X-Git-Url: https://pd.if.org/git/?p=pdclib;a=blobdiff_plain;f=functions%2Fstdio%2Ffreopen.c;h=d647d32033110ee6167158774af94cfad5e9a41f;hp=8758814b51018404f788a9ddb29b1ab4ac728bbc;hb=da0f3f353d417fed71f358a48d5d5394145e460d;hpb=0a5395faab237ba9008352b0f4bee9659bbd3d5f

diff --git a/functions/stdio/freopen.c b/functions/stdio/freopen.c
index 8758814..d647d32 100644
--- a/functions/stdio/freopen.c
+++ b/functions/stdio/freopen.c
@@ -1,15 +1,120 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
+/* freopen( const char *, const char *, FILE * )
 
-FILE * freopen( const char * restrict filename, const char * restrict mode, FILE * stream ) { /* TODO */ };
+   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>
 
-/* PDPC code - unreviewed
+#ifndef REGTEST
+#include "_PDCLIB_io.h"
+#include "_PDCLIB_glue.h"
+#include <stdlib.h>
+#include <string.h>
+
+FILE * freopen( 
+    const char * _PDCLIB_restrict filename, 
+    const char * _PDCLIB_restrict mode, 
+    FILE * _PDCLIB_restrict stream 
+)
 {
-    fclose(stream);
-    return (fopen(filename, mode));
+    _PDCLIB_flockfile( stream );
+
+    unsigned int status = stream->status & 
+        ( _IONBF | _IOLBF | _IOFBF | _PDCLIB_FREEBUFFER 
+        | _PDCLIB_DELONCLOSE | _PDCLIB_STATIC );
+
+    /* TODO: This function can change wide orientation of a stream */
+    if ( stream->status & _PDCLIB_FWRITE )
+    {
+        _PDCLIB_flushbuffer( stream );
+    }
+    if ( ( filename == NULL ) && ( stream->filename == NULL ) )
+    {
+        /* TODO: Special handling for mode changes on std-streams */
+        _PDCLIB_funlockfile( stream );
+        return NULL;
+    }
+    stream->ops->close(stream->handle);
+    
+    /* TODO: It is not nice to do this on a stream we just closed.
+       It does not matter with the current implementation of clearerr(),
+       but it might start to matter if someone replaced that implementation.
+    */
+    _PDCLIB_clearerr_unlocked( stream );
+    /* The new filename might not fit the old buffer */
+    if ( filename == NULL )
+    {
+        /* Use previous filename */
+        filename = stream->filename;
+    }
+    else if ( ( stream->filename != NULL ) && ( strlen( stream->filename ) >= strlen( filename ) ) )
+    {
+        /* Copy new filename into existing buffer */
+        strcpy( stream->filename, filename );
+    }
+    else
+    {
+        /* Allocate new buffer */
+        if ( ( stream->filename = (char *)malloc( strlen( filename ) ) ) == NULL )
+        {
+            _PDCLIB_funlockfile( stream );
+            return NULL;
+        }
+        strcpy( stream->filename, filename );
+    }
+    if ( ( mode == NULL ) || ( filename[0] == '\0' ) )
+    {
+        _PDCLIB_funlockfile( stream );
+        return NULL;
+    }
+    if ( ( stream->status = _PDCLIB_filemode( mode ) ) == 0 )
+    {
+        _PDCLIB_funlockfile( stream );
+        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 ( ! _PDCLIB_open( &stream->handle, &stream->ops, filename, 
+                         stream->status ) )
+    {
+        _PDCLIB_funlockfile( stream );
+        return NULL;
+    }
+    _PDCLIB_funlockfile( stream );
+    return stream;
 }
-*/
+
+#endif
+
+#ifdef TEST
+#include "_PDCLIB_test.h"
+
+int main( void )
+{
+    FILE * fin;
+    FILE * fout;
+    TESTCASE( ( fin = fopen( testfile1, "wb+" ) ) != NULL );
+    TESTCASE( fputc( 'x', fin ) == 'x' );
+    TESTCASE( fclose( fin ) == 0 );
+    TESTCASE( ( fin = freopen( testfile1, "rb", stdin ) ) != NULL );
+    TESTCASE( getchar() == 'x' );
+
+    TESTCASE( ( fout = freopen( testfile2, "wb+", stdout ) ) != NULL );
+    TESTCASE( putchar( 'x' ) == 'x' );
+    rewind( fout );
+    TESTCASE( fgetc( fout ) == 'x' );
+
+    TESTCASE( fclose( fin ) == 0 );
+    TESTCASE( fclose( fout ) == 0 );
+    TESTCASE( remove( testfile1 ) == 0 );
+    TESTCASE( remove( testfile2 ) == 0 );
+
+    return TEST_RESULTS;
+}
+
+#endif