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1 | #!./perl |
2 | |
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3 | # $RCSfile: repeat.t,v $$Revision: 4.1 $$Date: 92/08/07 18:28:21 $ |
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4 | |
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5 | print "1..20\n"; |
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6 | |
7 | # compile time |
8 | |
9 | if ('-' x 5 eq '-----') {print "ok 1\n";} else {print "not ok 1\n";} |
10 | if ('-' x 1 eq '-') {print "ok 2\n";} else {print "not ok 2\n";} |
11 | if ('-' x 0 eq '') {print "ok 3\n";} else {print "not ok 3\n";} |
12 | |
13 | if ('ab' x 3 eq 'ababab') {print "ok 4\n";} else {print "not ok 4\n";} |
14 | |
15 | # run time |
16 | |
17 | $a = '-'; |
18 | if ($a x 5 eq '-----') {print "ok 5\n";} else {print "not ok 5\n";} |
19 | if ($a x 1 eq '-') {print "ok 6\n";} else {print "not ok 6\n";} |
20 | if ($a x 0 eq '') {print "ok 7\n";} else {print "not ok 7\n";} |
21 | |
22 | $a = 'ab'; |
23 | if ($a x 3 eq 'ababab') {print "ok 8\n";} else {print "not ok 8\n";} |
24 | |
25 | $a = 'xyz'; |
26 | $a x= 2; |
27 | if ($a eq 'xyzxyz') {print "ok 9\n";} else {print "not ok 9\n";} |
28 | $a x= 1; |
29 | if ($a eq 'xyzxyz') {print "ok 10\n";} else {print "not ok 10\n";} |
30 | $a x= 0; |
31 | if ($a eq '') {print "ok 11\n";} else {print "not ok 11\n";} |
32 | |
33 | @x = (1,2,3); |
34 | |
35 | print join('', @x x 4) eq '3333' ? "ok 12\n" : "not ok 12\n"; |
36 | print join('', (@x) x 4) eq '123123123123' ? "ok 13\n" : "not ok 13\n"; |
37 | print join('', (@x,()) x 4) eq '123123123123' ? "ok 14\n" : "not ok 14\n"; |
38 | print join('', (@x,1) x 4) eq '1231123112311231' ? "ok 15\n" : "not ok 15\n"; |
39 | print join(':', () x 4) eq '' ? "ok 16\n" : "not ok 16\n"; |
40 | print join(':', (9) x 4) eq '9:9:9:9' ? "ok 17\n" : "not ok 17\n"; |
41 | print join(':', (9,9) x 4) eq '9:9:9:9:9:9:9:9' ? "ok 18\n" : "not ok 18\n"; |
42 | print join('', (split(//,"123")) x 2) eq '123123' ? "ok 19\n" : "not ok 19\n"; |
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43 | |
44 | # |
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45 | # The test #20 is actually testing for Digital C compiler optimizer bug, |
46 | # present in Dec C versions 5.* and 6.0 (used in Digital UNIX and VMS), |
47 | # found in December 1998. The bug was reported to Digital^WCompaq as |
48 | # DECC 2745 (21-Dec-1998) |
49 | # GEM_BUGS 7619 (23-Dec-1998) |
50 | # As of April 1999 the bug has been fixed in Tru64 UNIX 5.0 and is planned |
51 | # to be fixed also in 4.0G. |
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52 | # |
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53 | # The bug was as follows: broken code was produced for util.c:repeatcpy() |
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54 | # (a utility function for the 'x' operator) in the case *all* these |
55 | # four conditions held: |
56 | # |
57 | # (1) len == 1 |
58 | # (2) "from" had the 8th bit on in its single character |
59 | # (3) count > 7 (the 'x' count > 16) |
60 | # (4) the highest optimization level was used in compilation |
61 | # (which is the default when compiling Perl) |
62 | # |
63 | # The bug looked like this (. being the eight-bit character and ? being \xff): |
64 | # |
65 | # 16 ................ |
66 | # 17 .........???????. |
67 | # 18 .........???????.. |
68 | # 19 .........???????... |
69 | # 20 .........???????.... |
70 | # 21 .........???????..... |
71 | # 22 .........???????...... |
72 | # 23 .........???????....... |
73 | # 24 .........???????.??????? |
74 | # 25 .........???????.???????. |
75 | # |
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76 | # The bug was triggered in the "if (len == 1)" branch. The fix |
77 | # was to introduce a new temporary variable. In diff -u format: |
78 | # |
79 | # register char *frombase = from; |
80 | # |
81 | # if (len == 1) { |
82 | #- todo = *from; |
83 | #+ register char c = *from; |
84 | # while (count-- > 0) |
85 | #- *to++ = todo; |
86 | #+ *to++ = c; |
87 | # return; |
88 | # } |
89 | # |
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90 | # The bug could also be (obscurely) avoided by changing "from" to |
91 | # be an unsigned char pointer. |
92 | # |
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93 | # This obscure bug was not found by the then test suite but instead |
94 | # by Mark.Martinec@nsc.ijs.si while trying to install Digest-MD5-2.00. |
95 | # |
96 | # jhi@iki.fi |
97 | # |
98 | print "\xdd" x 24 eq "\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd" ? "ok 20\n" : "not ok 20\n"; |