tests/misc/head-elide-tail

   1 #!/bin/sh
   2 # -*- perl -*-
   3 # Exercise head's --bytes=-N option.
   4
   5 : ${PERL=perl}
   6 : ${srcdir=.}
   7
   8 $PERL -e 1 > /dev/null 2>&1 || {
   9   echo 1>&2 "$0: configure didn't find a usable version of Perl," \
  10     "so can't run this test"
  11   exit 77
  12 }
  13
  14 exec $PERL -w -I$srcdir/.. -MCoreutils -- - <<\EOF
  15 #/
  16 require 5.003;
  17 use strict;
  18
  19 (my $program_name = $0) =~ s|.*/||;
  20
  21 $ENV{PROG} = 'head';
  22
  23 # Turn off localization of executable's ouput.
  24 @ENV{qw(LANGUAGE LANG LC_ALL)} = ('C') x 3;
  25
  26 # This should match the definition in head.c.
  27 my $READ_BUFSIZE = 4096;
  28
  29 my @Tests =
  30   (
  31    # Elide the exact size of the file.
  32    ['elide-b1', "--bytes=-2", {IN=>"a\n"}, {OUT=>''}],
  33    # Elide more than the size of the file.
  34    ['elide-b2', "--bytes=-2", {IN=>"a"},   {OUT=>''}],
  35    # Leave just one byte.
  36    ['elide-b3', "--bytes=-2", {IN=>"abc"}, {OUT=>'a'}],
  37    # Make it so the elided bytes straddle the end of the first
  38    # $READ_BUFSIZE block.
  39    ['elide-b4', "--bytes=-2",
  40     {IN=> 'a' x ($READ_BUFSIZE-3) . "\nbcd"},
  41     {OUT=>'a' x ($READ_BUFSIZE-3) . "\nb"}],
  42    # Make it so the elided bytes straddle the end of the 2nd
  43    # $READ_BUFSIZE block.
  44    ['elide-b5', "--bytes=-2",
  45     {IN=> 'a' x (2 * $READ_BUFSIZE - 2) . 'bcd'},
  46     {OUT=>'a' x (2 * $READ_BUFSIZE - 2) . 'b'}],
  47
  48    ['elide-l0', "--lines=-1", {IN=>''}, {OUT=>''}],
  49    ['elide-l1', "--lines=-1", {IN=>"a\n"}, {OUT=>''}],
  50    ['elide-l2', "--lines=-1", {IN=>"a"}, {OUT=>''}],
  51    ['elide-l3', "--lines=-1", {IN=>"a\nb"}, {OUT=>"a\n"}],
  52    ['elide-l4', "--lines=-1", {IN=>"a\nb\n"}, {OUT=>"a\n"}],
  53   );
  54
  55 if ($ENV{RUN_EXPENSIVE_TESTS})
  56   {
  57     # Brute force: use all combinations of file sizes [0..20] and
  58     # number of bytes to elide [0..20].  For better coverage, recompile
  59     # head with -DHEAD_TAIL_PIPE_READ_BUFSIZE=4 and
  60     # -DHEAD_TAIL_PIPE_BYTECOUNT_THRESHOLD=8
  61     my $s = "abcdefghijklmnopqrst";
  62     for my $file_size (0..20)
  63       {
  64         for my $n_elide (0..20)
  65           {
  66             my $input = substr $s, 0, $file_size;
  67             my $out_len = $n_elide < $file_size ? $file_size - $n_elide : 0;
  68             my $output = substr $input, 0, $out_len;
  69             my $t = ["elideb$file_size-$n_elide", "--bytes=-$n_elide",
  70                      {IN=>$input}, {OUT=>$output}];
  71             push @Tests, $t;
  72             my @u = @$t;
  73             # Insert the --presume-input-pipe option.
  74             $u[0] .= 'p';
  75             $u[1] .= ' --presume-input-pipe';
  76             push @Tests, \@u;
  77           }
  78       }
  79
  80     $s =~ s/(.)/$1\n/g;
  81     for my $file_size (0..20)
  82       {
  83         for my $n_elide (0..20)
  84           {
  85             my $input = substr $s, 0, 2 * $file_size;
  86             my $out_len = $n_elide < $file_size ? $file_size - $n_elide : 0;
  87             my $output = substr $input, 0, 2 * $out_len;
  88             my $t = ["elidel$file_size-$n_elide", "--lines=-$n_elide",
  89                      {IN=>$input}, {OUT=>$output}];
  90             push @Tests, $t;
  91             my @u = @$t;
  92             # Insert the --presume-input-pipe option.
  93             $u[0] .= 'p';
  94             $u[1] .= ' --presume-input-pipe';
  95             push @Tests, \@u;
  96           }
  97       }
  98   }
  99
 100 my $save_temps = $ENV{DEBUG};
 101 my $verbose = $ENV{VERBOSE};
 102
 103 my $prog = $ENV{PROG} || die "$0: \$PROG not specified in environment\n";
 104 my $fail = run_tests ($program_name, $prog, \@Tests, $save_temps, $verbose);
 105 exit $fail;
 106 EOF