xref: /openbsd/gnu/usr.bin/perl/t/op/readline.t (revision cecf84d4) 
1#!./perl
2
3BEGIN {
4    chdir 't';
5    @INC = '../lib';
6    require './test.pl';
7}
8
9plan tests => 30;
10
11# [perl #19566]: sv_gets writes directly to its argument via
12# TARG. Test that we respect SvREADONLY.
13use constant roref => \2;
14eval { for (roref) { $_ = <FH> } };
15like($@, 'Modification of a read-only value attempted', '[perl #19566]');
16
17# [perl #21628]
18{
19  my $file = tempfile();
20  open A,'+>',$file; $a = 3;
21  is($a .= <A>, 3, '#21628 - $a .= <A> , A eof');
22  close A; $a = 4;
23  is($a .= <A>, 4, '#21628 - $a .= <A> , A closed');
24}
25
26# [perl #21614]: 82 is chosen to exceed the length for sv_grow in
27# do_readline (80)
28foreach my $k (1, 82) {
29  my $result
30    = runperl (stdin => '', stderr => 1,
31              prog => "\$x = q(k) x $k; \$a{\$x} = qw(v); \$_ = <> foreach keys %a; print qw(end)",
32	      );
33  $result =~ s/\n\z// if $^O eq 'VMS';
34  is ($result, "end", '[perl #21614] for length ' . length('k' x $k));
35}
36
37
38foreach my $k (1, 21) {
39  my $result
40    = runperl (stdin => ' rules', stderr => 1,
41              prog => "\$x = q(perl) x $k; \$a{\$x} = q(v); foreach (keys %a) {\$_ .= <>; print}",
42	      );
43  $result =~ s/\n\z// if $^O eq 'VMS';
44  is ($result, ('perl' x $k) . " rules", 'rcatline to shared sv for length ' . length('perl' x $k));
45}
46
47foreach my $l (1, 82) {
48  my $k = $l;
49  $k = 'k' x $k;
50  my $copy = $k;
51  $k = <DATA>;
52  is ($k, "moo\n", 'catline to COW sv for length ' . length $copy);
53}
54
55
56foreach my $l (1, 21) {
57  my $k = $l;
58  $k = 'perl' x $k;
59  my $perl = $k;
60  $k .= <DATA>;
61  is ($k, "$perl rules\n", 'rcatline to COW sv for length ' . length $perl);
62}
63
64use strict;
65
66open F, '.' and sysread F, $_, 1;
67my $err = $! + 0;
68close F;
69
70SKIP: {
71  skip "you can read directories as plain files", 2 unless( $err );
72
73  $!=0;
74  open F, '.' and $_=<F>;
75  ok( $!==$err && !defined($_) => 'readline( DIRECTORY )' );
76  close F;
77
78  $!=0;
79  { local $/;
80    open F, '.' and $_=<F>;
81    ok( $!==$err && !defined($_) => 'readline( DIRECTORY ) slurp mode' );
82    close F;
83  }
84}
85
86fresh_perl_is('BEGIN{<>}', '',
87              { switches => ['-w'], stdin => '', stderr => 1 },
88              'No ARGVOUT used only once warning');
89
90fresh_perl_is('print readline', 'foo',
91              { switches => ['-w'], stdin => 'foo', stderr => 1 },
92              'readline() defaults to *ARGV');
93
94# [perl #72720] Test that sv_gets clears any variables that should be
95# empty so if the read() aborts with EINTER, the TARG is actually
96# cleared.
97sub test_eintr_readline {
98    my ( $fh, $timeout ) = @_;
99
100    # This variable, the TARG for the readline is the core of this
101    # test. The test is to see that after a my() and a failure in
102    # readline() has the variable revived old, "dead" values from the
103    # past or is it still undef like expected.
104    my $line;
105
106    # Do a readline into $line.
107    if ( $timeout ) {
108
109	# Do a SIGALARM aborted readline(). The underlying sv_gets()
110	# from sv.c will use the syscall read() while will exit early
111	# and return something like EINTR or ERESTARTSYS.
112	my $timed_out;
113	my $errno;
114	eval {
115	    local $SIG{ALRM} = sub {
116		$timed_out = 1;
117		die 'abort this timeout';
118	    };
119	    alarm $timeout;
120	    undef $!;
121	    $line = readline $fh;
122	    $errno = $!;
123	    alarm 0;
124	};
125
126	# The code should have timed out.
127	if ( ! $timed_out ) {
128	    warn $@
129                ? "$@: $errno\n"
130                : "Interrupted readline() test couldn't get interrupted: $errno";
131	}
132    }
133    else {
134	$line = readline $fh;
135    }
136    return $line;
137}
138SKIP: {
139
140    # Connect two handles together.
