if( (iAdj+nToken)>nDocsize ) iAdj = nDocsize - nToken;
    if( iAdj<0 ) iAdj = 0;
    *piPos = iAdj;
  }

  return rc;
}











/*
** Implementation of snippet() function.
*/
static void fts5SnippetFunction(
  const Fts5ExtensionApi *pApi,   /* API offered by current FTS version */
  Fts5Context *pFts,              /* First arg to pass to pApi functions */
................................................................................
    sqlite3_result_error(pCtx, zErr, -1);
    return;
  }

  nCol = pApi->xColumnCount(pFts);
  memset(&ctx, 0, sizeof(HighlightContext));
  iCol = sqlite3_value_int(apVal[0]);
  ctx.zOpen = (const char*)sqlite3_value_text(apVal[1]);
  ctx.zClose = (const char*)sqlite3_value_text(apVal[2]);
  zEllips = (const char*)sqlite3_value_text(apVal[3]);
  nToken = sqlite3_value_int(apVal[4]);

  iBestCol = (iCol>=0 ? iCol : 0);
  nPhrase = pApi->xPhraseCount(pFts);
  aSeen = sqlite3_malloc(nPhrase);
  if( aSeen==0 ){
    rc = SQLITE_NOMEM;

    if( (iAdj+nToken)>nDocsize ) iAdj = nDocsize - nToken;
    if( iAdj<0 ) iAdj = 0;
    *piPos = iAdj;
  }

  return rc;
}

/*
** Return the value in pVal interpreted as utf-8 text. Except, if pVal 
** contains a NULL value, return a pointer to a static string zero
** bytes in length instead of a NULL pointer.
*/
static const char *fts5ValueToText(sqlite3_value *pVal){
  const char *zRet = (const char*)sqlite3_value_text(pVal);
  return zRet ? zRet : "";
}

/*
** Implementation of snippet() function.
*/
static void fts5SnippetFunction(
  const Fts5ExtensionApi *pApi,   /* API offered by current FTS version */
  Fts5Context *pFts,              /* First arg to pass to pApi functions */
................................................................................
    sqlite3_result_error(pCtx, zErr, -1);
    return;
  }

  nCol = pApi->xColumnCount(pFts);
  memset(&ctx, 0, sizeof(HighlightContext));
  iCol = sqlite3_value_int(apVal[0]);
  ctx.zOpen = fts5ValueToText(apVal[1]);
  ctx.zClose = fts5ValueToText(apVal[2]);
  zEllips = fts5ValueToText(apVal[3]);
  nToken = sqlite3_value_int(apVal[4]);

  iBestCol = (iCol>=0 ? iCol : 0);
  nPhrase = pApi->xPhraseCount(pFts);
  aSeen = sqlite3_malloc(nPhrase);
  if( aSeen==0 ){
    rc = SQLITE_NOMEM;

    'x a a a a a a a a a a',
    'a a a a a a a a a a a a a a a a a a a x'
  );
}
do_execsql_test 5.1 {
  SELECT snippet(p1, 0, '[', ']', '...', 6) FROM p1('x');
} {{[x] a a a a a...}}











} ;# foreach_detail_mode 

finish_test

    'x a a a a a a a a a a',
    'a a a a a a a a a a a a a a a a a a a x'
  );
}
do_execsql_test 5.1 {
  SELECT snippet(p1, 0, '[', ']', '...', 6) FROM p1('x');
} {{[x] a a a a a...}}

do_execsql_test 5.2 {
  SELECT snippet(p1, 0, '[', ']', NULL, 6) FROM p1('x');
} {{[x] a a a a a}}
do_execsql_test 5.3 {
  SELECT snippet(p1, 0, NULL, ']', '...', 6) FROM p1('x');
} {{x] a a a a a...}}
do_execsql_test 5.4 {
  SELECT snippet(p1, 0, '[', NULL, '...', 6) FROM p1('x');
} {{[x a a a a a...}}

