hush: fix ${##}, ${#?}, ${#!} handling

function                                             old     new   delta
parse_dollar                                         786     820     +34
expand_one_var                                      1579    1592     +13
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 47/0)               Total: 47 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/shell/hush_test/hush-vars/param_expand_len1.tests b/shell/hush_test/hush-vars/param_expand_len1.tests
new file mode 100755
index 000000000..e1beab320
--- /dev/null
+++ b/shell/hush_test/hush-vars/param_expand_len1.tests
@@ -0,0 +1,31 @@
+# ${#c} for any single char c means "length of $c", including all special vars
+
+false
+echo One:${#?}
+(exit 10)
+echo Two:${#?}
+(exit 100)
+echo Three:${#?}
+
+echo
+echo One:${##}
+set -- 1 2 3 4 5 6 7 8 9 0
+echo Two:${##}
+set -- 1 2 3 4 5 6 7 8 9 0  1 2 3 4 5 6 7 8 9 0  1 2 3 4 5 6 7 8 9 0 \
+       1 2 3 4 5 6 7 8 9 0  1 2 3 4 5 6 7 8 9 0  1 2 3 4 5 6 7 8 9 0 \
+       1 2 3 4 5 6 7 8 9 0  1 2 3 4 5 6 7 8 9 0  1 2 3 4 5 6 7 8 9 0 \
+       1 2 3 4 5 6 7 8 9 0  1 2 3 4 5 6 7 8 9 0  1 2 3 4 5 6 7 8 9 0
+echo Three:${##}
+
+echo
+v=$$
+test "${#v}" = "${#$}"
+echo 'Ok ${#$}:' $?
+
+echo
+sleep 0 &
+v=$!
+test "${#v}" = "${#!}"
+echo 'Ok ${#!}:' $?
+
+# TODO: ${#-} ${#_}