[PATCH] string_transform: keep \001\001 in ${v@E}

[Grisha Levit]

$ v=$'\1\1'; printf '%q\n' "${v@E}"
$'\001'

call ansicstr directly instead of through ansiexpand so we don't end up
trimming existing CTLESC CTLESC in the string with dequote_escapes
---
 subst.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/subst.c b/subst.c
index 855ff745..4b289021 100644
--- a/subst.c
+++ b/subst.c
@@ -8603,7 +8603,7 @@ pos_params_assignment (WORD_LIST *list, int
itype, int quoted)
 static char *
 string_transform (int xc, SHELL_VAR *v, char *s)
 {
-  char *ret, flags[MAX_ATTRIBUTES], *t;
+  char *ret, flags[MAX_ATTRIBUTES];
   int i;

   if (((xc == 'A' || xc == 'a') && v == 0))
@@ -8627,9 +8627,7 @@ string_transform (int xc, SHELL_VAR *v, char *s)
  break;
       /* Transformations that modify the variable's value */
       case 'E':
- t = ansiexpand (s, 0, strlen (s), 0);
- ret = dequote_escapes (t);
- free (t);
+ ret = ansicstr (s, strlen (s), 0, 0, 0);
  break;
       case 'P':
  ret = decode_prompt_string (s);
-- 
2.42.0