Just abuse tftp_read to step forward.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
---
fs/tftp.c | 25 +++++++++++++++++++++++--
1 file changed, 23 insertions(+), 2 deletions(-)
diff --git a/fs/tftp.c b/fs/tftp.c
index 56d4365d773a..272a7106eb51 100644
--- a/fs/tftp.c
+++ b/fs/tftp.c
@@ -591,8 +591,29 @@ static int tftp_read(struct device_d *dev, FILE *f, void *buf, size_t insize)
static loff_t tftp_lseek(struct device_d *dev, FILE *f, loff_t pos)
{
- /* not implemented in tftp protocol */
- return -ENOSYS;
+ if (pos >= f->pos) {
+ char buf[1024];
+ int ret;
+ while (pos > f->pos) {
+ size_t len = min(sizeof(buf), (size_t)(pos - f->pos));
+ ret = tftp_read(dev, f, buf, len);
+
+ if (ret < 0)
+ return ret;
+ else if (!ret)
+ return -EINVAL;
+ f->pos += ret;
+
+ memory_display(buf, f->pos - len, 0x10, 4, 0);
+ }
+ return pos;
+ } else {
+ /*
+ * We cannot seek backwards without reloading or caching the
+ * file
+ */
+ return -ENOSYS;
+ }
}
static DIR* tftp_opendir(struct device_d *dev, const char *pathname)
--
2.11.0
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