c)&0x400)==0)
/**
* Assuming c is a surrogate code point (U16_IS_SURROGATE(c)),
* is it a trail surrogate?
* @param c 16-bit code unit
* @return TRUE or FALSE
* @stable ICU 4.2
*/
#define U16_IS_SURROGATE_TRAIL(c) (((c)&0x400)!=0)
/**
* Helper constant for U16_GET_SUPPLEMENTARY.
* @internal
*/
#define U16_SURROGATE_OFFSET ((0xd800<<10UL)+0xdc00-0x10000)
/**
* Get a supplementary code point value (U+10000..U+10ffff)
* from its lead and trail surrogates.
* The result is undefined if the input values are not
* lead and trail surrogates.
*
* @param lead lead surrogate (U+d800..U+dbff)
* @param trail trail surrogate (U+dc00..U+dfff)
* @return supplementary code point (U+10000..U+10ffff)
* @stable ICU 2.4
*/
#define U16_GET_SUPPLEMENTARY(lead, trail) \
(((UChar32)(lead)<<10UL)+(UChar32)(trail)-U16_SURROGATE_OFFSET)
/**
* Get the lead surrogate (0xd800..0xdbff) for a
* supplementary code point (0x10000..0x10ffff).
* @param supplementary 32-bit code point (U+10000..U+10ffff)
* @return lead surrogate (U+d800..U+dbff) for supplementary
* @stable ICU 2.4
*/
#define U16_LEAD(supplementary) (UChar)(((supplementary)>>10)+0xd7c0)
/**
* Get the trail surrogate (0xdc00..0xdfff) for a
* supplementary code point (0x10000..0x10ffff).
* @param supplementary 32-bit code point (U+10000..U+10ffff)
* @return trail surrogate (U+dc00..U+dfff) for supplementary
* @stable ICU 2.4
*/
#define U16_TRAIL(supplementary) (UChar)(((supplementary)&0x3ff)|0xdc00)
/**
* How many 16-bit code units are used to encode this Unicode code point? (1 or 2)
* The result is not defined if c is not a Unicode code point (U+0000..U+10ffff).
* @param c 32-bit code point
* @return 1 or 2
* @stable ICU 2.4
*/
#define U16_LENGTH(c) ((uint32_t)(c)<=0xffff ? 1 : 2)
/**
* The maximum number of 16-bit code units per Unicode code point (U+0000..U+10ffff).
* @return 2
* @stable ICU 2.4
*/
#define U16_MAX_LENGTH 2
/**
* Get a code point from a string at a random-access offset,
* without changing the offset.
* "Unsafe" macro, assumes well-formed UTF-16.
*
* The offset may point to either the lead or trail surrogate unit
* for a supplementary code point, in which case the macro will read
* the adjacent matching surrogate as well.
* The result is undefined if the offset points to a single, unpaired surrogate.
* Iteration through a string is more efficient with U16_NEXT_UNSAFE or U16_NEXT.
*
* @param s const UChar * string
* @param i string offset
* @param c output UChar32 variable
* @see U16_GET
* @stable ICU 2.4
*/
#define U16_GET_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \
(c)=(s)[i]; \
if(U16_IS_SURROGATE(c)) { \
if(U16_IS_SURROGATE_LEAD(c)) { \
(c)=U16_GET_SUPPLEMENTARY((c), (s)[(i)+1]); \
} else { \
(c)=U16_GET_SUPPLEMENTARY((s)[(i)-1], (c)); \
} \
} \
} UPRV_BLOCK_MACRO_END
/**
* Get a code point from a string at a random-access offset,
* without changing the offset.
* "Safe" macro, handles unpaired surrogates and checks for string boundaries.
*
* The offset may point to either the lead or trail surrogate unit
* for a supplementary code point, in which case the macro will read
* the adjacent matching surrogate as well.
*
* The length can be negative for a NUL-terminated string.
*
* If the offset points to a single, unpaired surrogate, then
* c is set to that unpaired surrogate.
* Iteration through a string is more efficient with U16_NEXT_UNSAFE or U16_NEXT.
*
* @param s const UChar * string
* @param start starting string offset (usually 0)
* @param i string offset, must be start<=i<length
* @param length string length
* @param c output UChar32 variable
* @see U16_GET_UNSAFE
* @stable ICU 2.4
*/
#define U16_GET(s, start, i, length, c) UPRV_BLOCK_MACRO_BEGIN { \
(c)=(s)[i]; \
if(U16_IS_SURROGATE(c)) { \
uint16_t __c2; \
if(U16_IS_SURROGATE_LEAD(c)) { \
if((i)+1!=(length) && U16_IS_TRAIL(__c2=(s)[(i)+1])) { \
(c)=U16_GET_SUPPLEMENTARY((c), __c2); \
} \
} else { \
if((i)>(start) && U16_IS_LEAD(__c2=(s)[(i)-1])) { \
(c)=U16_GET_SUPPLEMENTARY(__c2, (c)); \
} \
} \
} \
} UPRV_BLOCK_MACRO_END
/**
* Get a code point from a string at a random-access offset,
* without changing the offset.
* "Safe" macro, handles unpaired surrogates and checks for string boundaries.
*
* The offset may point to either the lead or trail surrogate unit
* for a supplementary code point, in which case the macro will read
* the adjacent matching surrogate as well.
*
* The length can be negative for a NUL-terminated string.
*
* If the offset points to a single, unpaired surrogate, then
* c is set to U+FFFD.
* Iteration through a string is more efficient with U16_NEXT_UNSAFE or U16_NEXT_OR_FFFD.
*
* @param s const UChar * string
* @param start starting string offset (usually 0)
* @param i string offset, must be start<=i<length
* @param length string length
* @param c output UChar32 variable
* @see U16_GET_UNSAFE
* @stable ICU 60
*/
#define U16_GET_OR_FFFD(s, start, i, length, c) UPRV_BLOCK_MACRO_BEGIN { \
(c)=(s)[i]; \
if(U16_IS_SURROGATE(c)) { \
uint16_t __c2; \
if(U16_IS_SURROGATE_LEAD(c)) { \
if((i)+1!=(length) && U16_IS_TRAIL(__c2=(s)[(i)+1])) { \
(c)=U16_GET_SUPPLEMENTARY((c), __c2); \
} else { \
(c)=0xfffd; \
} \
} else { \
if((i)>(start) && U16_IS_LEAD(__c2=(s)[(i)-1])) { \
(c)=U16_GET_SUPPLEMENTARY(__c2, (c)); \
} else { \
(c)=0xfffd; \
} \
} \
} \
} UPRV_BLOCK_MACRO_END
/* definitions with forward iteration --------------------------------------- */
/**
* Get a code point from a string at a code point boundary offset,
* and advance the offset to the next code point boundary.
* (Post-incrementing forward iteration.)
* "Unsafe" macro, assumes well-formed UTF-16.
*
* The offset may point to the lead surrogate unit
* for a supplementary code point, in which case the macro will read
* the following trail surrogate as well.
* If the offset points to a trail surrogate, then that itself
* will be returned as the code point.
* The result is undefined if the offset points to a single, unpaired lead surrogate.
