tests/sort-time/rand-gen

   1 #! /p/bin/perl -w
   2 # Print n pairs of floating point values.
   3 # Each value is in the range [0,1).
   4 # Usage: rand n
   5
   6 # Use only the basename from the path to this executable in error messages.
   7 ($program_name = $0) =~ s|.*/||;
   8
   9 require 'newgetopt.pl';
  10 $MAXINT = 0x7fffffff;
  11
  12 undef $opt_help;
  13 undef $opt_verbose;
  14 undef $opt_integer;
  15 &usage if (&NGetOpt(('seed=i', 'range=s', 'help', 'items-per-line=i',
  16                      'format=s', 'integer', 'verbose')) == 0);
  17
  18 &usage if (defined ($opt_help));
  19
  20 &usage if (scalar (@ARGV) != 1 || $ARGV[0] !~ /^[0-9]+$/);
  21 $n = $ARGV[0];
  22
  23 if (!defined ($opt_seed))
  24   {
  25     $opt_seed = time;
  26     print STDERR "seed= $opt_seed\n" if (defined ($opt_verbose));
  27   }
  28
  29 srand ($opt_seed);
  30
  31 # FIXME: make sure this number is positive.
  32 $opt_items_per_line = 1 if (!defined ($opt_items_per_line));
  33
  34 if (defined ($opt_integer))
  35   {
  36     $opt_format = "%d" if (!defined ($opt_format));
  37     if (defined ($opt_range))
  38       {
  39         # FIXME: allow FP endpoints even though --integer specified?
  40         if ($opt_range =~ /^([0-9]+),([0-9]+)$/)
  41           {
  42             $lo = $1;
  43             $hi = $2;
  44           }
  45         else
  46           {
  47             print STDERR ("bad argument `$opt_range' to --range option\n");
  48             exit 2;
  49           }
  50       }
  51     else
  52       {
  53         $lo = 0;
  54         $hi = $MAXINT;
  55       }
  56
  57     # Increase by one because we'll have to truncate to get integers.
  58     $hi += 1;
  59   }
  60 else
  61   {
  62     $opt_format = "%.15g" if (!defined ($opt_format));
  63     if (defined ($opt_range))
  64       {
  65         if ($opt_range =~ /^(-?[0-9.]+),(-?[0-9.]+)$/)
  66           {
  67             $lo = $1;
  68             $hi = $2;
  69           }
  70         else
  71           {
  72             print STDERR ("bad argument `$opt_range' to --range option\n");
  73             exit 2;
  74           }
  75       }
  76     else
  77       {
  78         $lo = 0.0;
  79         $hi = 1.0;
  80       }
  81   }
  82
  83 # FIXME: warn if lo > hi.
  84
  85 $range = $hi - $lo;
  86
  87 if ($opt_items_per_line == 1)
  88   {
  89     for ($i=0; $i < $n; $i++)
  90       {
  91         printf $opt_format, $lo + rand($range);
  92         print "\n";
  93       }
  94   }
  95 else
  96   {
  97     $separator = ' ';
  98     for ($i=0; $i < $n; $i++)
  99       {
 100         for ($j=0; $j < $opt_items_per_line; $j++)
 101           {
 102             printf $opt_format, $lo + rand($range);
 103             print $j == $opt_items_per_line - 1 ? "\n" : $separator;
 104           }
 105       }
 106   }
 107
 108 exit 0;
 109
 110 sub usage
 111 {
 112   print STDERR <<EOF;
 113 Usage: $program_name [OPTIONS] n
 114     --help
 115     --seed=n
 116     --integer
 117     --items-per-line=n
 118     --range=i,j e.g. 3,9  or 1.5,33.9
 119     --format='%3d'
 120     --verbose (report the seed if it gets default value)
 121 EOF
 122   exit 2;
 123 }