460 lines
19 KiB
C
460 lines
19 KiB
C
/*
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*******************************************************************************
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*
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* Copyright (C) 1999-2000, 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: utf.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: 1999sep09
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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: UChar and UChar32 data types and UTF macros for C Unicode string handling
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*
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* <p>This file defines the UChar and UChar32 data types for Unicode code units
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* and code points, as well as macros for efficiently getting code points
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* in and out of a string.</p>
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*
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* <p>utf.h is included by utypes.h and itself includes the utfXX.h after some
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* common definitions. Those files define the macros for each UTF-size.</p>
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*
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* <p>ICU allows in principle to set which UTF (UTF-8/16/32) is used internally
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* by defining UTF_SIZE to either 8, 16, or 32. utf.h would then define the UChar type
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* accordingly. UTF-16 is the default.<br>
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* In praxis, since a lot of the ICU source code — especially low-level code like
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* conversion and collation — assumes UTF-16, utf.h enforces the default of UTF-16.
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* This is unlikely to change in the future. Only some files (like ubidi.h and most of unistr.h) should work with any UTF.</p>
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*
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* <p>Accordinly, utf.h defines UChar to be an unsigned 16-bit integer. If this matches wchar_t, then
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* UChar is defined to be exactly wchar_t, otherwise uint16_t.</p>
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*
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* <p>UChar32 is always defined to be a 32-bit integer to be large enough for a 21-bit
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* Unicode code point (Unicode scalar value, 0..0x10ffff). If wchar_t is a 32-bit type, then
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* UChar32 is defined to be exactly wchar_t, <em>regardless of whether wchar_t is signed or unsigned.
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* This means that UChar32 may be signed or unsigned depending on the platform!</em>
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* If wchar_t is not a 32-bit type, then UChar32 is defined to be uint32_t.</p>
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*
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* <p>utf.h also defines a number of C macros for handling single Unicode code points and
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* for using UTF Unicode strings. It includes utf8.h, utf16.h, and utf32.h for the actual
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* implementations of those macros and then aliases one set of them (for UTF-16) for general use.
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* The UTF-specific macros have the UTF size in the macro name prefixes (UTF16_...), while
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* the general alias macros always begin with UTF_...</p>
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*
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* <p>Many string operations can be done with or without error checking.
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* Where such a distinction is useful, there are two versions of the macros, "unsafe" and "safe"
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* ones with ..._UNSAFE and ..._SAFE suffixes. The unsafe macros are fast but may cause
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* program failures if the strings are not well-formed. The safe macros have an additional, boolean
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* parameter "strict". If strict is FALSE, then only illegal sequences are detected.
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* Otherwise, irregular sequences are detected as well (like single surrogates in UTF-8/32).
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* Safe macros return special error code points for illegal/irregular sequences:
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* Typically, U+ffff, or for UTF-8 values that would result in a byte sequence of the same length
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* as the illegal input sequence.<br>
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* Note that _UNSAFE macros have fewer parameters: They do not have the strictness parameter, and
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* they do not have start/length parameters for boundary checking.</p>
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*
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* <p>Here, the macros are aliased in two steps:
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* In the first step, the UTF-specific macros with UTF16_ prefix and _UNSAFE and _SAFE suffixes are
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* aliased according to the UTF_SIZE to macros with UTF_ prefix and the same suffixes and signatures.
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* Then, in a second step, the default, general alias macros are set to use either the unsafe or
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* the safe/not strict (default) or the safe/strict macro;
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* these general macros do not have a strictness parameter.</p>
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*
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* <p>It is possible to change the default choice for the general alias macros to be unsafe, safe/not strict or safe/strict.
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* The default is safe/not strict. It is not recommended to select the unsafe macros as the basis for
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* Unicode string handling in ICU! To select this, define UTF_SAFE, UTF_STRICT, or UTF_UNSAFE.</p>
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*
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* <p>For general use, one should use the default, general macros with UTF_ prefix and no _SAFE/_UNSAFE suffix.
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* Only in some cases it may be necessary to control the choice of macro directly and use a less generic alias.
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* For example, if it can be assumed that a string is well-formed and the index will stay within the bounds,
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* then the _UNSAFE version may be used.
