Adding malloc(), free(), and realloc().

[pdclib] / functions / stdlib / free.c

diff --git a/functions/stdlib/free.c b/functions/stdlib/free.c
new file mode 100644 (file)
index 0000000..632f670
--- /dev/null
+++ b/functions/stdlib/free.c
@@ -0,0 +1,52 @@
+/* $Id$ */
+
+/* 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()
+{
+    BEGIN_TESTS;
+    /* tests covered in malloc test driver */
+    return TEST_RESULTS;
+}
+
+#endif