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Fix two off-by-one errors that would sometimes cause the final length of
the sbuf to include the trailing zero.
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may now be called with an unfinished sbuf.
For consistency, copy the related comment from sbuf_delete() to sbuf_clear()
and sbuf_len().
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Move the helper macros from sbuf.h to sbuf.c
Use ints instead of size_ts.
Relax the requirements for sbuf_finish(): it is now possible to finish an
overflowed buffer.
Make sbuf_len() return -1 instead of 0 if the sbuf overflowed.
Requested by: gibbs
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