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* If a UTF-8 string is to be processed, then the macros with UTF8_ prefixes need to be used.</p>
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*/
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#ifndef __UTF_H__
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#define __UTF_H__
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/*
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* ANSI C headers:
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* stddef.h defines wchar_t
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* limits.h defines CHAR_MAX
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*/
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#include <stddef.h>
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#include <limits.h>
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#include "unicode/umachine.h"
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/* include the utfXX.h after the following definitions */
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/* If there is no compiler option for the preferred UTF size, then default to UTF-16. */
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#ifndef UTF_SIZE
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/** Number of bits in a Unicode string code unit, same as x in UTF-x (8, 16, or 32). */
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# define UTF_SIZE 16
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#endif
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/** Number of bytes in a UChar (sizeof(UChar)). */
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#define U_SIZEOF_UCHAR (UTF_SIZE>>3)
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/*!
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* \def U_SIZEOF_WCHAR_T
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* Do we have wchar.h on this platform? It is there on most platforms.
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*/
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#ifndef U_HAVE_WCHAR_H
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# define U_HAVE_WCHAR_H 1
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#endif
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/* U_SIZEOF_WCHAR_T==sizeof(wchar_t) (0 means it is not defined or autoconf could not set it) */
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#if U_SIZEOF_WCHAR_T==0
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# undef U_SIZEOF_WCHAR_T
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/** U_SIZEOF_WCHAR_T==sizeof(wchar_t). */
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# define U_SIZEOF_WCHAR_T 4
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#endif
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/*!
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* \var UChar32
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* Define UChar32 to be wchar_t if that is 32 bits wide; may be signed or unsigned!
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* If wchar_t is not 32 bits wide, then define UChar32 to be uint32_t.
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*/
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#if U_SIZEOF_WCHAR_T==4
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typedef wchar_t UChar32;
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#else
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typedef uint32_t UChar32;
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#endif
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/**
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* Unicode string and array offset and index type.
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* ICU always counts Unicode code units (UChars) for string offsets, indexes, and lengths, not Unicode code points.
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*/
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typedef int32_t UTextOffset;
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/* Specify which macro versions are the default ones - safe or fast. */
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#if !defined(UTF_SAFE) && !defined(UTF_STRICT) && !defined(UTF_UNSAFE)
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/**
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* The default choice for general Unicode string macros is to use the ..._SAFE macro implementations
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* with strict=FALSE. See the utf.h file description.
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*/
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# define UTF_SAFE
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#endif
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/* internal definitions ----------------------------------------------------- */
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/**
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* <p>UTF8_ERROR_VALUE_1 and UTF8_ERROR_VALUE_2 are special error values for UTF-8,
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* which need 1 or 2 bytes in UTF-8:<br>
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* U+0015 = NAK = Negative Acknowledge, C0 control character<br>
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* U+009f = highest C1 control character</p>
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*
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* <p>These are used by ("safe") UTF-8 macros so that they can return an error value
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* that needs the same number of code units (bytes) as were seen by
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* a macro. They should be tested with UTF_IS_ERROR() or UTF_IS_VALID().</p>
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*
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* @internal
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*/
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#define UTF8_ERROR_VALUE_1 0x15
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#define UTF8_ERROR_VALUE_2 0x9f
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/**
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* Error value for all UTFs. This code point value will be set by macros with error
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* checking if an error is detected.
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*/
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#define UTF_ERROR_VALUE 0xffff
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/* single-code point definitions -------------------------------------------- */
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/** Is this code unit or code point a surrogate (U+d800..U+dfff)? */
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#define UTF_IS_SURROGATE(uchar) (((uchar)&0xfffff800)==0xd800)
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/**
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* Is a given 32-bit code point/Unicode scalar value
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* actually a valid Unicode (abstract) character?
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*/
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#define UTF_IS_UNICODE_CHAR(c) \
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((uint32_t)(c)<=0x10ffff && \
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!UTF_IS_SURROGATE(c) && ((c)&0xfffe)!=0xfffe)
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/**
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* Is a given 32-bit code an error value
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* as returned by one of the macros for any UTF?
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*/
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#define UTF_IS_ERROR(c) \
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(((c)&0xfffe)==0xfffe || (c)==UTF8_ERROR_VALUE_1 || (c)==UTF8_ERROR_VALUE_2)
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/** This is a combined macro: Is c a valid Unicode value _and_ not an error code? */
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#define UTF_IS_VALID(c) \
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((uint32_t)(c)<=0x10ffff && \
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!UTF_IS_SURROGATE(c) && \
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((c)&0xfffe)!=0xfffe && \
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(c)!=UTF8_ERROR_VALUE_1 && (c)!=UTF8_ERROR_VALUE_2)
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/* include the utfXX.h ------------------------------------------------------ */
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#include "unicode/utf8.h"
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#include "unicode/utf16.h"
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#include "unicode/utf32.h"
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/* Define types and macros according to the selected UTF size. -------------- */
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/*!
