2 files changed, 19 insertions, 18 deletions

diff --git a/src/corelib/tools/qlist.cpp b/src/corelib/tools/qlist.cpp
index 39c1beb..249b8d1 100644
--- a/src/corelib/tools/qlist.cpp
+++ b/src/corelib/tools/qlist.cpp
@@ -180,22 +180,30 @@ void QListData::realloc(int alloc)
         d->begin = d->end = 0;
 }
 
-// ensures that enough space is available to append one element
-void **QListData::append()
+// ensures that enough space is available to append n elements
+void **QListData::append(int n)
 {
     Q_ASSERT(d->ref == 1);
-    if (d->end == d->alloc) {
-        int n = d->end - d->begin;
-        if (d->begin > 2 * d->alloc / 3) {
+    int e = d->end;
+    if (e + n > d->alloc) {
+        int b = d->begin;
+        if (b - n >= 2 * d->alloc / 3) {
             // we have enough space. Just not at the end -> move it.
-            ::memcpy(d->array, d->array + d->begin, n * sizeof(void *));
+            e -= b;
+            ::memcpy(d->array, d->array + b, e * sizeof(void *));
             d->begin = 0;
-            d->end = n;
         } else {
-            realloc(grow(d->alloc + 1));
+            realloc(grow(d->alloc + n));
         }
     }
-    return d->array + d->end++;
+    d->end = e + n;
+    return d->array + e;
+}
+
+// ensures that enough space is available to append one element
+void **QListData::append()
+{
+    return append(1);
 }
 
 // ensures that enough space is available to append the list
@@ -219,15 +227,7 @@ void **QListData::append(const QListData& l)
 // ensures that enough space is available to append the list
 void **QListData::append2(const QListData& l)
 {
-    Q_ASSERT(d->ref == 1);
-    int e = d->end;
-    int n = l.d->end - l.d->begin;
-    if (n) {
-        if (e + n > d->alloc)
-            realloc(grow(e + n));
-        d->end += n;
-    }
-    return d->array + e;
+    return append(l.d->end - l.d->begin);
 }
 
 void **QListData::prepend()
diff --git a/src/corelib/tools/qlist.h b/src/corelib/tools/qlist.h
index 5364e8e..fdebd7d 100644
--- a/src/corelib/tools/qlist.h
+++ b/src/corelib/tools/qlist.h
@@ -80,6 +80,7 @@ struct Q_CORE_EXPORT QListData {
     static Data shared_null;
     Data *d;
     void **erase(void **xi);
+    void **append(int n);
     void **append();
     void **append(const QListData &l);
     void **append2(const QListData &l); // remove in 5.0