825 lines
28 KiB
C
825 lines
28 KiB
C
/*
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*******************************************************************************
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*
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* Copyright (C) 1999-2014, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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*******************************************************************************
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* file name: utf8.h
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 1999sep13
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* created by: Markus W. Scherer
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*/
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/**
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* \file
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* \brief C API: 8-bit Unicode handling macros
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*
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* This file defines macros to deal with 8-bit Unicode (UTF-8) code units (bytes) and strings.
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*
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* For more information see utf.h and the ICU User Guide Strings chapter
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* (http://userguide.icu-project.org/strings).
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*
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* <em>Usage:</em>
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* ICU coding guidelines for if() statements should be followed when using these macros.
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* Compound statements (curly braces {}) must be used for if-else-while...
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* bodies and all macro statements should be terminated with semicolon.
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*/
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#ifndef __UTF8_H__
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#define __UTF8_H__
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#include "unicode/umachine.h"
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#ifndef __UTF_H__
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# include "unicode/utf.h"
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#endif
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/* internal definitions ----------------------------------------------------- */
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/**
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* \var utf8_countTrailBytes
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* Internal array with numbers of trail bytes for any given byte used in
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* lead byte position.
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*
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* This is internal since it is not meant to be called directly by external clients;
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* however it is called by public macros in this file and thus must remain stable,
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* and should not be hidden when other internal functions are hidden (otherwise
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* public macros would fail to compile).
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* @internal
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*/
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#ifdef U_UTF8_IMPL
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U_EXPORT const uint8_t
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#elif defined(U_STATIC_IMPLEMENTATION) || defined(U_COMMON_IMPLEMENTATION)
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U_CFUNC const uint8_t
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#else
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U_CFUNC U_IMPORT const uint8_t /* U_IMPORT2? */ /*U_IMPORT*/
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#endif
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utf8_countTrailBytes[256];
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/**
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* Counts the trail bytes for a UTF-8 lead byte.
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* Returns 0 for 0..0xbf as well as for 0xfe and 0xff.
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*
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* This is internal since it is not meant to be called directly by external clients;
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* however it is called by public macros in this file and thus must remain stable.
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*
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* Note: Beginning with ICU 50, the implementation uses a multi-condition expression
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* which was shown in 2012 (on x86-64) to compile to fast, branch-free code.
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* leadByte is evaluated multiple times.
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*
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* The pre-ICU 50 implementation used the exported array utf8_countTrailBytes:
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* #define U8_COUNT_TRAIL_BYTES(leadByte) (utf8_countTrailBytes[leadByte])
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* leadByte was evaluated exactly once.
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*
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* @param leadByte The first byte of a UTF-8 sequence. Must be 0..0xff.
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* @internal
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*/
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#define U8_COUNT_TRAIL_BYTES(leadByte) \
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((uint8_t)(leadByte)<0xf0 ? \
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((uint8_t)(leadByte)>=0xc0)+((uint8_t)(leadByte)>=0xe0) : \
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(uint8_t)(leadByte)<0xfe ? 3+((uint8_t)(leadByte)>=0xf8)+((uint8_t)(leadByte)>=0xfc) : 0)
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/**
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* Counts the trail bytes for a UTF-8 lead byte of a valid UTF-8 sequence.
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* The maximum supported lead byte is 0xf4 corresponding to U+10FFFF.
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* leadByte might be evaluated multiple times.
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*
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* This is internal since it is not meant to be called directly by external clients;
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* however it is called by public macros in this file and thus must remain stable.
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*
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* @param leadByte The first byte of a UTF-8 sequence. Must be 0..0xff.
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* @internal
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*/
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#define U8_COUNT_TRAIL_BYTES_UNSAFE(leadByte) \
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(((leadByte)>=0xc0)+((leadByte)>=0xe0)+((leadByte)>=0xf0))
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/**
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* Mask a UTF-8 lead byte, leave only the lower bits that form part of the code point value.