*
* @param s const UChar * string
* @param i string offset
* @param c output UChar32 variable
* @see U16_NEXT
* @stable ICU 2.4
*/
#define U16_NEXT_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \
(c)=(s)[(i)++]; \
if(U16_IS_LEAD(c)) { \
(c)=U16_GET_SUPPLEMENTARY((c), (s)[(i)++]); \
} \
} UPRV_BLOCK_MACRO_END
/**
* Get a code point from a string at a code point boundary offset,
* and advance the offset to the next code point boundary.
* (Post-incrementing forward iteration.)
* "Safe" macro, handles unpaired surrogates and checks for string boundaries.
*
* The length can be negative for a NUL-terminated string.
*
* The offset may point to the lead surrogate unit
* for a supplementary code point, in which case the macro will read
* the following trail surrogate as well.
* If the offset points to a trail surrogate or
* to a single, unpaired lead surrogate, then c is set to that unpaired surrogate.
*
* @param s const UChar * string
* @param i string offset, must be i<length
* @param length string length
* @param c output UChar32 variable
* @see U16_NEXT_UNSAFE
* @stable ICU 2.4
*/
#define U16_NEXT(s, i, length, c) UPRV_BLOCK_MACRO_BEGIN { \
(c)=(s)[(i)++]; \
if(U16_IS_LEAD(c)) { \
uint16_t __c2; \
if((i)!=(length) && U16_IS_TRAIL(__c2=(s)[(i)])) { \
++(i); \
(c)=U16_GET_SUPPLEMENTARY((c), __c2); \
} \
} \
} UPRV_BLOCK_MACRO_END
/**
* Get a code point from a string at a code point boundary offset,
* and advance the offset to the next code point boundary.
* (Post-incrementing forward iteration.)
* "Safe" macro, handles unpaired surrogates and checks for string boundaries.
*
* The length can be negative for a NUL-terminated string.
*
* The offset may point to the lead surrogate unit
* for a supplementary code point, in which case the macro will read
* the following trail surrogate as well.
* If the offset points to a trail surrogate or
* to a single, unpaired lead surrogate, then c is set to U+FFFD.
*
* @param s const UChar * string
* @param i string offset, must be i<length
* @param length string length
* @param c output UChar32 variable
* @see U16_NEXT_UNSAFE
* @stable ICU 60
*/
#define U16_NEXT_OR_FFFD(s, i, length, c) UPRV_BLOCK_MACRO_BEGIN { \
(c)=(s)[(i)++]; \
if(U16_IS_SURROGATE(c)) { \
uint16_t __c2; \
if(U16_IS_SURROGATE_LEAD(c) && (i)!=(length) && U16_IS_TRAIL(__c2=(s)[(i)])) { \
++(i); \
(c)=U16_GET_SUPPLEMENTARY((c), __c2); \
} else { \
(c)=0xfffd; \
} \
} \
} UPRV_BLOCK_MACRO_END
/**
* Append a code point to a string, overwriting 1 or 2 code units.
* The offset points to the current end of the string contents
* and is advanced (post-increment).
* "Unsafe" macro, assumes a valid code point and sufficient space in the string.
* Otherwise, the result is undefined.
*
* @param s const UChar * string buffer
* @param i string offset
* @param c code point to append
* @see U16_APPEND
* @stable ICU 2.4
*/
#define U16_APPEND_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \
if((uint32_t)(c)<=0xffff) { \
(s)[(i)++]=(uint16_t)(c); \
} else { \
(s)[(i)++]=(uint16_t)(((c)>>10)+0xd7c0); \
(s)[(i)++]=(uint16_t)(((c)&0x3ff)|0xdc00); \
} \
} UPRV_BLOCK_MACRO_END
/**
* Append a code point to a string, overwriting 1 or 2 code units.
* The offset points to the current end of the string contents
* and is advanced (post-increment).
* "Safe" macro, checks for a valid code point.
* If a surrogate pair is written, checks for sufficient space in the string.
* If the code point is not valid or a trail surrogate does not fit,
* then isError is set to TRUE.
*
* @param s const UChar * string buffer
* @param i string offset, must be i<capacity
* @param capacity size of the string buffer
* @param c code point to append
* @param isError output UBool set to TRUE if an error occurs, otherwise not modified
* @see U16_APPEND_UNSAFE
* @stable ICU 2.4
*/
#define U16_APPEND(s, i, capacity, c, isError) UPRV_BLOCK_MACRO_BEGIN { \
if((uint32_t)(c)<=0xffff) { \
(s)[(i)++]=(uint16_t)(c); \
} else if((uint32_t)(c)<=0x10ffff && (i)+1<(capacity)) { \
(s)[(i)++]=(uint16_t)(((c)>>10)+0xd7c0); \
(s)[(i)++]=(uint16_t)(((c)&0x3ff)|0xdc00); \
} else /* c>0x10ffff or not enough space */ { \
(isError)=TRUE; \
} \
} UPRV_BLOCK_MACRO_END
/**
* Advance the string offset from one code point boundary to the next.
* (Post-incrementing iteration.)
* "Unsafe" macro, assumes well-formed UTF-16.
*
* @param s const UChar * string
* @param i string offset
* @see U16_FWD_1
* @stable ICU 2.4
*/
#define U16_FWD_1_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \
if(U16_IS_LEAD((s)[(i)++])) { \
++(i); \
} \
} UPRV_BLOCK_MACRO_END
/**
* Advance the string offset from one code point boundary to the next.
* (Post-incrementing iteration.)
* "Safe" macro, handles unpaired surrogates and checks for string boundaries.
*
* The length can be negative for a NUL-terminated string.
*
* @param s const UChar * string
* @param i string offset, must be i<length
* @param length string length
* @see U16_FWD_1_UNSAFE
* @stable ICU 2.4
*/
#define U16_FWD_1(s, i, length) UPRV_BLOCK_MACRO_BEGIN { \
if(U16_IS_LEAD((s)[(i)++]) && (i)!=(length) && U16_IS_TRAIL((s)[i])) { \
++(i); \
} \
} UPRV_BLOCK_MACRO_END
/**
* Advance the string offset from one code point boundary to the n-th next one,
* i.e., move forward by n code points.
* (Post-incrementing iteration.)
* "Unsafe" macro, assumes well-formed UTF-16.
*
* @param s const UChar * string
* @param i string offset
* @param n number of code points to skip
* @see U16_FWD_N
* @stable ICU 2.4
*/
#define U16_FWD_N_UNSAFE(s, i, n) UPRV_BLOCK_MACRO_BEGIN { \
int32_t __N=(n); \
while(__N>0) { \
U16_FWD_1_UNSAFE(s, i); \
--__N; \
} \
} UPRV_BLOCK_MACRO_END
/**
* Advance the string offset from one code point boundary to the n-th next one,
* i.e., move forward by n code points.
* (Post-incrementing iteration.)
* "Safe" macro, handles unpaired surrogates and checks for string boundaries.
*
* The length can be negative for a NUL-terminated string.
*
* @param s const UChar * string
* @param i int32_t string offset, must be i<length
* @param length int32_t string length
* @param n number of code points to skip
* @see U16_FWD_N_UNSAFE
* @stable ICU 2.4
*/
#define U16_FWD_N(s, i, length, n) UPRV_BLOCK_MACRO_BEGIN { \
int32_t __N=(n); \
while(__N>0 && ((i)<(length) || ((length)<0 && (s)[i]!=0))) { \
U16_FWD_1(s, i, length); \
--__N; \
} \
} UPRV_BLOCK_MACRO_END
/**
* Adjust a random-access offset to a code point boundary
* at the start of a code point.
