text:
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
*
*   Copyright (C) 2002-2012, International Business Machines
*   Corporation and others.  All Rights Reserved.
*
*******************************************************************************
*   file name:  utf_old.h
*   encoding:   UTF-8
*   tab size:   8 (not used)
*   indentation:4
*
*   created on: 2002sep21
*   created by: Markus W. Scherer
*/

/**
 * \file
 * \brief C API: Deprecated macros for Unicode string handling
 *
 * The macros in utf_old.h are all deprecated and their use discouraged.
 * Some of the design principles behind the set of UTF macros
 * have changed or proved impractical.
 * Almost all of the old "UTF macros" are at least renamed.
 * If you are looking for a new equivalent to an old macro, please see the
 * comment at the old one.
 *
 * Brief summary of reasons for deprecation:
 * - Switch on UTF_SIZE (selection of UTF-8/16/32 default string processing)
 *   was impractical.
 * - Switch on UTF_SAFE etc. (selection of unsafe/safe/strict default string processing)
 *   was of little use and impractical.
 * - Whole classes of macros became obsolete outside of the UTF_SIZE/UTF_SAFE
 *   selection framework: UTF32_ macros (all trivial)
 *   and UTF_ default and intermediate macros (all aliases).
 * - The selection framework also caused many macro aliases.
 * - Change in Unicode standard: "irregular" sequences (3.0) became illegal (3.2).
 * - Change of language in Unicode standard:
 *   Growing distinction between internal x-bit Unicode strings and external UTF-x
 *   forms, with the former more lenient.
 *   Suggests renaming of UTF16_ macros to U16_.
 * - The prefix "UTF_" without a width number confused some users.
 * - "Safe" append macros needed the addition of an error indicator output.
 * - "Safe" UTF-8 macros used legitimate (if rarely used) code point values
 *   to indicate error conditions.
 * - The use of the "_CHAR" infix for code point operations confused some users.
 *
 * More details:
 *
 * Until ICU 2.2, utf.h theoretically allowed to choose among UTF-8/16/32
 * for string processing, and among unsafe/safe/strict default macros for that.
 *
 * It proved nearly impossible to write non-trivial, high-performance code
 * that is UTF-generic.
 * Unsafe default macros would be dangerous for default string processing,
 * and the main reason for the "strict" versions disappeared:
 * Between Unicode 3.0 and 3.2 all "irregular" UTF-8 sequences became illegal.
 * The only other conditions that "strict" checked for were non-characters,
 * which are valid during processing. Only during text input/output should they
 * be checked, and at that time other well-formedness checks may be
 * necessary or useful as well.
 * This can still be done by using U16_NEXT and U_IS_UNICODE_NONCHAR
 * or U_IS_UNICODE_CHAR.
 *
 * The old UTF8_..._SAFE macros also used some normal Unicode code points
 * to indicate malformed sequences.
 * The new UTF8_ macros without suffix use negative values instead.
 *
 * The entire contents of utf32.h was moved here without replacement
 * because all those macros were trivial and
 * were meaningful only in the framework of choosing the UTF size.
 *
 * See Jitterbug 2150 and its discussion on the ICU mailing list
 * in September 2002.
 *
 *

 *
 * Obsolete part of pre-ICU 2.4 utf.h file documentation:
 *
 *
The original concept for these files was for ICU to allow
 * in principle to set which UTF (UTF-8/16/32) is used internally
 * by defining UTF_SIZE to either 8, 16, or 32. utf.h would then define the UChar type
 * accordingly. UTF-16 was the default.

 *
 *
This concept has been abandoned.
 * A lot of the ICU source code assumes UChar strings are in UTF-16.
 * This is especially true for low-level code like
 * conversion, normalization, and collation.
 * The utf.h header enforces the default of UTF-16.
 * The UTF-8 and UTF-32 macros remain for now for completeness and backward compatibility.

 *
 *
Accordingly, utf.h defines UChar to be an unsigned 16-bit integer. If this matches wchar_t, then
 * UChar is defined to be exactly wchar_t, otherwise uint16_t.

 *
 *
UChar32 is defined to be a signed 32-bit integer (int32_t), large enough for a 21-bit
 * Unicode code point (Unicode scalar value, 0..0x10ffff).
 * Before ICU 2.4, the definition of UChar32 was similarly platform-dependent as
 * the definition of UChar. For details see the documentation for UChar32 itself.

 *
 *
utf.h also defines a number of C macros for handling single Unicode code points and
 * for using UTF Unicode strings. It includes utf8.h, utf16.h, and utf32.h for the actual
 * implementations of those macros and then aliases one set of them (for UTF-16) for general use.
 * The UTF-specific macros have the UTF size in the macro name prefixes (UTF16_...), while
 * the general alias macros always begin with UTF_...

 *
 *
Many string operations can be done with or without error checking.
 * Where such a distinction is useful, there are two versions of the macros, "unsafe" and "safe"
 * ones with ..._UNSAFE and ..._SAFE suffixes. The unsafe macros are fast but may cause
 * program failures if the strings are not well-formed. The safe macros have an additional, boolean
 * parameter "strict". If strict is FALSE, then only illegal sequences are detected.
 * Otherwise, irregular sequences and non-characters are detected as well (like single surrogates).
 * Safe macros return special error code points for illegal/irregular sequences:
 * Typically, U+ffff, or values that would result in a code unit sequence of the same length
 * as the erroneous input sequence.

 * Note that _UNSAFE macros have fewer parameters: They do not have the strictness parameter, and
 * they do not have start/length parameters for boundary checking.

 *
 *
Here, the macros are aliased in two steps:
 * In the first step, the UTF-specific macros with UTF16_ prefix and _UNSAFE and _SAFE suffixes are
 * aliased according to the UTF_SIZE to macros with UTF_ prefix and the same suffixes and signatures.
 * Then, in a second step, the default, general alias macros are set to use either the unsafe or
 * the safe/not strict (default) or the safe/strict macro;
 * these general macros do not have a strictness parameter.

 *
 *
It is possible to change the default choice for the general alias macros to be unsafe, safe/not strict or safe/strict.
 * The default is safe/not strict. It is not recommended to select the unsafe macros as the basis for
 * Unicode string handling in ICU! To select this, define UTF_SAFE, UTF_STRICT, or UTF_UNSAFE.

 *
 *
For general use, one should use the default, general macros with UTF_ prefix and no _SAFE/_UNSAFE suffix.
 * Only in some cases it may be necessary to control the choice of macro directly and use a less generic alias.
 * For example, if it can be assumed that a string is well-formed and the index will stay within the bounds,
 * then the _UNSAFE version may be used.
 * If a UTF-8 string is to be processed, then the macros with UTF8_ prefixes need to be used.

 *
 *

 *
 * Deprecated ICU 2.4. Use the macros in utf.h, utf16.h, utf8.h instead.
 */

#ifndef __UTF_OLD_H__
#define __UTF_OLD_H__

#include "unicode/utf.h"
#include "unicode/utf8.h"
#include "unicode/utf16.h"

/**
 * \def U_HIDE_OBSOLETE_UTF_OLD_H
 *
 * Hides the obsolete definitions in unicode/utf_old.h.
 * Recommended to be set to 1 at compile time to make sure
 * the long-deprecated macros are no longer used.
 *
 * For reasons for the deprecation see the utf_old.h file comments.
 *
 * @internal
 */
#ifndef U_HIDE_OBSOLETE_UTF_OLD_H
#   define U_HIDE_OBSOLETE_UTF_OLD_H 0
#endif

#if !defined(U_HIDE_DEPRECATED_API) && !U_HIDE_OBSOLETE_UTF_OLD_H

/* Formerly utf.h, part 1 --------------------------------------------------- */

#ifdef U_USE_UTF_DEPRECATES
/**
 * Unicode string and array offset and index type.
 * ICU always counts Unicode code units (UChars) for
 * string offsets, indexes, and lengths, not Unicode code points.
 *
 * @obsolete ICU 2.6. Use int32_t directly instead since this API will be removed in that release.
 */
typedef int32_t UTextOffset;
#endif

/** Number of bits in a Unicode string code unit - ICU uses 16-bit Unicode. @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF_SIZE 16

/**
 * The default choice for general Unicode string macros is to use the ..._SAFE macro implementations
 * with strict=FALSE.
 *
 * @deprecated ICU 2.4. Obsolete, see utf_old.h.
 */
#define UTF_SAFE
/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#undef UTF_UNSAFE
/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#undef UTF_STRICT

/**
 * UTF8_ERROR_VALUE_1 and UTF8_ERROR_VALUE_2 are special error values for UTF-8,
 * which need 1 or 2 bytes in UTF-8:
 * \code
 * U+0015 = NAK = Negative Acknowledge, C0 control character
 * U+009f = highest C1 control character
 * \endcode
 *
 * These are used by UTF8_..._SAFE macros so that they can return an error value
 * that needs the same number of code units (bytes) as were seen by
 * a macro. They should be tested with UTF_IS_ERROR() or UTF_IS_VALID().
 *
 * @deprecated ICU 2.4. Obsolete, see utf_old.h.
 */
#define UTF8_ERROR_VALUE_1 0x15

/**
 * See documentation on UTF8_ERROR_VALUE_1 for details.
 *
 * @deprecated ICU 2.4. Obsolete, see utf_old.h.
 */
#define UTF8_ERROR_VALUE_2 0x9f

/**
 * Error value for all UTFs. This code point value will be set by macros with error
 * checking if an error is detected.
 *
 * @deprecated ICU 2.4. Obsolete, see utf_old.h.
 */
#define UTF_ERROR_VALUE 0xffff

/**
 * Is a given 32-bit code an error value
 * as returned by one of the macros for any UTF?
 *
 * @deprecated ICU 2.4. Obsolete, see utf_old.h.
 */
#define UTF_IS_ERROR(c) \
    (((c)&0xfffe)==0xfffe || (c)==UTF8_ERROR_VALUE_1 || (c)==UTF8_ERROR_VALUE_2)

/**
 * This is a combined macro: Is c a valid Unicode value _and_ not an error code?
 *
 * @deprecated ICU 2.4. Obsolete, see utf_old.h.
 */
#define UTF_IS_VALID(c) \
    (UTF_IS_UNICODE_CHAR(c) && \
     (c)!=UTF8_ERROR_VALUE_1 && (c)!=UTF8_ERROR_VALUE_2)

/**
 * Is this code unit or code point a surrogate (U+d800..U+dfff)?
 * @deprecated ICU 2.4. Renamed to U_IS_SURROGATE and U16_IS_SURROGATE, see utf_old.h.
 */
#define UTF_IS_SURROGATE(uchar) (((uchar)&0xfffff800)==0xd800)

