hush: fix environment and memory leaks, add tests for them

function                                             old     new   delta
add_malloced_string_to_strings                         -     110    +110
run_list                                            1999    2086     +87
free_strings_and_unsetenv                              -      87     +87
hush_version_str                                       -      18     +18
pseudo_exec_argv                                     139     146      +7
static.version_str                                    17       -     -17
free_pipe                                            237     210     -27
done_word                                            790     642    -148
------------------------------------------------------------------------------
(add/remove: 3/1 grow/shrink: 2/2 up/down: 309/-192)          Total: 117 bytes

5 files changed, 127 insertions, 0 deletions

diff --git a/shell/hush_test/hush-vars/var_leaks.right b/shell/hush_test/hush-vars/var_leaks.right
new file mode 100644
index 0000000..d86bac9
--- /dev/null
+++ b/shell/hush_test/hush-vars/var_leaks.right
@@ -0,0 +1 @@
+OK
diff --git a/shell/hush_test/hush-vars/var_leaks.tests b/shell/hush_test/hush-vars/var_leaks.tests
new file mode 100755
index 0000000..27c8c65
--- /dev/null
+++ b/shell/hush_test/hush-vars/var_leaks.tests
@@ -0,0 +1,14 @@
+# external program
+a=b /bin/true
+env | grep ^a=
+
+# builtin
+a=b true
+env | grep ^a=
+
+# exec with redirection only
+# in bash, this leaks!
+a=b exec 1>&1
+env | grep ^a=
+
+echo OK
diff --git a/shell/hush_test/hush-z_slow/leak_var.tests b/shell/hush_test/hush-z_slow/leak_var.tests
index 388d6a7..b3e13e3 100755
--- a/shell/hush_test/hush-z_slow/leak_var.tests
+++ b/shell/hush_test/hush-z_slow/leak_var.tests
@@ -42,6 +42,53 @@ while test $i != X; do
 done
 end=`ps -o pid,vsz | grep "^ *$pid "`
 
