busybox/shell/hush_test/hush-psubst/emptytick.tests

true;  ``; echo $?
false; ``; echo $?
true;  `""`; echo $?
false; `""`; echo $?
true;  `     `; echo $?
false; `     `; echo $?

true;  $(); echo $?
false; $(); echo $?
true;  $(""); echo $?
false; $(""); echo $?
true;  $(     ); echo $?
false; $(     ); echo $?

exec ''; echo $?
echo Not reached
hush: handle empty execs Sometimes variable expansions yield empty strings, and if they happen to be a command someone wants to run like `$foo`, then hush currently segfaults. So handle `` and $(). Signed-off-by: Mike Frysinger <vapier@gentoo.org> 2009-10-18 10:41:45 +05:30			true; ``; echo $?
			false; ``; echo $?
			true; `""`; echo $?
			false; `""`; echo $?
			true; ` `; echo $?
			false; ` `; echo $?

			`true; $(); echo $?`
			`false; $(); echo $?`
			`true; $(""); echo $?`
			`false; $(""); echo $?`
			`true; $( ); echo $?`
			`false; $( ); echo $?`

hush: fix handling of empty arguments function old new delta builtin_exec 25 83 +58 parse_stream 2242 2261 +19 run_pipe 1782 1787 +5 static.pseudo_null_str - 3 +3 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 3/0 up/down: 85/0) Total: 85 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com> 2009-10-18 15:16:35 +05:30			`exec ''; echo $?`
			`echo Not reached`