* If the offset points to the trail surrogate of a surrogate pair,
* then the offset is decremented.
* Otherwise, it is not modified.
* "Unsafe" macro, assumes well-formed UTF-16.
*
* @param s const UChar * string
* @param i string offset
* @see U16_SET_CP_START
* @stable ICU 2.4
*/
#define U16_SET_CP_START_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \
if(U16_IS_TRAIL((s)[i])) { \
--(i); \
} \
} UPRV_BLOCK_MACRO_END
/**
* Adjust a random-access offset to a code point boundary
* at the start of a code point.
* If the offset points to the trail surrogate of a surrogate pair,
* then the offset is decremented.
* Otherwise, it is not modified.
* "Safe" macro, handles unpaired surrogates and checks for string boundaries.
*
* @param s const UChar * string
* @param start starting string offset (usually 0)
* @param i string offset, must be start<=i
* @see U16_SET_CP_START_UNSAFE
* @stable ICU 2.4
*/
#define U16_SET_CP_START(s, start, i) UPRV_BLOCK_MACRO_BEGIN { \
if(U16_IS_TRAIL((s)[i]) && (i)>(start) && U16_IS_LEAD((s)[(i)-1])) { \
--(i); \
} \
} UPRV_BLOCK_MACRO_END
/* definitions with backward iteration -------------------------------------- */
/**
* Move the string offset from one code point boundary to the previous one
* and get the code point between them.
* (Pre-decrementing backward iteration.)
* "Unsafe" macro, assumes well-formed UTF-16.
*
* The input offset may be the same as the string length.
* If the offset is behind a trail surrogate unit
* for a supplementary code point, then the macro will read
* the preceding lead surrogate as well.
* If the offset is behind a lead surrogate, then that itself
* will be returned as the code point.
* The result is undefined if the offset is behind a single, unpaired trail surrogate.
*
* @param s const UChar * string
* @param i string offset
* @param c output UChar32 variable
* @see U16_PREV
* @stable ICU 2.4
*/
#define U16_PREV_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \
(c)=(s)[--(i)]; \
if(U16_IS_TRAIL(c)) { \
(c)=U16_GET_SUPPLEMENTARY((s)[--(i)], (c)); \
} \
} UPRV_BLOCK_MACRO_END
/**
* Move the string offset from one code point boundary to the previous one
* and get the code point between them.
* (Pre-decrementing backward iteration.)
* "Safe" macro, handles unpaired surrogates and checks for string boundaries.
*
* The input offset may be the same as the string length.
* If the offset is behind a trail surrogate unit
* for a supplementary code point, then the macro will read
* the preceding lead surrogate as well.
* If the offset is behind a lead surrogate or behind a single, unpaired
* trail surrogate, then c is set to that unpaired surrogate.
*
* @param s const UChar * string
* @param start starting string offset (usually 0)
* @param i string offset, must be start<i
* @param c output UChar32 variable
* @see U16_PREV_UNSAFE
* @stable ICU 2.4
*/
#define U16_PREV(s, start, i, c) UPRV_BLOCK_MACRO_BEGIN { \
(c)=(s)[--(i)]; \
if(U16_IS_TRAIL(c)) { \
uint16_t __c2; \
if((i)>(start) && U16_IS_LEAD(__c2=(s)[(i)-1])) { \
--(i); \
(c)=U16_GET_SUPPLEMENTARY(__c2, (c)); \
} \
} \
} UPRV_BLOCK_MACRO_END
/**
* Move the string offset from one code point boundary to the previous one
* and get the code point between them.
* (Pre-decrementing backward iteration.)
* "Safe" macro, handles unpaired surrogates and checks for string boundaries.
*
* The input offset may be the same as the string length.
* If the offset is behind a trail surrogate unit
* for a supplementary code point, then the macro will read
* the preceding lead surrogate as well.
* If the offset is behind a lead surrogate or behind a single, unpaired
* trail surrogate, then c is set to U+FFFD.
*
* @param s const UChar * string
* @param start starting string offset (usually 0)
* @param i string offset, must be start<i
* @param c output UChar32 variable
* @see U16_PREV_UNSAFE
* @stable ICU 60
*/
#define U16_PREV_OR_FFFD(s, start, i, c) UPRV_BLOCK_MACRO_BEGIN { \
(c)=(s)[--(i)]; \
if(U16_IS_SURROGATE(c)) { \
uint16_t __c2; \
if(U16_IS_SURROGATE_TRAIL(c) && (i)>(start) && U16_IS_LEAD(__c2=(s)[(i)-1])) { \
--(i); \
(c)=U16_GET_SUPPLEMENTARY(__c2, (c)); \
} else { \
(c)=0xfffd; \
} \
} \
} UPRV_BLOCK_MACRO_END
/**
* Move the string offset from one code point boundary to the previous one.
* (Pre-decrementing backward iteration.)
* The input offset may be the same as the string length.
* "Unsafe" macro, assumes well-formed UTF-16.
*
* @param s const UChar * string
* @param i string offset
* @see U16_BACK_1
* @stable ICU 2.4
*/
#define U16_BACK_1_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \
if(U16_IS_TRAIL((s)[--(i)])) { \
--(i); \
} \
} UPRV_BLOCK_MACRO_END
/**
* Move the string offset from one code point boundary to the previous one.
* (Pre-decrementing backward iteration.)
* The input offset may be the same as the string length.
* "Safe" macro, handles unpaired surrogates and checks for string boundaries.
*
* @param s const UChar * string
* @param start starting string offset (usually 0)
* @param i string offset, must be start<i
* @see U16_BACK_1_UNSAFE
* @stable ICU 2.4
*/
#define U16_BACK_1(s, start, i) UPRV_BLOCK_MACRO_BEGIN { \
if(U16_IS_TRAIL((s)[--(i)]) && (i)>(start) && U16_IS_LEAD((s)[(i)-1])) { \
--(i); \
} \
} UPRV_BLOCK_MACRO_END
/**
* Move the string offset from one code point boundary to the n-th one before it,
* i.e., move backward by n code points.
* (Pre-decrementing backward iteration.)
* The input offset may be the same as the string length.
* "Unsafe" macro, assumes well-formed UTF-16.
*
* @param s const UChar * string
* @param i string offset
* @param n number of code points to skip
* @see U16_BACK_N
* @stable ICU 2.4
*/
#define U16_BACK_N_UNSAFE(s, i, n) UPRV_BLOCK_MACRO_BEGIN { \
int32_t __N=(n); \
while(__N>0) { \
U16_BACK_1_UNSAFE(s, i); \
--__N; \
} \
} UPRV_BLOCK_MACRO_END
/**
* Move the string offset from one code point boundary to the n-th one before it,
* i.e., move backward by n code points.
* (Pre-decrementing backward iteration.)
* The input offset may be the same as the string length.
* "Safe" macro, handles unpaired surrogates and checks for string boundaries.
*
* @param s const UChar * string
* @param start start of string
* @param i string offset, must be start<i
* @param n number of code points to skip
* @see U16_BACK_N_UNSAFE
* @stable ICU 2.4
*/
#define U16_BACK_N(s, start, i, n) UPRV_BLOCK_MACRO_BEGIN { \
int32_t __N=(n); \
while(__N>0 && (i)>(start)) { \
U16_BACK_1(s, start, i); \
--__N; \
} \
} UPRV_BLOCK_MACRO_END
/**
* Adjust a random-access offset to a code point boundary after a code point.
