From 017257e0ef3f20643166931986ea36eeee97f049 Mon Sep 17 00:00:00 2001
From: "jan.nijtmans" <nijtmans@users.sourceforge.net>
Date: Sat, 23 May 2020 22:07:53 +0000
Subject: Rewrite "string wordend" to use the Tcl_UniChar array.

---
 generic/tclCmdMZ.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/generic/tclCmdMZ.c b/generic/tclCmdMZ.c
index 0e624c6..88bf2ec 100644
--- a/generic/tclCmdMZ.c
+++ b/generic/tclCmdMZ.c
@@ -2709,28 +2709,26 @@ StringEndCmd(
     Tcl_Obj *const objv[])	/* Argument objects. */
 {
     int ch;
-    const char *p, *end, *string;
-    int cur, index, length, numChars;
+    const Tcl_UniChar *p, *end, *string;
+    int cur, index, length;
 
     if (objc != 3) {
 	Tcl_WrongNumArgs(interp, 1, objv, "string index");
 	return TCL_ERROR;
     }
 
-    string = TclGetStringFromObj(objv[1], &length);
-    numChars = Tcl_NumUtfChars(string, length);
-    if (TclGetIntForIndexM(interp, objv[2], numChars-1, &index) != TCL_OK) {
+    string = Tcl_GetUnicodeFromObj(objv[1], &length);
+    if (TclGetIntForIndexM(interp, objv[2], length-1, &index) != TCL_OK) {
 	return TCL_ERROR;
     }
-    string = TclGetStringFromObj(objv[1], &length);
     if (index < 0) {
 	index = 0;
     }
-    if (index < numChars) {
-	p = Tcl_UtfAtIndex(string, index);
+    if (index < length) {
+	p = &string[index];
 	end = string+length;
 	for (cur = index; p < end; cur++) {
-	    p += TclUtfToUCS4(p, &ch);
+	    p += TclUniCharToUCS4(p, &ch);
 	    if (!Tcl_UniCharIsWordChar(ch)) {
 		break;
 	    }
@@ -2739,7 +2737,7 @@ StringEndCmd(
 	    cur++;
 	}
     } else {
-	cur = numChars;
+	cur = length;
     }
     Tcl_SetObjResult(interp, Tcl_NewWideIntObj(cur));
     return TCL_OK;
-- 
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