/**
 * Is a given 32-bit code point a Unicode noncharacter?
 *
 * @deprecated ICU 2.4. Renamed to U_IS_UNICODE_NONCHAR, see utf_old.h.
 */
#define UTF_IS_UNICODE_NONCHAR(c) \
    ((c)>=0xfdd0 && \
     ((uint32_t)(c)<=0xfdef || ((c)&0xfffe)==0xfffe) && \
     (uint32_t)(c)<=0x10ffff)

/**
 * Is a given 32-bit value a Unicode code point value (0..U+10ffff)
 * that can be assigned a character?
 *
 * Code points that are not characters include:
 * - single surrogate code points (U+d800..U+dfff, 2048 code points)
 * - the last two code points on each plane (U+__fffe and U+__ffff, 34 code points)
 * - U+fdd0..U+fdef (new with Unicode 3.1, 32 code points)
 * - the highest Unicode code point value is U+10ffff
 *
 * This means that all code points below U+d800 are character code points,
 * and that boundary is tested first for performance.
 *
 * @deprecated ICU 2.4. Renamed to U_IS_UNICODE_CHAR, see utf_old.h.
 */
#define UTF_IS_UNICODE_CHAR(c) \
    ((uint32_t)(c)<0xd800 || \
        ((uint32_t)(c)>0xdfff && \
         (uint32_t)(c)<=0x10ffff && \
         !UTF_IS_UNICODE_NONCHAR(c)))

/* Formerly utf8.h ---------------------------------------------------------- */

/**
* \var utf8_countTrailBytes
* Internal array with numbers of trail bytes for any given byte used in
* lead byte position.
*
* 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
*/
#ifdef U_UTF8_IMPL
// No forward declaration if compiling utf_impl.cpp, which defines utf8_countTrailBytes.
#elif defined(U_STATIC_IMPLEMENTATION) || defined(U_COMMON_IMPLEMENTATION)
U_CFUNC const uint8_t utf8_countTrailBytes[];
#else
U_CFUNC U_IMPORT const uint8_t utf8_countTrailBytes[];    /* U_IMPORT2? */ /*U_IMPORT*/
#endif

/**
 * Count the trail bytes for a UTF-8 lead byte.
 * @deprecated ICU 2.4. Renamed to U8_COUNT_TRAIL_BYTES, see utf_old.h.
 */
#define UTF8_COUNT_TRAIL_BYTES(leadByte) (utf8_countTrailBytes[(uint8_t)leadByte])

/**
 * Mask a UTF-8 lead byte, leave only the lower bits that form part of the code point value.
 * @deprecated ICU 2.4. Renamed to U8_MASK_LEAD_BYTE, see utf_old.h.
 */
#define UTF8_MASK_LEAD_BYTE(leadByte, countTrailBytes) ((leadByte)&=(1<<(6-(countTrailBytes)))-1)

/** Is this this code point a single code unit (byte)? @deprecated ICU 2.4. Renamed to U8_IS_SINGLE, see utf_old.h. */
#define UTF8_IS_SINGLE(uchar) (((uchar)&0x80)==0)
/** Is this this code unit the lead code unit (byte) of a code point? @deprecated ICU 2.4. Renamed to U8_IS_LEAD, see utf_old.h. */
#define UTF8_IS_LEAD(uchar) ((uint8_t)((uchar)-0xc0)<0x3e)
/** Is this this code unit a trailing code unit (byte) of a code point? @deprecated ICU 2.4. Renamed to U8_IS_TRAIL, see utf_old.h. */
#define UTF8_IS_TRAIL(uchar) (((uchar)&0xc0)==0x80)

/** Does this scalar Unicode value need multiple code units for storage? @deprecated ICU 2.4. Use U8_LENGTH or test ((uint32_t)(c)>0x7f) instead, see utf_old.h. */
#define UTF8_NEED_MULTIPLE_UCHAR(c) ((uint32_t)(c)>0x7f)

/**
 * Given the lead character, how many bytes are taken by this code point.
 * ICU does not deal with code points >0x10ffff
 * unless necessary for advancing in the byte stream.
 *
 * These length macros take into account that for values >0x10ffff
 * the UTF8_APPEND_CHAR_SAFE macros would write the error code point 0xffff
 * with 3 bytes.
 * Code point comparisons need to be in uint32_t because UChar32
 * may be a signed type, and negative values must be recognized.
 *
 * @deprecated ICU 2.4. Use U8_LENGTH instead, see utf.h.
 */
#if 1
#   define UTF8_CHAR_LENGTH(c) \
        ((uint32_t)(c)<=0x7f ? 1 : \
            ((uint32_t)(c)<=0x7ff ? 2 : \
                ((uint32_t)((c)-0x10000)>0xfffff ? 3 : 4) \
            ) \
        )
#else
#   define UTF8_CHAR_LENGTH(c) \
        ((uint32_t)(c)<=0x7f ? 1 : \
            ((uint32_t)(c)<=0x7ff ? 2 : \
                ((uint32_t)(c)<=0xffff ? 3 : \
                    ((uint32_t)(c)<=0x10ffff ? 4 : \
                        ((uint32_t)(c)<=0x3ffffff ? 5 : \
                            ((uint32_t)(c)<=0x7fffffff ? 6 : 3) \
                        ) \
                    ) \
                ) \
            ) \
        )
#endif

/** The maximum number of bytes per code point. @deprecated ICU 2.4. Renamed to U8_MAX_LENGTH, see utf_old.h. */
#define UTF8_MAX_CHAR_LENGTH 4

/** Average number of code units compared to UTF-16. @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF8_ARRAY_SIZE(size) ((5*(size))/2)

/** @deprecated ICU 2.4. Renamed to U8_GET_UNSAFE, see utf_old.h. */
#define UTF8_GET_CHAR_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \
    int32_t _utf8_get_char_unsafe_index=(int32_t)(i); \
    UTF8_SET_CHAR_START_UNSAFE(s, _utf8_get_char_unsafe_index); \
    UTF8_NEXT_CHAR_UNSAFE(s, _utf8_get_char_unsafe_index, c); \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Use U8_GET instead, see utf_old.h. */
#define UTF8_GET_CHAR_SAFE(s, start, i, length, c, strict) UPRV_BLOCK_MACRO_BEGIN { \
    int32_t _utf8_get_char_safe_index=(int32_t)(i); \
    UTF8_SET_CHAR_START_SAFE(s, start, _utf8_get_char_safe_index); \
    UTF8_NEXT_CHAR_SAFE(s, _utf8_get_char_safe_index, length, c, strict); \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Renamed to U8_NEXT_UNSAFE, see utf_old.h. */
#define UTF8_NEXT_CHAR_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \
    (c)=(s)[(i)++]; \
    if((uint8_t)((c)-0xc0)<0x35) { \
        uint8_t __count=UTF8_COUNT_TRAIL_BYTES(c); \
        UTF8_MASK_LEAD_BYTE(c, __count); \
        switch(__count) { \
        /* each following branch falls through to the next one */ \
        case 3: \
            (c)=((c)<<6)|((s)[(i)++]&0x3f); \
        case 2: \
            (c)=((c)<<6)|((s)[(i)++]&0x3f); \
        case 1: \
            (c)=((c)<<6)|((s)[(i)++]&0x3f); \
        /* no other branches to optimize switch() */ \
            break; \
        } \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Renamed to U8_APPEND_UNSAFE, see utf_old.h. */
#define UTF8_APPEND_CHAR_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \
    if((uint32_t)(c)<=0x7f) { \
        (s)[(i)++]=(uint8_t)(c); \
    } else { \
        if((uint32_t)(c)<=0x7ff) { \
            (s)[(i)++]=(uint8_t)(((c)>>6)|0xc0); \
        } else { \
            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); \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Renamed to U8_FWD_1_UNSAFE, see utf_old.h. */
#define UTF8_FWD_1_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \
    (i)+=1+UTF8_COUNT_TRAIL_BYTES((s)[i]); \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Renamed to U8_FWD_N_UNSAFE, see utf_old.h. */
#define UTF8_FWD_N_UNSAFE(s, i, n) UPRV_BLOCK_MACRO_BEGIN { \
    int32_t __N=(n); \
    while(__N>0) { \
        UTF8_FWD_1_UNSAFE(s, i); \
        --__N; \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Renamed to U8_SET_CP_START_UNSAFE, see utf_old.h. */
#define UTF8_SET_CHAR_START_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \
    while(UTF8_IS_TRAIL((s)[i])) { --(i); } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Use U8_NEXT instead, see utf_old.h. */
#define UTF8_NEXT_CHAR_SAFE(s, i, length, c, strict) UPRV_BLOCK_MACRO_BEGIN { \
    (c)=(s)[(i)++]; \
    if((c)>=0x80) { \
        if(UTF8_IS_LEAD(c)) { \
            (c)=utf8_nextCharSafeBody(s, &(i), (int32_t)(length), c, strict); \
        } else { \
            (c)=UTF8_ERROR_VALUE_1; \
        } \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Use U8_APPEND instead, see utf_old.h. */
#define UTF8_APPEND_CHAR_SAFE(s, i, length, c)  UPRV_BLOCK_MACRO_BEGIN { \
    if((uint32_t)(c)<=0x7f) { \
        (s)[(i)++]=(uint8_t)(c); \
    } else { \
        (i)=utf8_appendCharSafeBody(s, (int32_t)(i), (int32_t)(length), c, NULL); \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Renamed to U8_FWD_1, see utf_old.h. */
#define UTF8_FWD_1_SAFE(s, i, length) U8_FWD_1(s, i, length)

/** @deprecated ICU 2.4. Renamed to U8_FWD_N, see utf_old.h. */
#define UTF8_FWD_N_SAFE(s, i, length, n) U8_FWD_N(s, i, length, n)

/** @deprecated ICU 2.4. Renamed to U8_SET_CP_START, see utf_old.h. */
#define UTF8_SET_CHAR_START_SAFE(s, start, i) U8_SET_CP_START(s, start, i)