* If the offset is behind the lead surrogate of a surrogate pair,
* then the offset is incremented.
* Otherwise, it is not modified.
* The input offset may be the same as the string length.
* "Unsafe" macro, assumes well-formed UTF-16.
*
* @param s const UChar * string
* @param i string offset
* @see U16_SET_CP_LIMIT
* @stable ICU 2.4
*/
#define U16_SET_CP_LIMIT_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \
if(U16_IS_LEAD((s)[(i)-1])) { \
++(i); \
} \
} UPRV_BLOCK_MACRO_END
/**
* Adjust a random-access offset to a code point boundary after a code point.
* If the offset is behind the lead surrogate of a surrogate pair,
* then the offset is incremented.
* Otherwise, it is not modified.
* The input offset may be the same as the string length.
* "Safe" macro, handles unpaired surrogates and checks for string boundaries.
*
* The length can be negative for a NUL-terminated string.
*
* @param s const UChar * string
* @param start int32_t starting string offset (usually 0)
* @param i int32_t string offset, start<=i<=length
* @param length int32_t string length
* @see U16_SET_CP_LIMIT_UNSAFE
* @stable ICU 2.4
*/
#define U16_SET_CP_LIMIT(s, start, i, length) UPRV_BLOCK_MACRO_BEGIN { \
if((start)<(i) && ((i)<(length) || (length)<0) && U16_IS_LEAD((s)[(i)-1]) && U16_IS_TRAIL((s)[i])) { \
++(i); \
} \
} UPRV_BLOCK_MACRO_END
#endif

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@ -0,0 +1,881 @@
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
*
* Copyright (C) 1999-2015, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
* file name: utf8.h
* encoding: UTF-8
* tab size: 8 (not used)
* indentation:4
*
* created on: 1999sep13
* created by: Markus W. Scherer
*/
/**
* \file
* \brief C API: 8-bit Unicode handling macros
*
* This file defines macros to deal with 8-bit Unicode (UTF-8) code units (bytes) and strings.
*
* For more information see utf.h and the ICU User Guide Strings chapter
* (http://userguide.icu-project.org/strings).
*
* <em>Usage:</em>
* ICU coding guidelines for if() statements should be followed when using these macros.
* Compound statements (curly braces {}) must be used for if-else-while...
* bodies and all macro statements should be terminated with semicolon.
*/
#ifndef __UTF8_H__
#define __UTF8_H__
#include "unicode/umachine.h"
#ifndef __UTF_H__
# include "unicode/utf.h"
#endif
/* internal definitions ----------------------------------------------------- */
/**
* Counts the trail bytes for a UTF-8 lead byte.
* Returns 0 for 0..0xc1 as well as for 0xf5..0xff.
* leadByte might be evaluated multiple times.
*
* This is internal since it is not meant to be called directly by external clients;
* however it is called by public macros in this file and thus must remain stable.
*
* @param leadByte The first byte of a UTF-8 sequence. Must be 0..0xff.
* @internal
*/
#define U8_COUNT_TRAIL_BYTES(leadByte) \
(U8_IS_LEAD(leadByte) ? \
((uint8_t)(leadByte)>=0xe0)+((uint8_t)(leadByte)>=0xf0)+1 : 0)
/**
* Counts the trail bytes for a UTF-8 lead byte of a valid UTF-8 sequence.
* Returns 0 for 0..0xc1. Undefined for 0xf5..0xff.
* leadByte might be evaluated multiple times.
*
* This is internal since it is not meant to be called directly by external clients;
* however it is called by public macros in this file and thus must remain stable.
*
* @param leadByte The first byte of a UTF-8 sequence. Must be 0..0xff.
* @internal
*/
#define U8_COUNT_TRAIL_BYTES_UNSAFE(leadByte) \
(((uint8_t)(leadByte)>=0xc2)+((uint8_t)(leadByte)>=0xe0)+((uint8_t)(leadByte)>=0xf0))
/**
* Mask a UTF-8 lead byte, leave only the lower bits that form part of the code point value.
*
* This is internal since it is not meant to be called directly by external clients;
* however it is called by public macros in this file and thus must remain stable.
* @internal
*/
#define U8_MASK_LEAD_BYTE(leadByte, countTrailBytes) ((leadByte)&=(1<<(6-(countTrailBytes)))-1)
/**
* Internal bit vector for 3-byte UTF-8 validity check, for use in U8_IS_VALID_LEAD3_AND_T1.
* Each bit indicates whether one lead byte + first trail byte pair starts a valid sequence.
* Lead byte E0..EF bits 3..0 are used as byte index,
* first trail byte bits 7..5 are used as bit index into that byte.
* @see U8_IS_VALID_LEAD3_AND_T1
* @internal
*/
#define U8_LEAD3_T1_BITS "\x20\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x10\x30\x30"
/**
* Internal 3-byte UTF-8 validity check.
* Non-zero if lead byte E0..EF and first trail byte 00..FF start a valid sequence.
* @internal
*/
#define U8_IS_VALID_LEAD3_AND_T1(lead, t1) (U8_LEAD3_T1_BITS[(lead)&0xf]&(1<<((uint8_t)(t1)>>5)))
/**
* Internal bit vector for 4-byte UTF-8 validity check, for use in U8_IS_VALID_LEAD4_AND_T1.
* Each bit indicates whether one lead byte + first trail byte pair starts a valid sequence.
* First trail byte bits 7..4 are used as byte index,
* lead byte F0..F4 bits 2..0 are used as bit index into that byte.
* @see U8_IS_VALID_LEAD4_AND_T1
* @internal
*/
#define U8_LEAD4_T1_BITS "\x00\x00\x00\x00\x00\x00\x00\x00\x1E\x0F\x0F\x0F\x00\x00\x00\x00"
/**
* Internal 4-byte UTF-8 validity check.
* Non-zero if lead byte F0..F4 and first trail byte 00..FF start a valid sequence.
* @internal
*/
#define U8_IS_VALID_LEAD4_AND_T1(lead, t1) (U8_LEAD4_T1_BITS[(uint8_t)(t1)>>4]&(1<<((lead)&7)))
/**
* Function for handling "next code point" with error-checking.
*
* This is internal since it is not meant to be called directly by external clients;
* however it is U_STABLE (not U_INTERNAL) since it is called by public macros in this
* file and thus must remain stable, and should not be hidden when other internal
* functions are hidden (otherwise public macros would fail to compile).
* @internal
*/
U_STABLE UChar32 U_EXPORT2
utf8_nextCharSafeBody(const uint8_t *s, int32_t *pi, int32_t length, UChar32 c, UBool strict);
/**
* Function for handling "append code point" with error-checking.
*
* This is internal since it is not meant to be called directly by external clients;
* however it is U_STABLE (not U_INTERNAL) since it is called by public macros in this
* file and thus must remain stable, and should not be hidden when other internal
* functions are hidden (otherwise public macros would fail to compile).
* @internal
*/
U_STABLE int32_t U_EXPORT2
utf8_appendCharSafeBody(uint8_t *s, int32_t i, int32_t length, UChar32 c, UBool *pIsError);
/**
* Function for handling "previous code point" with error-checking.
