github.com/jdgcs/sqlite3@v1.12.1-0.20210908114423-bc5f96e4dd51/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  
    23  expr srand(1)
    24  for {set i 1} {$i<20000} {incr i} {
    25    set pow [expr {int((rand()-0.5)*100)}]
    26    set x [expr {pow((rand()-0.5)*2*rand(),$pow)}]
    27    set xf [format %.32e $x]
    28  
    29    # Verify that text->real conversions get exactly same ieee754 floating-
    30    # point value in SQLite as they do in TCL.
    31    #
    32    do_test atof1-1.$i.1 {
    33      set y [db eval "SELECT $xf=\$x"]
    34      if {!$y} {
    35        puts -nonewline \173[db eval "SELECT real2hex($xf), real2hex(\$x)"]\175
    36        db eval "SELECT $xf+0.0 AS a, \$x AS b" {
    37          puts [format "\n%.60e\n%.60e\n%.60e" $x $a $b]
    38        }
    39      }
    40      set y
    41    } {1}
    42  
    43    # Verify that round-trip real->text->real conversions using the quote()
    44    # function preserve the bits of the numeric value exactly.
    45    #
    46    do_test atof1-1.$i.2 {
    47      set y [db eval {SELECT $x=CAST(quote($x) AS real)}]
    48      if {!$y} {
    49        db eval {SELECT real2hex($x) a, real2hex(CAST(quote($x) AS real)) b} {}
    50        puts "\nIN:    $a $xf"
    51        puts [format {QUOTE: %16s %s} {} [db eval {SELECT quote($x)}]]
    52        db eval {SELECT CAST(quote($x) AS real) c} {}
    53        puts "OUT:   $b [format %.32e $c]"
    54      }
    55      set y
    56    } {1}
    57  }
    58  
    59  # 2020-01-08 ticket 9eda2697f5cc1aba
    60  # When running sqlite3AtoF() on a blob with an odd number of bytes using
    61  # UTF16, ignore the last byte so that the string has an integer number of
    62  # UTF16 code points.
    63  #
    64  reset_db
    65  do_execsql_test atof1-2.10 {
    66    PRAGMA encoding = 'UTF16be';
    67    CREATE TABLE t1(a, b);
    68    INSERT INTO t1(rowid,a) VALUES (1,x'00'),(2,3);
    69    SELECT substr(a,',') is true FROM t1 ORDER BY rowid;
    70  } {0 1}
    71  do_execsql_test atof1-2.20 {
    72    SELECT substr(a,',') is true FROM t1 ORDER BY rowid DESC;
    73  } {1 0}
    74  do_execsql_test atof1-2.30 {
    75    CREATE INDEX i1 ON t1(a);
    76    SELECT count(*) FROM t1 WHERE substr(a,',');
    77  } {1}
    78  # 2020-08-27 OSSFuzz find related to the above.
    79  do_execsql_test atof1-2.40 {
    80    SELECT randomblob(0) - 1;
    81  } {-1}
    82  
    83  
    84  finish_test