/** @deprecated ICU 2.4. Renamed to U8_PREV_UNSAFE, see utf_old.h. */
#define UTF8_PREV_CHAR_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \
    (c)=(s)[--(i)]; \
    if(UTF8_IS_TRAIL(c)) { \
        uint8_t __b, __count=1, __shift=6; \
\
        /* c is a trail byte */ \
        (c)&=0x3f; \
        for(;;) { \
            __b=(s)[--(i)]; \
            if(__b>=0xc0) { \
                UTF8_MASK_LEAD_BYTE(__b, __count); \
                (c)|=(UChar32)__b<<__shift; \
                break; \
            } else { \
                (c)|=(UChar32)(__b&0x3f)<<__shift; \
                ++__count; \
                __shift+=6; \
            } \
        } \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Renamed to U8_BACK_1_UNSAFE, see utf_old.h. */
#define UTF8_BACK_1_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \
    while(UTF8_IS_TRAIL((s)[--(i)])) {} \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Renamed to U8_BACK_N_UNSAFE, see utf_old.h. */
#define UTF8_BACK_N_UNSAFE(s, i, n) UPRV_BLOCK_MACRO_BEGIN { \
    int32_t __N=(n); \
    while(__N>0) { \
        UTF8_BACK_1_UNSAFE(s, i); \
        --__N; \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Renamed to U8_SET_CP_LIMIT_UNSAFE, see utf_old.h. */
#define UTF8_SET_CHAR_LIMIT_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \
    UTF8_BACK_1_UNSAFE(s, i); \
    UTF8_FWD_1_UNSAFE(s, i); \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Use U8_PREV instead, see utf_old.h. */
#define UTF8_PREV_CHAR_SAFE(s, start, i, c, strict) UPRV_BLOCK_MACRO_BEGIN { \
    (c)=(s)[--(i)]; \
    if((c)>=0x80) { \
        if((c)<=0xbf) { \
            (c)=utf8_prevCharSafeBody(s, start, &(i), c, strict); \
        } else { \
            (c)=UTF8_ERROR_VALUE_1; \
        } \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Renamed to U8_BACK_1, see utf_old.h. */
#define UTF8_BACK_1_SAFE(s, start, i) U8_BACK_1(s, start, i)

/** @deprecated ICU 2.4. Renamed to U8_BACK_N, see utf_old.h. */
#define UTF8_BACK_N_SAFE(s, start, i, n) U8_BACK_N(s, start, i, n)

/** @deprecated ICU 2.4. Renamed to U8_SET_CP_LIMIT, see utf_old.h. */
#define UTF8_SET_CHAR_LIMIT_SAFE(s, start, i, length) U8_SET_CP_LIMIT(s, start, i, length)

/* Formerly utf16.h --------------------------------------------------------- */

/** Is uchar a first/lead surrogate? @deprecated ICU 2.4. Renamed to U_IS_LEAD and U16_IS_LEAD, see utf_old.h. */
#define UTF_IS_FIRST_SURROGATE(uchar) (((uchar)&0xfffffc00)==0xd800)

/** Is uchar a second/trail surrogate? @deprecated ICU 2.4. Renamed to U_IS_TRAIL and U16_IS_TRAIL, see utf_old.h. */
#define UTF_IS_SECOND_SURROGATE(uchar) (((uchar)&0xfffffc00)==0xdc00)

/** Assuming c is a surrogate, is it a first/lead surrogate? @deprecated ICU 2.4. Renamed to U_IS_SURROGATE_LEAD and U16_IS_SURROGATE_LEAD, see utf_old.h. */
#define UTF_IS_SURROGATE_FIRST(c) (((c)&0x400)==0)

/** Helper constant for UTF16_GET_PAIR_VALUE. @deprecated ICU 2.4. Renamed to U16_SURROGATE_OFFSET, see utf_old.h. */
#define UTF_SURROGATE_OFFSET ((0xd800<<10UL)+0xdc00-0x10000)

/** Get the UTF-32 value from the surrogate code units. @deprecated ICU 2.4. Renamed to U16_GET_SUPPLEMENTARY, see utf_old.h. */
#define UTF16_GET_PAIR_VALUE(first, second) \
    (((first)<<10UL)+(second)-UTF_SURROGATE_OFFSET)

/** @deprecated ICU 2.4. Renamed to U16_LEAD, see utf_old.h. */
#define UTF_FIRST_SURROGATE(supplementary) (UChar)(((supplementary)>>10)+0xd7c0)

/** @deprecated ICU 2.4. Renamed to U16_TRAIL, see utf_old.h. */
#define UTF_SECOND_SURROGATE(supplementary) (UChar)(((supplementary)&0x3ff)|0xdc00)

/** @deprecated ICU 2.4. Renamed to U16_LEAD, see utf_old.h. */
#define UTF16_LEAD(supplementary) UTF_FIRST_SURROGATE(supplementary)

/** @deprecated ICU 2.4. Renamed to U16_TRAIL, see utf_old.h. */
#define UTF16_TRAIL(supplementary) UTF_SECOND_SURROGATE(supplementary)

/** @deprecated ICU 2.4. Renamed to U16_IS_SINGLE, see utf_old.h. */
#define UTF16_IS_SINGLE(uchar) !UTF_IS_SURROGATE(uchar)

/** @deprecated ICU 2.4. Renamed to U16_IS_LEAD, see utf_old.h. */
#define UTF16_IS_LEAD(uchar) UTF_IS_FIRST_SURROGATE(uchar)

/** @deprecated ICU 2.4. Renamed to U16_IS_TRAIL, see utf_old.h. */
#define UTF16_IS_TRAIL(uchar) UTF_IS_SECOND_SURROGATE(uchar)

/** Does this scalar Unicode value need multiple code units for storage? @deprecated ICU 2.4. Use U16_LENGTH or test ((uint32_t)(c)>0xffff) instead, see utf_old.h. */
#define UTF16_NEED_MULTIPLE_UCHAR(c) ((uint32_t)(c)>0xffff)

/** @deprecated ICU 2.4. Renamed to U16_LENGTH, see utf_old.h. */
#define UTF16_CHAR_LENGTH(c) ((uint32_t)(c)<=0xffff ? 1 : 2)

/** @deprecated ICU 2.4. Renamed to U16_MAX_LENGTH, see utf_old.h. */
#define UTF16_MAX_CHAR_LENGTH 2

/** Average number of code units compared to UTF-16. @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF16_ARRAY_SIZE(size) (size)

/**
 * Get a single code point from an offset that points to any
 * of the code units that belong to that code point.
 * Assume 0<=i<length.
 *
 * This could be used for iteration together with
 * UTF16_CHAR_LENGTH() and UTF_IS_ERROR(),
 * but the use of UTF16_NEXT_CHAR[_UNSAFE]() and
 * UTF16_PREV_CHAR[_UNSAFE]() is more efficient for that.
 * @deprecated ICU 2.4. Renamed to U16_GET_UNSAFE, see utf_old.h.
 */
#define UTF16_GET_CHAR_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \
    (c)=(s)[i]; \
    if(UTF_IS_SURROGATE(c)) { \
        if(UTF_IS_SURROGATE_FIRST(c)) { \
            (c)=UTF16_GET_PAIR_VALUE((c), (s)[(i)+1]); \
        } else { \
            (c)=UTF16_GET_PAIR_VALUE((s)[(i)-1], (c)); \
        } \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Use U16_GET instead, see utf_old.h. */
#define UTF16_GET_CHAR_SAFE(s, start, i, length, c, strict) UPRV_BLOCK_MACRO_BEGIN { \
    (c)=(s)[i]; \
    if(UTF_IS_SURROGATE(c)) { \
        uint16_t __c2; \
        if(UTF_IS_SURROGATE_FIRST(c)) { \
            if((i)+1<(length) && UTF_IS_SECOND_SURROGATE(__c2=(s)[(i)+1])) { \
                (c)=UTF16_GET_PAIR_VALUE((c), __c2); \
                /* strict: ((c)&0xfffe)==0xfffe is caught by UTF_IS_ERROR() and UTF_IS_UNICODE_CHAR() */ \
            } else if(strict) {\
                /* unmatched first surrogate */ \
                (c)=UTF_ERROR_VALUE; \
            } \
        } else { \
            if((i)-1>=(start) && UTF_IS_FIRST_SURROGATE(__c2=(s)[(i)-1])) { \
                (c)=UTF16_GET_PAIR_VALUE(__c2, (c)); \
                /* strict: ((c)&0xfffe)==0xfffe is caught by UTF_IS_ERROR() and UTF_IS_UNICODE_CHAR() */ \
            } else if(strict) {\
                /* unmatched second surrogate */ \
                (c)=UTF_ERROR_VALUE; \
            } \
        } \
    } else if((strict) && !UTF_IS_UNICODE_CHAR(c)) { \
        (c)=UTF_ERROR_VALUE; \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Renamed to U16_NEXT_UNSAFE, see utf_old.h. */
#define UTF16_NEXT_CHAR_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \
    (c)=(s)[(i)++]; \
    if(UTF_IS_FIRST_SURROGATE(c)) { \
        (c)=UTF16_GET_PAIR_VALUE((c), (s)[(i)++]); \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Renamed to U16_APPEND_UNSAFE, see utf_old.h. */
#define UTF16_APPEND_CHAR_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \
    if((uint32_t)(c)<=0xffff) { \
        (s)[(i)++]=(uint16_t)(c); \
    } else { \
        (s)[(i)++]=(uint16_t)(((c)>>10)+0xd7c0); \
        (s)[(i)++]=(uint16_t)(((c)&0x3ff)|0xdc00); \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Renamed to U16_FWD_1_UNSAFE, see utf_old.h. */
#define UTF16_FWD_1_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \
    if(UTF_IS_FIRST_SURROGATE((s)[(i)++])) { \
        ++(i); \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Renamed to U16_FWD_N_UNSAFE, see utf_old.h. */
#define UTF16_FWD_N_UNSAFE(s, i, n) UPRV_BLOCK_MACRO_BEGIN { \
    int32_t __N=(n); \
    while(__N>0) { \
        UTF16_FWD_1_UNSAFE(s, i); \
        --__N; \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Renamed to U16_SET_CP_START_UNSAFE, see utf_old.h. */
#define UTF16_SET_CHAR_START_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \
    if(UTF_IS_SECOND_SURROGATE((s)[i])) { \
        --(i); \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Use U16_NEXT instead, see utf_old.h. */
#define UTF16_NEXT_CHAR_SAFE(s, i, length, c, strict) UPRV_BLOCK_MACRO_BEGIN { \
    (c)=(s)[(i)++]; \
    if(UTF_IS_FIRST_SURROGATE(c)) { \
        uint16_t __c2; \
        if((i)<(length) && UTF_IS_SECOND_SURROGATE(__c2=(s)[(i)])) { \
            ++(i); \
            (c)=UTF16_GET_PAIR_VALUE((c), __c2); \
            /* strict: ((c)&0xfffe)==0xfffe is caught by UTF_IS_ERROR() and UTF_IS_UNICODE_CHAR() */ \
        } else if(strict) {\
            /* unmatched first surrogate */ \
            (c)=UTF_ERROR_VALUE; \
        } \
    } else if((strict) && !UTF_IS_UNICODE_CHAR(c)) { \
        /* unmatched second surrogate or other non-character */ \
        (c)=UTF_ERROR_VALUE; \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Use U16_APPEND instead, see utf_old.h. */
#define UTF16_APPEND_CHAR_SAFE(s, i, length, c) UPRV_BLOCK_MACRO_BEGIN { \
    if((uint32_t)(c)<=0xffff) { \
        (s)[(i)++]=(uint16_t)(c); \
    } else if((uint32_t)(c)<=0x10ffff) { \
        if((i)+1<(length)) { \
            (s)[(i)++]=(uint16_t)(((c)>>10)+0xd7c0); \
            (s)[(i)++]=(uint16_t)(((c)&0x3ff)|0xdc00); \
        } else /* not enough space */ { \
            (s)[(i)++]=UTF_ERROR_VALUE; \
        } \
    } else /* c>0x10ffff, write error value */ { \
        (s)[(i)++]=UTF_ERROR_VALUE; \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Renamed to U16_FWD_1, see utf_old.h. */
#define UTF16_FWD_1_SAFE(s, i, length) U16_FWD_1(s, i, length)