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* \var UChar
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* Define UChar to be wchar_t if that is 16 bits wide; always assumed to be unsigned.
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* If wchar_t is not 16 bits wide, then define UChar to be uint16_t.
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*/
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#if UTF_SIZE==8
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# error UTF-8 is not implemented, undefine UTF_SIZE or define it to 16
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/* Define UChar to be compatible with char if possible. */
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# if CHAR_MAX>=255
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typedef char UChar;
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# else
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typedef uint8_t UChar;
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# endif
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#elif UTF_SIZE==16
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/* Define UChar to be compatible with wchar_t if possible. */
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# if U_SIZEOF_WCHAR_T==2
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typedef wchar_t UChar;
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# else
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typedef uint16_t UChar;
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# endif
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/** Does this code unit alone encode a code point? */
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# define UTF_IS_SINGLE(uchar) UTF16_IS_SINGLE(uchar)
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/** Is this code unit the first one of several? */
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# define UTF_IS_LEAD(uchar) UTF16_IS_LEAD(uchar)
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/** Is this code unit one of several but not the first one? */
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# define UTF_IS_TRAIL(uchar) UTF16_IS_TRAIL(uchar)
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/** Does this code point require multiple code units? */
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# define UTF_NEED_MULTIPLE_UCHAR(c) UTF16_NEED_MULTIPLE_UCHAR(c)
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/** How many code units are used to encode this code point? */
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# define UTF_CHAR_LENGTH(c) UTF16_CHAR_LENGTH(c)
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/** How many code units are used at most for any Unicode code point? */
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# define UTF_MAX_CHAR_LENGTH UTF16_MAX_CHAR_LENGTH
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/** Estimate the number of code units for a string based on the number of UTF-16 code units. */
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# define UTF_ARRAY_SIZE(size) UTF16_ARRAY_SIZE(size)
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/** See file documentation and UTF_GET_CHAR. */
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# define UTF_GET_CHAR_UNSAFE(s, i, c) UTF16_GET_CHAR_UNSAFE(s, i, c)
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/** See file documentation and UTF_GET_CHAR. */
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# define UTF_GET_CHAR_SAFE(s, start, i, length, c, strict) UTF16_GET_CHAR_SAFE(s, start, i, length, c, strict)
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/** See file documentation and UTF_NEXT_CHAR. */
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# define UTF_NEXT_CHAR_UNSAFE(s, i, c) UTF16_NEXT_CHAR_UNSAFE(s, i, c)
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/** See file documentation and UTF_NEXT_CHAR. */
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# define UTF_NEXT_CHAR_SAFE(s, i, length, c, strict) UTF16_NEXT_CHAR_SAFE(s, i, length, c, strict)
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/** See file documentation and UTF_APPEND_CHAR. */
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# define UTF_APPEND_CHAR_UNSAFE(s, i, c) UTF16_APPEND_CHAR_UNSAFE(s, i, c)
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/** See file documentation and UTF_APPEND_CHAR. */
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# define UTF_APPEND_CHAR_SAFE(s, i, length, c) UTF16_APPEND_CHAR_SAFE(s, i, length, c)
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/** See file documentation and UTF_FWD_1. */
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# define UTF_FWD_1_UNSAFE(s, i) UTF16_FWD_1_UNSAFE(s, i)
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/** See file documentation and UTF_FWD_1. */
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# define UTF_FWD_1_SAFE(s, i, length) UTF16_FWD_1_SAFE(s, i, length)
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/** See file documentation and UTF_FWD_N. */
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# define UTF_FWD_N_UNSAFE(s, i, n) UTF16_FWD_N_UNSAFE(s, i, n)
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/** See file documentation and UTF_FWD_N. */
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# define UTF_FWD_N_SAFE(s, i, length, n) UTF16_FWD_N_SAFE(s, i, length, n)
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/** See file documentation and UTF_SET_CHAR_START. */
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# define UTF_SET_CHAR_START_UNSAFE(s, i) UTF16_SET_CHAR_START_UNSAFE(s, i)
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/** See file documentation and UTF_SET_CHAR_START. */
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# define UTF_SET_CHAR_START_SAFE(s, start, i) UTF16_SET_CHAR_START_SAFE(s, start, i)
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/** See file documentation and UTF_PREV_CHAR. */
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# define UTF_PREV_CHAR_UNSAFE(s, i, c) UTF16_PREV_CHAR_UNSAFE(s, i, c)
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/** See file documentation and UTF_PREV_CHAR. */
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# define UTF_PREV_CHAR_SAFE(s, start, i, c, strict) UTF16_PREV_CHAR_SAFE(s, start, i, c, strict)
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/** See file documentation and UTF_BACK_1. */
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# define UTF_BACK_1_UNSAFE(s, i) UTF16_BACK_1_UNSAFE(s, i)
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/** See file documentation and UTF_BACK_1. */
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# define UTF_BACK_1_SAFE(s, start, i) UTF16_BACK_1_SAFE(s, start, i)
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/** See file documentation and UTF_BACK_N. */
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# define UTF_BACK_N_UNSAFE(s, i, n) UTF16_BACK_N_UNSAFE(s, i, n)
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/** See file documentation and UTF_BACK_N. */
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# define UTF_BACK_N_SAFE(s, start, i, n) UTF16_BACK_N_SAFE(s, start, i, n)
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/** See file documentation and UTF_SET_CHAR_LIMIT. */
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# define UTF_SET_CHAR_LIMIT_UNSAFE(s, i) UTF16_SET_CHAR_LIMIT_UNSAFE(s, i)
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/** See file documentation and UTF_SET_CHAR_LIMIT. */
