原始版本

RT_Thread/examples/file/seekdir.c

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+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2011-06-02     Bernard      first version
+ * 2020-04-12     Jianjia Ma   add msh cmd
+ */
+#include <dfs_file.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <sys/statfs.h>
+
+void seekdir_test(void)
+{
+    DIR * dirp;
+    long save3 = 0;
+    int i = 0;
+    struct dirent *dp;
+
+    dirp = opendir ("/");
+    save3 = telldir(dirp);
+    for (dp = readdir(dirp); dp != RT_NULL; dp = readdir(dirp))
+    {
+        rt_kprintf("direntry: %s\n", dp->d_name);
+
+        /* save the pointer of the third directory */
+        if (i++ == 3)
+        {
+            save3 = telldir(dirp);
+        }
+    }
+
+    /* get back to the third directory */
+    seekdir (dirp, save3);
+    rt_kprintf("seek dientry to: %d\n", save3);
+    for (dp = readdir(dirp); dp != RT_NULL; dp = readdir(dirp))
+    {
+        rt_kprintf("direntry: %s\n", dp->d_name);
+    }
+
+    /* close the directory */
+    closedir (dirp);
+}
+
+#ifdef RT_USING_FINSH
+#include <finsh.h>
+FINSH_FUNCTION_EXPORT(seekdir_test, perform directory seek test);
+MSH_CMD_EXPORT(seekdir_test, perform directory seek test);
+#endif /* RT_USING_FINSH */