/** @deprecated ICU 2.4. Renamed to U16_FWD_N, see utf_old.h. */
#define UTF16_FWD_N_SAFE(s, i, length, n) U16_FWD_N(s, i, length, n)

/** @deprecated ICU 2.4. Renamed to U16_SET_CP_START, see utf_old.h. */
#define UTF16_SET_CHAR_START_SAFE(s, start, i) U16_SET_CP_START(s, start, i)

/** @deprecated ICU 2.4. Renamed to U16_PREV_UNSAFE, see utf_old.h. */
#define UTF16_PREV_CHAR_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \
    (c)=(s)[--(i)]; \
    if(UTF_IS_SECOND_SURROGATE(c)) { \
        (c)=UTF16_GET_PAIR_VALUE((s)[--(i)], (c)); \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Renamed to U16_BACK_1_UNSAFE, see utf_old.h. */
#define UTF16_BACK_1_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \
    if(UTF_IS_SECOND_SURROGATE((s)[--(i)])) { \
        --(i); \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Renamed to U16_BACK_N_UNSAFE, see utf_old.h. */
#define UTF16_BACK_N_UNSAFE(s, i, n) UPRV_BLOCK_MACRO_BEGIN { \
    int32_t __N=(n); \
    while(__N>0) { \
        UTF16_BACK_1_UNSAFE(s, i); \
        --__N; \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Renamed to U16_SET_CP_LIMIT_UNSAFE, see utf_old.h. */
#define UTF16_SET_CHAR_LIMIT_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \
    if(UTF_IS_FIRST_SURROGATE((s)[(i)-1])) { \
        ++(i); \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Use U16_PREV instead, see utf_old.h. */
#define UTF16_PREV_CHAR_SAFE(s, start, i, c, strict) UPRV_BLOCK_MACRO_BEGIN { \
    (c)=(s)[--(i)]; \
    if(UTF_IS_SECOND_SURROGATE(c)) { \
        uint16_t __c2; \
        if((i)>(start) && UTF_IS_FIRST_SURROGATE(__c2=(s)[(i)-1])) { \
            --(i); \
            (c)=UTF16_GET_PAIR_VALUE(__c2, (c)); \
            /* strict: ((c)&0xfffe)==0xfffe is caught by UTF_IS_ERROR() and UTF_IS_UNICODE_CHAR() */ \
        } else if(strict) {\
            /* unmatched second surrogate */ \
            (c)=UTF_ERROR_VALUE; \
        } \
    } else if((strict) && !UTF_IS_UNICODE_CHAR(c)) { \
        /* unmatched first surrogate or other non-character */ \
        (c)=UTF_ERROR_VALUE; \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Renamed to U16_BACK_1, see utf_old.h. */
#define UTF16_BACK_1_SAFE(s, start, i) U16_BACK_1(s, start, i)

/** @deprecated ICU 2.4. Renamed to U16_BACK_N, see utf_old.h. */
#define UTF16_BACK_N_SAFE(s, start, i, n) U16_BACK_N(s, start, i, n)

/** @deprecated ICU 2.4. Renamed to U16_SET_CP_LIMIT, see utf_old.h. */
#define UTF16_SET_CHAR_LIMIT_SAFE(s, start, i, length) U16_SET_CP_LIMIT(s, start, i, length)

/* Formerly utf32.h --------------------------------------------------------- */

/*
* Old documentation:
*
*   This file defines macros to deal with UTF-32 code units and code points.
*   Signatures and semantics are the same as for the similarly named macros
*   in utf16.h.
*   utf32.h is included by utf.h after unicode/umachine.h

*   and some common definitions.
*
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.

*/

/* internal definitions ----------------------------------------------------- */

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_IS_SAFE(c, strict) \
    (!(strict) ? \
        (uint32_t)(c)<=0x10ffff : \
        UTF_IS_UNICODE_CHAR(c))

/*
 * For the semantics of all of these macros, see utf16.h.
 * The UTF-32 versions are trivial because any code point is
 * encoded using exactly one code unit.
 */

/* single-code point definitions -------------------------------------------- */

/* classes of code unit values */

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_IS_SINGLE(uchar) 1
/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_IS_LEAD(uchar) 0
/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_IS_TRAIL(uchar) 0

/* number of code units per code point */

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_NEED_MULTIPLE_UCHAR(c) 0
/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_CHAR_LENGTH(c) 1
/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_MAX_CHAR_LENGTH 1

/* average number of code units compared to UTF-16 */

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_ARRAY_SIZE(size) (size)

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_GET_CHAR_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \
    (c)=(s)[i]; \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_GET_CHAR_SAFE(s, start, i, length, c, strict) UPRV_BLOCK_MACRO_BEGIN { \
    (c)=(s)[i]; \
    if(!UTF32_IS_SAFE(c, strict)) { \
        (c)=UTF_ERROR_VALUE; \
    } \
} UPRV_BLOCK_MACRO_END

/* definitions with forward iteration --------------------------------------- */

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_NEXT_CHAR_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \
    (c)=(s)[(i)++]; \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_APPEND_CHAR_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \
    (s)[(i)++]=(c); \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_FWD_1_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \
    ++(i); \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_FWD_N_UNSAFE(s, i, n) UPRV_BLOCK_MACRO_BEGIN { \
    (i)+=(n); \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_SET_CHAR_START_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_NEXT_CHAR_SAFE(s, i, length, c, strict) UPRV_BLOCK_MACRO_BEGIN { \
    (c)=(s)[(i)++]; \
    if(!UTF32_IS_SAFE(c, strict)) { \
        (c)=UTF_ERROR_VALUE; \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_APPEND_CHAR_SAFE(s, i, length, c) UPRV_BLOCK_MACRO_BEGIN { \
    if((uint32_t)(c)<=0x10ffff) { \
        (s)[(i)++]=(c); \
    } else /* c>0x10ffff, write 0xfffd */ { \
        (s)[(i)++]=0xfffd; \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_FWD_1_SAFE(s, i, length) UPRV_BLOCK_MACRO_BEGIN { \
    ++(i); \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_FWD_N_SAFE(s, i, length, n) UPRV_BLOCK_MACRO_BEGIN { \
    if(((i)+=(n))>(length)) { \
        (i)=(length); \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_SET_CHAR_START_SAFE(s, start, i) UPRV_BLOCK_MACRO_BEGIN { \
} UPRV_BLOCK_MACRO_END

/* definitions with backward iteration -------------------------------------- */

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_PREV_CHAR_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \
    (c)=(s)[--(i)]; \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_BACK_1_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \
    --(i); \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_BACK_N_UNSAFE(s, i, n) UPRV_BLOCK_MACRO_BEGIN { \
    (i)-=(n); \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_SET_CHAR_LIMIT_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_PREV_CHAR_SAFE(s, start, i, c, strict) UPRV_BLOCK_MACRO_BEGIN { \
    (c)=(s)[--(i)]; \
    if(!UTF32_IS_SAFE(c, strict)) { \
        (c)=UTF_ERROR_VALUE; \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_BACK_1_SAFE(s, start, i) UPRV_BLOCK_MACRO_BEGIN { \
    --(i); \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_BACK_N_SAFE(s, start, i, n) UPRV_BLOCK_MACRO_BEGIN { \
    (i)-=(n); \
    if((i)<(start)) { \
        (i)=(start); \
    } \
} UPRV_BLOCK_MACRO_END

/** @deprecated ICU 2.4. Obsolete, see utf_old.h. */
#define UTF32_SET_CHAR_LIMIT_SAFE(s, i, length) UPRV_BLOCK_MACRO_BEGIN { \
} UPRV_BLOCK_MACRO_END

/* Formerly utf.h, part 2 --------------------------------------------------- */

/**
 * Estimate the number of code units for a string based on the number of UTF-16 code units.
 *
 * @deprecated ICU 2.4. Obsolete, see utf_old.h.
 */
#define UTF_ARRAY_SIZE(size) UTF16_ARRAY_SIZE(size)

/** @deprecated ICU 2.4. Renamed to U16_GET_UNSAFE, see utf_old.h. */
#define UTF_GET_CHAR_UNSAFE(s, i, c)                 UTF16_GET_CHAR_UNSAFE(s, i, c)

/** @deprecated ICU 2.4. Use U16_GET instead, see utf_old.h. */
#define UTF_GET_CHAR_SAFE(s, start, i, length, c, strict) UTF16_GET_CHAR_SAFE(s, start, i, length, c, strict)

/** @deprecated ICU 2.4. Renamed to U16_NEXT_UNSAFE, see utf_old.h. */
#define UTF_NEXT_CHAR_UNSAFE(s, i, c)                UTF16_NEXT_CHAR_UNSAFE(s, i, c)

/** @deprecated ICU 2.4. Use U16_NEXT instead, see utf_old.h. */
#define UTF_NEXT_CHAR_SAFE(s, i, length, c, strict)  UTF16_NEXT_CHAR_SAFE(s, i, length, c, strict)

/** @deprecated ICU 2.4. Renamed to U16_APPEND_UNSAFE, see utf_old.h. */
#define UTF_APPEND_CHAR_UNSAFE(s, i, c)              UTF16_APPEND_CHAR_UNSAFE(s, i, c)

/** @deprecated ICU 2.4. Use U16_APPEND instead, see utf_old.h. */
#define UTF_APPEND_CHAR_SAFE(s, i, length, c)        UTF16_APPEND_CHAR_SAFE(s, i, length, c)

/** @deprecated ICU 2.4. Renamed to U16_FWD_1_UNSAFE, see utf_old.h. */
#define UTF_FWD_1_UNSAFE(s, i)                       UTF16_FWD_1_UNSAFE(s, i)

/** @deprecated ICU 2.4. Renamed to U16_FWD_1, see utf_old.h. */
#define UTF_FWD_1_SAFE(s, i, length)                 UTF16_FWD_1_SAFE(s, i, length)