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*
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* This is internal since it is not meant to be called directly by external clients;
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* however it is called by public macros in this file and thus must remain stable.
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* @internal
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*/
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#define U8_MASK_LEAD_BYTE(leadByte, countTrailBytes) ((leadByte)&=(1<<(6-(countTrailBytes)))-1)
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/**
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* Function for handling "next code point" with error-checking.
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*
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* This is internal since it is not meant to be called directly by external clients;
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* however it is U_STABLE (not U_INTERNAL) since it is called by public macros in this
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* file and thus must remain stable, and should not be hidden when other internal
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* functions are hidden (otherwise public macros would fail to compile).
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* @internal
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*/
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U_STABLE UChar32 U_EXPORT2
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utf8_nextCharSafeBody(const uint8_t *s, int32_t *pi, int32_t length, UChar32 c, UBool strict);
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/**
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* Function for handling "append code point" with error-checking.
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*
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* This is internal since it is not meant to be called directly by external clients;
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* however it is U_STABLE (not U_INTERNAL) since it is called by public macros in this
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* file and thus must remain stable, and should not be hidden when other internal
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* functions are hidden (otherwise public macros would fail to compile).
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* @internal
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*/
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U_STABLE int32_t U_EXPORT2
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utf8_appendCharSafeBody(uint8_t *s, int32_t i, int32_t length, UChar32 c, UBool *pIsError);
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/**
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* Function for handling "previous code point" with error-checking.
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*
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* This is internal since it is not meant to be called directly by external clients;
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* however it is U_STABLE (not U_INTERNAL) since it is called by public macros in this
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* file and thus must remain stable, and should not be hidden when other internal
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* functions are hidden (otherwise public macros would fail to compile).
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* @internal
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*/
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U_STABLE UChar32 U_EXPORT2
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utf8_prevCharSafeBody(const uint8_t *s, int32_t start, int32_t *pi, UChar32 c, UBool strict);
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/**
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* Function for handling "skip backward one code point" with error-checking.
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*
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* This is internal since it is not meant to be called directly by external clients;
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* however it is U_STABLE (not U_INTERNAL) since it is called by public macros in this
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* file and thus must remain stable, and should not be hidden when other internal
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* functions are hidden (otherwise public macros would fail to compile).
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* @internal
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*/
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U_STABLE int32_t U_EXPORT2
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utf8_back1SafeBody(const uint8_t *s, int32_t start, int32_t i);
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/* single-code point definitions -------------------------------------------- */
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/**
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* Does this code unit (byte) encode a code point by itself (US-ASCII 0..0x7f)?
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* @param c 8-bit code unit (byte)
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* @return TRUE or FALSE
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* @stable ICU 2.4
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*/
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#define U8_IS_SINGLE(c) (((c)&0x80)==0)
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/**
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* Is this code unit (byte) a UTF-8 lead byte?
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* @param c 8-bit code unit (byte)
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* @return TRUE or FALSE
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* @stable ICU 2.4
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*/
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#define U8_IS_LEAD(c) ((uint8_t)((c)-0xc0)<0x3e)
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/**
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* Is this code unit (byte) a UTF-8 trail byte?
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* @param c 8-bit code unit (byte)
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* @return TRUE or FALSE
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* @stable ICU 2.4
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*/
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#define U8_IS_TRAIL(c) (((c)&0xc0)==0x80)
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/**
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* How many code units (bytes) are used for the UTF-8 encoding
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* of this Unicode code point?
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* @param c 32-bit code point
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* @return 1..4, or 0 if c is a surrogate or not a Unicode code point
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* @stable ICU 2.4
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*/
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#define U8_LENGTH(c) \
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((uint32_t)(c)<=0x7f ? 1 : \
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((uint32_t)(c)<=0x7ff ? 2 : \
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((uint32_t)(c)<=0xd7ff ? 3 : \
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((uint32_t)(c)<=0xdfff || (uint32_t)(c)>0x10ffff ? 0 : \
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((uint32_t)(c)<=0xffff ? 3 : 4)\
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) \
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) \
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) \
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)
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/**
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* The maximum number of UTF-8 code units (bytes) per Unicode code point (U+0000..U+10ffff).
