X-Git-Url: https://pd.if.org/git/?p=pdclib;a=blobdiff_plain;f=functions%2Fstdio%2Fclearerr.c;h=e569fd4085382801f8b34dedc20e8863e718461d;hp=28a042d8bd12affa09be2ea7d11737a5931f8ec2;hb=da0f3f353d417fed71f358a48d5d5394145e460d;hpb=1d9d92ba957a0b8307c9a65c35867fde68e6533b

diff --git a/functions/stdio/clearerr.c b/functions/stdio/clearerr.c
index 28a042d..e569fd4 100644
--- a/functions/stdio/clearerr.c
+++ b/functions/stdio/clearerr.c
@@ -1,18 +1,59 @@
-/* ----------------------------------------------------------------------------
- * $Id$
- * ----------------------------------------------------------------------------
- * Public Domain C Library - http://pdclib.sourceforge.net
- * This code is Public Domain. Use, modify, and redistribute at will.
- * --------------------------------------------------------------------------*/
-
-#ifndef __FILE_H
-#define __FILE_H __FILE_H
-#include <__FILE.h>
-#endif // __FILE_H
-
-void clearerr( FILE * fh )
+/* clearerr( 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"
+
+void _PDCLIB_clearerr_unlocked( FILE * stream )
+{
+    stream->status &= ~( _PDCLIB_ERRORFLAG | _PDCLIB_EOFFLAG );
+}
+
+void clearerr( FILE * stream )
 {
-    fh->ErrorIndicator = 0;
-    fh->EOFIndicator = 0;
-    return;
+    _PDCLIB_flockfile( stream );
+    _PDCLIB_clearerr_unlocked( stream );
+    _PDCLIB_funlockfile( stream );
 }
+
+#endif
+
+#ifdef TEST
+#include "_PDCLIB_test.h"
+
+int main( void )
+{
+    FILE * fh;
+    TESTCASE( ( fh = tmpfile() ) != NULL );
+    /* Flags should be clear */
+    TESTCASE( ! ferror( fh ) );
+    TESTCASE( ! feof( fh ) );
+    /* Reading from input stream - should provoke error */
+    /* FIXME: Apparently glibc disagrees on this assumption. How to provoke error on glibc? */
+    TESTCASE( fgetc( fh ) == EOF );
+    TESTCASE( ferror( fh ) );
+    TESTCASE( ! feof( fh ) );
+    /* clearerr() should clear flags */
+    clearerr( fh );
+    TESTCASE( ! ferror( fh ) );
+    TESTCASE( ! feof( fh ) );
+    /* Reading from empty stream - should provoke EOF */
+    rewind( fh );
+    TESTCASE( fgetc( fh ) == EOF );
+    TESTCASE( ! ferror( fh ) );
+    TESTCASE( feof( fh ) );
+    /* clearerr() should clear flags */
+    clearerr( fh );
+    TESTCASE( ! ferror( fh ) );
+    TESTCASE( ! feof( fh ) );
+    TESTCASE( fclose( fh ) == 0 );
+    return TEST_RESULTS;
+}
+
+#endif
+