X-Git-Url: https://pd.if.org/git/?p=pdclib;a=blobdiff_plain;f=functions%2Fstdio%2Fclearerr.c;h=e569fd4085382801f8b34dedc20e8863e718461d;hp=6d80c8aeb381639c62b9fbf0a4194ff68b083bc7;hb=da0f3f353d417fed71f358a48d5d5394145e460d;hpb=13ee02fa27a739d9d602f801126eadcfbfeab8a8

diff --git a/functions/stdio/clearerr.c b/functions/stdio/clearerr.c
index 6d80c8a..e569fd4 100644
--- a/functions/stdio/clearerr.c
+++ b/functions/stdio/clearerr.c
@@ -1,5 +1,3 @@
-/* $Id$ */
-
 /* clearerr( FILE * )
 
    This file is part of the Public Domain C Library (PDCLib).
@@ -9,21 +7,53 @@
 #include <stdio.h>
 
 #ifndef REGTEST
+#include "_PDCLIB_io.h"
 
-void clearerr( struct _PDCLIB_file_t * stream )
+void _PDCLIB_clearerr_unlocked( FILE * stream )
 {
     stream->status &= ~( _PDCLIB_ERRORFLAG | _PDCLIB_EOFFLAG );
 }
 
+void clearerr( FILE * stream )
+{
+    _PDCLIB_flockfile( stream );
+    _PDCLIB_clearerr_unlocked( stream );
+    _PDCLIB_funlockfile( stream );
+}
+
 #endif
 
 #ifdef TEST
-#include <_PDCLIB_test.h>
+#include "_PDCLIB_test.h"
 
 int main( void )
 {
-    TESTCASE( NO_TESTDRIVER );
+    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
+