Fix use of XMaxTransChars in stead of TCL_UTF_MAX in some places. This should prevent possible buffer overflow when TCL_UTF_MAX=6

Micro-optimizations in tkEntry and ttkEntry

1 files changed, 3 insertions, 2 deletions

diff --git a/generic/ttk/ttkEntry.c b/generic/ttk/ttkEntry.c
index f395649..d80e1fd 100644
--- a/generic/ttk/ttkEntry.c
+++ b/generic/ttk/ttkEntry.c
@@ -283,14 +283,15 @@ static char *EntryDisplayString(const char *showChar, int numChars)
     char *displayString, *p;
     int size;
     Tcl_UniChar ch;
-    char buf[TCL_UTF_MAX];
+    char buf[4];
 
     Tcl_UtfToUniChar(showChar, &ch);
     size = Tcl_UniCharToUtf(ch, buf);
     p = displayString = ckalloc(numChars * size + 1);
 
     while (numChars--) {
-	p += Tcl_UniCharToUtf(ch, p);
+	memcpy(p, buf, size);
+	p += size;
     }
     *p = '\0';