--- a/src/dmgrowbuf.c	Wed Jun 13 01:34:46 2018 +0300
+++ b/src/dmgrowbuf.c	Wed Jun 13 01:37:36 2018 +0300
@@ -171,6 +171,7 @@
     // For buffers growing backwards, we must move the
     // current data to the end of the buffer ..
     size_t clrsize = nsize - buf->size;
+    DM_DBG("    clrsize=%" DM_PRIu_SIZE_T "\n", clrsize);
     if (buf->backwards)
     {
         memmove(buf->data + clrsize, buf->data, clrsize);
@@ -208,6 +209,9 @@
         (buf->backwards && amount >= buf->offs) ||
         (!buf->backwards && buf->offs + amount >= buf->size))
     {
+        DM_DBG("dmGrowBufGrow(%p, amount=%" DM_PRIu_SIZE_T "): grow=%" DM_PRIu_SIZE_T "\n",
+            buf, amount, grow);
+
         if (!dmGrowBufRealloc(buf, buf->size + grow, TRUE))
             return FALSE;
     }