From 1ed01a8d473a4138dbfb10769ce4fb08292b323a Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Sun, 13 Jun 2021 20:13:50 +0900
Subject: pack.c: `count` should not be negative for directives `xX@`.

---
 mrbgems/mruby-pack/src/pack.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mrbgems/mruby-pack/src/pack.c b/mrbgems/mruby-pack/src/pack.c
index fe3420f36..2724b0688 100644
--- a/mrbgems/mruby-pack/src/pack.c
+++ b/mrbgems/mruby-pack/src/pack.c
@@ -1251,7 +1251,10 @@ alias:
       tmpl->idx = e - tptr;
       continue;
     } else if (ch == '*')  {
-      count = -1;
+      if (type == PACK_TYPE_NONE)
+        count = 0;
+      else
+        count = -1;
     } else if (ch == '_' || ch == '!' || ch == '<' || ch == '>') {
       if (strchr("sSiIlLqQ", (int)t) == NULL) {
         mrb_raisef(mrb, E_ARGUMENT_ERROR, "'%c' allowed only after types sSiIlLqQ", ch);
-- 
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