Mark de Wever f0c06c0420 [libc++][format][5/6] Improve format_to_n.
Use a specialized buffer wrapper to limit the number of insertions in the
buffer. After the limit has been reached the buffer only needs to count
the number of insertions to return the buffer size required to store the
entire output.

Depends on D110498

Reviewed By: #libc, Mordante

Differential Revision: https://reviews.llvm.org/D110499
2022-05-18 20:14:32 +02:00
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