/** @deprecated ICU 2.4. Renamed to U16_FWD_N_UNSAFE, see utf_old.h. */
#define UTF_FWD_N_UNSAFE(s, i, n)                    UTF16_FWD_N_UNSAFE(s, i, n)

/** @deprecated ICU 2.4. Renamed to U16_FWD_N, see utf_old.h. */
#define UTF_FWD_N_SAFE(s, i, length, n)              UTF16_FWD_N_SAFE(s, i, length, n)

/** @deprecated ICU 2.4. Renamed to U16_SET_CP_START_UNSAFE, see utf_old.h. */
#define UTF_SET_CHAR_START_UNSAFE(s, i)              UTF16_SET_CHAR_START_UNSAFE(s, i)

/** @deprecated ICU 2.4. Renamed to U16_SET_CP_START, see utf_old.h. */
#define UTF_SET_CHAR_START_SAFE(s, start, i)         UTF16_SET_CHAR_START_SAFE(s, start, i)

/** @deprecated ICU 2.4. Renamed to U16_PREV_UNSAFE, see utf_old.h. */
#define UTF_PREV_CHAR_UNSAFE(s, i, c)                UTF16_PREV_CHAR_UNSAFE(s, i, c)

/** @deprecated ICU 2.4. Use U16_PREV instead, see utf_old.h. */
#define UTF_PREV_CHAR_SAFE(s, start, i, c, strict)   UTF16_PREV_CHAR_SAFE(s, start, i, c, strict)

/** @deprecated ICU 2.4. Renamed to U16_BACK_1_UNSAFE, see utf_old.h. */
#define UTF_BACK_1_UNSAFE(s, i)                      UTF16_BACK_1_UNSAFE(s, i)

/** @deprecated ICU 2.4. Renamed to U16_BACK_1, see utf_old.h. */
#define UTF_BACK_1_SAFE(s, start, i)                 UTF16_BACK_1_SAFE(s, start, i)

/** @deprecated ICU 2.4. Renamed to U16_BACK_N_UNSAFE, see utf_old.h. */
#define UTF_BACK_N_UNSAFE(s, i, n)                   UTF16_BACK_N_UNSAFE(s, i, n)

/** @deprecated ICU 2.4. Renamed to U16_BACK_N, see utf_old.h. */
#define UTF_BACK_N_SAFE(s, start, i, n)              UTF16_BACK_N_SAFE(s, start, i, n)

/** @deprecated ICU 2.4. Renamed to U16_SET_CP_LIMIT_UNSAFE, see utf_old.h. */
#define UTF_SET_CHAR_LIMIT_UNSAFE(s, i)              UTF16_SET_CHAR_LIMIT_UNSAFE(s, i)

/** @deprecated ICU 2.4. Renamed to U16_SET_CP_LIMIT, see utf_old.h. */
#define UTF_SET_CHAR_LIMIT_SAFE(s, start, i, length) UTF16_SET_CHAR_LIMIT_SAFE(s, start, i, length)

/* Define default macros (UTF-16 "safe") ------------------------------------ */

/**
 * Does this code unit alone encode a code point (BMP, not a surrogate)?
 * Same as UTF16_IS_SINGLE.
 * @deprecated ICU 2.4. Renamed to U_IS_SINGLE and U16_IS_SINGLE, see utf_old.h.
 */
#define UTF_IS_SINGLE(uchar) U16_IS_SINGLE(uchar)

/**
 * Is this code unit the first one of several (a lead surrogate)?
 * Same as UTF16_IS_LEAD.
 * @deprecated ICU 2.4. Renamed to U_IS_LEAD and U16_IS_LEAD, see utf_old.h.
 */
#define UTF_IS_LEAD(uchar) U16_IS_LEAD(uchar)

/**
 * Is this code unit one of several but not the first one (a trail surrogate)?
 * Same as UTF16_IS_TRAIL.
 * @deprecated ICU 2.4. Renamed to U_IS_TRAIL and U16_IS_TRAIL, see utf_old.h.
 */
#define UTF_IS_TRAIL(uchar) U16_IS_TRAIL(uchar)

/**
 * Does this code point require multiple code units (is it a supplementary code point)?
 * Same as UTF16_NEED_MULTIPLE_UCHAR.
 * @deprecated ICU 2.4. Use U16_LENGTH or test ((uint32_t)(c)>0xffff) instead.
 */
#define UTF_NEED_MULTIPLE_UCHAR(c) UTF16_NEED_MULTIPLE_UCHAR(c)

/**
 * How many code units are used to encode this code point (1 or 2)?
 * Same as UTF16_CHAR_LENGTH.
 * @deprecated ICU 2.4. Renamed to U16_LENGTH, see utf_old.h.
 */
#define UTF_CHAR_LENGTH(c) U16_LENGTH(c)

/**
 * How many code units are used at most for any Unicode code point (2)?
 * Same as UTF16_MAX_CHAR_LENGTH.
 * @deprecated ICU 2.4. Renamed to U16_MAX_LENGTH, see utf_old.h.
 */
#define UTF_MAX_CHAR_LENGTH U16_MAX_LENGTH

/**
 * Set c to the code point that contains the code unit i.
 * i could point to the lead or the trail surrogate for the code point.
 * i is not modified.
 * Same as UTF16_GET_CHAR.
 * \pre 0<=i<length
 *
 * @deprecated ICU 2.4. Renamed to U16_GET, see utf_old.h.
 */
#define UTF_GET_CHAR(s, start, i, length, c) U16_GET(s, start, i, length, c)

/**
 * Set c to the code point that starts at code unit i
 * and advance i to beyond the code units of this code point (post-increment).
 * i must point to the first code unit of a code point.
 * Otherwise c is set to the trail unit (surrogate) itself.
 * Same as UTF16_NEXT_CHAR.
 * \pre 0<=i<length
 * \post 0<i<=length
 *
 * @deprecated ICU 2.4. Renamed to U16_NEXT, see utf_old.h.
 */
#define UTF_NEXT_CHAR(s, i, length, c) U16_NEXT(s, i, length, c)

/**
 * Append the code units of code point c to the string at index i
 * and advance i to beyond the new code units (post-increment).
 * The code units beginning at index i will be overwritten.
 * Same as UTF16_APPEND_CHAR.
 * \pre 0<=c<=0x10ffff
 * \pre 0<=i<length
 * \post 0<i<=length
 *
 * @deprecated ICU 2.4. Use U16_APPEND instead, see utf_old.h.
 */
#define UTF_APPEND_CHAR(s, i, length, c) UTF16_APPEND_CHAR_SAFE(s, i, length, c)

/**
 * Advance i to beyond the code units of the code point that begins at i.
 * I.e., advance i by one code point.
 * Same as UTF16_FWD_1.
 * \pre 0<=i<length
 * \post 0<i<=length
 *
 * @deprecated ICU 2.4. Renamed to U16_FWD_1, see utf_old.h.
 */
#define UTF_FWD_1(s, i, length) U16_FWD_1(s, i, length)

/**
 * Advance i to beyond the code units of the n code points where the first one begins at i.
 * I.e., advance i by n code points.
 * Same as UT16_FWD_N.
 * \pre 0<=i<length
 * \post 0<i<=length
 *
 * @deprecated ICU 2.4. Renamed to U16_FWD_N, see utf_old.h.
 */
#define UTF_FWD_N(s, i, length, n) U16_FWD_N(s, i, length, n)

/**
 * Take the random-access index i and adjust it so that it points to the beginning
 * of a code point.
 * The input index points to any code unit of a code point and is moved to point to
 * the first code unit of the same code point. i is never incremented.
 * In other words, if i points to a trail surrogate that is preceded by a matching
 * lead surrogate, then i is decremented. Otherwise it is not modified.
 * This can be used to start an iteration with UTF_NEXT_CHAR() from a random index.
 * Same as UTF16_SET_CHAR_START.
 * \pre start<=i<length
 * \post start<=i<length
 *
 * @deprecated ICU 2.4. Renamed to U16_SET_CP_START, see utf_old.h.
 */
#define UTF_SET_CHAR_START(s, start, i) U16_SET_CP_START(s, start, i)

/**
 * Set c to the code point that has code units before i
 * and move i backward (towards the beginning of the string)
 * to the first code unit of this code point (pre-increment).
 * i must point to the first code unit after the last unit of a code point (i==length is allowed).
 * Same as UTF16_PREV_CHAR.
 * \pre start<i<=length
 * \post start<=i<length
 *
 * @deprecated ICU 2.4. Renamed to U16_PREV, see utf_old.h.
 */
#define UTF_PREV_CHAR(s, start, i, c) U16_PREV(s, start, i, c)

/**
 * Move i backward (towards the beginning of the string)
 * to the first code unit of the code point that has code units before i.
 * I.e., move i backward by one code point.
 * i must point to the first code unit after the last unit of a code point (i==length is allowed).
 * Same as UTF16_BACK_1.
 * \pre start<i<=length
 * \post start<=i<length
 *
 * @deprecated ICU 2.4. Renamed to U16_BACK_1, see utf_old.h.
 */
#define UTF_BACK_1(s, start, i) U16_BACK_1(s, start, i)

/**
 * Move i backward (towards the beginning of the string)
 * to the first code unit of the n code points that have code units before i.
 * I.e., move i backward by n code points.
 * i must point to the first code unit after the last unit of a code point (i==length is allowed).
 * Same as UTF16_BACK_N.
 * \pre start<i<=length
 * \post start<=i<length
 *
 * @deprecated ICU 2.4. Renamed to U16_BACK_N, see utf_old.h.
 */
#define UTF_BACK_N(s, start, i, n) U16_BACK_N(s, start, i, n)

/**
 * Take the random-access index i and adjust it so that it points beyond
 * a code point. The input index points beyond any code unit
 * of a code point and is moved to point beyond the last code unit of the same
 * code point. i is never decremented.
 * In other words, if i points to a trail surrogate that is preceded by a matching
 * lead surrogate, then i is incremented. Otherwise it is not modified.
 * This can be used to start an iteration with UTF_PREV_CHAR() from a random index.
 * Same as UTF16_SET_CHAR_LIMIT.
 * \pre start<i<=length
 * \post start<i<=length
 *
 * @deprecated ICU 2.4. Renamed to U16_SET_CP_LIMIT, see utf_old.h.
 */
#define UTF_SET_CHAR_LIMIT(s, start, i, length) U16_SET_CP_LIMIT(s, start, i, length)

#endif  // !U_HIDE_DEPRECATED_API && !U_HIDE_OBSOLETE_UTF_OLD_H

#endif


text:
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
*   Copyright (C) 2010-2016, International Business Machines
*   Corporation and others.  All Rights Reserved.
*******************************************************************************
*   file name:  ucharstriebuilder.h
*   encoding:   UTF-8
*   tab size:   8 (not used)
*   indentation:4
*
*   created on: 2010nov14
*   created by: Markus W. Scherer
*/