} ;# foreach_detail_mode 

finish_test

      assert(pParse->nTab==1);
      sqlite3MayAbort(pParse);
      sqlite3VdbeAddOp3(v, OP_OpenWrite, 1, pParse->regRoot, iDb);
      sqlite3VdbeChangeP5(v, OPFLAG_P2ISREG);
      pParse->nTab = 2;
      addrTop = sqlite3VdbeCurrentAddr(v) + 1;
      sqlite3VdbeAddOp3(v, OP_InitCoroutine, regYield, 0, addrTop);

      pSelTab = sqlite3ResultSetOfSelect(pParse, pSelect);
      if( pSelTab==0 ) return;
      assert( p->aCol==0 );
      p->nCol = pSelTab->nCol;
      p->aCol = pSelTab->aCol;
      pSelTab->nCol = 0;
      pSelTab->aCol = 0;
      sqlite3DeleteTable(db, pSelTab);
      sqlite3SelectDestInit(&dest, SRT_Coroutine, regYield);
      sqlite3Select(pParse, pSelect, &dest);

      sqlite3VdbeEndCoroutine(v, regYield);
      sqlite3VdbeJumpHere(v, addrTop - 1);
      addrInsLoop = sqlite3VdbeAddOp1(v, OP_Yield, dest.iSDParm);
      VdbeCoverage(v);
      sqlite3VdbeAddOp3(v, OP_MakeRecord, dest.iSdst, dest.nSdst, regRec);
      sqlite3TableAffinity(v, p, 0);
      sqlite3VdbeAddOp2(v, OP_NewRowid, 1, regRowid);

      assert(pParse->nTab==1);
      sqlite3MayAbort(pParse);
      sqlite3VdbeAddOp3(v, OP_OpenWrite, 1, pParse->regRoot, iDb);
      sqlite3VdbeChangeP5(v, OPFLAG_P2ISREG);
      pParse->nTab = 2;
      addrTop = sqlite3VdbeCurrentAddr(v) + 1;
      sqlite3VdbeAddOp3(v, OP_InitCoroutine, regYield, 0, addrTop);
      if( pParse->nErr ) return;
      pSelTab = sqlite3ResultSetOfSelect(pParse, pSelect);
      if( pSelTab==0 ) return;
      assert( p->aCol==0 );
      p->nCol = pSelTab->nCol;
      p->aCol = pSelTab->aCol;
      pSelTab->nCol = 0;
      pSelTab->aCol = 0;
      sqlite3DeleteTable(db, pSelTab);
      sqlite3SelectDestInit(&dest, SRT_Coroutine, regYield);
      sqlite3Select(pParse, pSelect, &dest);
      if( pParse->nErr ) return;
      sqlite3VdbeEndCoroutine(v, regYield);
      sqlite3VdbeJumpHere(v, addrTop - 1);
      addrInsLoop = sqlite3VdbeAddOp1(v, OP_Yield, dest.iSDParm);
      VdbeCoverage(v);
      sqlite3VdbeAddOp3(v, OP_MakeRecord, dest.iSdst, dest.nSdst, regRec);
      sqlite3TableAffinity(v, p, 0);
      sqlite3VdbeAddOp2(v, OP_NewRowid, 1, regRowid);

    return 1;
  }
  a = (unsigned char *)zLeft;
  b = (unsigned char *)zRight;
  while( N-- > 0 && *a!=0 && UpperToLower[*a]==UpperToLower[*b]){ a++; b++; }
  return N<0 ? 0 : UpperToLower[*a] - UpperToLower[*b];
}



















/*
** The string z[] is an text representation of a real number.
** Convert this string to a double and write it into *pResult.
**
** The string z[] is length bytes in length (bytes, not characters) and
** uses the encoding enc.  The string is not necessarily zero-terminated.
................................................................................

    /* adjust the sign of significand */
    s = sign<0 ? -s : s;

    if( e==0 ){                                         /*OPTIMIZATION-IF-TRUE*/
      result = (double)s;
    }else{
      LONGDOUBLE_TYPE scale = 1.0;
      /* attempt to handle extremely small/large numbers better */
      if( e>307 ){                                      /*OPTIMIZATION-IF-TRUE*/
        if( e<342 ){                                    /*OPTIMIZATION-IF-TRUE*/
          while( e%308 ) { scale *= 1.0e+1; e -= 1; }
          if( esign<0 ){
            result = s / scale;
            result /= 1.0e+308;
          }else{
            result = s * scale;
            result *= 1.0e+308;
          }
................................................................................
            result = INFINITY*s;
#else
            result = 1e308*1e308*s;  /* Infinity */
#endif
          }
        }
      }else{
        /* 1.0e+22 is the largest power of 10 than can be 
        ** represented exactly. */
        while( e%22 ) { scale *= 1.0e+1; e -= 1; }
        while( e>0 ) { scale *= 1.0e+22; e -= 22; }
        if( esign<0 ){
          result = s / scale;
        }else{
          result = s * scale;
        }
      }
    }

    return 1;
  }
  a = (unsigned char *)zLeft;
  b = (unsigned char *)zRight;
  while( N-- > 0 && *a!=0 && UpperToLower[*a]==UpperToLower[*b]){ a++; b++; }
  return N<0 ? 0 : UpperToLower[*a] - UpperToLower[*b];
}

