SQLite

    while( *z && p1 ){
      SQLITE_SKIP_UTF8(z);
      p1--;
    }
    for(z2=z; *z2 && p2; p2--){
      SQLITE_SKIP_UTF8(z2);
    }
    sqlite3_result_text64(context, (char*)z, z2-z, SQLITE_TRANSIENT,
                          SQLITE_UTF8);
  }else{
    if( p1+p2>len ){
      p2 = len-p1;
      if( p2<0 ) p2 = 0;
    }
    sqlite3_result_blob64(context, (char*)&z[p1], (u64)p2, SQLITE_TRANSIENT);
  }
}

/*
** Implementation of the round() function
*/
#ifndef SQLITE_OMIT_FLOATING_POINT

    }else{
      *zOut++ = 0xF0 + (u8)((c>>18) & 0x07);
      *zOut++ = 0x80 + (u8)((c>>12) & 0x3F);
      *zOut++ = 0x80 + (u8)((c>>6) & 0x3F);
      *zOut++ = 0x80 + (u8)(c & 0x3F);
    }                                                    \
  }
  sqlite3_result_text64(context, (char*)z, zOut-z, sqlite3_free, SQLITE_UTF8);
}

/*
** The hex() function.  Interpret the argument as a blob.  Return
** a hexadecimal rendering as text.
*/
static void hexFunc(

  sqlite3_uri_int64,
  sqlite3_uri_parameter,
  sqlite3_vsnprintf,
  sqlite3_wal_checkpoint_v2,
  /* Version 3.8.7 and later */
  sqlite3_auto_extension,
  sqlite3_bind_blob64,
  sqlite3_bind_text64,
  sqlite3_cancel_auto_extension,
  sqlite3_load_extension,
  sqlite3_malloc64,
  sqlite3_msize,
  sqlite3_realloc64,
  sqlite3_reset_auto_extension,
  sqlite3_result_blob64,
  sqlite3_result_text64,
  sqlite3_strglob
};

/*
** Attempt to load an SQLite extension library contained in the file
** zFile.  The entry point is zProc.  zProc may be 0 in which case a
** default entry point name (sqlite3_extension_init) is used.  Use

** number of <u>bytes</u> in the value, not the number of characters.)^
** ^If the fourth parameter to sqlite3_bind_text() or sqlite3_bind_text16()
** is negative, then the length of the string is
** the number of bytes up to the first zero terminator.
** If the fourth parameter to sqlite3_bind_blob() is negative, then
** the behavior is undefined.
** If a non-negative fourth parameter is provided to sqlite3_bind_text()
** or sqlite3_bind_text16() or sqlite3_bind_text64() then
** that parameter must be the byte offset
** where the NUL terminator would occur assuming the string were NUL
** terminated.  If any NUL characters occur at byte offsets less than 
** the value of the fourth parameter then the resulting string value will
** contain embedded NULs.  The result of expressions involving strings
** with embedded NULs is undefined.
**
** ^The fifth argument to sqlite3_bind_blob(), sqlite3_bind_text(), and
** sqlite3_bind_text16() is a destructor used to dispose of the BLOB or
** string after SQLite has finished with it.  ^The destructor is called
** to dispose of the BLOB or string even if the call to sqlite3_bind_blob(),
** sqlite3_bind_text(), or sqlite3_bind_text16() fails.  
** ^If the fifth argument is
** the special value [SQLITE_STATIC], then SQLite assumes that the
** information is in static, unmanaged space and does not need to be freed.
** ^If the fifth argument has the value [SQLITE_TRANSIENT], then
** SQLite makes its own private copy of the data immediately, before
** the sqlite3_bind_*() routine returns.
**
** ^The sixth argument to sqlite3_bind_text64() must be one of
** [SQLITE_UTF8], [SQLITE_UTF16], [SQLITE_UTF16BE], or [SQLITE_UTF16LE]
** to specify the encoding of the text in the third parameter.  If
** the sixth argument to sqlite3_bind_text64() is not how of the
** allowed values shown above, or if the text encoding is different
** from the encoding specified by the sixth parameter, then the behavior
** is undefined.
**
** ^The sqlite3_bind_zeroblob() routine binds a BLOB of length N that
** is filled with zeroes.  ^A zeroblob uses a fixed amount of memory
** (just an integer to hold its size) while it is being processed.

                        void(*)(void*));
int sqlite3_bind_double(sqlite3_stmt*, int, double);
int sqlite3_bind_int(sqlite3_stmt*, int, int);
int sqlite3_bind_int64(sqlite3_stmt*, int, sqlite3_int64);
int sqlite3_bind_null(sqlite3_stmt*, int);
int sqlite3_bind_text(sqlite3_stmt*,int,const char*,int,void(*)(void*));
int sqlite3_bind_text16(sqlite3_stmt*, int, const void*, int, void(*)(void*));
int sqlite3_bind_text64(sqlite3_stmt*, int, const char*, sqlite3_uint64,
                         void(*)(void*), unsigned char encoding);
int sqlite3_bind_value(sqlite3_stmt*, int, const sqlite3_value*);
int sqlite3_bind_zeroblob(sqlite3_stmt*, int, int n);

