X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstdio%2Ffreopen.c;h=e8cc72a1f2924cba8e56c8acc5947ff2525ed7bf;hb=393020b6e48719d27699dea6b29e53025bbd5123;hp=23c12e01946c94eba1156a18f662b58822c09c08;hpb=34893ecc2200dc7017c36a54cb6c5f4c2378b5ec;p=pdclib

diff --git a/functions/stdio/freopen.c b/functions/stdio/freopen.c
index 23c12e0..e8cc72a 100644
--- a/functions/stdio/freopen.c
+++ b/functions/stdio/freopen.c
@@ -1,8 +1,56 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
-
-FILE * freopen( const char * restrict filename, const char * restrict mode, FILE * stream ) { /* TODO */ };
+/* $Id$ */
+
+/* freopen( const char *, const char * )
+
+   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 * stream )
+{
+    /* 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