141    my ( $in, $out );
142    my $piped;
143    eval {
144	pipe $in, $out;
145	$piped = 1;
146    };
147    if ( ! $piped ) {
148	skip( 2, 'The pipe function is unimplemented' );
149    }
150
151    # Make the pipe autoflushing
152    {
153	my $old_fh = select $out;
154	$| = 1;
155	select $old_fh;
156    }
157
158    # Only one line is loaded into the pipe. It's written unbuffered
159    # so I'm confident it'll not be buffered.
160    syswrite $out, "once\n";
161
162    # Buggy perls will return the last thing successfully
163    # returned. Buggy perls will return "once\n" a second (and
164    # "infinitely" if we desired) as long as the internal read()
165    # syscall fails. In our case, it fails because the inner my($line)
166    # retains all its allocated space and buggy perl sets SvPOK to
167    # make the value valid but before it starts read().
168    my $once  = test_eintr_readline( $in, 0 );
169    is(   $once,  "once\n", "readline read first line ok" );
170
171    my $twice;
172    TODO: {
173        todo_skip( 'alarm() on Windows does not interrupt system calls' ) if $^O eq 'MSWin32';
174        todo_skip( 'readline not interrupted by alarm on VMS -- why?' ) if $^O eq 'VMS';
175        $twice = test_eintr_readline( $in, 1 );
176        isnt( $twice, "once\n", "readline didn't re-return things when interrupted" );
177    }
178
179    TODO: {
180        todo_skip( 'alarm() on Windows does not interrupt system calls' ) if $^O eq 'MSWin32';
181        todo_skip( 'readline not interrupted by alarm on VMS -- why?' ) if $^O eq 'VMS';
182        local our $TODO = "bad readline returns '', not undef";
183        is( $twice, undef, "readline returned undef when interrupted" );
184    }
185}
186
187{
188    my $line = 'ascii';
189    my ( $in, $out );
190    pipe $in, $out;
191    binmode $in;
192    binmode $out;
193    syswrite $out, "...\n";
194    $line .= readline $in;
195
196    is( $line, "ascii...\n", 'Appending from ascii to ascii' );
197}
198
199{
200    my $line = "\x{2080} utf8";
201    my ( $in, $out );
202    pipe $in, $out;
203    binmode $out;
204    binmode $in;
205    syswrite $out, "...\n";
206    $line .= readline $in;
207
208    is( $line, "\x{2080} utf8...\n", 'Appending from ascii to utf8' );
209}
210
211{
212    my $line = 'ascii';
213    my ( $in, $out );
214    pipe $in, $out;
215    binmode $out, ':utf8';
216    binmode $in,  ':utf8';
217    syswrite $out, "...\n";
218    $line .= readline $in;
219
220    is( $line, "ascii...\n", 'Appending from utf8 to ascii' );
221}
222
223{
224    my $line = "\x{2080} utf8";;
225    my ( $in, $out );
226    pipe $in, $out;
227    binmode $out, ':utf8';
228    binmode $in,  ':utf8';
229    syswrite $out, "\x{2080}...\n";
230    $line .= readline $in;
231
232    is( $line, "\x{2080} utf8\x{2080}...\n", 'appending from utf to utf8' );
233}
234
235my $obj = bless [];
236$obj .= <DATA>;
237like($obj, qr/main=ARRAY.*world/, 'rcatline and refs');
238
239# bug #38631
240require Tie::Scalar;
241tie our $one, 'Tie::StdScalar', "A: ";
242tie our $two, 'Tie::StdScalar', "B: ";
243my $junk = $one;
244$one .= <DATA>;
245$two .= <DATA>;
246is( $one, "A: One\n", "rcatline works with tied scalars" );
247is( $two, "B: Two\n", "rcatline works with tied scalars" );
248
249# mentioned in bug #97482
250# <$foo> versus readline($foo) should not affect vivification.
251my $yunk = "brumbo";
252if (exists $::{$yunk}) {
253     die "Name $yunk already used. Please adjust this test."
254}
255<$yunk>;
256ok !defined *$yunk, '<> does not autovivify';
257readline($yunk);
258ok !defined *$yunk, "readline does not autovivify";
259
260# [perl #97988] PL_last_in_gv could end up pointing to junk.
261#               Now glob copies set PL_last_in_gv to null when unglobbed.
262open *foom,'test.pl';
263my %f;
264$f{g} = *foom;
265readline $f{g};
266$f{g} = 3; # PL_last_in_gv should be cleared now
267is tell, -1, 'tell returns -1 after last gv is unglobbed';
268$f{g} = *foom; # since PL_last_in_gv is null, this should have no effect
269is tell, -1, 'unglobbery of last gv nullifies PL_last_in_gv';
270readline *{$f{g}};
271is tell, tell *foom, 'readline *$glob_copy sets PL_last_in_gv';
272
273__DATA__
274moo
275moo
276 rules
277 rules
278world
279One
280Two
281