X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstdio%2Ffreopen.c;h=906096f4a5cfbc57e6ab28770b9e2bc7dfd67f3c;hb=526e9954c39f30819e421cb74e82aa59d5a41013;hp=8758814b51018404f788a9ddb29b1ab4ac728bbc;hpb=0a5395faab237ba9008352b0f4bee9659bbd3d5f;p=pdclib

diff --git a/functions/stdio/freopen.c b/functions/stdio/freopen.c
index 8758814..906096f 100644
--- a/functions/stdio/freopen.c
+++ b/functions/stdio/freopen.c
@@ -1,15 +1,56 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// 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 the following mode changes: TODO
+   (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));
+    /* FIXME: This is ad-hoc (to make the vprintf() testdriver work), and must be checked. */
+    /* FIXME: If filename is NULL, change mode. */
+    /* TODO: This function can change wide orientation of a stream */
+    if ( filename == NULL ) return NULL;
+    if ( stream->status & _PDCLIB_FWRITE ) fflush( stream );
+    if ( stream->status & _PDCLIB_LIBBUFFER ) free( stream->buffer );
+    _PDCLIB_close( stream->handle );
+    clearerr( stream );
+    if ( ( mode == NULL ) || ( filename[0] == '\0' ) ) return NULL;
+    if ( ( stream->status = _PDCLIB_filemode( mode ) ) == 0 ) return NULL;
+    stream->handle = _PDCLIB_open( filename, stream->status );
+    if ( ( stream->buffer = malloc( BUFSIZ ) ) == NULL ) return NULL;
+    stream->bufsize = BUFSIZ;
+    stream->bufidx = 0;
+    stream->status |= _PDCLIB_LIBBUFFER;
+    /* TODO: Setting mbstate */
+    return stream;
 }
-*/
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    TESTCASE( NO_TESTDRIVER );
+    return TEST_RESULTS;
+}
+
+#endif