Provide more information about the error.

1 files changed, 7 insertions, 1 deletions

diff --git a/xdelta3/xdelta3-main.h b/xdelta3/xdelta3-main.h
index 010b8cb..5df29e2 100644
--- a/xdelta3/xdelta3-main.h
+++ b/xdelta3/xdelta3-main.h
@@ -2854,7 +2854,7 @@ main_set_source (xd3_stream *stream, xd3_cmd cmd,
         }
       else
         {
-          strcpy(sizebuf, " not seekable");
+          sizebuf[0] = 0;
         }
 
       XPR(NT "source %s winsize %s blksize %u%s\n",
@@ -3063,6 +3063,12 @@ main_getblk_func (xd3_stream *stream,
             {
               /* Could assert !IS_ENCODE(), this shouldn't happen
                * because of do_not_lru during encode. */
+              if (option_verbose)
+                {
+                  XPR(NT "copy lags source position by %"Q"u bytes\n", 
+                      sfile->source_position - pos);
+                }
+
               stream->msg = "non-seekable source: copy is too far back (try raising -B)";
               return XD3_TOOFARBACK;
             }