1 /*

     2 *******************************************************************************

     3 *

     4 *   Copyright (C) 1999-2005, International Business Machines

     5 *   Corporation and others.  All Rights Reserved.

     6 *

     7 *******************************************************************************

     8 *   file name:  utf8.h

     9 *   encoding:   US-ASCII

    10 *   tab size:   8 (not used)

    11 *   indentation:4

    12 *

    13 *   created on: 1999sep13

    14 *   created by: Markus W. Scherer

    15 */

    16 

    17 /**

    18  * \file

    19  * \brief C API: 8-bit Unicode handling macros

    20  * 

    21  * This file defines macros to deal with 8-bit Unicode (UTF-8) code units (bytes) and strings.

    22  * utf8.h is included by utf.h after unicode/umachine.h

    23  * and some common definitions.

    24  *

    25  * For more information see utf.h and the ICU User Guide Strings chapter

    26  * (http://icu.sourceforge.net/userguide/strings.html).

    27  *

    28  * <em>Usage:</em>

    29  * ICU coding guidelines for if() statements should be followed when using these macros.

    30  * Compound statements (curly braces {}) must be used  for if-else-while... 

    31  * bodies and all macro statements should be terminated with semicolon.

    32  */

    33 

    34 #ifndef __UTF8_H__

    35 #define __UTF8_H__

    36 

    37 /* utf.h must be included first. */

    38 #ifndef __UTF_H__

    39 #   include "unicode/utf.h"

    40 #endif

    41 

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

    43 

    44 /**

    45  * \var utf8_countTrailBytes

    46  * Internal array with numbers of trail bytes for any given byte used in

    47  * lead byte position.

    48  * @internal

    49  */

    50 #ifdef U_UTF8_IMPL

    51 U_INTERNAL const uint8_t 

    52 #elif defined(U_STATIC_IMPLEMENTATION)

    53 U_CFUNC const uint8_t

    54 #else

    55 U_CFUNC U_IMPORT const uint8_t /* U_IMPORT2? */ /*U_IMPORT*/ 

    56 #endif

    57 utf8_countTrailBytes[256];

    58 

    59 /**

    60  * Count the trail bytes for a UTF-8 lead byte.

    61  * @internal

    62  */

    63 #define U8_COUNT_TRAIL_BYTES(leadByte) (utf8_countTrailBytes[(uint8_t)leadByte])

    64 

    65 /**

    66  * Mask a UTF-8 lead byte, leave only the lower bits that form part of the code point value.

    67  * @internal

    68  */

    69 #define U8_MASK_LEAD_BYTE(leadByte, countTrailBytes) ((leadByte)&=(1<<(6-(countTrailBytes)))-1)

    70 

    71 /**

    72  * Function for handling "next code point" with error-checking.

    73  * @internal

    74  */

    75 U_INTERNAL UChar32 U_EXPORT2

    76 utf8_nextCharSafeBody(const uint8_t *s, int32_t *pi, int32_t length, UChar32 c, UBool strict);

    77 

    78 /**

    79  * Function for handling "append code point" with error-checking.

    80  * @internal

    81  */

    82 U_INTERNAL int32_t U_EXPORT2

    83 utf8_appendCharSafeBody(uint8_t *s, int32_t i, int32_t length, UChar32 c, UBool *pIsError);

    84 

    85 /**

    86  * Function for handling "previous code point" with error-checking.

    87  * @internal

    88  */

    89 U_INTERNAL UChar32 U_EXPORT2

    90 utf8_prevCharSafeBody(const uint8_t *s, int32_t start, int32_t *pi, UChar32 c, UBool strict);

    91 

    92 /**

    93  * Function for handling "skip backward one code point" with error-checking.

    94  * @internal

    95  */

    96 U_INTERNAL int32_t U_EXPORT2

    97 utf8_back1SafeBody(const uint8_t *s, int32_t start, int32_t i);

    98 

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

   100 

   101 /**

   102  * Does this code unit (byte) encode a code point by itself (US-ASCII 0..0x7f)?

   103  * @param c 8-bit code unit (byte)

   104  * @return TRUE or FALSE

   105  * @stable ICU 2.4

   106  */

   107 #define U8_IS_SINGLE(c) (((c)&0x80)==0)

   108 

   109 /**

   110  * Is this code unit (byte) a UTF-8 lead byte?

