X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstdio%2Fferror.c;h=f683787e567975ad8cd759b58bee255a16ddc990;hb=0e35e82c5e9a0804864839e8fc0e985b1ae41f07;hp=a1855a32a7adb0eab2668539c2a97f864842cbfe;hpb=dcc8a8e99f69e090a03b7b868443addbc0817820;p=pdclib.old

diff --git a/functions/stdio/ferror.c b/functions/stdio/ferror.c
index a1855a3..f683787 100644
--- a/functions/stdio/ferror.c
+++ b/functions/stdio/ferror.c
@@ -1,8 +1,39 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// 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
+#include <_PDCLIB_io.h>
+
+int ferror_unlocked( FILE * stream )
+{
+    return stream->status & _PDCLIB_ERRORFLAG;
+}
+
+int ferror( FILE * 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
+