gitlab.com/CoiaPrant/sqlite3@v1.19.1/testdata/tcl/atof1.test (about)

     1  # 2012 June 18
     2  #
     3  # The author disclaims copyright to this source code.  In place of
     4  # a legal notice, here is a blessing:
     5  #
     6  #    May you do good and not evil.
     7  #    May you find forgiveness for yourself and forgive others.
     8  #    May you share freely, never taking more than you give.
     9  #
    10  #***********************************************************************
    11  # 
    12  # Tests of the sqlite3AtoF() function.
    13  #
    14  
    15  set testdir [file dirname $argv0]
    16  source $testdir/tester.tcl
    17  
    18  if {$::longdouble_size<=8} {
    19    finish_test
    20    return
    21  }
    22  if {$::tcl_platform(machine)!="x86_64"} {
    23    finish_test
    24    return
    25  }
    26  
    27  expr srand(1)
    28  for {set i 1} {$i<20000} {incr i} {
    29    set pow [expr {int((rand()-0.5)*100)}]
    30    set x [expr {pow((rand()-0.5)*2*rand(),$pow)}]
    31    set xf [format %.32e $x]
    32  
    33    # Verify that text->real conversions get exactly same ieee754 floating-
    34    # point value in SQLite as they do in TCL.
    35    #
    36    do_test atof1-1.$i.1 {
    37      set y [db eval "SELECT $xf=\$x"]
    38      if {!$y} {
    39        puts -nonewline \173[db eval "SELECT real2hex($xf), real2hex(\$x)"]\175
    40        db eval "SELECT $xf+0.0 AS a, \$x AS b" {
    41          puts [format "\n%.60e\n%.60e\n%.60e" $x $a $b]
    42        }
    43      }
    44      set y
    45    } {1}
    46  
    47    # Verify that round-trip real->text->real conversions using the quote()
    48    # function preserve the bits of the numeric value exactly.
    49    #
    50    do_test atof1-1.$i.2 {
    51      set y [db eval {SELECT $x=CAST(quote($x) AS real)}]
    52      if {!$y} {
    53        db eval {SELECT real2hex($x) a, real2hex(CAST(quote($x) AS real)) b} {}
    54        puts "\nIN:    $a $xf"
    55        puts [format {QUOTE: %16s %s} {} [db eval {SELECT quote($x)}]]
    56        db eval {SELECT CAST(quote($x) AS real) c} {}
    57        puts "OUT:   $b [format %.32e $c]"
    58      }
    59      set y
    60    } {1}
    61  }
    62  
    63  # 2020-01-08 ticket 9eda2697f5cc1aba
    64  # When running sqlite3AtoF() on a blob with an odd number of bytes using
    65  # UTF16, ignore the last byte so that the string has an integer number of
    66  # UTF16 code points.
    67  #
    68  reset_db
    69  do_execsql_test atof1-2.10 {
    70    PRAGMA encoding = 'UTF16be';
    71    CREATE TABLE t1(a, b);
    72    INSERT INTO t1(rowid,a) VALUES (1,x'00'),(2,3);
    73    SELECT substr(a,',') is true FROM t1 ORDER BY rowid;
    74  } {0 1}
    75  do_execsql_test atof1-2.20 {
    76    SELECT substr(a,',') is true FROM t1 ORDER BY rowid DESC;
    77  } {1 0}
    78  do_execsql_test atof1-2.30 {
    79    CREATE INDEX i1 ON t1(a);
    80    SELECT count(*) FROM t1 WHERE substr(a,',');
    81  } {1}
    82  # 2020-08-27 OSSFuzz find related to the above.
    83  do_execsql_test atof1-2.40 {
    84    SELECT randomblob(0) - 1;
    85  } {-1}
    86  
    87  
    88  finish_test