*
* This is internal since it is not meant to be called directly by external clients;
* however it is U_STABLE (not U_INTERNAL) since it is called by public macros in this
* file and thus must remain stable, and should not be hidden when other internal
* functions are hidden (otherwise public macros would fail to compile).
* @internal
*/
U_STABLE UChar32 U_EXPORT2
utf8_prevCharSafeBody(const uint8_t *s, int32_t start, int32_t *pi, UChar32 c, UBool strict);
/**
* Function for handling "skip backward one code point" with error-checking.
*
* This is internal since it is not meant to be called directly by external clients;
* however it is U_STABLE (not U_INTERNAL) since it is called by public macros in this
* file and thus must remain stable, and should not be hidden when other internal
* functions are hidden (otherwise public macros would fail to compile).
* @internal
*/
U_STABLE int32_t U_EXPORT2
utf8_back1SafeBody(const uint8_t *s, int32_t start, int32_t i);
/* single-code point definitions -------------------------------------------- */
/**
* Does this code unit (byte) encode a code point by itself (US-ASCII 0..0x7f)?
* @param c 8-bit code unit (byte)
* @return TRUE or FALSE
* @stable ICU 2.4
*/
#define U8_IS_SINGLE(c) (((c)&0x80)==0)
/**
* Is this code unit (byte) a UTF-8 lead byte? (0xC2..0xF4)
* @param c 8-bit code unit (byte)
* @return TRUE or FALSE
* @stable ICU 2.4
*/
#define U8_IS_LEAD(c) ((uint8_t)((c)-0xc2)<=0x32)
// 0x32=0xf4-0xc2
/**
* Is this code unit (byte) a UTF-8 trail byte? (0x80..0xBF)
* @param c 8-bit code unit (byte)
* @return TRUE or FALSE
* @stable ICU 2.4
*/
#define U8_IS_TRAIL(c) ((int8_t)(c)<-0x40)
/**
* How many code units (bytes) are used for the UTF-8 encoding
* of this Unicode code point?
* @param c 32-bit code point
* @return 1..4, or 0 if c is a surrogate or not a Unicode code point
* @stable ICU 2.4
*/
#define U8_LENGTH(c) \
((uint32_t)(c)<=0x7f ? 1 : \
((uint32_t)(c)<=0x7ff ? 2 : \
((uint32_t)(c)<=0xd7ff ? 3 : \
((uint32_t)(c)<=0xdfff || (uint32_t)(c)>0x10ffff ? 0 : \
((uint32_t)(c)<=0xffff ? 3 : 4)\
) \
) \
) \
)
/**
* The maximum number of UTF-8 code units (bytes) per Unicode code point (U+0000..U+10ffff).
* @return 4
* @stable ICU 2.4
*/
#define U8_MAX_LENGTH 4
/**
* Get a code point from a string at a random-access offset,
* without changing the offset.
* The offset may point to either the lead byte or one of the trail bytes
* for a code point, in which case the macro will read all of the bytes
* for the code point.
* The result is undefined if the offset points to an illegal UTF-8
* byte sequence.
* Iteration through a string is more efficient with U8_NEXT_UNSAFE or U8_NEXT.
*
* @param s const uint8_t * string
* @param i string offset
* @param c output UChar32 variable
* @see U8_GET
* @stable ICU 2.4
*/
#define U8_GET_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \
int32_t _u8_get_unsafe_index=(int32_t)(i); \
U8_SET_CP_START_UNSAFE(s, _u8_get_unsafe_index); \
U8_NEXT_UNSAFE(s, _u8_get_unsafe_index, c); \
} UPRV_BLOCK_MACRO_END
/**
* Get a code point from a string at a random-access offset,
* without changing the offset.
* The offset may point to either the lead byte or one of the trail bytes
* for a code point, in which case the macro will read all of the bytes
* for the code point.
*
* The length can be negative for a NUL-terminated string.
*
* If the offset points to an illegal UTF-8 byte sequence, then
* c is set to a negative value.
* Iteration through a string is more efficient with U8_NEXT_UNSAFE or U8_NEXT.
*
* @param s const uint8_t * string
* @param start int32_t starting string offset
* @param i int32_t string offset, must be start<=i<length
* @param length int32_t string length
* @param c output UChar32 variable, set to <0 in case of an error
* @see U8_GET_UNSAFE
* @stable ICU 2.4
*/
#define U8_GET(s, start, i, length, c) UPRV_BLOCK_MACRO_BEGIN { \
int32_t _u8_get_index=(i); \
U8_SET_CP_START(s, start, _u8_get_index); \
U8_NEXT(s, _u8_get_index, length, c); \
} UPRV_BLOCK_MACRO_END
/**
* Get a code point from a string at a random-access offset,
* without changing the offset.
* The offset may point to either the lead byte or one of the trail bytes
* for a code point, in which case the macro will read all of the bytes
* for the code point.
*
* The length can be negative for a NUL-terminated string.
*
* If the offset points to an illegal UTF-8 byte sequence, then
* c is set to U+FFFD.
* Iteration through a string is more efficient with U8_NEXT_UNSAFE or U8_NEXT_OR_FFFD.
*
* This macro does not distinguish between a real U+FFFD in the text
* and U+FFFD returned for an ill-formed sequence.
* Use U8_GET() if that distinction is important.
*
* @param s const uint8_t * string
* @param start int32_t starting string offset
* @param i int32_t string offset, must be start<=i<length
* @param length int32_t string length
* @param c output UChar32 variable, set to U+FFFD in case of an error
* @see U8_GET
* @stable ICU 51
*/
#define U8_GET_OR_FFFD(s, start, i, length, c) UPRV_BLOCK_MACRO_BEGIN { \
int32_t _u8_get_index=(i); \
U8_SET_CP_START(s, start, _u8_get_index); \
U8_NEXT_OR_FFFD(s, _u8_get_index, length, c); \
} UPRV_BLOCK_MACRO_END
/* definitions with forward iteration --------------------------------------- */
/**
* Get a code point from a string at a code point boundary offset,
* and advance the offset to the next code point boundary.
* (Post-incrementing forward iteration.)
* "Unsafe" macro, assumes well-formed UTF-8.
*
* The offset may point to the lead byte of a multi-byte sequence,
* in which case the macro will read the whole sequence.
* The result is undefined if the offset points to a trail byte
* or an illegal UTF-8 sequence.
*
* @param s const uint8_t * string
* @param i string offset
* @param c output UChar32 variable
* @see U8_NEXT
* @stable ICU 2.4
*/
#define U8_NEXT_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \
(c)=(uint8_t)(s)[(i)++]; \
if(!U8_IS_SINGLE(c)) { \
if((c)<0xe0) { \
(c)=(((c)&0x1f)<<6)|((s)[(i)++]&0x3f); \
} else if((c)<0xf0) { \
/* no need for (c&0xf) because the upper bits are truncated after <<12 in the cast to (UChar) */ \
(c)=(UChar)(((c)<<12)|(((s)[i]&0x3f)<<6)|((s)[(i)+1]&0x3f)); \
(i)+=2; \
} else { \
(c)=(((c)&7)<<18)|(((s)[i]&0x3f)<<12)|(((s)[(i)+1]&0x3f)<<6)|((s)[(i)+2]&0x3f); \
(i)+=3; \
} \
} \
} UPRV_BLOCK_MACRO_END
/**
* Get a code point from a string at a code point boundary offset,
* and advance the offset to the next code point boundary.
