PDCLIB-16: Add _unlocked variations of all I/O routines; move work into these versions

[pdclib] / functions / stdio / ferror.c

diff --git a/functions/stdio/ferror.c b/functions/stdio/ferror.c
index a1855a32a7adb0eab2668539c2a97f864842cbfe..394dcda2bc7dd07dee9cad93b61dfd95ec50ddd1 100644 (file)
--- a/functions/stdio/ferror.c
+++ b/functions/stdio/ferror.c
@@ -1,8 +1,38 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
-
-int ferror( FILE * stream ) { /* TODO */ };
+/* $Id$ */
+
+/* ferror( FILE * )
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stdio.h>
+
+#ifndef REGTEST
+
+int ferror_unlocked( struct _PDCLIB_file_t * stream )
+{
+    return stream->status & _PDCLIB_ERRORFLAG;
+}
+
+int ferror( struct _PDCLIB_file_t * stream )
+{
+    flockfile( stream );
+    int error = ferror_unlocked( stream );
+    funlockfile( stream );
+    return error;
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    /* Testing covered by clearerr(). */
+    return TEST_RESULTS;
+}
+
+#endif
+