/*
** Compute 10 to the E-th power.  Examples:  E==1 results in 10.
** E==2 results in 100.  E==50 results in 1.0e50.
**
** This routine only works for values of E between 1 and 341.
*/
static LONGDOUBLE_TYPE sqlite3Pow10(int E){
  LONGDOUBLE_TYPE x = 10.0;
  LONGDOUBLE_TYPE r = 1.0;
  while(1){
    if( E & 1 ) r *= x;
    E >>= 1;
    if( E==0 ) break;
    x *= x;
  }
  return r; 
}

/*
** The string z[] is an text representation of a real number.
** Convert this string to a double and write it into *pResult.
**
** The string z[] is length bytes in length (bytes, not characters) and
** uses the encoding enc.  The string is not necessarily zero-terminated.
................................................................................

    /* adjust the sign of significand */
    s = sign<0 ? -s : s;

    if( e==0 ){                                         /*OPTIMIZATION-IF-TRUE*/
      result = (double)s;
    }else{

      /* attempt to handle extremely small/large numbers better */
      if( e>307 ){                                      /*OPTIMIZATION-IF-TRUE*/
        if( e<342 ){                                    /*OPTIMIZATION-IF-TRUE*/
          LONGDOUBLE_TYPE scale = sqlite3Pow10(e-308);
          if( esign<0 ){
            result = s / scale;
            result /= 1.0e+308;
          }else{
            result = s * scale;
            result *= 1.0e+308;
          }
................................................................................
            result = INFINITY*s;
#else
            result = 1e308*1e308*s;  /* Infinity */
#endif
          }
        }
      }else{
        LONGDOUBLE_TYPE scale = sqlite3Pow10(e);



        if( esign<0 ){
          result = s / scale;
        }else{
          result = s * scale;
        }
      }
    }

  execsql2 {SELECT BBb FROM (SELECT aaa AS Bbb FROM t1)}
} {Bbb 123}
do_execsql_test colname-9.320 {
  CREATE TABLE t2 AS SELECT BBb FROM (SELECT aaa AS Bbb FROM t1);
  SELECT name FROM pragma_table_info('t2');
} {Bbb}





















# Make sure the quotation marks get removed from the column names
# when constructing a new table from an aggregate SELECT.
# Email from Juergen Palm on 2017-07-11.
#
do_execsql_test colname-10.100 {
  DROP TABLE IF EXISTS t1;

  execsql2 {SELECT BBb FROM (SELECT aaa AS Bbb FROM t1)}
} {Bbb 123}
do_execsql_test colname-9.320 {
  CREATE TABLE t2 AS SELECT BBb FROM (SELECT aaa AS Bbb FROM t1);
  SELECT name FROM pragma_table_info('t2');
} {Bbb}

# Issue detected by OSSFuzz on 2017-12-24 (Christmas Eve)
# caused by check-in https://sqlite.org/src/info/6b2ff26c25
#
# Prior to being fixed, the following CREATE TABLE was dereferencing
# a NULL pointer and segfaulting.
#
do_catchsql_test colname-9.400 {
  CREATE TABLE t4 AS SELECT #0;
} {1 {near "#0": syntax error}}

# Issue detected by OSSFuzz on 2017-12-25 (Christmas Day)
# also caused by check-in https://sqlite.org/src/info/6b2ff26c25
#
# Prior to being fixed, the following CREATE TABLE caused an
# assertion fault.
#
do_catchsql_test colname-9.410 {
  CREATE TABLE t5 AS SELECT RAISE(abort,a);
} {1 {RAISE() may only be used within a trigger-program}}

# Make sure the quotation marks get removed from the column names
# when constructing a new table from an aggregate SELECT.
# Email from Juergen Palm on 2017-07-11.
#
do_execsql_test colname-10.100 {
  DROP TABLE IF EXISTS t1;