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* @return 4
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* @stable ICU 2.4
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*/
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#define U8_MAX_LENGTH 4
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/**
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* Get a code point from a string at a random-access offset,
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* without changing the offset.
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* The offset may point to either the lead byte or one of the trail bytes
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* for a code point, in which case the macro will read all of the bytes
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* for the code point.
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* The result is undefined if the offset points to an illegal UTF-8
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* byte sequence.
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* Iteration through a string is more efficient with U8_NEXT_UNSAFE or U8_NEXT.
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*
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* @param s const uint8_t * string
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* @param i string offset
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* @param c output UChar32 variable
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* @see U8_GET
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* @stable ICU 2.4
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*/
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#define U8_GET_UNSAFE(s, i, c) { \
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int32_t _u8_get_unsafe_index=(int32_t)(i); \
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U8_SET_CP_START_UNSAFE(s, _u8_get_unsafe_index); \
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U8_NEXT_UNSAFE(s, _u8_get_unsafe_index, c); \
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}
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/**
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* Get a code point from a string at a random-access offset,
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* without changing the offset.
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* The offset may point to either the lead byte or one of the trail bytes
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* for a code point, in which case the macro will read all of the bytes
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* for the code point.
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*
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* The length can be negative for a NUL-terminated string.
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*
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* If the offset points to an illegal UTF-8 byte sequence, then
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* c is set to a negative value.
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* Iteration through a string is more efficient with U8_NEXT_UNSAFE or U8_NEXT.
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*
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* @param s const uint8_t * string
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* @param start int32_t starting string offset
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* @param i int32_t string offset, must be start<=i<length
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* @param length int32_t string length
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* @param c output UChar32 variable, set to <0 in case of an error
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* @see U8_GET_UNSAFE
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* @stable ICU 2.4
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*/
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#define U8_GET(s, start, i, length, c) { \
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int32_t _u8_get_index=(i); \
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U8_SET_CP_START(s, start, _u8_get_index); \
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U8_NEXT(s, _u8_get_index, length, c); \
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}
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/**
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* Get a code point from a string at a random-access offset,
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* without changing the offset.
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* The offset may point to either the lead byte or one of the trail bytes
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* for a code point, in which case the macro will read all of the bytes
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* for the code point.
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*
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* The length can be negative for a NUL-terminated string.
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*
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* If the offset points to an illegal UTF-8 byte sequence, then
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* c is set to U+FFFD.
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* Iteration through a string is more efficient with U8_NEXT_UNSAFE or U8_NEXT_OR_FFFD.
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*
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* This macro does not distinguish between a real U+FFFD in the text
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* and U+FFFD returned for an ill-formed sequence.
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* Use U8_GET() if that distinction is important.
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*
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* @param s const uint8_t * string
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* @param start int32_t starting string offset
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* @param i int32_t string offset, must be start<=i<length
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* @param length int32_t string length
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* @param c output UChar32 variable, set to U+FFFD in case of an error
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* @see U8_GET
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* @stable ICU 51
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*/
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#define U8_GET_OR_FFFD(s, start, i, length, c) { \
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int32_t _u8_get_index=(i); \
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U8_SET_CP_START(s, start, _u8_get_index); \
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U8_NEXT_OR_FFFD(s, _u8_get_index, length, c); \
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}
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/* definitions with forward iteration --------------------------------------- */
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/**
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* Get a code point from a string at a code point boundary offset,
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* and advance the offset to the next code point boundary.
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* (Post-incrementing forward iteration.)
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* "Unsafe" macro, assumes well-formed UTF-8.
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*
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* The offset may point to the lead byte of a multi-byte sequence,
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* in which case the macro will read the whole sequence.
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* The result is undefined if the offset points to a trail byte
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* or an illegal UTF-8 sequence.
