From 0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 03:47:29 +0200 Subject: Adding upstream version 115.8.0esr. Signed-off-by: Daniel Baumann --- intl/icu/source/common/unicode/utf8.h | 882 ++++++++++++++++++++++++++++++++++ 1 file changed, 882 insertions(+) create mode 100644 intl/icu/source/common/unicode/utf8.h (limited to 'intl/icu/source/common/unicode/utf8.h') diff --git a/intl/icu/source/common/unicode/utf8.h b/intl/icu/source/common/unicode/utf8.h new file mode 100644 index 0000000000..5a07435fcf --- /dev/null +++ b/intl/icu/source/common/unicode/utf8.h @@ -0,0 +1,882 @@ +// © 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 + * (https://unicode-org.github.io/icu/userguide/strings). + * + * Usage: + * 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 +#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 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_CAPI 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 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_CAPI 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 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_CAPI 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 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_CAPI 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=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>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=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 i0 && ((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 start0) { \ + 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 start0 && (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 -- cgit v1.2.3