add some file test template.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@398 bbd45198-f89e-11dd-88c7-29a3b14d5316

examples/file/writespeed.c

@@ -0,0 +1,56 @@
+/*
+ * File      : writespeed.c
+ * This file is part of RT-TestCase in RT-Thread RTOS
+ * COPYRIGHT (C) 2010, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2010-02-10     Bernard      first version
+ */
+#include <rtthread.h>
+#include <dfs_posix.h>
+
+void writespeed(const char* filename, int total_length, int block_size)
+{
+    int fd;
+    char *buff_ptr;
+    rt_tick_t tick;
+
+    fd = open(filename, 0, O_WRONLY);
+    if (fd < 0)
+    {
+        rt_kprintf("open file:%s failed\n", filename);
+        return;
+    }
+
+    buff_ptr = rt_malloc(block_size);
+    if (buff_ptr == RT_NULL)
+    {
+        rt_kprintf("no memory\n");
+        close(fd);
+
+        return;
+    }
+
+	/* prepare write data */
+
+    tick = rt_tick_get();
+
+    tick = rt_tick_get() - tick;
+
+	/* close file and release memory */
+    close(fd);
+	rt_free(buff_ptr);
+
+    /* calculate write speed */
+    rt_kprintf("File write speed: %d byte/s\n", total_length/ (tick/RT_TICK_PER_SECOND));
+}
+
+#ifdef RT_USING_FINSH
+#include <finsh.h>
+FINSH_FUNCTION_EXPORT(writespeed, perform file write test);
+#endif