* (Post-incrementing forward iteration.)
* "Safe" macro, checks for illegal sequences and for string boundaries.
*
* The length can be negative for a NUL-terminated string.
*
* The offset may point to the lead byte of a multi-byte sequence,
* in which case the macro will read the whole sequence.
* If the offset points to a trail byte or an illegal UTF-8 sequence, then
* c is set to a negative value.
*
* @param s const uint8_t * string
* @param i int32_t string offset, must be i<length
* @param length int32_t string length
* @param c output UChar32 variable, set to <0 in case of an error
* @see U8_NEXT_UNSAFE
* @stable ICU 2.4
*/
#define U8_NEXT(s, i, length, c) U8_INTERNAL_NEXT_OR_SUB(s, i, length, c, U_SENTINEL)
/**
* Get a code point from a string at a code point boundary offset,
* and advance the offset to the next code point boundary.
* (Post-incrementing forward iteration.)
* "Safe" macro, checks for illegal sequences and for string boundaries.
*
* The length can be negative for a NUL-terminated string.
*
* The offset may point to the lead byte of a multi-byte sequence,
* in which case the macro will read the whole sequence.
* If the offset points to a trail byte or an illegal UTF-8 sequence, then
* c is set to U+FFFD.
*
* This macro does not distinguish between a real U+FFFD in the text
* and U+FFFD returned for an ill-formed sequence.
* Use U8_NEXT() if that distinction is important.
*
* @param s const uint8_t * string
* @param i int32_t string offset, must be i<length
* @param length int32_t string length
* @param c output UChar32 variable, set to U+FFFD in case of an error
* @see U8_NEXT
* @stable ICU 51
*/
#define U8_NEXT_OR_FFFD(s, i, length, c) U8_INTERNAL_NEXT_OR_SUB(s, i, length, c, 0xfffd)
/** @internal */
#define U8_INTERNAL_NEXT_OR_SUB(s, i, length, c, sub) UPRV_BLOCK_MACRO_BEGIN { \
(c)=(uint8_t)(s)[(i)++]; \
if(!U8_IS_SINGLE(c)) { \
uint8_t __t = 0; \
if((i)!=(length) && \
/* fetch/validate/assemble all but last trail byte */ \
((c)>=0xe0 ? \
((c)<0xf0 ? /* U+0800..U+FFFF except surrogates */ \
U8_LEAD3_T1_BITS[(c)&=0xf]&(1<<((__t=(s)[i])>>5)) && \
(__t&=0x3f, 1) \
: /* U+10000..U+10FFFF */ \
((c)-=0xf0)<=4 && \
U8_LEAD4_T1_BITS[(__t=(s)[i])>>4]&(1<<(c)) && \
((c)=((c)<<6)|(__t&0x3f), ++(i)!=(length)) && \
(__t=(s)[i]-0x80)<=0x3f) && \
/* valid second-to-last trail byte */ \
((c)=((c)<<6)|__t, ++(i)!=(length)) \
: /* U+0080..U+07FF */ \
(c)>=0xc2 && ((c)&=0x1f, 1)) && \
/* last trail byte */ \
(__t=(s)[i]-0x80)<=0x3f && \
((c)=((c)<<6)|__t, ++(i), 1)) { \
} else { \
(c)=(sub); /* ill-formed*/ \
} \
} \
} UPRV_BLOCK_MACRO_END
/**
* Append a code point to a string, overwriting 1 to 4 bytes.
* The offset points to the current end of the string contents
* and is advanced (post-increment).
* "Unsafe" macro, assumes a valid code point and sufficient space in the string.
* Otherwise, the result is undefined.
*
* @param s const uint8_t * string buffer
* @param i string offset
* @param c code point to append
* @see U8_APPEND
* @stable ICU 2.4
*/
#define U8_APPEND_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \
uint32_t __uc=(c); \
if(__uc<=0x7f) { \
(s)[(i)++]=(uint8_t)__uc; \
} else { \
if(__uc<=0x7ff) { \
(s)[(i)++]=(uint8_t)((__uc>>6)|0xc0); \
} else { \
if(__uc<=0xffff) { \
(s)[(i)++]=(uint8_t)((__uc>>12)|0xe0); \
} else { \
(s)[(i)++]=(uint8_t)((__uc>>18)|0xf0); \
(s)[(i)++]=(uint8_t)(((__uc>>12)&0x3f)|0x80); \
} \
(s)[(i)++]=(uint8_t)(((__uc>>6)&0x3f)|0x80); \
} \
(s)[(i)++]=(uint8_t)((__uc&0x3f)|0x80); \
} \
} UPRV_BLOCK_MACRO_END
/**
* Append a code point to a string, overwriting 1 to 4 bytes.
* The offset points to the current end of the string contents
* and is advanced (post-increment).
* "Safe" macro, checks for a valid code point.
* If a non-ASCII code point is written, checks for sufficient space in the string.
* If the code point is not valid or trail bytes do not fit,
* then isError is set to TRUE.
*
* @param s const uint8_t * string buffer
* @param i int32_t string offset, must be i<capacity
* @param capacity int32_t size of the string buffer
* @param c UChar32 code point to append
* @param isError output UBool set to TRUE if an error occurs, otherwise not modified
* @see U8_APPEND_UNSAFE
* @stable ICU 2.4
*/
#define U8_APPEND(s, i, capacity, c, isError) UPRV_BLOCK_MACRO_BEGIN { \
uint32_t __uc=(c); \
if(__uc<=0x7f) { \
(s)[(i)++]=(uint8_t)__uc; \
} else if(__uc<=0x7ff && (i)+1<(capacity)) { \
(s)[(i)++]=(uint8_t)((__uc>>6)|0xc0); \
(s)[(i)++]=(uint8_t)((__uc&0x3f)|0x80); \
} else if((__uc<=0xd7ff || (0xe000<=__uc && __uc<=0xffff)) && (i)+2<(capacity)) { \
(s)[(i)++]=(uint8_t)((__uc>>12)|0xe0); \
(s)[(i)++]=(uint8_t)(((__uc>>6)&0x3f)|0x80); \
(s)[(i)++]=(uint8_t)((__uc&0x3f)|0x80); \
} else if(0xffff<__uc && __uc<=0x10ffff && (i)+3<(capacity)) { \
(s)[(i)++]=(uint8_t)((__uc>>18)|0xf0); \
(s)[(i)++]=(uint8_t)(((__uc>>12)&0x3f)|0x80); \
(s)[(i)++]=(uint8_t)(((__uc>>6)&0x3f)|0x80); \
(s)[(i)++]=(uint8_t)((__uc&0x3f)|0x80); \
} else { \
(isError)=TRUE; \
} \
} UPRV_BLOCK_MACRO_END
/**
* Advance the string offset from one code point boundary to the next.
* (Post-incrementing iteration.)
* "Unsafe" macro, assumes well-formed UTF-8.
*
* @param s const uint8_t * string
* @param i string offset
* @see U8_FWD_1
* @stable ICU 2.4
*/
#define U8_FWD_1_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \
(i)+=1+U8_COUNT_TRAIL_BYTES_UNSAFE((s)[i]); \
} UPRV_BLOCK_MACRO_END
/**
* Advance the string offset from one code point boundary to the next.