   111  * @param c 8-bit code unit (byte)

   112  * @return TRUE or FALSE

   113  * @stable ICU 2.4

   114  */

   115 #define U8_IS_LEAD(c) ((uint8_t)((c)-0xc0)<0x3e)

   116 

   117 /**

   118  * Is this code unit (byte) a UTF-8 trail byte?

   119  * @param c 8-bit code unit (byte)

   120  * @return TRUE or FALSE

   121  * @stable ICU 2.4

   122  */

   123 #define U8_IS_TRAIL(c) (((c)&0xc0)==0x80)

   124 

   125 /**

   126  * How many code units (bytes) are used for the UTF-8 encoding

   127  * of this Unicode code point?

   128  * @param c 32-bit code point

   129  * @return 1..4, or 0 if c is a surrogate or not a Unicode code point

   130  * @stable ICU 2.4

   131  */

   132 #define U8_LENGTH(c) \

   133     ((uint32_t)(c)<=0x7f ? 1 : \

   134         ((uint32_t)(c)<=0x7ff ? 2 : \

   135             ((uint32_t)(c)<=0xd7ff ? 3 : \

   136                 ((uint32_t)(c)<=0xdfff || (uint32_t)(c)>0x10ffff ? 0 : \

   137                     ((uint32_t)(c)<=0xffff ? 3 : 4)\

   138                 ) \

   139             ) \

   140         ) \

   141     )

   142 

   143 /**

   144  * The maximum number of UTF-8 code units (bytes) per Unicode code point (U+0000..U+10ffff).

   145  * @return 4

   146  * @stable ICU 2.4

   147  */

   148 #define U8_MAX_LENGTH 4

   149 

   150 /**

   151  * Get a code point from a string at a random-access offset,

   152  * without changing the offset.

   153  * The offset may point to either the lead byte or one of the trail bytes

   154  * for a code point, in which case the macro will read all of the bytes

   155  * for the code point.

   156  * The result is undefined if the offset points to an illegal UTF-8

   157  * byte sequence.

   158  * Iteration through a string is more efficient with U8_NEXT_UNSAFE or U8_NEXT.

   159  *

   160  * @param s const uint8_t * string

   161  * @param i string offset

   162  * @param c output UChar32 variable

   163  * @see U8_GET

   164  * @stable ICU 2.4

   165  */

   166 #define U8_GET_UNSAFE(s, i, c) { \

   167     int32_t _u8_get_unsafe_index=(int32_t)(i); \

   168     U8_SET_CP_START_UNSAFE(s, _u8_get_unsafe_index); \

   169     U8_NEXT_UNSAFE(s, _u8_get_unsafe_index, c); \

   170 }

   171 

   172 /**

   173  * Get a code point from a string at a random-access offset,

   174  * without changing the offset.

   175  * The offset may point to either the lead byte or one of the trail bytes

   176  * for a code point, in which case the macro will read all of the bytes

   177  * for the code point.

   178  * If the offset points to an illegal UTF-8 byte sequence, then

   179  * c is set to a negative value.

   180  * Iteration through a string is more efficient with U8_NEXT_UNSAFE or U8_NEXT.

   181  *

   182  * @param s const uint8_t * string

   183  * @param start starting string offset

   184  * @param i string offset, start<=i<length

   185  * @param length string length

   186  * @param c output UChar32 variable, set to <0 in case of an error

   187  * @see U8_GET_UNSAFE

   188  * @stable ICU 2.4

   189  */

   190 #define U8_GET(s, start, i, length, c) { \

   191     int32_t _u8_get_index=(int32_t)(i); \

   192     U8_SET_CP_START(s, start, _u8_get_index); \

   193     U8_NEXT(s, _u8_get_index, length, c); \

   194 }

   195 

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

   197 

   198 /**

   199  * Get a code point from a string at a code point boundary offset,

   200  * and advance the offset to the next code point boundary.

   201  * (Post-incrementing forward iteration.)

   202  * "Unsafe" macro, assumes well-formed UTF-8.

   203  *

   204  * The offset may point to the lead byte of a multi-byte sequence,

   205  * in which case the macro will read the whole sequence.

   206  * The result is undefined if the offset points to a trail byte

   207  * or an illegal UTF-8 sequence.

