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@@ -1,123 +1,168 @@
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/*
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- * 代码清单:文件读写例子
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+ * Copyright (c) 2006-2020, RT-Thread Development Team
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*
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- * 这个例子演示了如何读写一个文件,特别是写的时候应该如何操作。
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+ * SPDX-License-Identifier: Apache-2.0
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+ *
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+ * Change Logs:
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+ * Date Author Notes
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+ * 2010-02-10 Bernard first version
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+ * 2020-04-12 Jianjia Ma add msh cmd
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*/
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#include <rtthread.h>
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-#include <dfs_posix.h> /* 当需要使用文件操作时,需要包含这个头文件 */
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-
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-#define TEST_FN "/test.dat"
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+#include <dfs_posix.h>
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-/* 测试用的数据和缓冲 */
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-static char test_data[120], buffer[120];
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+#define TEST_DATA_LEN 120
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-/* 文件读写测试 */
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+/* file read write test */
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void readwrite(const char* filename)
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{
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int fd;
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int index, length;
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+ char* test_data;
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+ char* buffer;
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+ int block_size = TEST_DATA_LEN;
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- /* 只写 & 创建 打开 */
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- fd = open(TEST_FN, O_WRONLY | O_CREAT | O_TRUNC, 0);
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+ /* open with write only & create */
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+ fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0);
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if (fd < 0)
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{
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rt_kprintf("open file for write failed\n");
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return;
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}
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- /* 准备写入数据 */
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- for (index = 0; index < sizeof(test_data); index ++)
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+ test_data = rt_malloc(block_size);
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+ if (test_data == RT_NULL)
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+ {
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+ rt_kprintf("no memory\n");
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+ close(fd);
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+ return;
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+ }
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+
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+ buffer = rt_malloc(block_size);
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+ if (buffer == RT_NULL)
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+ {
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+ rt_kprintf("no memory\n");
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+ close(fd);
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+ rt_free(test_data);
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+ return;
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+ }
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+
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+ /* prepare some data */
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+ for (index = 0; index < block_size; index ++)
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{
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test_data[index] = index + 27;
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}
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- /* 写入数据 */
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- length = write(fd, test_data, sizeof(test_data));
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- if (length != sizeof(test_data))
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+ /* write to file */
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+ length = write(fd, test_data, block_size);
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+ if (length != block_size)
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{
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rt_kprintf("write data failed\n");
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close(fd);
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- return;
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+ goto __exit;
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}
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- /* 关闭文件 */
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+ /* close file */
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close(fd);
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- /* 只写并在末尾添加打开 */
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- fd = open(TEST_FN, O_WRONLY | O_CREAT | O_APPEND, 0);
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+ /* reopen the file with append to the end */
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+ fd = open(filename, O_WRONLY | O_CREAT | O_APPEND, 0);
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if (fd < 0)
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{
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rt_kprintf("open file for append write failed\n");
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- return;
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+ goto __exit;;
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}
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- length = write(fd, test_data, sizeof(test_data));
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- if (length != sizeof(test_data))
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+ length = write(fd, test_data, block_size);
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+ if (length != block_size)
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{
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rt_kprintf("append write data failed\n");
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close(fd);
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- return;
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+ goto __exit;
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}
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- /* 关闭文件 */
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+ /* close the file */
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close(fd);
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- /* 只读打开进行数据校验 */
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- fd = open(TEST_FN, O_RDONLY, 0);
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+ /* open the file for data validation. */
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+ fd = open(filename, O_RDONLY, 0);
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if (fd < 0)
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{
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rt_kprintf("check: open file for read failed\n");
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- return;
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+ goto __exit;
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}
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- /* 读取数据(应该为第一次写入的数据) */
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- length = read(fd, buffer, sizeof(buffer));
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- if (length != sizeof(buffer))
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+ /* read the data (should be the data written by the first time ) */
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+ length = read(fd, buffer, block_size);
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+ if (length != block_size)
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{
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rt_kprintf("check: read file failed\n");
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close(fd);
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- return;
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+ goto __exit;
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}
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- /* 检查数据是否正确 */
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- for (index = 0; index < sizeof(test_data); index ++)
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+ /* validate */
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+ for (index = 0; index < block_size; index ++)
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{
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if (test_data[index] != buffer[index])
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{
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rt_kprintf("check: check data failed at %d\n", index);
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close(fd);
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- return;
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+ goto __exit;
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}
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}
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- /* 读取数据(应该为第二次写入的数据) */
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- length = read(fd, buffer, sizeof(buffer));
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- if (length != sizeof(buffer))
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+ /* read the data (should be the second time data) */
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+ length = read(fd, buffer, block_size);
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+ if (length != block_size)
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{
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rt_kprintf("check: read file failed\n");
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close(fd);
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- return;
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+ goto __exit;
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}
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- /* 检查数据是否正确 */
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- for (index = 0; index < sizeof(test_data); index ++)
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+ /* validate */
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+ for (index = 0; index < block_size; index ++)
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{
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if (test_data[index] != buffer[index])
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{
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rt_kprintf("check: check data failed at %d\n", index);
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close(fd);
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- return;
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+ goto __exit;
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}
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}
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- /* 检查数据完毕,关闭文件 */
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+ /* close the file */
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close(fd);
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- /* 打印结果 */
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- rt_kprintf("read/write done.\n");
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+ /* print result */
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+ rt_kprintf("read/write test successful!\n");
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+
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+__exit:
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+ rt_free(test_data);
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+ rt_free(buffer);
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}
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#ifdef RT_USING_FINSH
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#include <finsh.h>
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-/* 输出函数到finsh shell命令行中 */
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+/* export to finsh */
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FINSH_FUNCTION_EXPORT(readwrite, perform file read and write test);
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-#endif
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+
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+#ifdef FINSH_USING_MSH
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+static void cmd_readwrite(int argc, char *argv[])
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+{
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+ char* filename;
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+
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+ if(argc == 2)
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+ {
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+ filename = argv[1];
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+ }
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+ else
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+ {
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+ rt_kprintf("Usage: readwrite [file_path]\n");
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+ return;
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+ }
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+ readwrite(filename);
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+}
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+FINSH_FUNCTION_EXPORT_ALIAS(cmd_readwrite, __cmd_readwrite, perform file read and write test);
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+#endif /* FINSH_USING_MSH */
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+#endif /* RT_USING_FINSH */
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