diff options
Diffstat (limited to 'examples/file/readwrite.c')
| -rw-r--r-- | examples/file/readwrite.c | 91 |
1 files changed, 89 insertions, 2 deletions
diff --git a/examples/file/readwrite.c b/examples/file/readwrite.c index b4086cf056..8dc29837ef 100644 --- a/examples/file/readwrite.c +++ b/examples/file/readwrite.c @@ -14,18 +14,105 @@ #include <rtthread.h>
#include <dfs_posix.h>
+#define TEST_FN "/test.dat"
+
+static char test_data[120], buffer[120];
+
/* �ļ���д���� */
void readwrite(const char* filename)
{
int fd;
+ int index, length;
+
+ /* ֻд & ���� �� */
+ fd = open(TEST_FN, O_WRONLY | O_CREAT | O_TRUNC, 0);
+ if (fd < 0)
+ {
+ rt_kprintf("open file for write failed\n");
+ return;
+ }
+
+ /* ������� */
+ for (index = 0; index < sizeof(test_data); index ++)
+ {
+ test_data[index] = index + 27;
+ }
- /* ֻд�� */
+ /* ����� */
+ length = write(fd, test_data, sizeof(test_data));
+ if (length != sizeof(test_data))
+ {
+ rt_kprintf("write data failed\n");
+ close(fd);
+ return;
+ }
+
+ /* �ر��ļ� */
+ close(fd);
/* ֻд����ĩβ���Ӵ� */
+ 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;
+ }
+ /* �ر��ļ� */
+ close(fd);
/* ֻ����������У�� */
+ fd = open(TEST_FN, O_RDONLY, 0);
+ if (fd < 0)
+ {
+ rt_kprintf("check: open file for read failed\n");
+ 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;
+ }
+ }
- /* lseek���ԣ�������У������ */
+ 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;
+ }
+ }
+ /* ���������ϣ��ر��ļ� */
+ close(fd);
+ /* ��ӡ��� */
+ rt_kprintf("read/write done.\n");
}
#ifdef RT_USING_FINSH
|