It turns out that realloc(ptr, 0) --> free(ptr) is not actually required by the C standard (whereas realloc(NULL, size) --> malloc(size) is).

Therefore, explicitly model the behaviour expected by our libraries (that realloc of 0 size is equivalent to free).

svn path=/trunk/netsurf/; revision=10524

1 files changed, 18 insertions, 0 deletions

diff --git a/render/box.c b/render/box.c
index 9bb7e59fe..e61dee8ff 100644
--- a/render/box.c
+++ b/render/box.c
@@ -51,6 +51,24 @@ struct box_duplicate_llist {
 static struct box_duplicate_llist *box_duplicate_last = NULL;
 
 /**
+ * Allocator
+ *
+ * \param ptr   Pointer to reallocate, or NULL for new allocation
+ * \param size  Number of bytes requires
+ * \param pw    Allocation context
+ * \return Pointer to allocated block, or NULL on failure
+ */
+void *box_style_alloc(void *ptr, size_t len, void *pw)
+{
+	if (len == 0) {
+		free(ptr);
+		return NULL;
+	}
+
+	return realloc(ptr, len);
+}
+
+/**
  * Destructor for box nodes which own styles
  *
  * @param b The box being destroyed.