* (Post-incrementing iteration.)
* "Safe" macro, checks for illegal sequences and for string boundaries.
*
* The length can be negative for a NUL-terminated string.
*
* @param s const uint8_t * string
* @param i int32_t string offset, must be i<length
* @param length int32_t string length
* @see U8_FWD_1_UNSAFE
* @stable ICU 2.4
*/
#define U8_FWD_1(s, i, length) UPRV_BLOCK_MACRO_BEGIN { \
uint8_t __b=(s)[(i)++]; \
if(U8_IS_LEAD(__b) && (i)!=(length)) { \
uint8_t __t1=(s)[i]; \
if((0xe0<=__b && __b<0xf0)) { \
if(U8_IS_VALID_LEAD3_AND_T1(__b, __t1) && \
++(i)!=(length) && U8_IS_TRAIL((s)[i])) { \
++(i); \
} \
} else if(__b<0xe0) { \
if(U8_IS_TRAIL(__t1)) { \
++(i); \
} \
} else /* c>=0xf0 */ { \
if(U8_IS_VALID_LEAD4_AND_T1(__b, __t1) && \
++(i)!=(length) && U8_IS_TRAIL((s)[i]) && \
++(i)!=(length) && U8_IS_TRAIL((s)[i])) { \
++(i); \
} \
} \
} \
} UPRV_BLOCK_MACRO_END
/**
* Advance the string offset from one code point boundary to the n-th next one,
* i.e., move forward by n code points.
* (Post-incrementing iteration.)
* "Unsafe" macro, assumes well-formed UTF-8.
*
* @param s const uint8_t * string
* @param i string offset
* @param n number of code points to skip
* @see U8_FWD_N
* @stable ICU 2.4
*/
#define U8_FWD_N_UNSAFE(s, i, n) UPRV_BLOCK_MACRO_BEGIN { \
int32_t __N=(n); \
while(__N>0) { \
U8_FWD_1_UNSAFE(s, i); \
--__N; \
} \
} UPRV_BLOCK_MACRO_END
/**
* Advance the string offset from one code point boundary to the n-th next one,
* i.e., move forward by n code points.
* (Post-incrementing iteration.)
* "Safe" macro, checks for illegal sequences and for string boundaries.
*
* The length can be negative for a NUL-terminated string.
*
* @param s const uint8_t * string
* @param i int32_t string offset, must be i<length
* @param length int32_t string length
* @param n number of code points to skip
* @see U8_FWD_N_UNSAFE
* @stable ICU 2.4
*/
#define U8_FWD_N(s, i, length, n) UPRV_BLOCK_MACRO_BEGIN { \
int32_t __N=(n); \
while(__N>0 && ((i)<(length) || ((length)<0 && (s)[i]!=0))) { \
U8_FWD_1(s, i, length); \
--__N; \
} \
} UPRV_BLOCK_MACRO_END
/**
* Adjust a random-access offset to a code point boundary
* at the start of a code point.
* If the offset points to a UTF-8 trail byte,
* then the offset is moved backward to the corresponding lead byte.
* Otherwise, it is not modified.
* "Unsafe" macro, assumes well-formed UTF-8.
*
* @param s const uint8_t * string
* @param i string offset
* @see U8_SET_CP_START
* @stable ICU 2.4
*/
#define U8_SET_CP_START_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \
while(U8_IS_TRAIL((s)[i])) { --(i); } \
} UPRV_BLOCK_MACRO_END
/**
* Adjust a random-access offset to a code point boundary
* at the start of a code point.
* If the offset points to a UTF-8 trail byte,
* then the offset is moved backward to the corresponding lead byte.
* Otherwise, it is not modified.
*
* "Safe" macro, checks for illegal sequences and for string boundaries.
* Unlike U8_TRUNCATE_IF_INCOMPLETE(), this macro always reads s[i].
*
* @param s const uint8_t * string
* @param start int32_t starting string offset (usually 0)
* @param i int32_t string offset, must be start<=i
* @see U8_SET_CP_START_UNSAFE
* @see U8_TRUNCATE_IF_INCOMPLETE
* @stable ICU 2.4
*/
#define U8_SET_CP_START(s, start, i) UPRV_BLOCK_MACRO_BEGIN { \
if(U8_IS_TRAIL((s)[(i)])) { \
(i)=utf8_back1SafeBody(s, start, (i)); \
} \
} UPRV_BLOCK_MACRO_END
/**
* If the string ends with a UTF-8 byte sequence that is valid so far
* but incomplete, then reduce the length of the string to end before
* the lead byte of that incomplete sequence.
* For example, if the string ends with E1 80, the length is reduced by 2.
*
* In all other cases (the string ends with a complete sequence, or it is not
* possible for any further trail byte to extend the trailing sequence)
* the length remains unchanged.
*
* Useful for processing text split across multiple buffers
* (save the incomplete sequence for later)
* and for optimizing iteration
* (check for string length only once per character).
*
* "Safe" macro, checks for illegal sequences and for string boundaries.
* Unlike U8_SET_CP_START(), this macro never reads s[length].
*
* (In UTF-16, simply check for U16_IS_LEAD(last code unit).)
*
* @param s const uint8_t * string
* @param start int32_t starting string offset (usually 0)
* @param length int32_t string length (usually start<=length)
* @see U8_SET_CP_START
* @stable ICU 61
*/
#define U8_TRUNCATE_IF_INCOMPLETE(s, start, length) UPRV_BLOCK_MACRO_BEGIN { \
if((length)>(start)) { \
uint8_t __b1=s[(length)-1]; \
if(U8_IS_SINGLE(__b1)) { \
/* common ASCII character */ \
} else if(U8_IS_LEAD(__b1)) { \
--(length); \
} else if(U8_IS_TRAIL(__b1) && ((length)-2)>=(start)) { \
uint8_t __b2=s[(length)-2]; \
if(0xe0<=__b2 && __b2<=0xf4) { \
if(__b2<0xf0 ? U8_IS_VALID_LEAD3_AND_T1(__b2, __b1) : \
U8_IS_VALID_LEAD4_AND_T1(__b2, __b1)) { \
(length)-=2; \
} \
} else if(U8_IS_TRAIL(__b2) && ((length)-3)>=(start)) { \
uint8_t __b3=s[(length)-3]; \
if(0xf0<=__b3 && __b3<=0xf4 && U8_IS_VALID_LEAD4_AND_T1(__b3, __b2)) { \
(length)-=3; \
} \
} \
} \
} \
} UPRV_BLOCK_MACRO_END
/* definitions with backward iteration -------------------------------------- */
/**
* Move the string offset from one code point boundary to the previous one
* and get the code point between them.
* (Pre-decrementing backward iteration.)
* "Unsafe" macro, assumes well-formed UTF-8.
*
* The input offset may be the same as the string length.
* If the offset is behind a multi-byte sequence, then the macro will read
* the whole sequence.
* If the offset is behind a lead byte, then that itself
* will be returned as the code point.
* The result is undefined if the offset is behind an illegal UTF-8 sequence.