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*
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* @param s const uint8_t * string
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* @param i string offset
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* @param c output UChar32 variable
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* @see U8_NEXT
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* @stable ICU 2.4
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*/
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#define U8_NEXT_UNSAFE(s, i, c) { \
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(c)=(uint8_t)(s)[(i)++]; \
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if((c)>=0x80) { \
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if((c)<0xe0) { \
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(c)=(((c)&0x1f)<<6)|((s)[(i)++]&0x3f); \
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} else if((c)<0xf0) { \
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/* no need for (c&0xf) because the upper bits are truncated after <<12 in the cast to (UChar) */ \
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(c)=(UChar)(((c)<<12)|(((s)[i]&0x3f)<<6)|((s)[(i)+1]&0x3f)); \
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(i)+=2; \
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} else { \
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(c)=(((c)&7)<<18)|(((s)[i]&0x3f)<<12)|(((s)[(i)+1]&0x3f)<<6)|((s)[(i)+2]&0x3f); \
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(i)+=3; \
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} \
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} \
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}
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/**
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* Get a code point from a string at a code point boundary offset,
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* and advance the offset to the next code point boundary.
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* (Post-incrementing forward iteration.)
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* "Safe" macro, checks for illegal sequences and for string boundaries.
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*
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* The length can be negative for a NUL-terminated string.
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*
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* The offset may point to the lead byte of a multi-byte sequence,
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* in which case the macro will read the whole sequence.
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* If the offset points to a trail byte or an illegal UTF-8 sequence, then
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* c is set to a negative value.
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*
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* @param s const uint8_t * string
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* @param i int32_t string offset, must be i<length
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* @param length int32_t string length
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* @param c output UChar32 variable, set to <0 in case of an error
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* @see U8_NEXT_UNSAFE
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* @stable ICU 2.4
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*/
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#define U8_NEXT(s, i, length, c) { \
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(c)=(uint8_t)(s)[(i)++]; \
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if((c)>=0x80) { \
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uint8_t __t1, __t2; \
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if( /* handle U+1000..U+CFFF inline */ \
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(0xe0<(c) && (c)<=0xec) && \
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(((i)+1)<(length) || (length)<0) && \
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(__t1=(uint8_t)((s)[i]-0x80))<=0x3f && \
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(__t2=(uint8_t)((s)[(i)+1]-0x80))<= 0x3f \
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) { \
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/* no need for (c&0xf) because the upper bits are truncated after <<12 in the cast to (UChar) */ \
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(c)=(UChar)(((c)<<12)|(__t1<<6)|__t2); \
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(i)+=2; \
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} else if( /* handle U+0080..U+07FF inline */ \
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((c)<0xe0 && (c)>=0xc2) && \
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((i)!=(length)) && \
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(__t1=(uint8_t)((s)[i]-0x80))<=0x3f \
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) { \
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(c)=(((c)&0x1f)<<6)|__t1; \
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++(i); \
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} else { \
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/* function call for "complicated" and error cases */ \
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(c)=utf8_nextCharSafeBody((const uint8_t *)s, &(i), (length), c, -1); \
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} \
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} \
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}
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/**
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* Get a code point from a string at a code point boundary offset,
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* and advance the offset to the next code point boundary.
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* (Post-incrementing forward iteration.)
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* "Safe" macro, checks for illegal sequences and for string boundaries.
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*
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* The length can be negative for a NUL-terminated string.
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*
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* The offset may point to the lead byte of a multi-byte sequence,
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* in which case the macro will read the whole sequence.
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* If the offset points to a trail byte or an illegal UTF-8 sequence, then
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* c is set to U+FFFD.
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*
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* This macro does not distinguish between a real U+FFFD in the text
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* and U+FFFD returned for an ill-formed sequence.
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* Use U8_NEXT() if that distinction is important.
