1 files changed, 117 insertions, 0 deletions
diff --git a/generic/tclCmdIL.c b/generic/tclCmdIL.c
index cdc302c..7776c78 100644
--- a/generic/tclCmdIL.c
+++ b/generic/tclCmdIL.c
@@ -4486,6 +4486,123 @@ Tcl_LsortObjCmd(
 /*
  *----------------------------------------------------------------------
  *
+ * Tcl_LsubstObjCmd --
+ *
+ *	This procedure is invoked to process the "lsubst" Tcl command. See the
+ *	user documentation for details on what it does.
+ *
+ * Results:
+ *	A standard Tcl result.
+ *
+ * Side effects:
+ *	See the user documentation.
+ *
+ *----------------------------------------------------------------------
+ */
+
+int
+Tcl_LsubstObjCmd(
+    TCL_UNUSED(ClientData),
+    Tcl_Interp *interp,		/* Current interpreter. */
+    int objc,			/* Number of arguments. */
+    Tcl_Obj *const objv[])	/* Argument values. */
+{
+    Tcl_Obj *listPtr;		/* Pointer to the list being altered. */
+    Tcl_Obj *finalValuePtr;	/* Value finally assigned to the variable. */
+    int createdNewObj;
+    int result;
+    int first;
+    int last;
+    int listLen;
+    int numToDelete;
+
+    if (objc < 4) {
+	Tcl_WrongNumArgs(interp, 1, objv,
+		"listVar first last ?element ...?");
+	return TCL_ERROR;
+    }
+
+    listPtr = Tcl_ObjGetVar2(interp, objv[1], NULL, TCL_LEAVE_ERR_MSG);
+    if (listPtr == NULL) {
+	return TCL_ERROR;
+    }
+
+    /*
+     * TODO - refactor the index extraction into a common function shared
+     * by Tcl_{Lrange,Lreplace,Lsubst}ObjCmd
+     */
+
+    result = TclListObjLengthM(interp, listPtr, &listLen);
+    if (result != TCL_OK) {
+	return result;
+    }
+
+    result = TclGetIntForIndexM(interp, objv[2], /*end*/ listLen-1, &first);
+    if (result != TCL_OK) {
+	return result;
+    }
+
+    result = TclGetIntForIndexM(interp, objv[3], /*end*/ listLen-1, &last);
+    if (result != TCL_OK) {
+	return result;
+    }
+
+    if (first == TCL_INDEX_NONE) {
+	first = 0;
+    } else if (first > listLen) {
+	first = listLen;
+    }
+
+    if (last >= listLen) {
+	last = listLen - 1;
+    }
+    if (first <= last) {
+	numToDelete = last - first + 1;
+    } else {
+	numToDelete = 0;
+    }
+
+    if (Tcl_IsShared(listPtr)) {
+	listPtr = TclListObjCopy(NULL, listPtr);
+	createdNewObj = 1;
+    } else {
+	createdNewObj = 0;
+    }
+
+    result =
+	Tcl_ListObjReplace(interp, listPtr, first, numToDelete, objc - 4, objv + 4);
+    if (result != TCL_OK) {
+	if (createdNewObj) {
+	    Tcl_DecrRefCount(listPtr);
+	}
+	return result;
+    }
+
+    /*
+     * Tcl_ObjSetVar2 mau return a value different from listPtr in the
+     * presence of traces etc.. Note that finalValuePtr will always have a
+     * reference count of at least 1 corresponding to the reference from the
+     * var. If it is same as listPtr, then ref count will be at least 2
+     * since we are incr'ing the latter below (safer when calling
+     * Tcl_ObjSetVar2 which can release it in some cases). Note that we
+     * leave the incrref of listPtr this late because we want to pass it as
+     * unshared to Tcl_ListObjReplace above if possible.
+     */
+    Tcl_IncrRefCount(listPtr);
+    finalValuePtr =
+	Tcl_ObjSetVar2(interp, objv[1], NULL, listPtr, TCL_LEAVE_ERR_MSG);
+    Tcl_DecrRefCount(listPtr); /* safe irrespective of createdNewObj */
+    if (finalValuePtr == NULL) {
+	return TCL_ERROR;
+    }
+
+    Tcl_SetObjResult(interp, finalValuePtr);
+    return TCL_OK;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
  * MergeLists -
  *
  *	This procedure combines two sorted lists of SortElement structures