12 open(FOO,'op/read.t') || open(FOO,'t/op/read.t') || open(FOO,':op:read.t') || die "Can't open op.read";
13 seek(FOO,4,0) or die "Seek failed: $!";
15 my $got = read(FOO,$buf,4);
20 seek (FOO,0,2) || seek(FOO,20000,0);
21 $got = read(FOO,$buf,4);
26 # This is true if Config is not built, or if PerlIO is enabled
27 # ie assume that PerlIO is present, unless we know for sure otherwise.
28 my $has_perlio = !eval {
31 !$Config::Config{useperlio}
34 my $tmpfile = tempfile();
36 my (@values, @buffers) = ('', '');
38 foreach (65, 161, 253, 9786) {
39 push @values, join "", map {chr $_} $_ .. $_ + 4;
40 push @buffers, join "", map {chr $_} $_ + 5 .. $_ + 20;
42 my @offsets = (0, 3, 7, 22, -1, -3, -5, -7);
43 my @lengths = (0, 2, 5, 10);
45 foreach my $value (@values) {
46 foreach my $initial_buffer (@buffers) {
48 if ($value !~ tr/\0-\377//c) {
53 foreach my $utf8 (@utf8) {
54 skip "Needs :utf8 layer but no perlio", 2 * @offsets * @lengths
55 if $utf8 and !$has_perlio;
57 open FH, ">$tmpfile" or die "Can't open $tmpfile: $!";
58 binmode FH, "utf8" if $utf8;
61 foreach my $offset (@offsets) {
62 foreach my $length (@lengths) {
63 # Will read the lesser of the length of the file and the
65 my $will_read = $value;
66 if ($length < length $will_read) {
67 substr ($will_read, $length) = '';
69 # Going to trash this so need a copy
70 my $buffer = $initial_buffer;
74 # Right pad with NUL bytes
75 $expect .= "\0" x $offset;
76 substr ($expect, $offset) = '';
78 substr ($expect, $offset) = $will_read;
80 open FH, $tmpfile or die "Can't open $tmpfile: $!";
81 binmode FH, "utf8" if $utf8;
82 my $what = sprintf "%d into %d l $length o $offset",
83 ord $value, ord $buffer;
84 $what .= ' u' if $utf8;
85 $got = read (FH, $buffer, $length, $offset);
86 is ($got, length $will_read, "got $what");
87 is ($buffer, $expect, "buffer $what");