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Right now, we have two sets of "common" code, one containing
general common code and one containing network common code. As we
intend to get rid of the network subdirectory and instead merge
all examples into a single standalone executable, this
distinction doesn't make a lot of sense now. Furthermore, the
common network code is not that big.
Let's get rid of the common network code by merging it into the
general common code.
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The getline(3) function call is not part of ISO C and, most importantly,
it is not implemented on Microsoft Windows platforms. As our networking
example code makes use of getline, this breaks builds on MSVC and MinGW.
As this code wasn't built prior to the previous commit, this was never
noticed.
Fix the error by instead implementing a `readline` function, which
simply reads the password from stdin until it reads a newline
character.
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The credentials callback reads the username and password via scanf into
fixed-length arrays. While these are simply examples and as such not as
interesting, the unchecked return value of scanf causes GCC to emit
warnings. So while we're busy to shut up GCC, we also fix the possible
overflow of scanf by using getline instead.
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