X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstdio%2Fclearerr.c;h=91cd00a6655e9d619efd5a5f6e48301a0d0f832a;hb=d865c4403fc91d1f1ac95ba76febcee9f429bb97;hp=1adce827e840a6d67bbdb69ee7897bb87700338c;hpb=34893ecc2200dc7017c36a54cb6c5f4c2378b5ec;p=pdclib

diff --git a/functions/stdio/clearerr.c b/functions/stdio/clearerr.c
index 1adce82..91cd00a 100644
--- a/functions/stdio/clearerr.c
+++ b/functions/stdio/clearerr.c
@@ -1,8 +1,52 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
-
-void clearerr( FILE * stream ) { /* TODO */ };
+/* 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 )
+{
+    FILE * fh;
+    TESTCASE( ( fh = tmpfile() ) != NULL );
+    /* Flags should be clear */
+    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 ) );
+    /* reopen() the file write-only */
+    TESTCASE( ( fh = freopen( NULL, "w", fh ) ) != NULL );
+    /* Reading from write-only stream - should provoke error */
+    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