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

[pdclib] / functions / stdlib / realloc.c

diff --git a/functions/stdlib/realloc.c b/functions/stdlib/realloc.c
new file mode 100644 (file)
index 0000000..df5fca1
--- /dev/null
+++ b/functions/stdlib/realloc.c
@@ -0,0 +1,48 @@
+/* $Id$ */
+
+/* Release $Name$ */
+
+/* void * realloc( void *, size_t )
+
+   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>
+#include <string.h>
+#include <stddef.h>
+
+#ifndef REGTEST
+
+/* TODO: Primitive placeholder. Improve. */
+
+void * realloc( void * ptr, size_t size )
+{
+    struct _PDCLIB_memnode_t * baseptr = (struct _PDCLIB_memnode_t *)( (char *)ptr - sizeof( struct _PDCLIB_memnode_t ) );
+    if ( baseptr->size >= size )
+    {
+        return ptr;
+    }
+    else
+    {
+        void * newptr = malloc( size );
+        memcpy( newptr, ptr, baseptr->size );
+        free( ptr );
+        return newptr;
+    }
+    return NULL;
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main()
+{
+    BEGIN_TESTS;
+    /* tests covered in malloc test driver */
+    return TEST_RESULTS;
+}
+
+#endif