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# define UTF_SET_CHAR_LIMIT_SAFE(s, start, i, length) UTF16_SET_CHAR_LIMIT_SAFE(s, start, i, length)
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#elif UTF_SIZE==32
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# error UTF-32 is not implemented, undefine UTF_SIZE or define it to 16
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typedef UChar32 UChar;
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#else
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# error UTF_SIZE must be undefined or one of { 8, 16, 32 } - only 16 is implemented
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#endif
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/* Define the default macros for handling UTF characters. ------------------- */
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/**
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* \def UTF_GET_CHAR(s, start, i, length, c)
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*
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* Set c to the code point that contains the code unit i.
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* i could point to the first, the last, or an intermediate code unit.
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* i is not modified.
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* \pre 0<=i<length
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*/
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/**
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* \def UTF_NEXT_CHAR(s, i, length, c)
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*
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* Set c to the code point that starts at code unit i
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* and advance i to beyond the code units of this code point (post-increment).
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* i must point to the first code unit of a code point.
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* \pre 0<=i<length
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* \post 0<i<=length
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*/
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/**
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* \def UTF_APPEND_CHAR(s, i, length, c)
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*
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* Append the code units of code point c to the string at index i
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* and advance i to beyond the new code units (post-increment).
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* The code units beginning at index i will be overwritten.
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* \pre 0<=c<=0x10ffff
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* \pre 0<=i<length
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* \post 0<i<=length
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*/
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/**
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* \def UTF_FWD_1(s, i, length)
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*
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* Advance i to beyond the code units of the code point that begins at i.
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* I.e., advance i by one code point.
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* i must point to the first code unit of a code point.
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* \pre 0<=i<length
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* \post 0<i<=length
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*/
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/**
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* \def UTF_FWD_N(s, i, length, n)
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*
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* Advance i to beyond the code units of the n code points where the first one begins at i.
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* I.e., advance i by n code points.
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* i must point to the first code unit of a code point.
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* \pre 0<=i<length
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* \post 0<i<=length
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*/
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/**
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* \def UTF_SET_CHAR_START(s, start, i)
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*
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* Take the random-access index i and adjust it so that it points to the beginning
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* of a code point.
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* The input index points to any code unit of a code point and is moved to point to
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* the first code unit of the same code point. i is never incremented.
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* This can be used to start an iteration with UTF_NEXT_CHAR() from a random index.
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* \pre start<=i<length
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* \post start<=i<length
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*/
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/**
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* \def UTF_PREV_CHAR(s, start, i, c)
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*
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* Set c to the code point that has code units before i
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* and move i backward (towards the beginning of the string)
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* to the first code unit of this code point (pre-increment).
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* i must point to the first code unit after the last unit of a code point (i==length is allowed).
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* \pre start<i<=length
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* \post start<=i<length
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*/
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/**
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* \def UTF_BACK_1(s, start, i)
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*
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* Move i backward (towards the beginning of the string)
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* to the first code unit of the code point that has code units before i.
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* I.e., move i backward by one code point.
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* i must point to the first code unit after the last unit of a code point (i==length is allowed).
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* \pre start<i<=length
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* \post start<=i<length
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*/
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/**
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* \def UTF_BACK_N(s, start, i, n)
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*
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* Move i backward (towards the beginning of the string)
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* to the first code unit of the n code points that have code units before i.