/*
** CAPI3REF: Number Of SQL Parameters
**

** of the application-defined function to be NULL.
**
** ^The sqlite3_result_text(), sqlite3_result_text16(),
** sqlite3_result_text16le(), and sqlite3_result_text16be()
** set the return value of the application-defined function to be
** a text string which is represented as UTF-8, UTF-16 native byte order,
** UTF-16 little endian, or UTF-16 big endian, respectively.
** ^The sqlite3_result_text64() interface sets the return value of an
** application-defined function to be a text string in an encoding
** specified by the fifth (and last) parameter, which must be one
** of [SQLITE_UTF8], [SQLITE_UTF16], [SQLITE_UTF16BE], or [SQLITE_UTF16LE].
** ^SQLite takes the text result from the application from
** the 2nd parameter of the sqlite3_result_text* interfaces.
** ^If the 3rd parameter to the sqlite3_result_text* interfaces
** is negative, then SQLite takes result text from the 2nd parameter

void sqlite3_result_error_toobig(sqlite3_context*);
void sqlite3_result_error_nomem(sqlite3_context*);
void sqlite3_result_error_code(sqlite3_context*, int);
void sqlite3_result_int(sqlite3_context*, int);
void sqlite3_result_int64(sqlite3_context*, sqlite3_int64);
void sqlite3_result_null(sqlite3_context*);
void sqlite3_result_text(sqlite3_context*, const char*, int, void(*)(void*));
void sqlite3_result_text64(sqlite3_context*, const char*,sqlite3_uint64,
                           void(*)(void*), unsigned char encoding);
void sqlite3_result_text16(sqlite3_context*, const void*, int, void(*)(void*));
void sqlite3_result_text16le(sqlite3_context*, const void*, int,void(*)(void*));
void sqlite3_result_text16be(sqlite3_context*, const void*, int,void(*)(void*));
void sqlite3_result_value(sqlite3_context*, sqlite3_value*);
void sqlite3_result_zeroblob(sqlite3_context*, int n);

/*

  const char *(*uri_parameter)(const char*,const char*);
  char *(*vsnprintf)(int,char*,const char*,va_list);
  int (*wal_checkpoint_v2)(sqlite3*,const char*,int,int*,int*);
  /* Version 3.8.7 and later */
  int (*auto_extension)(void(*)(void));
  int (*bind_blob64)(sqlite3_stmt*,int,const void*,sqlite3_uint64,
                     void(*)(void*));
  int (*bind_text64)(sqlite3_stmt*,int,const char*,sqlite3_uint64,
                      void(*)(void*),unsigned char);
  int (*cancel_auto_extension)(void(*)(void));
  int (*load_extension)(sqlite3*,const char*,const char*,char**);
  void *(*malloc64)(sqlite3_uint64);
  sqlite3_uint64 (*msize)(void*);
  void *(*realloc64)(void*,sqlite3_uint64);
  void (*reset_auto_extension)(void);
  void (*result_blob64)(sqlite3_context*,const void*,sqlite3_uint64,
                        void(*)(void*));
  void (*result_text64)(sqlite3_context*,const char*,sqlite3_uint64,
                         void(*)(void*), unsigned char);
  int (*strglob)(const char*,const char*);
};

/*
** The following macros redefine the API routines so that they are
** redirected through the global sqlite3_api structure.

#define sqlite3_uri_int64              sqlite3_api->uri_int64
#define sqlite3_uri_parameter          sqlite3_api->uri_parameter
#define sqlite3_uri_vsnprintf          sqlite3_api->vsnprintf
#define sqlite3_wal_checkpoint_v2      sqlite3_api->wal_checkpoint_v2
/* Version 3.8.7 and later */
#define sqlite3_auto_extension         sqlite3_api->auto_extension
#define sqlite3_bind_blob64            sqlite3_api->bind_blob64
#define sqlite3_bind_text64            sqlite3_api->bind_text64
#define sqlite3_cancel_auto_extension  sqlite3_api->cancel_auto_extension
#define sqlite3_load_extension         sqlite3_api->load_extension
#define sqlite3_malloc64               sqlite3_api->malloc64
#define sqlite3_msize                  sqlite3_api->msize
#define sqlite3_realloc64              sqlite3_api->realloc64
#define sqlite3_reset_auto_extension   sqlite3_api->reset_auto_extension
#define sqlite3_result_blob64          sqlite3_api->result_blob64
#define sqlite3_result_text64          sqlite3_api->result_text64
#define sqlite3_strglob                sqlite3_api->strglob
#endif /* SQLITE_CORE */

#ifndef SQLITE_CORE
  /* This case when the file really is being compiled as a loadable 
  ** extension */
# define SQLITE_EXTENSION_INIT1     const sqlite3_api_routines *sqlite3_api=0;

  const char *z, 
  int n,
  void (*xDel)(void *)
){
  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
  setResultStrOrError(pCtx, z, n, SQLITE_UTF8, xDel);
}
void sqlite3_result_text64(
  sqlite3_context *pCtx, 
  const char *z, 
  sqlite3_uint64 n,
  void (*xDel)(void *),
  unsigned char enc
){
  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );

  int i, 
  const char *zData, 
  int nData, 
  void (*xDel)(void*)
){
  return bindText(pStmt, i, zData, nData, xDel, SQLITE_UTF8);
}
int sqlite3_bind_text64( 
  sqlite3_stmt *pStmt, 
  int i, 
  const char *zData, 
  sqlite3_uint64 nData, 
  void (*xDel)(void*),
  unsigned char enc
){