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*
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* @param s const uint8_t * string
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* @param i int32_t string offset, must be i<length
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* @param length int32_t string length
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* @param c output UChar32 variable, set to U+FFFD in case of an error
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* @see U8_NEXT
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* @stable ICU 51
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*/
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#define U8_NEXT_OR_FFFD(s, i, length, c) { \
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(c)=(uint8_t)(s)[(i)++]; \
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if((c)>=0x80) { \
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uint8_t __t1, __t2; \
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if( /* handle U+1000..U+CFFF inline */ \
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(0xe0<(c) && (c)<=0xec) && \
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(((i)+1)<(length) || (length)<0) && \
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(__t1=(uint8_t)((s)[i]-0x80))<=0x3f && \
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(__t2=(uint8_t)((s)[(i)+1]-0x80))<= 0x3f \
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) { \
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/* no need for (c&0xf) because the upper bits are truncated after <<12 in the cast to (UChar) */ \
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(c)=(UChar)(((c)<<12)|(__t1<<6)|__t2); \
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(i)+=2; \
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} else if( /* handle U+0080..U+07FF inline */ \
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((c)<0xe0 && (c)>=0xc2) && \
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((i)!=(length)) && \
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(__t1=(uint8_t)((s)[i]-0x80))<=0x3f \
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) { \
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(c)=(((c)&0x1f)<<6)|__t1; \
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++(i); \
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} else { \
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/* function call for "complicated" and error cases */ \
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(c)=utf8_nextCharSafeBody((const uint8_t *)s, &(i), (length), c, -3); \
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} \
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} \
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}
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/**
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* Append a code point to a string, overwriting 1 to 4 bytes.
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* The offset points to the current end of the string contents
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* and is advanced (post-increment).
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* "Unsafe" macro, assumes a valid code point and sufficient space in the string.
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* Otherwise, the result is undefined.
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*
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* @param s const uint8_t * string buffer
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* @param i string offset
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* @param c code point to append
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* @see U8_APPEND
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* @stable ICU 2.4
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*/
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#define U8_APPEND_UNSAFE(s, i, c) { \
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if((uint32_t)(c)<=0x7f) { \
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(s)[(i)++]=(uint8_t)(c); \
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} else { \
