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I think there is a bug in _VFPRINTF_R (vfprintf.c) in the string case.
Not a bug.
I think if cp equals NULL, cp just should be empty.
Why? POSIX and C99 are both clear - if cp is NULL, your program is invoking undefined behavior. Newlib is allowed to do whatever it wants, including reformat your hard drive. However, for debuggability purposes, we have instead chosen to copy glibc, and print "(null)" to point out your non-compliant program a little more nicely.
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