acr_test/examples/file/seekdir.c

/*
 * Copyright (c) 2006-2020, 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_posix.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 */