  "  --serialized        Set serialized threading mode\n"
  "  --singlethread      Set single-threaded mode - disables all mutexing\n"
  "  --sqlonly           No-op.  Only show the SQL that would have been run.\n"
  "  --shrink-memory     Invoke sqlite3_db_release_memory() frequently.\n"
  "  --size N            Relative test size.  Default=100\n"
  "  --stats             Show statistics at the end\n"
  "  --temp N            N from 0 to 9.  0: no temp table. 9: all temp tables\n"
  "  --testset T         Run test-set T (main, cte, rtree, orm, debug)\n"
  "  --trace             Turn on SQL tracing\n"
  "  --threads N         Use up to N threads for sorting\n"
  "  --utf16be           Set text encoding to UTF-16BE\n"
  "  --utf16le           Set text encoding to UTF-16LE\n"
  "  --verify            Run additional verification steps.\n"
  "  --without-rowid     Use WITHOUT ROWID where appropriate\n"
;
................................................................................
    "SELECT count(x), avg(x) FROM (\n"
    "  SELECT x FROM t1 EXCEPT SELECT y FROM t2 ORDER BY 1\n"
    ");",
    nElem, nElem
  );
  speedtest1_run();
  speedtest1_end_test();







































































}

#ifdef SQLITE_ENABLE_RTREE
/* Generate two numbers between 1 and mx.  The first number is less than
** the second.  Usually the numbers are near each other but can sometimes
** be far apart.
*/
................................................................................
    testset_main();
  }else if( strcmp(zTSet,"debug1")==0 ){
    testset_debug1();
  }else if( strcmp(zTSet,"orm")==0 ){
    testset_orm();
  }else if( strcmp(zTSet,"cte")==0 ){
    testset_cte();


  }else if( strcmp(zTSet,"rtree")==0 ){
#ifdef SQLITE_ENABLE_RTREE
    testset_rtree(6, 147);
#else
    fatal_error("compile with -DSQLITE_ENABLE_RTREE to enable "
                "the R-Tree tests\n");
#endif
  }else{
    fatal_error("unknown testset: \"%s\"\nChoices: main debug1 cte rtree\n",
                 zTSet);
  }
  speedtest1_final();

  if( showStats ){
    sqlite3_exec(g.db, "PRAGMA compile_options", xCompileOptions, 0, 0);
  }

  "  --serialized        Set serialized threading mode\n"
  "  --singlethread      Set single-threaded mode - disables all mutexing\n"
  "  --sqlonly           No-op.  Only show the SQL that would have been run.\n"
  "  --shrink-memory     Invoke sqlite3_db_release_memory() frequently.\n"
  "  --size N            Relative test size.  Default=100\n"
  "  --stats             Show statistics at the end\n"
  "  --temp N            N from 0 to 9.  0: no temp table. 9: all temp tables\n"
  "  --testset T         Run test-set T (main, cte, rtree, orm, fp, debug)\n"
  "  --trace             Turn on SQL tracing\n"
  "  --threads N         Use up to N threads for sorting\n"
  "  --utf16be           Set text encoding to UTF-16BE\n"
  "  --utf16le           Set text encoding to UTF-16LE\n"
  "  --verify            Run additional verification steps.\n"
  "  --without-rowid     Use WITHOUT ROWID where appropriate\n"
;
................................................................................
    "SELECT count(x), avg(x) FROM (\n"
    "  SELECT x FROM t1 EXCEPT SELECT y FROM t2 ORDER BY 1\n"
    ");",
    nElem, nElem
  );
  speedtest1_run();
  speedtest1_end_test();
}

/*
** Compute a pseudo-random floating point ascii number.
*/
void speedtest1_random_ascii_fp(char *zFP){
  int x = speedtest1_random();
  int y = speedtest1_random();
  int z;
  z = y%10;
  if( z<0 ) z = -z;
  y /= 10;
  sqlite3_snprintf(100,zFP,"%d.%de%d",y,z,x%200);
}

/*
** A testset for floating-point numbers.
*/
void testset_fp(void){
  int n;
  int i;
  char zFP1[100];
  char zFP2[100];
  
  n = g.szTest*5000;
  speedtest1_begin_test(100, "Fill a table with %d FP values", n*2);
  speedtest1_exec("BEGIN");
  speedtest1_exec("CREATE%s TABLE t1(a REAL %s, b REAL %s);",
                  isTemp(1), g.zNN, g.zNN);
  speedtest1_prepare("INSERT INTO t1 VALUES(?1,?2); -- %d times", n);
  for(i=1; i<=n; i++){
    speedtest1_random_ascii_fp(zFP1);
    speedtest1_random_ascii_fp(zFP2);
    sqlite3_bind_text(g.pStmt, 1, zFP1, -1, SQLITE_STATIC);
    sqlite3_bind_text(g.pStmt, 2, zFP2, -1, SQLITE_STATIC);
    speedtest1_run();
  }
  speedtest1_exec("COMMIT");
  speedtest1_end_test();

