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-rw-r--r--generic/tclCmdMZ.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/generic/tclCmdMZ.c b/generic/tclCmdMZ.c
index a289a5c..38689fd 100644
--- a/generic/tclCmdMZ.c
+++ b/generic/tclCmdMZ.c
@@ -1444,11 +1444,11 @@ StringIndexCmd(
Tcl_SetObjResult(interp, Tcl_NewByteArrayObj(&uch, 1));
} else {
- char buf[4];
+ char buf[TCL_UTF_MAX] = "";
length = Tcl_UniCharToUtf(ch, buf);
if ((ch >= 0xD800) && (length < 3)) {
- length = Tcl_UniCharToUtf(-1, buf + length);
+ length += Tcl_UniCharToUtf(-1, buf + length);
}
Tcl_SetObjResult(interp, Tcl_NewStringObj(buf, length));
}