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if((uint32_t)(c)<=0x7ff) { \
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(s)[(i)++]=(uint8_t)(((c)>>6)|0xc0); \
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} else { \
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if((uint32_t)(c)<=0xffff) { \
|
|
(s)[(i)++]=(uint8_t)(((c)>>12)|0xe0); \
|
|
} else { \
|
|
(s)[(i)++]=(uint8_t)(((c)>>18)|0xf0); \
|
|
(s)[(i)++]=(uint8_t)((((c)>>12)&0x3f)|0x80); \
|
|
} \
|
|
(s)[(i)++]=(uint8_t)((((c)>>6)&0x3f)|0x80); \
|
|
} \
|
|
(s)[(i)++]=(uint8_t)(((c)&0x3f)|0x80); \
|
|
} \
|
|
}
|
|
|
|
/**
|
|
* 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) { \
|
|
if((uint32_t)(c)<=0x7f) { \
|
|
(s)[(i)++]=(uint8_t)(c); \
|
|
} else if((uint32_t)(c)<=0x7ff && (i)+1<(capacity)) { \
|
|
(s)[(i)++]=(uint8_t)(((c)>>6)|0xc0); \
|
|
(s)[(i)++]=(uint8_t)(((c)&0x3f)|0x80); \
|
|
} else if((uint32_t)(c)<=0xd7ff && (i)+2<(capacity)) { \
|
|
(s)[(i)++]=(uint8_t)(((c)>>12)|0xe0); \
|
|
(s)[(i)++]=(uint8_t)((((c)>>6)&0x3f)|0x80); \
|
|
(s)[(i)++]=(uint8_t)(((c)&0x3f)|0x80); \
|
|
} else { \
|
|
(i)=utf8_appendCharSafeBody(s, (i), (capacity), c, &(isError)); \
|
|
} \
|
|
}
|
|
|
|
/**
|
|
* 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) { \
|
|
(i)+=1+U8_COUNT_TRAIL_BYTES_UNSAFE((uint8_t)(s)[i]); \
|
|
}
|
|
|
|
/**
|
|
* 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) { \
|
|
uint8_t __b=(uint8_t)(s)[(i)++]; \
|
|
if(U8_IS_LEAD(__b)) { \
|
|
uint8_t __count=U8_COUNT_TRAIL_BYTES(__b); \
|
|
if((i)+__count>(length) && (length)>=0) { \
|
|
__count=(uint8_t)((length)-(i)); \
|
|
} \
|
|
while(__count>0 && U8_IS_TRAIL((s)[i])) { \
|
|
++(i); \
|
|
--__count; \
|
|
} \
|
|
} \
|
|
}
|
|
|
|
/**
|
|
* 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) { \
|
|
int32_t __N=(n); \
|
|
while(__N>0) { \
|
|
U8_FWD_1_UNSAFE(s, i); \
|
|
--__N; \
|
|
} \
|
|
}
|
|
|
|
/**
|
|
* 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) { \
|
|
int32_t __N=(n); \
|
|
while(__N>0 && ((i)<(length) || ((length)<0 && (s)[i]!=0))) { \
|
|
U8_FWD_1(s, i, length); \
|
|
--__N; \
|
|
} \
|
|
}
|
|
|
|
/**
|
|
* 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) { \
|
|
while(U8_IS_TRAIL((s)[i])) { --(i); } \
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* @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
|
|
* @stable ICU 2.4
|
|
*/
|
|
#define U8_SET_CP_START(s, start, i) { \
|
|
if(U8_IS_TRAIL((s)[(i)])) { \
|
|
(i)=utf8_back1SafeBody(s, start, (i)); \
|
|
} \
|
|
}
|
|
|
|
/* 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) { \
|
|
(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=(uint8_t)(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; \
|
|
} \
|
|
} \
|
|
} \
|
|
}
|
|
|
|
/**
|
|
* 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) { \
|
|
(c)=(uint8_t)(s)[--(i)]; \
|
|
if((c)>=0x80) { \
|
|
(c)=utf8_prevCharSafeBody((const uint8_t *)s, start, &(i), c, -1); \
|
|
} \
|
|
}
|
|
|
|
/**
|
|
* 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) { \
|
|
(c)=(uint8_t)(s)[--(i)]; \
|
|
if((c)>=0x80) { \
|
|
(c)=utf8_prevCharSafeBody((const uint8_t *)s, start, &(i), c, -3); \
|
|
} \
|
|
}
|
|
|
|
/**
|
|
* 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) { \
|
|
while(U8_IS_TRAIL((s)[--(i)])) {} \
|
|
}
|
|
|
|
/**
|
|
* 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) { \
|
|
if(U8_IS_TRAIL((s)[--(i)])) { \
|
|
(i)=utf8_back1SafeBody(s, start, (i)); \
|
|
} \
|
|
}
|
|
|
|
/**
|
|
* 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) { \
|
|
int32_t __N=(n); \
|
|
while(__N>0) { \
|
|
U8_BACK_1_UNSAFE(s, i); \
|
|
--__N; \
|
|
} \
|
|
}
|
|
|
|
/**
|
|
* 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) { \
|
|
int32_t __N=(n); \
|
|
while(__N>0 && (i)>(start)) { \
|
|
U8_BACK_1(s, start, i); \
|
|
--__N; \
|
|
} \
|
|
}
|
|
|
|
/**
|
|
* 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) { \
|
|
U8_BACK_1_UNSAFE(s, i); \
|
|
U8_FWD_1_UNSAFE(s, i); \
|
|
}
|
|
|
|
/**
|
|
* 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) { \
|
|
if((start)<(i) && ((i)<(length) || ((length)<0 && (s)[i]!=0))) { \
|
|
U8_BACK_1(s, start, i); \
|
|
U8_FWD_1(s, i, length); \
|
|
} \
|
|
}
|
|
|
|
#endif
|