23562: add KSH_ZERO_SUBSCRIPT option and leave off by default

1 files changed, 7 insertions, 1 deletions

diff --git a/Src/zsh.h b/Src/zsh.h
index f7255c6e7..4f11b19ad 100644
--- a/Src/zsh.h
+++ b/Src/zsh.h
@@ -585,12 +585,17 @@ struct asgment {
 struct value {
     int isarr;
     Param pm;		/* parameter node                      */
-    int inv;		/* should we return the index ?        */
+    int flags;		/* flags defined below                 */
     int start;		/* first element of array slice, or -1 */
     int end;		/* 1-rel last element of array slice, or -1 */
     char **arr;		/* cache for hash turned into array */
 };
 
+enum {
+    VALFLAG_INV =	0x0001,	/* We are performing inverse subscripting */
+    VALFLAG_EMPTY =	0x0002	/* Subscripted range is empty */
+};
+
 #define MAX_ARRLEN    262144
 
 /********************************************/
@@ -1725,6 +1730,7 @@ enum {
     KSHGLOB,
     KSHOPTIONPRINT,
     KSHTYPESET,
+    KSHZEROSUBSCRIPT,
     LISTAMBIGUOUS,
     LISTBEEP,
     LISTPACKED,