X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstdio%2Ffflush.c;h=e03079fcc9c17fdf661a961b77fdbec46cbbab60;hb=0e35e82c5e9a0804864839e8fc0e985b1ae41f07;hp=a74f77a7663e661a179d0049459bf5b65f96ded4;hpb=dcc8a8e99f69e090a03b7b868443addbc0817820;p=pdclib.old

diff --git a/functions/stdio/fflush.c b/functions/stdio/fflush.c
index a74f77a..e03079f 100644
--- a/functions/stdio/fflush.c
+++ b/functions/stdio/fflush.c
@@ -1,8 +1,62 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
-
-int fflush( FILE * stream ) { /* TODO */ };
+/* $Id$ */
+
+/* fflush( 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>
+
+extern FILE * _PDCLIB_filelist;
+
+int fflush_unlocked( FILE * stream )
+{
+    if ( stream == NULL )
+    {
+        stream = _PDCLIB_filelist;
+        /* TODO: Check what happens when fflush( NULL ) encounters write errors, in other libs */
+        int rc = 0;
+        while ( stream != NULL )
+        {
+            if ( stream->status & _PDCLIB_FWRITE )
+            {
+                if ( _PDCLIB_flushbuffer( stream ) == EOF )
+                {
+                    rc = EOF;
+                }
+            }
+            stream = stream->next;
+        }
+        return rc;
+    }
+    else
+    {
+        return _PDCLIB_flushbuffer( stream );
+    }
+}
+
+int fflush( FILE * stream )
+{
+    flockfile( stream );
+    int res = fflush_unlocked(stream);
+    funlockfile( stream );
+    return res;
+}
+                
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    /* Testing covered by ftell.c */
+    return TEST_RESULTS;
+}
+
+#endif
+