resurrect malloc test

tests/malloc/Makefile

@@ -0,0 +1,18 @@
+# name of your application
+APPLICATION = test_malloc
+
+# If no BOARD is found in the environment, use this default:
+BOARD ?= native
+
+# This has to be the absolute path to the RIOT base directory:
+RIOTBASE ?= $(CURDIR)/../..
+
+# Comment this out to disable code in RIOT that does safety checking
+# which is not needed in a production environment but helps in the
+# development process:
+CFLAGS += -DDEVELHELP
+
+# Change this to 0 show compiler invocation lines by default:
+QUIET ?= 1
+
+include $(RIOTBASE)/Makefile.include

tests/malloc/main.c

@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2013 Benjamin Valentin <benpicco@zedat.fu-berlin.de>
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser General
+ * Public License v2.1. See the file LICENSE in the top level directory for more
+ * details.
+ */
+
+/**
+ * @ingroup tests
+ * @{
+ *
+ * @file
+ * @brief	Simple malloc/free test
+ *
+ *
+ * @author	Benjamin Valentin <benpicco@zedat.fu-berlin.de>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define CHUNK_SIZE 1024
+
+struct node {
+    struct node *next;
+    void *ptr;
+};
+
+int total = 0;
+
+void fill_memory(struct node *head)
+{
+    while (head && (head->ptr = malloc(CHUNK_SIZE))) {
+        printf("Allocated %d Bytes at 0x%p, total %d\n", CHUNK_SIZE, head->ptr, total += CHUNK_SIZE);
+        memset(head->ptr, '@', CHUNK_SIZE);
+        head = head->next = malloc(sizeof(struct node));
+        head->ptr =  0;
+        head->next = 0;
+        total += sizeof(struct node);
+    }
+}
+
+void free_memory(struct node *head)
+{
+    struct node *old_head;
+
+    while (head) {
+        if (head->ptr) {
+            printf("Free %d Bytes at 0x%p, total %d\n", CHUNK_SIZE, head->ptr, total -= CHUNK_SIZE);
+            free(head->ptr);
+        }
+
+        if (head->next) {
+            old_head = head;
+            head = head->next;
+            free(old_head);
+        }
+        else {
+            free(head);
+            head = 0;
+        }
+
+        total -= sizeof(struct node);
+    }
+}
+
+int main(void)
+{
+    while (1) {
+        struct node *head = malloc(sizeof(struct node));
+        total += sizeof(struct node);
+
+        fill_memory(head);
+        free_memory(head);
+    }
+
+    return 0;
+}