3 files changed, 63 insertions, 2 deletions
diff --git a/lib/resource.c b/lib/resource.c
index 9e626815..289af933 100644
--- a/lib/resource.c
+++ b/lib/resource.c
@@ -328,6 +328,42 @@ mb_allocz(pool *p, unsigned size)
 }
 
 /**
+ * mb_realloc - reallocate a memory block
+ * @p: pool
+ * @m: memory block
+ * @size: new size of the block
+ *
+ * mb_realloc() changes the size of the memory block @m to a given size.
+ * The contents will be unchanged to the minimum of the old and new sizes;
+ * newly allocated memory will be uninitialized. If @m is NULL, the call
+ * is equivalent to mb_alloc(@p, @size).
+ *
+ * Like mb_alloc(), mb_realloc() also returns a pointer to the memory
+ * chunk , not to the resource, hence you have to free it using
+ * mb_free(), not rfree().
+ */
+void *
+mb_realloc(pool *p, void *m, unsigned size)
+{
+  struct mblock *ob = NULL;
+
+  if (m)
+    {
+      ob = SKIP_BACK(struct mblock, data, m);
+      if (ob->r.n.next)
+	rem_node(&ob->r.n);
+    }
+
+  struct mblock *b = xrealloc(ob, sizeof(struct mblock) + size);
+
+  b->r.class = &mb_class;
+  add_tail(&p->inside, &b->r.n);
+  b->size = size;
+  return b->data;
+}
+
+
+/**
  * mb_free - free a memory block
  * @m: memory block
  *
@@ -339,3 +375,4 @@ mb_free(void *m)
   struct mblock *b = SKIP_BACK(struct mblock, data, m);
   rfree(b);
 }
+
diff --git a/lib/resource.h b/lib/resource.h
index 42ed26ed..8dd441f0 100644
--- a/lib/resource.h
+++ b/lib/resource.h
@@ -47,6 +47,7 @@ extern pool root_pool;
 
 void *mb_alloc(pool *, unsigned size);
 void *mb_allocz(pool *, unsigned size);
+void *mb_realloc(pool *p, void *m, unsigned size);
 void mb_free(void *);
 
 /* Memory pools with linear allocation */
@@ -75,12 +76,13 @@ void sl_free(slab *, void *);
 #ifdef HAVE_LIBDMALLOC
 /*
  * The standard dmalloc macros tend to produce lots of namespace
- * conflicts and we use only xmalloc and xfree, so we can define
- * the stubs ourselves.
+ * conflicts and we use only xmalloc, xrealloc and xfree, so we
+ * can define the stubs ourselves.
  */
 #define DMALLOC_DISABLE
 #include <dmalloc.h>
 #define xmalloc(size) _xmalloc_leap(__FILE__, __LINE__, size)
+#define xrealloc(size) _xrealloc_leap(__FILE__, __LINE__, size)
 #define xfree(ptr) _xfree_leap(__FILE__, __LINE__, ptr)
 #else
 /*
@@ -89,7 +91,9 @@ void sl_free(slab *, void *);
  * the renaming.
  */
 #define xmalloc bird_xmalloc
+#define xrealloc bird_xrealloc
 void *xmalloc(unsigned);
+void *xrealloc(void *, unsigned);
 #define xfree(x) free(x)
 #endif
 
diff --git a/lib/xmalloc.c b/lib/xmalloc.c
index bc386c83..da2f0941 100644
--- a/lib/xmalloc.c
+++ b/lib/xmalloc.c
@@ -32,4 +32,24 @@ xmalloc(unsigned size)
   die("Unable to allocate %d bytes of memory", size);
 }
 
+/**
+ * xrealloc - realloc with checking
+ * @ptr: original memory block
+ * @size: block size
+ *
+ * This function is equivalent to realloc() except that in case of
+ * failure it calls die() to quit the program instead of returning
+ * a %NULL pointer.
+ *
+ * Wherever possible, please use the memory resources instead.
+ */
+void *
+xrealloc(void *ptr, unsigned size)
+{
+  void *p = realloc(ptr, size);
+  if (p)
+    return p;
+  die("Unable to allocate %d bytes of memory", size);
+}
+
 #endif