1 files changed, 4 insertions, 4 deletions
diff --git a/zutils.cc b/zutils.cc
index 798da03..850504a 100644
--- a/zutils.cc
+++ b/zutils.cc
@@ -54,13 +54,13 @@ int readblock( const int fd, uint8_t * const buf, const int size )
   errno = 0;
   while( rest > 0 )
     {
-    errno = 0;
     const int n = read( fd, buf + size - rest, rest );
     if( n > 0 ) rest -= n;
     else if( n == 0 ) break;				// EOF
     else if( errno != EINTR && errno != EAGAIN ) break;
+    errno = 0;
     }
-  return ( rest > 0 ) ? size - rest : size;
+  return size - rest;
   }
 
 
@@ -73,12 +73,12 @@ int writeblock( const int fd, const uint8_t * const buf, const int size )
   errno = 0;
   while( rest > 0 )
     {
-    errno = 0;
     const int n = write( fd, buf + size - rest, rest );
     if( n > 0 ) rest -= n;
     else if( n < 0 && errno != EINTR && errno != EAGAIN ) break;
+    errno = 0;
     }
-  return ( rest > 0 ) ? size - rest : size;
+  return size - rest;
   }