   208  *

   209  * @param s const uint8_t * string

   210  * @param i string offset

   211  * @param c output UChar32 variable

   212  * @see U8_NEXT

   213  * @stable ICU 2.4

   214  */

   215 #define U8_NEXT_UNSAFE(s, i, c) { \

   216     (c)=(s)[(i)++]; \

   217     if((uint8_t)((c)-0xc0)<0x35) { \

   218         uint8_t __count=U8_COUNT_TRAIL_BYTES(c); \

   219         U8_MASK_LEAD_BYTE(c, __count); \

   220         switch(__count) { \

   221         /* each following branch falls through to the next one */ \

   222         case 3: \

   223             (c)=((c)<<6)|((s)[(i)++]&0x3f); \

   224         case 2: \

   225             (c)=((c)<<6)|((s)[(i)++]&0x3f); \

   226         case 1: \

   227             (c)=((c)<<6)|((s)[(i)++]&0x3f); \

   228         /* no other branches to optimize switch() */ \

   229             break; \

   230         } \

   231     } \

   232 }

   233 

   234 /**

   235  * Get a code point from a string at a code point boundary offset,

   236  * and advance the offset to the next code point boundary.

   237  * (Post-incrementing forward iteration.)

   238  * "Safe" macro, checks for illegal sequences and for string boundaries.

   239  *

   240  * The offset may point to the lead byte of a multi-byte sequence,

   241  * in which case the macro will read the whole sequence.

   242  * If the offset points to a trail byte or an illegal UTF-8 sequence, then

   243  * c is set to a negative value.

   244  *

   245  * @param s const uint8_t * string

   246  * @param i string offset, i<length

   247  * @param length string length

   248  * @param c output UChar32 variable, set to <0 in case of an error

   249  * @see U8_NEXT_UNSAFE

   250  * @stable ICU 2.4

   251  */

   252 #define U8_NEXT(s, i, length, c) { \

   253     (c)=(s)[(i)++]; \

   254     if(((uint8_t)(c))>=0x80) { \

   255         if(U8_IS_LEAD(c)) { \

   256             (c)=utf8_nextCharSafeBody((const uint8_t *)s, &(i), (int32_t)(length), c, -1); \

   257         } else { \

   258             (c)=U_SENTINEL; \

   259         } \

   260     } \

   261 }

   262 

   263 /**

   264  * Append a code point to a string, overwriting 1 to 4 bytes.

   265  * The offset points to the current end of the string contents

   266  * and is advanced (post-increment).

   267  * "Unsafe" macro, assumes a valid code point and sufficient space in the string.

   268  * Otherwise, the result is undefined.

   269  *

   270  * @param s const uint8_t * string buffer

   271  * @param i string offset

   272  * @param c code point to append

   273  * @see U8_APPEND

   274  * @stable ICU 2.4

   275  */

   276 #define U8_APPEND_UNSAFE(s, i, c) { \

   277     if((uint32_t)(c)<=0x7f) { \

   278         (s)[(i)++]=(uint8_t)(c); \

   279     } else { \

   280         if((uint32_t)(c)<=0x7ff) { \

   281             (s)[(i)++]=(uint8_t)(((c)>>6)|0xc0); \

   282         } else { \

   283             if((uint32_t)(c)<=0xffff) { \

   284                 (s)[(i)++]=(uint8_t)(((c)>>12)|0xe0); \

   285             } else { \

   286                 (s)[(i)++]=(uint8_t)(((c)>>18)|0xf0); \

   287                 (s)[(i)++]=(uint8_t)((((c)>>12)&0x3f)|0x80); \

   288             } \

   289             (s)[(i)++]=(uint8_t)((((c)>>6)&0x3f)|0x80); \

   290         } \

   291         (s)[(i)++]=(uint8_t)(((c)&0x3f)|0x80); \

   292     } \

   293 }

   294 

   295 /**

   296  * Append a code point to a string, overwriting 1 or 2 code units.

   297  * The offset points to the current end of the string contents

   298  * and is advanced (post-increment).

   299  * "Safe" macro, checks for a valid code point.

   300  * If a non-ASCII code point is written, checks for sufficient space in the string.

   301  * If the code point is not valid or trail bytes do not fit,

   302  * then isError is set to TRUE.

