1#!./perl 2 3BEGIN { 4 chdir 't' if -d 't'; 5 @INC = '../lib'; 6} 7 8require './test.pl'; 9plan(tests => 25); 10 11# compile time 12 13is('-' x 5, '-----', 'compile time x'); 14is('-' x 1, '-', ' x 1'); 15is('-' x 0, '', ' x 0'); 16 17is('ab' x 3, 'ababab', ' more than one char'); 18 19# run time 20 21$a = '-'; 22is($a x 5, '-----', 'run time x'); 23is($a x 1, '-', ' x 1'); 24is($a x 0, '', ' x 0'); 25 26$a = 'ab'; 27is($a x 3, 'ababab', ' more than one char'); 28 29$a = 'xyz'; 30$a x= 2; 31is($a, 'xyzxyz', 'x=2'); 32$a x= 1; 33is($a, 'xyzxyz', 'x=1'); 34$a x= 0; 35is($a, '', 'x=0'); 36 37@x = (1,2,3); 38 39is(join('', @x x 4), '3333', '@x x Y'); 40is(join('', (@x) x 4), '123123123123', '(@x) x Y'); 41is(join('', (@x,()) x 4), '123123123123', '(@x,()) x Y'); 42is(join('', (@x,1) x 4), '1231123112311231', '(@x,1) x Y'); 43is(join(':', () x 4), '', '() x Y'); 44is(join(':', (9) x 4), '9:9:9:9', '(X) x Y'); 45is(join(':', (9,9) x 4), '9:9:9:9:9:9:9:9', '(X,X) x Y'); 46is(join('', (split(//,"123")) x 2), '123123', 'split and x'); 47 48 49# This test is actually testing for Digital C compiler optimizer bug, 50# present in Dec C versions 5.* and 6.0 (used in Digital UNIX and VMS), 51# found in December 1998. The bug was reported to Digital^WCompaq as 52# DECC 2745 (21-Dec-1998) 53# GEM_BUGS 7619 (23-Dec-1998) 54# As of April 1999 the bug has been fixed in Tru64 UNIX 5.0 and is planned 55# to be fixed also in 4.0G. 56# 57# The bug was as follows: broken code was produced for util.c:repeatcpy() 58# (a utility function for the 'x' operator) in the case *all* these 59# four conditions held: 60# 61# (1) len == 1 62# (2) "from" had the 8th bit on in its single character 63# (3) count > 7 (the 'x' count > 16) 64# (4) the highest optimization level was used in compilation 65# (which is the default when compiling Perl) 66# 67# The bug looked like this (. being the eight-bit character and ? being \xff): 68# 69# 16 ................ 70# 17 .........???????. 71# 18 .........???????.. 72# 19 .........???????... 73# 20 .........???????.... 74# 21 .........???????..... 75# 22 .........???????...... 76# 23 .........???????....... 77# 24 .........???????.??????? 78# 25 .........???????.???????. 79# 80# The bug was triggered in the "if (len == 1)" branch. The fix 81# was to introduce a new temporary variable. In diff -u format: 82# 83# register char *frombase = from; 84# 85# if (len == 1) { 86#- todo = *from; 87#+ register char c = *from; 88# while (count-- > 0) 89#- *to++ = todo; 90#+ *to++ = c; 91# return; 92# } 93# 94# The bug could also be (obscurely) avoided by changing "from" to 95# be an unsigned char pointer. 96# 97# This obscure bug was not found by the then test suite but instead 98# by Mark.Martinec@nsc.ijs.si while trying to install Digest-MD5-2.00. 99# 100# jhi@iki.fi 101# 102is("\xdd" x 24, "\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd", 'Dec C bug'); 103 104 105# When we use a list repeat in a scalar context, it behaves like 106# a scalar repeat. Make sure that works properly, and doesn't leave 107# extraneous values on the stack. 108# -- robin@kitsite.com 109 110my ($x, $y) = scalar ((1,2)x2); 111is($x, "22", 'list repeat in scalar context'); 112is($y, undef, ' no extra values on stack'); 113 114# Make sure the stack doesn't get truncated too much - the left 115# operand of the eq binop needs to remain! 116is(77, scalar ((1,7)x2), 'stack truncation'); 117 118 119# perlbug 20011113.110 works in 5.6.1, broken in 5.7.2 120{ 121 my $x= [("foo") x 2]; 122 is( join('', @$x), 'foofoo', 'list repeat in anon array ref broken [ID 20011113.110]' ); 123} 124 125# [ID 20010809.028] x operator not copying elements in 'for' list? 126{ 127 local $TODO = "x operator not copying elements in 'for' list? [ID 20010809.028]"; 128 my $x = 'abcd'; 129 my $y = ''; 130 for (($x =~ /./g) x 2) { 131 $y .= chop; 132 } 133 is($y, 'abcdabcd'); 134} 135 136