Reworking internal file handling.

[pdclib] / functions / stdio / freopen.c

diff --git a/functions/stdio/freopen.c b/functions/stdio/freopen.c
index 2619eea9388ffd233b9c6e3fa309f0f06039c52d..a2c0adade6b91908d5644c7b3dbb1e7ad66fd6b7 100644 (file)
--- a/functions/stdio/freopen.c
+++ b/functions/stdio/freopen.c
@@ -1,15 +1,71 @@
-/* ----------------------------------------------------------------------------
- * $Id$
- * ----------------------------------------------------------------------------
- * Public Domain C Library - http://pdclib.sourceforge.net
- * This code is Public Domain. Use, modify, and redistribute at will.
- * --------------------------------------------------------------------------*/
+/* $Id$ */
 
-FILE * freopen( const char * restrict filename, const char * restrict mode, FILE * stream ) { /* TODO */ };
+/* freopen( const char *, const char *, FILE * )
 
-/* PDPC code - unreviewed
+   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_glue.h>
+#include <stdlib.h>
+
+/* Close any file currently associated with the given stream. Open the file
+   identified by the given filename with the given mode (equivalent to fopen()),
+   and associate it with the given stream. If filename is a NULL pointer,
+   attempt to change the mode of the given stream.
+   This implementation allows any mode changes.
+   (Primary use of this function is to redirect stdin, stdout, and stderr.)
+*/
+struct _PDCLIB_file_t * freopen( const char * _PDCLIB_restrict filename, const char * _PDCLIB_restrict mode, struct _PDCLIB_file_t * _PDCLIB_restrict stream )
 {
-    fclose(stream);
-    return (fopen(filename, mode));
+    unsigned int status = stream->status & ( _IONBF | _IOLBF | _IOFBF | _PDCLIB_FREEBUFFER | _PDCLIB_DELONCLOSE );
+    /* TODO: This function can change wide orientation of a stream */
+    if ( stream->status & _PDCLIB_FWRITE )
+    {
+        _PDCLIB_flushbuffer( stream );
+    }
+    _PDCLIB_close( stream->handle );
+    clearerr( stream );
+    /* FIXME: Copy filename into the FILE structure. */
+    /* FIXME: filename cannot reside in "big block" memory */
+    if ( filename == NULL )
+    {
+        filename = stream->filename;
+    }
+    if ( ( mode == NULL ) || ( filename[0] == '\0' ) )
+    {
+        return NULL;
+    }
+    if ( ( stream->status = _PDCLIB_filemode( mode ) ) == 0 )
+    {
+        return NULL;
+    }
+    /* Re-add the flags we saved above */
+    stream->status |= status;
+    stream->bufidx = 0;
+    stream->bufend = 0;
+    stream->ungetidx = 0;
+    /* TODO: Setting mbstate */
+    if ( ( stream->handle = _PDCLIB_open( filename, stream->status ) ) == _PDCLIB_NOHANDLE )
+    {
+        return NULL;
+    }
+    return stream;
 }
-*/
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    TESTCASE( NO_TESTDRIVER );
+    return TEST_RESULTS;
+}
+
+#endif