   303  *

   304  * @param s const uint8_t * string buffer

   305  * @param i string offset, i<length

   306  * @param length size of the string buffer

   307  * @param c code point to append

   308  * @param isError output UBool set to TRUE if an error occurs, otherwise not modified

   309  * @see U8_APPEND_UNSAFE

   310  * @stable ICU 2.4

   311  */

   312 #define U8_APPEND(s, i, length, c, isError) { \

   313     if((uint32_t)(c)<=0x7f) { \

   314         (s)[(i)++]=(uint8_t)(c); \

   315     } else { \

   316         (i)=utf8_appendCharSafeBody(s, (int32_t)(i), (int32_t)(length), c, &(isError)); \

   317     } \

   318 }

   319 

   320 /**

   321  * Advance the string offset from one code point boundary to the next.

   322  * (Post-incrementing iteration.)

   323  * "Unsafe" macro, assumes well-formed UTF-8.

   324  *

   325  * @param s const uint8_t * string

   326  * @param i string offset

   327  * @see U8_FWD_1

   328  * @stable ICU 2.4

   329  */

   330 #define U8_FWD_1_UNSAFE(s, i) { \

   331     (i)+=1+U8_COUNT_TRAIL_BYTES((s)[i]); \

   332 }

   333 

   334 /**

   335  * Advance the string offset from one code point boundary to the next.

   336  * (Post-incrementing iteration.)

   337  * "Safe" macro, checks for illegal sequences and for string boundaries.

   338  *

   339  * @param s const uint8_t * string

   340  * @param i string offset, i<length

   341  * @param length string length

   342  * @see U8_FWD_1_UNSAFE

   343  * @stable ICU 2.4

   344  */

   345 #define U8_FWD_1(s, i, length) { \

   346     uint8_t __b=(s)[(i)++]; \

   347     if(U8_IS_LEAD(__b)) { \

   348         uint8_t __count=U8_COUNT_TRAIL_BYTES(__b); \

   349         if((i)+__count>(length)) { \

   350             __count=(uint8_t)((length)-(i)); \

   351         } \

   352         while(__count>0 && U8_IS_TRAIL((s)[i])) { \

   353             ++(i); \

   354             --__count; \

   355         } \

   356     } \

   357 }

   358 

   359 /**

   360  * Advance the string offset from one code point boundary to the n-th next one,

   361  * i.e., move forward by n code points.

   362  * (Post-incrementing iteration.)

   363  * "Unsafe" macro, assumes well-formed UTF-8.

   364  *

   365  * @param s const uint8_t * string

   366  * @param i string offset

   367  * @param n number of code points to skip

   368  * @see U8_FWD_N

   369  * @stable ICU 2.4

   370  */

   371 #define U8_FWD_N_UNSAFE(s, i, n) { \

   372     int32_t __N=(n); \

   373     while(__N>0) { \

   374         U8_FWD_1_UNSAFE(s, i); \

   375         --__N; \

   376     } \

   377 }

   378 

   379 /**

   380  * Advance the string offset from one code point boundary to the n-th next one,

   381  * i.e., move forward by n code points.

   382  * (Post-incrementing iteration.)

   383  * "Safe" macro, checks for illegal sequences and for string boundaries.

   384  *

   385  * @param s const uint8_t * string

   386  * @param i string offset, i<length

   387  * @param length string length

   388  * @param n number of code points to skip

   389  * @see U8_FWD_N_UNSAFE

   390  * @stable ICU 2.4

   391  */

   392 #define U8_FWD_N(s, i, length, n) { \

   393     int32_t __N=(n); \

   394     while(__N>0 && (i)<(length)) { \

   395         U8_FWD_1(s, i, length); \

   396         --__N; \

   397     } \

   398 }

   399 

   400 /**

   401  * Adjust a random-access offset to a code point boundary

   402  * at the start of a code point.

   403  * If the offset points to a UTF-8 trail byte,

   404  * then the offset is moved backward to the corresponding lead byte.

   405  * Otherwise, it is not modified.

   406  * "Unsafe" macro, assumes well-formed UTF-8.