#ifndef __UCHARSTRIEBUILDER_H__
#define __UCHARSTRIEBUILDER_H__

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API

#include "unicode/stringtriebuilder.h"
#include "unicode/ucharstrie.h"
#include "unicode/unistr.h"

/**
 * \file
 * \brief C++ API: Builder for icu::UCharsTrie
 */

U_NAMESPACE_BEGIN

class UCharsTrieElement;

/**
 * Builder class for UCharsTrie.
 *
 * This class is not intended for public subclassing.
 * @stable ICU 4.8
 */
class U_COMMON_API UCharsTrieBuilder : public StringTrieBuilder {
public:
    /**
     * Constructs an empty builder.
     * @param errorCode Standard ICU error code.
     * @stable ICU 4.8
     */
    UCharsTrieBuilder(UErrorCode &errorCode);

    /**
     * Destructor.
     * @stable ICU 4.8
     */
    virtual ~UCharsTrieBuilder();

    /**
     * Adds a (string, value) pair.
     * The string must be unique.
     * The string contents will be copied; the builder does not keep
     * a reference to the input UnicodeString or its buffer.
     * @param s The input string.
     * @param value The value associated with this string.
     * @param errorCode Standard ICU error code. Its input value must
     *                  pass the U_SUCCESS() test, or else the function returns
     *                  immediately. Check for U_FAILURE() on output or use with
     *                  function chaining. (See User Guide for details.)
     * @return *this
     * @stable ICU 4.8
     */
    UCharsTrieBuilder &add(const UnicodeString &s, int32_t value, UErrorCode &errorCode);

    /**
     * Builds a UCharsTrie for the add()ed data.
     * Once built, no further data can be add()ed until clear() is called.
     *
     * A UCharsTrie cannot be empty. At least one (string, value) pair
     * must have been add()ed.
     *
     * This method passes ownership of the builder's internal result array to the new trie object.
     * Another call to any build() variant will re-serialize the trie.
     * After clear() has been called, a new array will be used as well.
     * @param buildOption Build option, see UStringTrieBuildOption.
     * @param errorCode Standard ICU error code. Its input value must
     *                  pass the U_SUCCESS() test, or else the function returns
     *                  immediately. Check for U_FAILURE() on output or use with
     *                  function chaining. (See User Guide for details.)
     * @return A new UCharsTrie for the add()ed data.
     * @stable ICU 4.8
     */
    UCharsTrie *build(UStringTrieBuildOption buildOption, UErrorCode &errorCode);

    /**
     * Builds a UCharsTrie for the add()ed data and char16_t-serializes it.
     * Once built, no further data can be add()ed until clear() is called.
     *
     * A UCharsTrie cannot be empty. At least one (string, value) pair
     * must have been add()ed.
     *
     * Multiple calls to buildUnicodeString() set the UnicodeStrings to the
     * builder's same char16_t array, without rebuilding.
     * If buildUnicodeString() is called after build(), the trie will be
     * re-serialized into a new array.
     * If build() is called after buildUnicodeString(), the trie object will become
     * the owner of the previously returned array.
     * After clear() has been called, a new array will be used as well.
     * @param buildOption Build option, see UStringTrieBuildOption.
     * @param result A UnicodeString which will be set to the char16_t-serialized
     *               UCharsTrie for the add()ed data.
     * @param errorCode Standard ICU error code. Its input value must
     *                  pass the U_SUCCESS() test, or else the function returns
     *                  immediately. Check for U_FAILURE() on output or use with
     *                  function chaining. (See User Guide for details.)
     * @return result
     * @stable ICU 4.8
     */
    UnicodeString &buildUnicodeString(UStringTrieBuildOption buildOption, UnicodeString &result,
                                      UErrorCode &errorCode);

    /**
     * Removes all (string, value) pairs.
     * New data can then be add()ed and a new trie can be built.
     * @return *this
     * @stable ICU 4.8
     */
    UCharsTrieBuilder &clear() {
        strings.remove();
        elementsLength=0;
        ucharsLength=0;
        return *this;
    }

private:
    UCharsTrieBuilder(const UCharsTrieBuilder &other);  // no copy constructor
    UCharsTrieBuilder &operator=(const UCharsTrieBuilder &other);  // no assignment operator

    void buildUChars(UStringTrieBuildOption buildOption, UErrorCode &errorCode);

    virtual int32_t getElementStringLength(int32_t i) const;
    virtual char16_t getElementUnit(int32_t i, int32_t unitIndex) const;
    virtual int32_t getElementValue(int32_t i) const;

    virtual int32_t getLimitOfLinearMatch(int32_t first, int32_t last, int32_t unitIndex) const;

    virtual int32_t countElementUnits(int32_t start, int32_t limit, int32_t unitIndex) const;
    virtual int32_t skipElementsBySomeUnits(int32_t i, int32_t unitIndex, int32_t count) const;
    virtual int32_t indexOfElementWithNextUnit(int32_t i, int32_t unitIndex, char16_t unit) const;

    virtual UBool matchNodesCanHaveValues() const { return TRUE; }

    virtual int32_t getMaxBranchLinearSubNodeLength() const { return UCharsTrie::kMaxBranchLinearSubNodeLength; }
    virtual int32_t getMinLinearMatch() const { return UCharsTrie::kMinLinearMatch; }
    virtual int32_t getMaxLinearMatchLength() const { return UCharsTrie::kMaxLinearMatchLength; }

    class UCTLinearMatchNode : public LinearMatchNode {
    public:
        UCTLinearMatchNode(const char16_t *units, int32_t len, Node *nextNode);
        virtual UBool operator==(const Node &other) const;
        virtual void write(StringTrieBuilder &builder);
    private:
        const char16_t *s;
    };

    virtual Node *createLinearMatchNode(int32_t i, int32_t unitIndex, int32_t length,
                                        Node *nextNode) const;

    UBool ensureCapacity(int32_t length);
    virtual int32_t write(int32_t unit);
    int32_t write(const char16_t *s, int32_t length);
    virtual int32_t writeElementUnits(int32_t i, int32_t unitIndex, int32_t length);
    virtual int32_t writeValueAndFinal(int32_t i, UBool isFinal);
    virtual int32_t writeValueAndType(UBool hasValue, int32_t value, int32_t node);
    virtual int32_t writeDeltaTo(int32_t jumpTarget);

    UnicodeString strings;
    UCharsTrieElement *elements;
    int32_t elementsCapacity;
    int32_t elementsLength;

    // char16_t serialization of the trie.
    // Grows from the back: ucharsLength measures from the end of the buffer!
    char16_t *uchars;
    int32_t ucharsCapacity;
    int32_t ucharsLength;
};

U_NAMESPACE_END

#endif /* U_SHOW_CPLUSPLUS_API */

#endif  // __UCHARSTRIEBUILDER_H__

repo_language: C

mime_type: text/x-c


text:
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
* Copyright (C) 2008-2009, International Business Machines Corporation and
* others. All Rights Reserved.
*******************************************************************************
*
* File DTINTRV.H
*
*******************************************************************************
*/

#ifndef __DTINTRV_H__
#define __DTINTRV_H__

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API

#include "unicode/uobject.h"

/**
 * \file
 * \brief C++ API: Date Interval data type
 */

U_NAMESPACE_BEGIN

/**
 * This class represents a date interval.
 * It is a pair of UDate representing from UDate 1 to UDate 2.
 * @stable ICU 4.0
**/
class U_COMMON_API DateInterval : public UObject {
public:

    /**
     * Construct a DateInterval given a from date and a to date.
     * @param fromDate  The from date in date interval.
     * @param toDate    The to date in date interval.
     * @stable ICU 4.0
     */
    DateInterval(UDate fromDate, UDate toDate);

    /**
     * destructor
     * @stable ICU 4.0
     */
    virtual ~DateInterval();

    /**
     * Get the from date.
     * @return  the from date in dateInterval.
     * @stable ICU 4.0
     */
    inline UDate getFromDate() const;

    /**
     * Get the to date.
     * @return  the to date in dateInterval.
     * @stable ICU 4.0
     */
    inline UDate getToDate() const;

    /**
     * Return the class ID for this class. This is useful only for comparing to
     * a return value from getDynamicClassID(). For example:
     * <pre>
     * .   Base* polymorphic_pointer = createPolymorphicObject();
     * .   if (polymorphic_pointer->getDynamicClassID() ==
     * .       derived::getStaticClassID()) ...
     * </pre>
     * @return          The class ID for all objects of this class.
     * @stable ICU 4.0
     */
    static UClassID U_EXPORT2 getStaticClassID(void);

    /**
     * Returns a unique class ID POLYMORPHICALLY. Pure virtual override. This
     * method is to implement a simple version of RTTI, since not all C++
     * compilers support genuine RTTI. Polymorphic operator==() and clone()
     * methods call this method.
     *
     * @return          The class ID for this object. All objects of a
     *                  given class have the same class ID.  Objects of
     *                  other classes have different class IDs.
     * @stable ICU 4.0
     */
    virtual UClassID getDynamicClassID(void) const;

    /**
     * Copy constructor.
     * @stable ICU 4.0
     */
    DateInterval(const DateInterval& other);

    /**
     * Default assignment operator
     * @stable ICU 4.0
     */
    DateInterval& operator=(const DateInterval&);

    /**
     * Equality operator.
     * @return TRUE if the two DateIntervals are the same
     * @stable ICU 4.0
     */
    virtual UBool operator==(const DateInterval& other) const;

    /**
     * Non-equality operator
     * @return TRUE if the two DateIntervals are not the same
     * @stable ICU 4.0
     */
    inline UBool operator!=(const DateInterval& other) const;

    /**
     * clone this object.
     * The caller owns the result and should delete it when done.
     * @return a cloned DateInterval
     * @stable ICU 4.0
     */
     virtual DateInterval* clone() const;

private:
    /**
     * Default constructor, not implemented.
     */
    DateInterval();

    UDate fromDate;
    UDate toDate;

} ;// end class DateInterval

inline UDate
DateInterval::getFromDate() const {
    return fromDate;
}

inline UDate
DateInterval::getToDate() const {
    return toDate;
}

inline UBool
DateInterval::operator!=(const DateInterval& other) const {
    return ( !operator==(other) );
}

U_NAMESPACE_END

#endif /* U_SHOW_CPLUSPLUS_API */

#endif


text:
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
**********************************************************************
*   Copyright (C) 1999-2009, International Business Machines
*   Corporation and others.  All Rights Reserved.
**********************************************************************
 *
 *
 *   ucnv_err.h:
 */

/**
 * \file
 * \brief C UConverter predefined error callbacks
 *
 *
Error Behaviour Functions

