fopen(filepath, "rb") doesn't seem to work

[justbuchanan]

Whenever I try to open a file in binary mode, fopen() returns nullptr, but errno is set to 0. I have verified that the file I'm opening exists and it opens just fine in text mode when I pass "r" instead of "rb".

[adamgreen]

Don't use the 'b' (binary) option with mbed. Some of the mbed supported Standard C Libraries just strip it off and others pass it down to lower level file system drivers which then fail on it. I have never seen any evidence that a mbed supported C Library will actually treat 'text' files any different than 'binary' ones just like most Posix systems.

[justbuchanan]

Ok, makes sense. I'll just stick with "r" for the mode. Thanks!

[adamgreen]

@justbuchanan Which toolchain and FileSystem did you hit this with? I have seen it before with GCC/newlib and LocalFileSystem. Is that what you were attempting to use as well?

[justbuchanan]

@adamgreen, yeah this was with GCC and LocalFileSystem on an MBED LPC1768.

[adamgreen]

Thanks for the info. I think I have a fix that will stop that from happening. I am planning to do some file system related PRs over the next couple of weeks. I will add this to my list.