  n = g.szTest/25 + 2;
  speedtest1_begin_test(110, "%d range queries", n);
  speedtest1_prepare("SELECT sum(b) FROM t1 WHERE a BETWEEN ?1 AND ?2");
  for(i=1; i<=n; i++){
    speedtest1_random_ascii_fp(zFP1);
    speedtest1_random_ascii_fp(zFP2);
    sqlite3_bind_text(g.pStmt, 1, zFP1, -1, SQLITE_STATIC);
    sqlite3_bind_text(g.pStmt, 2, zFP2, -1, SQLITE_STATIC);
    speedtest1_run();
  }
  speedtest1_end_test();

  speedtest1_begin_test(120, "CREATE INDEX three times");
  speedtest1_exec("BEGIN;");
  speedtest1_exec("CREATE INDEX t1a ON t1(a);");
  speedtest1_exec("CREATE INDEX t1b ON t1(b);");
  speedtest1_exec("CREATE INDEX t1ab ON t1(a,b);");
  speedtest1_exec("COMMIT;");
  speedtest1_end_test();

  n = g.szTest/3 + 2;
  speedtest1_begin_test(130, "%d indexed range queries", n);
  speedtest1_prepare("SELECT sum(b) FROM t1 WHERE a BETWEEN ?1 AND ?2");
  for(i=1; i<=n; i++){
    speedtest1_random_ascii_fp(zFP1);
    speedtest1_random_ascii_fp(zFP2);
    sqlite3_bind_text(g.pStmt, 1, zFP1, -1, SQLITE_STATIC);
    sqlite3_bind_text(g.pStmt, 2, zFP2, -1, SQLITE_STATIC);
    speedtest1_run();
  }
  speedtest1_end_test();
}

#ifdef SQLITE_ENABLE_RTREE
/* Generate two numbers between 1 and mx.  The first number is less than
** the second.  Usually the numbers are near each other but can sometimes
** be far apart.
*/
................................................................................
    testset_main();
  }else if( strcmp(zTSet,"debug1")==0 ){
    testset_debug1();
  }else if( strcmp(zTSet,"orm")==0 ){
    testset_orm();
  }else if( strcmp(zTSet,"cte")==0 ){
    testset_cte();
  }else if( strcmp(zTSet,"fp")==0 ){
    testset_fp();
  }else if( strcmp(zTSet,"rtree")==0 ){
#ifdef SQLITE_ENABLE_RTREE
    testset_rtree(6, 147);
#else
    fatal_error("compile with -DSQLITE_ENABLE_RTREE to enable "
                "the R-Tree tests\n");
#endif
  }else{
    fatal_error("unknown testset: \"%s\"\nChoices: main debug1 cte rtree fp\n",
                 zTSet);
  }
  speedtest1_final();

  if( showStats ){
    sqlite3_exec(g.db, "PRAGMA compile_options", xCompileOptions, 0, 0);
  }

    --rtree)
        SPEEDTEST_OPTS="$SPEEDTEST_OPTS --testset rtree"
        CC_OPTS="$CC_OPTS -DSQLITE_ENABLE_RTREE"
        ;;
    --orm)
        SPEEDTEST_OPTS="$SPEEDTEST_OPTS --testset orm"
        ;;






    -*)
        CC_OPTS="$CC_OPTS $1"
        ;;
    *)
	BASELINE=$1
        ;;
  esac

    --rtree)
        SPEEDTEST_OPTS="$SPEEDTEST_OPTS --testset rtree"
        CC_OPTS="$CC_OPTS -DSQLITE_ENABLE_RTREE"
        ;;
    --orm)
        SPEEDTEST_OPTS="$SPEEDTEST_OPTS --testset orm"
        ;;
    --cte)
        SPEEDTEST_OPTS="$SPEEDTEST_OPTS --testset cte"
        ;;
    --fp)
        SPEEDTEST_OPTS="$SPEEDTEST_OPTS --testset fp"
        ;;
    -*)
        CC_OPTS="$CC_OPTS $1"
        ;;
    *)
	BASELINE=$1
        ;;
  esac