 *  Defines some error behaviour functions called by ucnv_{from,to}Unicode
 *  These are provided as part of ICU and many are stable, but they
 *  can also be considered only as an example of what can be done with
 *  callbacks.  You may of course write your own.
 *
 *  If you want to write your own, you may also find the functions from
 *  ucnv_cb.h useful when writing your own callbacks.
 *
 *  These functions, although public, should NEVER be called directly.
 *  They should be used as parameters to the ucnv_setFromUCallback
 *  and ucnv_setToUCallback functions, to set the behaviour of a converter
 *  when it encounters ILLEGAL/UNMAPPED/INVALID sequences.
 *
 *  usage example:  'STOP' doesn't need any context, but newContext
 *    could be set to something other than 'NULL' if needed. The available
 *    contexts in this header can modify the default behavior of the callback.
 *
 *  \code
 *  UErrorCode err = U_ZERO_ERROR;
 *  UConverter *myConverter = ucnv_open("ibm-949", &err);
 *  const void *oldContext;
 *  UConverterFromUCallback oldAction;
 *
 *
 *  if (U_SUCCESS(err))
 *  {
 *      ucnv_setFromUCallBack(myConverter,
 *                       UCNV_FROM_U_CALLBACK_STOP,
 *                       NULL,
 *                       &oldAction,
 *                       &oldContext,
 *                       &status);
 *  }
 *  \endcode
 *
 *  The code above tells "myConverter" to stop when it encounters an
 *  ILLEGAL/TRUNCATED/INVALID sequences when it is used to convert from
 *  Unicode -> Codepage. The behavior from Codepage to Unicode is not changed,
 *  and ucnv_setToUCallBack would need to be called in order to change
 *  that behavior too.
 *
 *  Here is an example with a context:
 *
 *  \code
 *  UErrorCode err = U_ZERO_ERROR;
 *  UConverter *myConverter = ucnv_open("ibm-949", &err);
 *  const void *oldContext;
 *  UConverterFromUCallback oldAction;
 *
 *
 *  if (U_SUCCESS(err))
 *  {
 *      ucnv_setToUCallBack(myConverter,
 *                       UCNV_TO_U_CALLBACK_SUBSTITUTE,
 *                       UCNV_SUB_STOP_ON_ILLEGAL,
 *                       &oldAction,
 *                       &oldContext,
 *                       &status);
 *  }
 *  \endcode
 *
 *  The code above tells "myConverter" to stop when it encounters an
 *  ILLEGAL/TRUNCATED/INVALID sequences when it is used to convert from
 *  Codepage -> Unicode. Any unmapped and legal characters will be
 *  substituted to be the default substitution character.
 */

#ifndef UCNV_ERR_H
#define UCNV_ERR_H

#include "unicode/utypes.h"

#if !UCONFIG_NO_CONVERSION

/** Forward declaring the UConverter structure. @stable ICU 2.0 */
struct UConverter;

/** @stable ICU 2.0 */
typedef struct UConverter UConverter;

/**
 * FROM_U, TO_U context options for sub callback
 * @stable ICU 2.0
 */
#define UCNV_SUB_STOP_ON_ILLEGAL "i"

/**
 * FROM_U, TO_U context options for skip callback
 * @stable ICU 2.0
 */
#define UCNV_SKIP_STOP_ON_ILLEGAL "i"

/**
 * FROM_U_CALLBACK_ESCAPE context option to escape the code unit according to ICU (%UXXXX)
 * @stable ICU 2.0
 */
#define UCNV_ESCAPE_ICU       NULL
/**
 * FROM_U_CALLBACK_ESCAPE context option to escape the code unit according to JAVA (\\uXXXX)
 * @stable ICU 2.0
 */
#define UCNV_ESCAPE_JAVA      "J"
/**
 * FROM_U_CALLBACK_ESCAPE context option to escape the code unit according to C (\\uXXXX \\UXXXXXXXX)
 * TO_U_CALLBACK_ESCAPE option to escape the character value according to C (\\xXXXX)
 * @stable ICU 2.0
 */
#define UCNV_ESCAPE_C         "C"
/**
 * FROM_U_CALLBACK_ESCAPE context option to escape the code unit according to XML Decimal escape \htmlonly(&#DDDD;)\endhtmlonly
 * TO_U_CALLBACK_ESCAPE context option to escape the character value according to XML Decimal escape \htmlonly(&#DDDD;)\endhtmlonly
 * @stable ICU 2.0
 */
#define UCNV_ESCAPE_XML_DEC   "D"
/**
 * FROM_U_CALLBACK_ESCAPE context option to escape the code unit according to XML Hex escape \htmlonly(&#xXXXX;)\endhtmlonly
 * TO_U_CALLBACK_ESCAPE context option to escape the character value according to XML Hex escape \htmlonly(&#xXXXX;)\endhtmlonly
 * @stable ICU 2.0
 */
#define UCNV_ESCAPE_XML_HEX   "X"
/**
 * FROM_U_CALLBACK_ESCAPE context option to escape the code unit according to Unicode (U+XXXXX)
 * @stable ICU 2.0
 */
#define UCNV_ESCAPE_UNICODE   "U"

/**
 * FROM_U_CALLBACK_ESCAPE context option to escape the code unit according to CSS2 conventions (\\HH..H<space>, that is,
 * a backslash, 1..6 hex digits, and a space)
 * @stable ICU 4.0
 */
#define UCNV_ESCAPE_CSS2   "S"

/**
 * The process condition code to be used with the callbacks.
 * Codes which are greater than UCNV_IRREGULAR should be
 * passed on to any chained callbacks.
 * @stable ICU 2.0
 */
typedef enum {
    UCNV_UNASSIGNED = 0,  /**< The code point is unassigned.
                             The error code U_INVALID_CHAR_FOUND will be set. */
    UCNV_ILLEGAL = 1,     /**< The code point is illegal. For example,
                             \\x81\\x2E is illegal in SJIS because \\x2E
                             is not a valid trail byte for the \\x81
                             lead byte.
                             Also, starting with Unicode 3.0.1, non-shortest byte sequences
                             in UTF-8 (like \\xC1\\xA1 instead of \\x61 for U+0061)
                             are also illegal, not just irregular.
                             The error code U_ILLEGAL_CHAR_FOUND will be set. */
    UCNV_IRREGULAR = 2,   /**< The codepoint is not a regular sequence in
                             the encoding. For example, \\xED\\xA0\\x80..\\xED\\xBF\\xBF
                             are irregular UTF-8 byte sequences for single surrogate
                             code points.
                             The error code U_INVALID_CHAR_FOUND will be set. */
    UCNV_RESET = 3,       /**< The callback is called with this reason when a
                             'reset' has occurred. Callback should reset all
                             state. */
    UCNV_CLOSE = 4,        /**< Called when the converter is closed. The
                             callback should release any allocated memory.*/
    UCNV_CLONE = 5         /**< Called when ucnv_safeClone() is called on the
                              converter. the pointer available as the
                              'context' is an alias to the original converters'
                              context pointer. If the context must be owned
                              by the new converter, the callback must clone
                              the data and call ucnv_setFromUCallback
                              (or setToUCallback) with the correct pointer.
                              @stable ICU 2.2
                           */
} UConverterCallbackReason;

/**
 * The structure for the fromUnicode callback function parameter.
 * @stable ICU 2.0
 */
typedef struct {
    uint16_t size;              /**< The size of this struct. @stable ICU 2.0 */
    UBool flush;                /**< The internal state of converter will be reset and data flushed if set to TRUE. @stable ICU 2.0    */
    UConverter *converter;      /**< Pointer to the converter that is opened and to which this struct is passed as an argument. @stable ICU 2.0  */
    const UChar *source;        /**< Pointer to the source source buffer. @stable ICU 2.0    */
    const UChar *sourceLimit;   /**< Pointer to the limit (end + 1) of source buffer. @stable ICU 2.0    */
    char *target;               /**< Pointer to the target buffer. @stable ICU 2.0    */
    const char *targetLimit;    /**< Pointer to the limit (end + 1) of target buffer. @stable ICU 2.0     */
    int32_t *offsets;           /**< Pointer to the buffer that receives the offsets. *offset = blah ; offset++;. @stable ICU 2.0  */
} UConverterFromUnicodeArgs;

/**
 * The structure for the toUnicode callback function parameter.
 * @stable ICU 2.0
 */
typedef struct {
    uint16_t size;              /**< The size of this struct   @stable ICU 2.0 */
    UBool flush;                /**< The internal state of converter will be reset and data flushed if set to TRUE. @stable ICU 2.0   */
    UConverter *converter;      /**< Pointer to the converter that is opened and to which this struct is passed as an argument. @stable ICU 2.0 */
    const char *source;         /**< Pointer to the source source buffer. @stable ICU 2.0    */
    const char *sourceLimit;    /**< Pointer to the limit (end + 1) of source buffer. @stable ICU 2.0    */
    UChar *target;              /**< Pointer to the target buffer. @stable ICU 2.0    */
    const UChar *targetLimit;   /**< Pointer to the limit (end + 1) of target buffer. @stable ICU 2.0     */
    int32_t *offsets;           /**< Pointer to the buffer that receives the offsets. *offset = blah ; offset++;. @stable ICU 2.0  */
} UConverterToUnicodeArgs;

/**
 * DO NOT CALL THIS FUNCTION DIRECTLY!
 * This From Unicode callback STOPS at the ILLEGAL_SEQUENCE,
 * returning the error code back to the caller immediately.
 *
 * @param context Pointer to the callback's private data
 * @param fromUArgs Information about the conversion in progress
 * @param codeUnits Points to 'length' UChars of the concerned Unicode sequence
 * @param length Size (in bytes) of the concerned codepage sequence
 * @param codePoint Single UChar32 (UTF-32) containing the concerend Unicode codepoint.
 * @param reason Defines the reason the callback was invoked
 * @param err This should always be set to a failure status prior to calling.
 * @stable ICU 2.0
 */
U_STABLE void U_EXPORT2 UCNV_FROM_U_CALLBACK_STOP (
                  const void *context,
                  UConverterFromUnicodeArgs *fromUArgs,
                  const UChar* codeUnits,
                  int32_t length,
                  UChar32 codePoint,
                  UConverterCallbackReason reason,
                  UErrorCode * err);

/**
 * DO NOT CALL THIS FUNCTION DIRECTLY!
 * This To Unicode callback STOPS at the ILLEGAL_SEQUENCE,
 * returning the error code back to the caller immediately.
 *
 * @param context Pointer to the callback's private data
 * @param toUArgs Information about the conversion in progress
 * @param codeUnits Points to 'length' bytes of the concerned codepage sequence
 * @param length Size (in bytes) of the concerned codepage sequence
 * @param reason Defines the reason the callback was invoked
 * @param err This should always be set to a failure status prior to calling.
 * @stable ICU 2.0
 */
U_STABLE void U_EXPORT2 UCNV_TO_U_CALLBACK_STOP (
                  const void *context,
                  UConverterToUnicodeArgs *toUArgs,
                  const char* codeUnits,
                  int32_t length,
                  UConverterCallbackReason reason,
                  UErrorCode * err);

