159 lines
3.7 KiB
C
159 lines
3.7 KiB
C
/*
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*******************************************************************************
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*
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* Copyright (C) 1999-2001, 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: utf32.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: 1999sep20
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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: UTF-32 macros
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*
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* This file defines macros to deal with UTF-32 code units and code points.
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* Signatures and semantics are the same as for the similarly named macros
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* in utf16.h.
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* utf32.h is included by utf.h after unicode/umachine.h</p>
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* and some common definitions.
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* <p><b>Usage:</b> 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.</p>
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*/
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#ifndef __UTF32_H__
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#define __UTF32_H__
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/* internal definitions ----------------------------------------------------- */
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#define UTF32_IS_SAFE(c, strict) \
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((uint32_t)(c)<=0x10ffff && \
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(!(strict) || !UTF_IS_SURROGATE(c) && ((c)&0xfffe)!=0xfffe))
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/*
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* For the semantics of all of these macros, see utf16.h.
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* The UTF-32 versions are trivial because any code point is
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* encoded using exactly one code unit.
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*/
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/* single-code point definitions -------------------------------------------- */
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/* classes of code unit values */
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#define UTF32_IS_SINGLE(uchar) 1
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#define UTF32_IS_LEAD(uchar) 0
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#define UTF32_IS_TRAIL(uchar) 0
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/* number of code units per code point */
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#define UTF32_NEED_MULTIPLE_UCHAR(c) 0
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#define UTF32_CHAR_LENGTH(c) 1
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#define UTF32_MAX_CHAR_LENGTH 1
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/* average number of code units compared to UTF-16 */
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#define UTF32_ARRAY_SIZE(size) (size)
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#define UTF32_GET_CHAR_UNSAFE(s, i, c) { \
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(c)=(s)[i]; \
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}
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#define UTF32_GET_CHAR_SAFE(s, start, i, length, c, strict) { \
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(c)=(s)[i]; \
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if(!UTF32_IS_SAFE(c, strict)) { \
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(c)=UTF_ERROR_VALUE; \
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} \
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}
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/* definitions with forward iteration --------------------------------------- */
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#define UTF32_NEXT_CHAR_UNSAFE(s, i, c) { \
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(c)=(s)[(i)++]; \
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}
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#define UTF32_APPEND_CHAR_UNSAFE(s, i, c) { \
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(s)[(i)++]=(c); \
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}
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#define UTF32_FWD_1_UNSAFE(s, i) { \
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++(i); \
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}
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#define UTF32_FWD_N_UNSAFE(s, i, n) { \
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(i)+=(n); \
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}
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#define UTF32_SET_CHAR_START_UNSAFE(s, i) { \
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}
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#define UTF32_NEXT_CHAR_SAFE(s, i, length, c, strict) { \
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(c)=(s)[(i)++]; \
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if(!UTF32_IS_SAFE(c, strict)) { \
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(c)=UTF_ERROR_VALUE; \
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} \
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}
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#define UTF32_APPEND_CHAR_SAFE(s, i, length, c) { \
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if((uint32_t)(c)<=0x10ffff) { \
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(s)[(i)++]=(c); \
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} else /* c>0x10ffff, write 0xfffd */ { \
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(s)[(i)++]=0xfffd; \
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} \
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}
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#define UTF32_FWD_1_SAFE(s, i, length) { \
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++(i); \
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}
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#define UTF32_FWD_N_SAFE(s, i, length, n) { \
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if(((i)+=(n))>(length)) { \
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(i)=(length); \
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} \
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}
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#define UTF32_SET_CHAR_START_SAFE(s, start, i) { \
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}
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/* definitions with backward iteration -------------------------------------- */
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#define UTF32_PREV_CHAR_UNSAFE(s, i, c) { \
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(c)=(s)[--(i)]; \
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}
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#define UTF32_BACK_1_UNSAFE(s, i) { \
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--(i); \
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}
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#define UTF32_BACK_N_UNSAFE(s, i, n) { \
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(i)-=(n); \
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}
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#define UTF32_SET_CHAR_LIMIT_UNSAFE(s, i) { \
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}
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#define UTF32_PREV_CHAR_SAFE(s, start, i, c, strict) { \
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(c)=(s)[--(i)]; \
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if(!UTF32_IS_SAFE(c, strict)) { \
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(c)=UTF_ERROR_VALUE; \
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} \
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}
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#define UTF32_BACK_1_SAFE(s, start, i) { \
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--(i); \
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}
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#define UTF32_BACK_N_SAFE(s, start, i, n) { \
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(i)-=(n); \
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if((i)<(start)) { \
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(i)=(start); \
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} \
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}
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#define UTF32_SET_CHAR_LIMIT_SAFE(s, i, length) { \
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}
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#endif
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