Make sure that non-existent files still affect hashing

The fact that a file _doesn't_ exist is significant, so adding such a
file to a computed hash should still influence the output.

* hash.cxx (hash::add_file): add bogus stat info for non-existent files

1 files changed, 6 insertions, 6 deletions

diff --git a/hash.cxx b/hash.cxx
index e550be76..a0608c03 100644
--- a/hash.cxx
+++ b/hash.cxx
@@ -52,12 +52,12 @@ hash::add_file(const std::string& filename)
 {
   struct stat st;
 
-  if (stat(filename.c_str(), &st) == 0)
-    {
-      add(filename);
-      add(st.st_size);
-      add(st.st_mtime);
-    }
+  if (stat(filename.c_str(), &st) != 0)
+    st.st_size = st.st_mtime = -1;
+
+  add(filename);
+  add(st.st_size);
+  add(st.st_mtime);
 }