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update file example.

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git-svn-id: https://rt-thread.googlecode.com/svn/trunk@408 bbd45198-f89e-11dd-88c7-29a3b14d5316
This commit is contained in:
bernard.xiong
2010-02-11 15:59:25 +00:00
parent 2f3882c714
commit 3c831420de
4 changed files with 111 additions and 7 deletions
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examples/file/readwrite.c
+89 -2
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@@ -14,18 +14,105 @@
#include <rtthread.h>
#include <dfs_posix.h>
#define TEST_FN "/test.dat"
static char test_data[120], buffer[120];
/* 文件读写测试 */
void readwrite(const char* filename)
{
int fd;
int index, length;
/* 只写打开 */
/* 只写 & 创建 打开 */
fd = open(TEST_FN, O_WRONLY | O_CREAT | O_TRUNC, 0);
if (fd < 0)
{
rt_kprintf("open file for write failed\n");
return;
}
/* 准备写入数据 */
for (index = 0; index < sizeof(test_data); index ++)
{
test_data[index] = index + 27;
}
/* 写入数据 */
length = write(fd, test_data, sizeof(test_data));
if (length != sizeof(test_data))
{
rt_kprintf("write data failed\n");
close(fd);
return;
}
/* 关闭文件 */
close(fd);
/* 只写并在末尾添加打开 */
fd = open(TEST_FN, O_WRONLY | O_CREAT | O_APPEND, 0);
if (fd < 0)
{
rt_kprintf("open file for append write failed\n");
return;
}
length = write(fd, test_data, sizeof(test_data));
if (length != sizeof(test_data))
{
rt_kprintf("append write data failed\n");
close(fd);
return;
}
/* 关闭文件 */
close(fd);
/* 只读打开进行数据校验 */
fd = open(TEST_FN, O_RDONLY, 0);
if (fd < 0)
{
rt_kprintf("check: open file for read failed\n");
return;
}
/* lseek测试，读出并校验数据 */
length = read(fd, buffer, sizeof(buffer));
if (length != sizeof(buffer))
{
rt_kprintf("check: read file failed\n");
close(fd);
return;
}
for (index = 0; index < sizeof(test_data); index ++)
{
if (test_data[index] != buffer[index])
{
rt_kprintf("check: check data failed at %d\n", index);
close(fd);
return;
}
}
length = read(fd, buffer, sizeof(buffer));
if (length != sizeof(buffer))
{
rt_kprintf("check: read file failed\n");
close(fd);
return;
}
for (index = 0; index < sizeof(test_data); index ++)
{
if (test_data[index] != buffer[index])
{
rt_kprintf("check: check data failed at %d\n", index);
close(fd);
return;
}
}
/* 检查数据完毕，关闭文件 */
close(fd);
/* 打印结果 */
rt_kprintf("read/write done.\n");
}
#ifdef RT_USING_FINSH