Lucian Copeland

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5 years, 11 months ago.

Adding SD card truncate support through the API

Hello all,

I'm attempting to follow a similar path to this topic: https://github.com/ARMmbed/mbed-os/issues/7010

However, I'm working in MBED 2, rather than the OS, so my process is giving me considerably more trouble.

I have added the appropriate truncate() function to FATFileHandle, and the virtual functions to FileHandle:

virtual ssize_t truncate();

and LocalFileSystem:

virtual ssize_t truncate() = 0;

However, now it's screwing with the Stream class, which manifests as a problem with a totally unrelated library. And I can't seem to fix this issue: if I add the corresponding virtual function to the Stream class, it starts to give me a "… undefined reference to … collect2: ld returned 1 exit status" linker error. If I don't, it makes the whole library class that calls stream virtual and it fails.

Has anyone added functionality through the MBED API before who could help me navigate this?

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