Turn barewords into strings to run under strict subs.

[p5sagit/p5-mst-13.2.git] / t / op / recurse.t

diff --git a/t/op/recurse.t b/t/op/recurse.t
index dc823ed..10830e6 100755 (executable)
--- a/t/op/recurse.t
+++ b/t/op/recurse.t
@@ -4,19 +4,26 @@
 # test recursive functions.
 #
 
-print "1..25\n";
+BEGIN {
+    chdir 't' if -d 't';
+    @INC = qw(. ../lib);
+    require "test.pl";
+    plan(tests => 28);
+}
+
+use strict;
 
-sub gcd ($$) {
+sub gcd {
     return gcd($_[0] - $_[1], $_[1]) if ($_[0] > $_[1]);
     return gcd($_[0], $_[1] - $_[0]) if ($_[0] < $_[1]);
     $_[0];
 }
 
-sub factorial ($) {
+sub factorial {
     $_[0] < 2 ? 1 : $_[0] * factorial($_[0] - 1);
 }
 
-sub fibonacci ($) {
+sub fibonacci {
     $_[0] < 2 ? 1 : fibonacci($_[0] - 2) + fibonacci($_[0] - 1);
 }
 
@@ -26,7 +33,7 @@ sub fibonacci ($) {
 # For example ackermann(4,1) will take quite a long time.
 # It will simply eat away your memory. Trust me.
 
-sub ackermann ($$) {
+sub ackermann {
     return $_[1] + 1               if ($_[0] == 0);
     return ackermann($_[0] - 1, 1) if ($_[1] == 0);
     ackermann($_[0] - 1, ackermann($_[0], $_[1] - 1));
@@ -34,7 +41,7 @@ sub ackermann ($$) {
 
 # Highly recursive, highly boring.
 
-sub takeuchi ($$$) {
+sub takeuchi {
     $_[1] < $_[0] ?
        takeuchi(takeuchi($_[0] - 1, $_[1], $_[2]),
                 takeuchi($_[1] - 1, $_[2], $_[0]),
@@ -42,48 +49,30 @@ sub takeuchi ($$$) {
            : $_[2];
 }
 
-print 'not ' unless (($d = gcd(1147, 1271)) == 31);
-print "ok 1\n";
-print "# gcd(1147, 1271) = $d\n";
-
-print 'not ' unless (($d = gcd(1908, 2016)) == 36);
-print "ok 2\n";
-print "# gcd(1908, 2016) = $d\n";
+is(gcd(1147, 1271), 31, "gcd(1147, 1271) == 31");
 
-print 'not ' unless (($f = factorial(10)) == 3628800);
-print "ok 3\n";
-print "# factorial(10) = $f\n";
+is(gcd(1908, 2016), 36, "gcd(1908, 2016) == 36");
 
-print 'not ' unless (($f = factorial(factorial(3))) == 720);
-print "ok 4\n";
-print "# factorial(factorial(3)) = $f\n";
+is(factorial(10), 3628800, "factorial(10) == 3628800");
 
-print 'not ' unless (($f = fibonacci(10)) == 89);
-print "ok 5\n";
-print "# fibonacci(10) = $f\n";
+is(factorial(factorial(3)), 720, "factorial(factorial(3)) == 720");
 
-print 'not ' unless (($f = fibonacci(fibonacci(7))) == 17711);
-print "ok 6\n";
-print "# fibonacci(fibonacci(7)) = $f\n";
+is(fibonacci(10), 89, "fibonacci(10) == 89");
 
-$i = 7;
+is(fibonacci(fibonacci(7)), 17711, "fibonacci(fibonacci(7)) == 17711");
 
-@ack = qw(1 2 3 4 2 3 4 5 3 5 7 9 5 13 29 61);
+my @ack = qw(1 2 3 4 2 3 4 5 3 5 7 9 5 13 29 61);
 
-for $x (0..3) { 
-    for $y (0..3) {
-       $a = ackermann($x, $y);
-       print 'not ' unless ($a == shift(@ack));
-       print "ok ", $i++, "\n";
-       print "# ackermann($x, $y) = $a\n";
+for my $x (0..3) { 
+    for my $y (0..3) {
+       my $a = ackermann($x, $y);
+       is($a, shift(@ack), "ackermann($x, $y) == $a");
     }
 }
 
-($x, $y, $z) = (18, 12, 6);
+my ($x, $y, $z) = (18, 12, 6);
 
-print 'not ' unless (($t = takeuchi($x, $y, $z)) == $z + 1);
-print "ok ", $i++, "\n";
-print "# takeuchi($x, $y, $z) = $t\n";
+is(takeuchi($x, $y, $z), $z + 1, "takeuchi($x, $y, $z) == $z + 1");
 
 {
     sub get_first1 {
@@ -91,12 +80,12 @@ print "# takeuchi($x, $y, $z) = $t\n";
     }
 
     sub get_list1 {
-       return [24] unless $_[0];
+       return [curr_test] unless $_[0];
        my $u = get_first1(0);
        [$u];
     }
     my $x = get_first1(1);
-    print "ok $x\n";
+    ok($x, "premature FREETMPS (change 5699)");
 }
 
 {
@@ -105,12 +94,44 @@ print "# takeuchi($x, $y, $z) = $t\n";
     }
 
     sub get_list2 {
-       return [25] unless $_[0];
+       return [curr_test] unless $_[0];
        my $u = get_first2(0);
        return [$u];
     }
     my $x = get_first2(1);
-    print "ok $x\n";
+    ok($x, "premature FREETMPS (change 5699)");
+}
+
+{
+    local $^W = 0; # We do not need recursion depth warning.
+
+    sub sillysum {
+       return $_[0] + ($_[0] > 0 ? sillysum($_[0] - 1) : 0);
+    }
+
+    is(sillysum(1000), 1000*1001/2, "recursive sum of 1..1000");
+}
+
+# check ok for recursion depth > 65536
+{
+    my $r;
+    eval { 
+       $r = runperl(
+                    nolib => 1,
+                    stderr => 1,
+                    prog => q{$d=0; $e=1; sub c { ++$d; if ($d > 66000) { $e=0 } else { c(); c() unless $d % 32768 } --$d } c(); exit $e});
+    };
+  SKIP: {
+      skip("Out of memory -- increase your data/heap?", 2)
+         if $r =~ /Out of memory/i;
+      is($r, '', "64K deep recursion - no output expected");
+
+      if ($^O eq 'MacOS') {
+          ok(1, "$^O: \$? is unreliable");
+      } else {
+          is($?, 0, "64K deep recursion - no coredump expected");
+      }
+
+  }
 }
 
-$i = 26;