Avoid trying to mmap() or read a zero-byte database file.

src/recdb.c (parse_database): If the file is empty, we can just return an
  empty database without trying to mmap() it (zero-sized mmap generates
  EINVAL) or trying to read it.

diff --git a/src/recdb.c b/src/recdb.c
index 17dbccc958b9f4c85aba4774e45a84745fd3c387..cba98139082c0d1e03a6fb7c431d52d471f8642b 100644 (file)
--- a/src/recdb.c
+++ b/src/recdb.c
@@ -93,7 +93,7 @@ typedef struct recdb_outfile {
 } RECDB_OUT;
 
 #ifdef HAVE_MMAP
-static int mmap_error=0;
+static int mmap_error;
 #endif
 
 #define EOL '\n'
@@ -616,6 +616,9 @@ parse_database(const char *filename)
         return NULL;
     }
     recdb.length = (size_t)statinfo.st_size;
+    if (recdb.length == 0) {
+        return alloc_database();
+    }
 
 #ifdef HAVE_MMAP
     /* Try mmap */