1 files changed, 10 insertions, 5 deletions

diff --git a/src/ralloc.c b/src/ralloc.c
index 13587b9ffd4..896ad9f3155 100644
--- a/src/ralloc.c
+++ b/src/ralloc.c
@@ -636,7 +636,8 @@ resize_bloc (bloc_ptr bloc, SIZE size)
             }
           else
             {
-              memmove (b->new_data, b->data, b->size);
+              if (b->new_data != b->data)
+                memmove (b->new_data, b->data, b->size);
               *b->variable = b->data = b->new_data;
             }
         }
@@ -647,7 +648,8 @@ resize_bloc (bloc_ptr bloc, SIZE size)
         }
       else
         {
-          memmove (bloc->new_data, bloc->data, old_size);
+          if (bloc->new_data != bloc->data)
+            memmove (bloc->new_data, bloc->data, old_size);
           memset ((char *) bloc->new_data + old_size, 0, size - old_size);
           *bloc->variable = bloc->data = bloc->new_data;
         }
@@ -663,7 +665,8 @@ resize_bloc (bloc_ptr bloc, SIZE size)
             }
           else
             {
-              memmove (b->new_data, b->data, b->size);
+              if (b->new_data != b->data)
+                memmove (b->new_data, b->data, b->size);
               *b->variable = b->data = b->new_data;
             }
         }
@@ -816,7 +819,8 @@ r_alloc_sbrk (long int size)
              header.  */
           for (b = last_bloc; b != NIL_BLOC; b = b->prev)
             {
-              memmove (b->new_data, b->data, b->size);
+              if (b->new_data != b->data)
+                memmove (b->new_data, b->data, b->size);
               *b->variable = b->data = b->new_data;
             }
 
@@ -862,7 +866,8 @@ r_alloc_sbrk (long int size)
 
           for (b = first_bloc; b != NIL_BLOC; b = b->next)
             {
-              memmove (b->new_data, b->data, b->size);
+              if (b->new_data != b->data)
+                memmove (b->new_data, b->data, b->size);
               *b->variable = b->data = b->new_data;
             }
         }