   407  *

   408  * @param s const uint8_t * string

   409  * @param i string offset

   410  * @see U8_SET_CP_START

   411  * @stable ICU 2.4

   412  */

   413 #define U8_SET_CP_START_UNSAFE(s, i) { \

   414     while(U8_IS_TRAIL((s)[i])) { --(i); } \

   415 }

   416 

   417 /**

   418  * Adjust a random-access offset to a code point boundary

   419  * at the start of a code point.

   420  * If the offset points to a UTF-8 trail byte,

   421  * then the offset is moved backward to the corresponding lead byte.

   422  * Otherwise, it is not modified.

   423  * "Safe" macro, checks for illegal sequences and for string boundaries.

   424  *

   425  * @param s const uint8_t * string

   426  * @param start starting string offset (usually 0)

   427  * @param i string offset, start<=i

   428  * @see U8_SET_CP_START_UNSAFE

   429  * @stable ICU 2.4

   430  */

   431 #define U8_SET_CP_START(s, start, i) { \

   432     if(U8_IS_TRAIL((s)[(i)])) { \

   433         (i)=utf8_back1SafeBody(s, start, (int32_t)(i)); \

   434     } \

   435 }

   436 

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

   438 

   439 /**

   440  * Move the string offset from one code point boundary to the previous one

   441  * and get the code point between them.

   442  * (Pre-decrementing backward iteration.)

   443  * "Unsafe" macro, assumes well-formed UTF-8.

   444  *

   445  * The input offset may be the same as the string length.

   446  * If the offset is behind a multi-byte sequence, then the macro will read

   447  * the whole sequence.

   448  * If the offset is behind a lead byte, then that itself

   449  * will be returned as the code point.

   450  * The result is undefined if the offset is behind an illegal UTF-8 sequence.

   451  *

   452  * @param s const uint8_t * string

   453  * @param i string offset

   454  * @param c output UChar32 variable

   455  * @see U8_PREV

   456  * @stable ICU 2.4

   457  */

   458 #define U8_PREV_UNSAFE(s, i, c) { \

   459     (c)=(s)[--(i)]; \

   460     if(U8_IS_TRAIL(c)) { \

   461         uint8_t __b, __count=1, __shift=6; \

   462 \

   463         /* c is a trail byte */ \

   464         (c)&=0x3f; \

   465         for(;;) { \

   466             __b=(s)[--(i)]; \

   467             if(__b>=0xc0) { \

   468                 U8_MASK_LEAD_BYTE(__b, __count); \

   469                 (c)|=(UChar32)__b<<__shift; \

   470                 break; \

   471             } else { \

   472                 (c)|=(UChar32)(__b&0x3f)<<__shift; \

   473                 ++__count; \

   474                 __shift+=6; \

   475             } \

   476         } \

   477     } \

   478 }

   479 

   480 /**

   481  * Move the string offset from one code point boundary to the previous one

   482  * and get the code point between them.

   483  * (Pre-decrementing backward iteration.)

   484  * "Safe" macro, checks for illegal sequences and for string boundaries.

   485  *

   486  * The input offset may be the same as the string length.

   487  * If the offset is behind a multi-byte sequence, then the macro will read

   488  * the whole sequence.

   489  * If the offset is behind a lead byte, then that itself

   490  * will be returned as the code point.

   491  * If the offset is behind an illegal UTF-8 sequence, then c is set to a negative value.

   492  *

   493  * @param s const uint8_t * string

   494  * @param start starting string offset (usually 0)

   495  * @param i string offset, start<=i

   496  * @param c output UChar32 variable, set to <0 in case of an error

   497  * @see U8_PREV_UNSAFE

   498  * @stable ICU 2.4

   499  */

   500 #define U8_PREV(s, start, i, c) { \

   501     (c)=(s)[--(i)]; \

   502     if((c)>=0x80) { \

   503         if((c)<=0xbf) { \

   504             (c)=utf8_prevCharSafeBody(s, start, &(i), c, -1); \

   505         } else { \

   506             (c)=U_SENTINEL; \

   507         } \

   508     } \

   509 }

   510 

   511 /**

   512  * Move the string offset from one code point boundary to the previous one.

   513  * (Pre-decrementing backward iteration.)

   514  * The input offset may be the same as the string length.

   515  * "Unsafe" macro, assumes well-formed UTF-8.

