compat: Add simplified merge sort implementation from glibc

diff --git a/diffcore-order.c b/diffcore-order.c
index 2a4bd8232eb185f195c513c3509a72a92d172818..23e93852d8c701760d56e7e728dba7c08367fbe8 100644 (file)
--- a/diffcore-order.c
+++ b/diffcore-order.c
@@ -48,11 +48,8 @@ static void prepare_order(const char *orderfile)
                                if (*ep == '\n') {
                                        *ep = 0;
                                        order[cnt] = cp;
-                               }
-                               else {
-                                       order[cnt] = xmalloc(ep-cp+1);
-                                       memcpy(order[cnt], cp, ep-cp);
-                                       order[cnt][ep-cp] = 0;
+                               } else {
+                                       order[cnt] = xmemdupz(cp, ep - cp);
                                }
                                cnt++;
                        }