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https://github.com/llvm/llvm-project/issues/60481
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This is step 4 of
https://discourse.llvm.org/t/rfc-customizable-namespace-to-allow-testing-the-libc-when-the-system-libc-is-also-llvms-libc/73079
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In a previous patch, the printf writer was rewritten to use a single
writer class with a buffer and a callback hook. This patch refactors
scanf's reader to match conceptually.
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Sometimes the vfprintf test was failing, I suspect that's due to it
using the same filename as the fprintf test. This patch fixes that
problem by changing the filename of the vfprintf output file.
Reviewed By: lntue
Differential Revision: https://reviews.llvm.org/D157523
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The v variants of the printf functions take their variadic arguments as
a va_list instead of as individual arguments. They are otherwise
identical to the corresponding printf variants. This patch adds them
(vprintf, vfprintf, vsprintf, and vsnprintf) as well as tests.
Reviewed By: phosek
Differential Revision: https://reviews.llvm.org/D157138
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