*
* @param s const uint8_t * string
* @param i string offset
* @param c output UChar32 variable
* @see U8_PREV
* @stable ICU 2.4
*/
#define U8_PREV_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \
(c)=(uint8_t)(s)[--(i)]; \
if(U8_IS_TRAIL(c)) { \
uint8_t __b, __count=1, __shift=6; \
\
/* c is a trail byte */ \
(c)&=0x3f; \
for(;;) { \
__b=(s)[--(i)]; \
if(__b>=0xc0) { \
U8_MASK_LEAD_BYTE(__b, __count); \
(c)|=(UChar32)__b<<__shift; \
break; \
} else { \
(c)|=(UChar32)(__b&0x3f)<<__shift; \
++__count; \
__shift+=6; \
} \
} \
} \
} UPRV_BLOCK_MACRO_END
/**
* Move the string offset from one code point boundary to the previous one
* and get the code point between them.
* (Pre-decrementing backward iteration.)
* "Safe" macro, checks for illegal sequences and for string boundaries.
*
* The input offset may be the same as the string length.
* If the offset is behind a multi-byte sequence, then the macro will read
* the whole sequence.
* If the offset is behind a lead byte, then that itself
* will be returned as the code point.
* If the offset is behind an illegal UTF-8 sequence, then c is set to a negative value.
*
* @param s const uint8_t * string
* @param start int32_t starting string offset (usually 0)
* @param i int32_t string offset, must be start<i
* @param c output UChar32 variable, set to <0 in case of an error
* @see U8_PREV_UNSAFE
* @stable ICU 2.4
*/
#define U8_PREV(s, start, i, c) UPRV_BLOCK_MACRO_BEGIN { \
(c)=(uint8_t)(s)[--(i)]; \
if(!U8_IS_SINGLE(c)) { \
(c)=utf8_prevCharSafeBody((const uint8_t *)s, start, &(i), c, -1); \
} \
} UPRV_BLOCK_MACRO_END
/**
* Move the string offset from one code point boundary to the previous one
* and get the code point between them.
* (Pre-decrementing backward iteration.)
* "Safe" macro, checks for illegal sequences and for string boundaries.
*
* The input offset may be the same as the string length.
* If the offset is behind a multi-byte sequence, then the macro will read
* the whole sequence.
* If the offset is behind a lead byte, then that itself
* will be returned as the code point.
* If the offset is behind an illegal UTF-8 sequence, then c is set to U+FFFD.
*
* This macro does not distinguish between a real U+FFFD in the text
* and U+FFFD returned for an ill-formed sequence.
* Use U8_PREV() if that distinction is important.
*
* @param s const uint8_t * string
* @param start int32_t starting string offset (usually 0)
* @param i int32_t string offset, must be start<i
* @param c output UChar32 variable, set to U+FFFD in case of an error
* @see U8_PREV
* @stable ICU 51
*/
#define U8_PREV_OR_FFFD(s, start, i, c) UPRV_BLOCK_MACRO_BEGIN { \
(c)=(uint8_t)(s)[--(i)]; \
if(!U8_IS_SINGLE(c)) { \
(c)=utf8_prevCharSafeBody((const uint8_t *)s, start, &(i), c, -3); \
} \
} UPRV_BLOCK_MACRO_END
/**
* Move the string offset from one code point boundary to the previous one.
* (Pre-decrementing backward iteration.)
* The input offset may be the same as the string length.
* "Unsafe" macro, assumes well-formed UTF-8.
*
* @param s const uint8_t * string
* @param i string offset
* @see U8_BACK_1
* @stable ICU 2.4
*/
#define U8_BACK_1_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \
while(U8_IS_TRAIL((s)[--(i)])) {} \
} UPRV_BLOCK_MACRO_END
/**
* Move the string offset from one code point boundary to the previous one.
* (Pre-decrementing backward iteration.)
* The input offset may be the same as the string length.
* "Safe" macro, checks for illegal sequences and for string boundaries.
*
* @param s const uint8_t * string
* @param start int32_t starting string offset (usually 0)
* @param i int32_t string offset, must be start<i
* @see U8_BACK_1_UNSAFE
* @stable ICU 2.4
*/
#define U8_BACK_1(s, start, i) UPRV_BLOCK_MACRO_BEGIN { \
if(U8_IS_TRAIL((s)[--(i)])) { \
(i)=utf8_back1SafeBody(s, start, (i)); \
} \
} UPRV_BLOCK_MACRO_END
/**
* Move the string offset from one code point boundary to the n-th one before it,
* i.e., move backward by n code points.
* (Pre-decrementing backward iteration.)
* The input offset may be the same as the string length.
* "Unsafe" macro, assumes well-formed UTF-8.
*
* @param s const uint8_t * string
* @param i string offset
* @param n number of code points to skip
* @see U8_BACK_N
* @stable ICU 2.4
*/
#define U8_BACK_N_UNSAFE(s, i, n) UPRV_BLOCK_MACRO_BEGIN { \
int32_t __N=(n); \
while(__N>0) { \
U8_BACK_1_UNSAFE(s, i); \
--__N; \
} \
} UPRV_BLOCK_MACRO_END
/**
* Move the string offset from one code point boundary to the n-th one before it,
* i.e., move backward by n code points.
* (Pre-decrementing backward iteration.)
* The input offset may be the same as the string length.
* "Safe" macro, checks for illegal sequences and for string boundaries.
*
* @param s const uint8_t * string
* @param start int32_t index of the start of the string
* @param i int32_t string offset, must be start<i
* @param n number of code points to skip
* @see U8_BACK_N_UNSAFE
* @stable ICU 2.4
*/
#define U8_BACK_N(s, start, i, n) UPRV_BLOCK_MACRO_BEGIN { \
int32_t __N=(n); \
while(__N>0 && (i)>(start)) { \
U8_BACK_1(s, start, i); \
--__N; \
} \
} UPRV_BLOCK_MACRO_END
/**
* Adjust a random-access offset to a code point boundary after a code point.
* If the offset is behind a partial multi-byte sequence,
* then the offset is incremented to behind the whole sequence.
* Otherwise, it is not modified.
* The input offset may be the same as the string length.
* "Unsafe" macro, assumes well-formed UTF-8.
*
* @param s const uint8_t * string
* @param i string offset
* @see U8_SET_CP_LIMIT
* @stable ICU 2.4
*/
#define U8_SET_CP_LIMIT_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \
U8_BACK_1_UNSAFE(s, i); \
U8_FWD_1_UNSAFE(s, i); \
} UPRV_BLOCK_MACRO_END
/**
* Adjust a random-access offset to a code point boundary after a code point.
* If the offset is behind a partial multi-byte sequence,
* then the offset is incremented to behind the whole sequence.
* Otherwise, it is not modified.
* The input offset may be the same as the string length.
* "Safe" macro, checks for illegal sequences and for string boundaries.
*
* The length can be negative for a NUL-terminated string.
*
* @param s const uint8_t * string
* @param start int32_t starting string offset (usually 0)
* @param i int32_t string offset, must be start<=i<=length
* @param length int32_t string length
* @see U8_SET_CP_LIMIT_UNSAFE
* @stable ICU 2.4
*/
#define U8_SET_CP_LIMIT(s, start, i, length) UPRV_BLOCK_MACRO_BEGIN { \
if((start)<(i) && ((i)<(length) || (length)<0)) { \
U8_BACK_1(s, start, i); \
U8_FWD_1(s, i, length); \
} \
} UPRV_BLOCK_MACRO_END
#endif