/**
 * DO NOT CALL THIS FUNCTION DIRECTLY!
 * This From Unicode callback skips any ILLEGAL_SEQUENCE, or
 * skips only UNASSINGED_SEQUENCE depending on the context parameter
 * simply ignoring those characters.
 *
 * @param context  The function currently recognizes the callback options:
 *                 UCNV_SKIP_STOP_ON_ILLEGAL: STOPS at the ILLEGAL_SEQUENCE,
 *                      returning the error code back to the caller immediately.
 *                 NULL: Skips any ILLEGAL_SEQUENCE
 * @param fromUArgs Information about the conversion in progress
 * @param codeUnits Points to 'length' UChars of the concerned Unicode sequence
 * @param length Size (in bytes) of the concerned codepage sequence
 * @param codePoint Single UChar32 (UTF-32) containing the concerend Unicode codepoint.
 * @param reason Defines the reason the callback was invoked
 * @param err Return value will be set to success if the callback was handled,
 *      otherwise this value will be set to a failure status.
 * @stable ICU 2.0
 */
U_STABLE void U_EXPORT2 UCNV_FROM_U_CALLBACK_SKIP (
                  const void *context,
                  UConverterFromUnicodeArgs *fromUArgs,
                  const UChar* codeUnits,
                  int32_t length,
                  UChar32 codePoint,
                  UConverterCallbackReason reason,
                  UErrorCode * err);

/**
 * DO NOT CALL THIS FUNCTION DIRECTLY!
 * This From Unicode callback will Substitute the ILLEGAL SEQUENCE, or
 * UNASSIGNED_SEQUENCE depending on context parameter, with the
 * current substitution string for the converter. This is the default
 * callback.
 *
 * @param context The function currently recognizes the callback options:
 *                 UCNV_SUB_STOP_ON_ILLEGAL: STOPS at the ILLEGAL_SEQUENCE,
 *                      returning the error code back to the caller immediately.
 *                 NULL: Substitutes any ILLEGAL_SEQUENCE
 * @param fromUArgs Information about the conversion in progress
 * @param codeUnits Points to 'length' UChars of the concerned Unicode sequence
 * @param length Size (in bytes) of the concerned codepage sequence
 * @param codePoint Single UChar32 (UTF-32) containing the concerend Unicode codepoint.
 * @param reason Defines the reason the callback was invoked
 * @param err Return value will be set to success if the callback was handled,
 *      otherwise this value will be set to a failure status.
 * @see ucnv_setSubstChars
 * @stable ICU 2.0
 */
U_STABLE void U_EXPORT2 UCNV_FROM_U_CALLBACK_SUBSTITUTE (
                  const void *context,
                  UConverterFromUnicodeArgs *fromUArgs,
                  const UChar* codeUnits,
                  int32_t length,
                  UChar32 codePoint,
                  UConverterCallbackReason reason,
                  UErrorCode * err);

/**
 * DO NOT CALL THIS FUNCTION DIRECTLY!
 * This From Unicode callback will Substitute the ILLEGAL SEQUENCE with the
 * hexadecimal representation of the illegal codepoints
 *
 * @param context The function currently recognizes the callback options:
 *

 *
UCNV_ESCAPE_ICU: Substitues the  ILLEGAL SEQUENCE with the hexadecimal
 *          representation in the format  %UXXXX, e.g. "%uFFFE%u00AC%uC8FE").
 *          In the Event the converter doesn't support the characters {%,U}[A-F][0-9],
 *          it will  substitute  the illegal sequence with the substitution characters.
 *          Note that  codeUnit(32bit int eg: unit of a surrogate pair) is represented as
 *          %UD84D%UDC56

 *
UCNV_ESCAPE_JAVA: Substitues the  ILLEGAL SEQUENCE with the hexadecimal
 *          representation in the format  \\uXXXX, e.g. "\\uFFFE\\u00AC\\uC8FE").
 *          In the Event the converter doesn't support the characters {\,u}[A-F][0-9],
 *          it will  substitute  the illegal sequence with the substitution characters.
 *          Note that  codeUnit(32bit int eg: unit of a surrogate pair) is represented as
 *          \\uD84D\\uDC56

 *
UCNV_ESCAPE_C: Substitues the  ILLEGAL SEQUENCE with the hexadecimal
 *          representation in the format  \\uXXXX, e.g. "\\uFFFE\\u00AC\\uC8FE").
 *          In the Event the converter doesn't support the characters {\,u,U}[A-F][0-9],
 *          it will  substitute  the illegal sequence with the substitution characters.
 *          Note that  codeUnit(32bit int eg: unit of a surrogate pair) is represented as
 *          \\U00023456

 *
UCNV_ESCAPE_XML_DEC: Substitues the  ILLEGAL SEQUENCE with the decimal
 *          representation in the format \htmlonly&#DDDDDDDD;, e.g. "&#65534;&#172;&#51454;")\endhtmlonly.
 *          In the Event the converter doesn't support the characters {&,#}[0-9],
 *          it will  substitute  the illegal sequence with the substitution characters.
 *          Note that  codeUnit(32bit int eg: unit of a surrogate pair) is represented as
 *          &#144470; and Zero padding is ignored.

 *
UCNV_ESCAPE_XML_HEX:Substitues the  ILLEGAL SEQUENCE with the decimal
 *          representation in the format \htmlonly&#xXXXX; e.g. "&#xFFFE;&#x00AC;&#xC8FE;")\endhtmlonly.
 *          In the Event the converter doesn't support the characters {&,#,x}[0-9],
 *          it will  substitute  the illegal sequence with the substitution characters.
 *          Note that  codeUnit(32bit int eg: unit of a surrogate pair) is represented as
 *          \htmlonly&#x23456;\endhtmlonly

 *

 * @param fromUArgs Information about the conversion in progress
 * @param codeUnits Points to 'length' UChars of the concerned Unicode sequence
 * @param length Size (in bytes) of the concerned codepage sequence
 * @param codePoint Single UChar32 (UTF-32) containing the concerend Unicode codepoint.
 * @param reason Defines the reason the callback was invoked
 * @param err Return value will be set to success if the callback was handled,
 *      otherwise this value will be set to a failure status.
 * @stable ICU 2.0
 */
U_STABLE void U_EXPORT2 UCNV_FROM_U_CALLBACK_ESCAPE (
                  const void *context,
                  UConverterFromUnicodeArgs *fromUArgs,
                  const UChar* codeUnits,
                  int32_t length,
                  UChar32 codePoint,
                  UConverterCallbackReason reason,
                  UErrorCode * err);

/**
 * DO NOT CALL THIS FUNCTION DIRECTLY!
 * This To Unicode callback skips any ILLEGAL_SEQUENCE, or
 * skips only UNASSINGED_SEQUENCE depending on the context parameter
 * simply ignoring those characters.
 *
 * @param context  The function currently recognizes the callback options:
 *                 UCNV_SKIP_STOP_ON_ILLEGAL: STOPS at the ILLEGAL_SEQUENCE,
 *                      returning the error code back to the caller immediately.
 *                 NULL: Skips any ILLEGAL_SEQUENCE
 * @param toUArgs Information about the conversion in progress
 * @param codeUnits Points to 'length' bytes of the concerned codepage sequence
 * @param length Size (in bytes) of the concerned codepage sequence
 * @param reason Defines the reason the callback was invoked
 * @param err Return value will be set to success if the callback was handled,
 *      otherwise this value will be set to a failure status.
 * @stable ICU 2.0
 */
U_STABLE void U_EXPORT2 UCNV_TO_U_CALLBACK_SKIP (
                  const void *context,
                  UConverterToUnicodeArgs *toUArgs,
                  const char* codeUnits,
                  int32_t length,
                  UConverterCallbackReason reason,
                  UErrorCode * err);

/**
 * DO NOT CALL THIS FUNCTION DIRECTLY!
 * This To Unicode callback will Substitute the ILLEGAL SEQUENCE,or
 * UNASSIGNED_SEQUENCE depending on context parameter,  with the
 * Unicode substitution character, U+FFFD.
 *
 * @param context  The function currently recognizes the callback options:
 *                 UCNV_SUB_STOP_ON_ILLEGAL: STOPS at the ILLEGAL_SEQUENCE,
 *                      returning the error code back to the caller immediately.
 *                 NULL: Substitutes any ILLEGAL_SEQUENCE
 * @param toUArgs Information about the conversion in progress
 * @param codeUnits Points to 'length' bytes of the concerned codepage sequence
 * @param length Size (in bytes) of the concerned codepage sequence
 * @param reason Defines the reason the callback was invoked
 * @param err Return value will be set to success if the callback was handled,
 *      otherwise this value will be set to a failure status.
 * @stable ICU 2.0
 */
U_STABLE void U_EXPORT2 UCNV_TO_U_CALLBACK_SUBSTITUTE (
                  const void *context,
                  UConverterToUnicodeArgs *toUArgs,
                  const char* codeUnits,
                  int32_t length,
                  UConverterCallbackReason reason,
                  UErrorCode * err);

/**
 * DO NOT CALL THIS FUNCTION DIRECTLY!
 * This To Unicode callback will Substitute the ILLEGAL SEQUENCE with the
 * hexadecimal representation of the illegal bytes
 *  (in the format  %XNN, e.g. "%XFF%X0A%XC8%X03").
 *
 * @param context This function currently recognizes the callback options:
 *      UCNV_ESCAPE_ICU, UCNV_ESCAPE_JAVA, UCNV_ESCAPE_C, UCNV_ESCAPE_XML_DEC,
 *      UCNV_ESCAPE_XML_HEX and UCNV_ESCAPE_UNICODE.
 * @param toUArgs Information about the conversion in progress
 * @param codeUnits Points to 'length' bytes of the concerned codepage sequence
 * @param length Size (in bytes) of the concerned codepage sequence
 * @param reason Defines the reason the callback was invoked
 * @param err Return value will be set to success if the callback was handled,
 *      otherwise this value will be set to a failure status.
 * @stable ICU 2.0
 */

U_STABLE void U_EXPORT2 UCNV_TO_U_CALLBACK_ESCAPE (
                  const void *context,
                  UConverterToUnicodeArgs *toUArgs,
                  const char* codeUnits,
                  int32_t length,
                  UConverterCallbackReason reason,
                  UErrorCode * err);

#endif

#endif

/*UCNV_ERR_H*/