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* I.e., move i backward by n code points.
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* i must point to the first code unit after the last unit of a code point (i==length is allowed).
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* \pre start<i<=length
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* \post start<=i<length
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*/
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/**
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* \def UTF_SET_CHAR_LIMIT(s, start, i, length)
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*
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* Take the random-access index i and adjust it so that it points beyond
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* a code point. The input index points beyond any code unit
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* of a code point and is moved to point beyond the last code unit of the same
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* code point. i is never decremented.
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* This can be used to start an iteration with UTF_PREV_CHAR() from a random index.
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* \pre start<i<=length
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* \post start<i<=length
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*/
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#ifdef UTF_SAFE
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# define UTF_GET_CHAR(s, start, i, length, c) UTF_GET_CHAR_SAFE(s, start, i, length, c, FALSE)
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# define UTF_NEXT_CHAR(s, i, length, c) UTF_NEXT_CHAR_SAFE(s, i, length, c, FALSE)
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# define UTF_APPEND_CHAR(s, i, length, c) UTF_APPEND_CHAR_SAFE(s, i, length, c)
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# define UTF_FWD_1(s, i, length) UTF_FWD_1_SAFE(s, i, length)
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# define UTF_FWD_N(s, i, length, n) UTF_FWD_N_SAFE(s, i, length, n)
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# define UTF_SET_CHAR_START(s, start, i) UTF_SET_CHAR_START_SAFE(s, start, i)
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# define UTF_PREV_CHAR(s, start, i, c) UTF_PREV_CHAR_SAFE(s, start, i, c, FALSE)
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# define UTF_BACK_1(s, start, i) UTF_BACK_1_SAFE(s, start, i)
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# define UTF_BACK_N(s, start, i, n) UTF_BACK_N_SAFE(s, start, i, n)
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# define UTF_SET_CHAR_LIMIT(s, start, i, length) UTF_SET_CHAR_LIMIT_SAFE(s, start, i, length)
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#elif defined(UTF_STRICT)
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# define UTF_GET_CHAR(s, start, i, length, c) UTF_GET_CHAR_SAFE(s, start, i, length, c, TRUE)
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# define UTF_NEXT_CHAR(s, i, length, c) UTF_NEXT_CHAR_SAFE(s, i, length, c, TRUE)
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# define UTF_APPEND_CHAR(s, i, length, c) UTF_APPEND_CHAR_SAFE(s, i, length, c)
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# define UTF_FWD_1(s, i, length) UTF_FWD_1_SAFE(s, i, length)
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# define UTF_FWD_N(s, i, length, n) UTF_FWD_N_SAFE(s, i, length, n)
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# define UTF_SET_CHAR_START(s, start, i) UTF_SET_CHAR_START_SAFE(s, start, i)
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# define UTF_PREV_CHAR(s, start, i, c) UTF_PREV_CHAR_SAFE(s, start, i, c, TRUE)
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# define UTF_BACK_1(s, start, i) UTF_BACK_1_SAFE(s, start, i)
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# define UTF_BACK_N(s, start, i, n) UTF_BACK_N_SAFE(s, start, i, n)
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# define UTF_SET_CHAR_LIMIT(s, start, i, length) UTF_SET_CHAR_LIMIT_SAFE(s, start, i, length)
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#else /* UTF_UNSAFE */
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# define UTF_GET_CHAR(s, start, i, length, c) UTF_GET_CHAR_UNSAFE(s, i, c)
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# define UTF_NEXT_CHAR(s, i, length, c) UTF_NEXT_CHAR_UNSAFE(s, i, c)
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# define UTF_APPEND_CHAR(s, i, length, c) UTF_APPEND_CHAR_UNSAFE(s, i, c)
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# define UTF_FWD_1(s, i, length) UTF_FWD_1_UNSAFE(s, i)
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# define UTF_FWD_N(s, i, length, n) UTF_FWD_N_UNSAFE(s, i, n)
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# define UTF_SET_CHAR_START(s, start, i) UTF_SET_CHAR_START_UNSAFE(s, i)
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# define UTF_PREV_CHAR(s, start, i, c) UTF_PREV_CHAR_UNSAFE(s, i, c)
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# define UTF_BACK_1(s, start, i) UTF_BACK_1_UNSAFE(s, i)
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# define UTF_BACK_N(s, start, i, n) UTF_BACK_N_UNSAFE(s, i, n)
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# define UTF_SET_CHAR_LIMIT(s, start, i, length) UTF_SET_CHAR_LIMIT_UNSAFE(s, i)
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#endif
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#endif
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