X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstdio%2Fclearerr.c;h=2bfe7c508448eb92830605de1f78031825ef16d2;hb=9f196c54742b59da53f81d9e2e7401864de3138b;hp=1adce827e840a6d67bbdb69ee7897bb87700338c;hpb=dcc8a8e99f69e090a03b7b868443addbc0817820;p=pdclib.old

diff --git a/functions/stdio/clearerr.c b/functions/stdio/clearerr.c
index 1adce82..2bfe7c5 100644
--- a/functions/stdio/clearerr.c
+++ b/functions/stdio/clearerr.c
@@ -1,8 +1,58 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
-
-void clearerr( FILE * stream ) { /* TODO */ };
+/* $Id$ */
+
+/* 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
+
+void clearerr( struct _PDCLIB_file_t * stream )
+{
+    stream->status &= ~( _PDCLIB_ERRORFLAG | _PDCLIB_EOFFLAG );
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+#ifndef REGTEST
+    FILE file = { 0, { 0, 0 }, NULL, 0, 0, 0, _IONBF, NULL, NULL };
+    FILE * fh = &file;
+    TESTCASE( ! ferror( fh ) );
+    TESTCASE( ! feof( fh ) );
+    fh->status |= _PDCLIB_ERRORFLAG;
+    TESTCASE( ferror( fh ) );
+    TESTCASE( ! feof( fh ) );
+    clearerr( fh );
+    TESTCASE( ! ferror( fh ) );
+    TESTCASE( ! feof( fh ) );
+    fh->status |= _PDCLIB_EOFFLAG;
+    TESTCASE( ! ferror( fh ) );
+    TESTCASE( feof( fh ) );
+    clearerr( fh );
+    TESTCASE( ! ferror( fh ) );
+    TESTCASE( ! feof( fh ) );
+    fh->status |= _PDCLIB_EOFFLAG | _PDCLIB_ERRORFLAG;
+    TESTCASE( ferror( fh ) );
+    TESTCASE( feof( fh ) );
+    clearerr( fh );
+    TESTCASE( ! ferror( fh ) );
+    TESTCASE( ! feof( fh ) );
+#else
+    /* TODO: The above is ad-hoc and PDCLib specific. A better test driver
+       should be internals-agnostic (provoking the error / eof flag by
+       "regular" operations).
+    */
+    TESTCASE( NO_TESTDRIVER );
+#endif
+    return TEST_RESULTS;
+}
+
+#endif