hush: fix quoted "${notexist-}" expansion to not disappear

function                                             old     new   delta
expand_one_var                                      2296    2311     +15

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

1 files changed, 6 insertions, 0 deletions

diff --git a/shell/hush.c b/shell/hush.c
index b612c80da..a103e8169 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -6132,6 +6132,12 @@ static int encode_then_append_var_plusminus(o_string *output, int n,
                 /* string has no special chars
                  * && string has no $IFS chars
                  */
+                if (dquoted) {
+                        /* Prints 1 (quoted expansion is a "" word, not nothing):
+                         * set -- "${notexist-}"; echo $#
+                         */
+                        output->has_quoted_part = 1;
+                }
                 return expand_vars_to_list(output, n, str);
         }