X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstdlib%2Ffree.c;h=6b63741913a844f3378341316cb47f03c2ea2d4c;hb=d02f38605b53cdff5460cc6b9e1b2a80c3a2ba4c;hp=5801248ebb22f10631e397976ac76eedca754873;hpb=34893ecc2200dc7017c36a54cb6c5f4c2378b5ec;p=pdclib

diff --git a/functions/stdlib/free.c b/functions/stdlib/free.c
index 5801248..6b63741 100644
--- a/functions/stdlib/free.c
+++ b/functions/stdlib/free.c
@@ -1,8 +1,51 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
-
-void free( void * ptr ) { /* TODO */ };
+/* $Id$ */
+
+/* Release $Name$ */
+
+/* void free( void * )
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stdlib.h>
+
+#ifndef REGTEST
+
+#ifndef _PDCLIB_INT_H
+#define _PDCLIB_INT_H _PDCLIB_INT_H
+#include <_PDCLIB_int.h>
+#endif
+
+/* TODO: Primitive placeholder. Much room for improvement. */
+
+/* structure holding first and last element of free node list */
+extern struct _PDCLIB_headnode_t _PDCLIB_memlist;
+
+void free( void * ptr )
+{
+    ptr = (void *)( (char *)ptr - sizeof( struct _PDCLIB_memnode_t ) );
+    ( (struct _PDCLIB_memnode_t *)ptr )->next = NULL;
+    if ( _PDCLIB_memlist.last != NULL )
+    {
+        _PDCLIB_memlist.last->next = ptr;
+    }
+    else
+    {
+        _PDCLIB_memlist.first = ptr;
+    }
+    _PDCLIB_memlist.last = ptr;
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    /* tests covered in malloc test driver */
+    return TEST_RESULTS;
+}
+
+#endif