+# Warm up again (I do need it on my machine)
+beg=`ps -o pid,vsz | grep "^ *$pid "`
+i=1
+while test $i != X; do
+    unset t
+    t=111111111111111111111111111111111111111111111111111111111111111111111111
+    export t
+    unset t
+    t=111111111111111111111111111111111111111111111111111111111111111111111111
+    export t
+    unset t
+    t=111111111111111111111111111111111111111111111111111111111111111111111111
+    export t
+    unset t
+    t=111111111111111111111111111111111111111111111111111111111111111111111111
+    export t
+    unset t
+    t=111111111111111111111111111111111111111111111111111111111111111111111111
+    export t
+    i=1$i
+    if test $i = 1111111111111111111111111111111111111111111111; then i=2; fi
+    if test $i = 1111111111111111111111111111111111111111111112; then i=3; fi
+    if test $i = 1111111111111111111111111111111111111111111113; then i=4; fi
+    if test $i = 1111111111111111111111111111111111111111111114; then i=5; fi
+    if test $i = 1111111111111111111111111111111111111111111115; then i=6; fi
+    if test $i = 1111111111111111111111111111111111111111111116; then i=7; fi
+    if test $i = 1111111111111111111111111111111111111111111117; then i=8; fi
+    if test $i = 1111111111111111111111111111111111111111111118; then i=9; fi
+    if test $i = 1111111111111111111111111111111111111111111119; then i=a; fi
+    if test $i = 111111111111111111111111111111111111111111111a; then i=b; fi
+    if test $i = 111111111111111111111111111111111111111111111b; then i=c; fi
+    if test $i = 111111111111111111111111111111111111111111111c; then i=d; fi
+    if test $i = 111111111111111111111111111111111111111111111d; then i=e; fi
+    if test $i = 111111111111111111111111111111111111111111111e; then i=f; fi
+    if test $i = 111111111111111111111111111111111111111111111f; then i=g; fi
+    if test $i = 111111111111111111111111111111111111111111111g; then i=h; fi
+    if test $i = 111111111111111111111111111111111111111111111h; then i=i; fi
+    if test $i = 111111111111111111111111111111111111111111111i; then i=j; fi
+    if test $i = 111111111111111111111111111111111111111111111j; then i=X; fi
+done
+end=`ps -o pid,vsz | grep "^ *$pid "`
+if test "$beg" != "$end"; then
+    true echo "vsz grows: $beg -> $end"
+else
+    true echo "vsz does not grow"
+fi
+
 echo "Measuring memory leak..."
 beg=`ps -o pid,vsz | grep "^ *$pid "`
 i=1
diff --git a/shell/hush_test/hush-z_slow/leak_var2.right b/shell/hush_test/hush-z_slow/leak_var2.right
new file mode 100644
index 0000000..7bccc1e
--- /dev/null
+++ b/shell/hush_test/hush-z_slow/leak_var2.right
@@ -0,0 +1,2 @@
+Measuring memory leak...
+vsz does not grow
diff --git a/shell/hush_test/hush-z_slow/leak_var2.tests b/shell/hush_test/hush-z_slow/leak_var2.tests
new file mode 100755
index 0000000..09f2475
--- /dev/null
+++ b/shell/hush_test/hush-z_slow/leak_var2.tests
@@ -0,0 +1,63 @@
+pid=$$
+
+t=1
+export t
+
+# Warm up
+beg=`ps -o pid,vsz | grep "^ *$pid "`
+i=1
+while test $i != X; do
+    t=111111111111111111111111111111111111111111111111111111111111111111111110$i
+    t=111111111111111111111111111111111111111111111111111111111111111111111111$i true
+    t=111111111111111111111111111111111111111111111111111111111111111111111112$i /bin/true
+    t=111111111111111111111111111111111111111111111111111111111111111111111113$i exec 1>&1
+    i=1$i
+    if test $i = 1111111111111111111111111111111111111111111111; then i=2; fi
+    if test $i = 1111111111111111111111111111111111111111111112; then i=3; fi
+    if test $i = 1111111111111111111111111111111111111111111113; then i=4; fi
+    if test $i = 1111111111111111111111111111111111111111111114; then i=X; fi
+done
+end=`ps -o pid,vsz | grep "^ *$pid "`
+
+# Warm up again (I do need it on my machine)
+beg=`ps -o pid,vsz | grep "^ *$pid "`
+i=1
+while test $i != X; do
+    t=111111111111111111111111111111111111111111111111111111111111111111111110$i
+    t=111111111111111111111111111111111111111111111111111111111111111111111111$i true
+    t=111111111111111111111111111111111111111111111111111111111111111111111112$i /bin/true
+    t=111111111111111111111111111111111111111111111111111111111111111111111113$i exec 1>&1
+    i=1$i
+    if test $i = 1111111111111111111111111111111111111111111111; then i=2; fi
+    if test $i = 1111111111111111111111111111111111111111111112; then i=3; fi
+    if test $i = 1111111111111111111111111111111111111111111113; then i=4; fi
+    if test $i = 1111111111111111111111111111111111111111111114; then i=X; fi
+done
+end=`ps -o pid,vsz | grep "^ *$pid "`
+if test "$beg" != "$end"; then
+    true echo "vsz grows: $beg -> $end"
+else
+    true echo "vsz does not grow"
+fi
+
+echo "Measuring memory leak..."
+beg=`ps -o pid,vsz | grep "^ *$pid "`
+i=1
+while test $i != X; do
+    t=111111111111111111111111111111111111111111111111111111111111111111111110$i
+    t=111111111111111111111111111111111111111111111111111111111111111111111111$i true
+    t=111111111111111111111111111111111111111111111111111111111111111111111112$i /bin/true
+    t=111111111111111111111111111111111111111111111111111111111111111111111113$i exec 1>&1
+    i=1$i
+    if test $i = 1111111111111111111111111111111111111111111111; then i=2; fi
+    if test $i = 1111111111111111111111111111111111111111111112; then i=3; fi
+    if test $i = 1111111111111111111111111111111111111111111113; then i=4; fi
+    if test $i = 1111111111111111111111111111111111111111111114; then i=X; fi
+done
+end=`ps -o pid,vsz | grep "^ *$pid "`
+
+if test "$beg" != "$end"; then
+    echo "vsz grows: $beg -> $end"
+else
+    echo "vsz does not grow"
+fi