   516  *

   517  * @param s const uint8_t * string

   518  * @param i string offset

   519  * @see U8_BACK_1

   520  * @stable ICU 2.4

   521  */

   522 #define U8_BACK_1_UNSAFE(s, i) { \

   523     while(U8_IS_TRAIL((s)[--(i)])) {} \

   524 }

   525 

   526 /**

   527  * Move the string offset from one code point boundary to the previous one.

   528  * (Pre-decrementing backward iteration.)

   529  * The input offset may be the same as the string length.

   530  * "Safe" macro, checks for illegal sequences and for string boundaries.

   531  *

   532  * @param s const uint8_t * string

   533  * @param start starting string offset (usually 0)

   534  * @param i string offset, start<=i

   535  * @see U8_BACK_1_UNSAFE

   536  * @stable ICU 2.4

   537  */

   538 #define U8_BACK_1(s, start, i) { \

   539     if(U8_IS_TRAIL((s)[--(i)])) { \

   540         (i)=utf8_back1SafeBody(s, start, (int32_t)(i)); \

   541     } \

   542 }

   543 

   544 /**

   545  * Move the string offset from one code point boundary to the n-th one before it,

   546  * i.e., move backward by n code points.

   547  * (Pre-decrementing backward iteration.)

   548  * The input offset may be the same as the string length.

   549  * "Unsafe" macro, assumes well-formed UTF-8.

   550  *

   551  * @param s const uint8_t * string

   552  * @param i string offset

   553  * @param n number of code points to skip

   554  * @see U8_BACK_N

   555  * @stable ICU 2.4

   556  */

   557 #define U8_BACK_N_UNSAFE(s, i, n) { \

   558     int32_t __N=(n); \

   559     while(__N>0) { \

   560         U8_BACK_1_UNSAFE(s, i); \

   561         --__N; \

   562     } \

   563 }

   564 

   565 /**

   566  * Move the string offset from one code point boundary to the n-th one before it,

   567  * i.e., move backward by n code points.

   568  * (Pre-decrementing backward iteration.)

   569  * The input offset may be the same as the string length.

   570  * "Safe" macro, checks for illegal sequences and for string boundaries.

   571  *

   572  * @param s const uint8_t * string

   573  * @param start index of the start of the string

   574  * @param i string offset, i<length

   575  * @param n number of code points to skip

   576  * @see U8_BACK_N_UNSAFE

   577  * @stable ICU 2.4

   578  */

   579 #define U8_BACK_N(s, start, i, n) { \

   580     int32_t __N=(n); \

   581     while(__N>0 && (i)>(start)) { \

   582         U8_BACK_1(s, start, i); \

   583         --__N; \

   584     } \

   585 }

   586 

   587 /**

   588  * Adjust a random-access offset to a code point boundary after a code point.

   589  * If the offset is behind a partial multi-byte sequence,

   590  * then the offset is incremented to behind the whole sequence.

   591  * Otherwise, it is not modified.

   592  * The input offset may be the same as the string length.

   593  * "Unsafe" macro, assumes well-formed UTF-8.

   594  *

   595  * @param s const uint8_t * string

   596  * @param i string offset

   597  * @see U8_SET_CP_LIMIT

   598  * @stable ICU 2.4

   599  */

   600 #define U8_SET_CP_LIMIT_UNSAFE(s, i) { \

   601     U8_BACK_1_UNSAFE(s, i); \

   602     U8_FWD_1_UNSAFE(s, i); \

   603 }

   604 

   605 /**

   606  * Adjust a random-access offset to a code point boundary after a code point.

   607  * If the offset is behind a partial multi-byte sequence,

   608  * then the offset is incremented to behind the whole sequence.

   609  * Otherwise, it is not modified.

   610  * The input offset may be the same as the string length.

   611  * "Safe" macro, checks for illegal sequences and for string boundaries.

   612  *

   613  * @param s const uint8_t * string

   614  * @param start starting string offset (usually 0)

   615  * @param i string offset, start<=i<=length

   616  * @param length string length

   617  * @see U8_SET_CP_LIMIT_UNSAFE

   618  * @stable ICU 2.4

   619  */

   620 #define U8_SET_CP_LIMIT(s, start, i, length) { \

   621     if((start)<(i) && (i)<(length)) { \

   622         U8_BACK_1(s, start, i); \

   623         U8_FWD_1(s, i, length); \

   624     } \

   625 }

   626 

   627 #endif