Unexpected behavior with ucp

[iandulchinos-cpi]

Using uuu version 1.5.21, but the issue exists on 1.4.139 as well. Haven't tried any other versions.

Copying a file and then copying again with a truncated version of the same file results in extra characters added to the resulting file on the device.

Steps to reproduce

On the PC running uuu, with the device in FBK mode, run

$ echo abcd > /tmp/test.txt
$ uuu FBK: ucp /tmp/test.txt T:/tmp/test.txt
$ echo ab > /tmp/test.txt
$ uuu FBK: ucp /tmp/test.txt T:/tmp/test.txt

Expected contents of /tmp/test.txt on the device:

ab

Actual contents of /tmp/test.txt on the device:

ab
d

Is this a known issue?

[nxpfrankli]

Possible it is bugs.

Can you try

diff --git a/libuuu/buffer.cpp b/libuuu/buffer.cpp
index 7e32a06..0500d6e 100644
--- a/libuuu/buffer.cpp
+++ b/libuuu/buffer.cpp
@@ -239,7 +239,7 @@ public:
                if (p->mapfile(backfile.substr(1), st.st_size))
                        return -1;

-               p->m_available_size = st.st_size;
+               p->m_DataSize = p->m_available_size = st.st_size;

                atomic_fetch_or(&p->m_dataflags, FILEBUFFER_FLAG_LOADED | FILEBUFFER_FLAG_NEVER_FREE);
                p->m_request_cv.notify_all();

[iandulchinos-cpi]

@nxpfrankli Thank you for the quick response! I added that change on top of the most recent master commit and built, still seeing the issue.