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Printing directly into an stdio stream and hooking up to the flush (the write callback) avoids having to allocate+free a temporary buffer on every printing call. The FILE uses a permanent buffer for storing the text, and once it fills up or a newline is detected, it is flushed out. It is fine to mix the new and the old APIs, since the old API flushes the stream. The buffer size of 3 kB is just a guess. The man-page for fopencookie() recommends setting _FILE_OFFSET_BITS to 64. Even though this patch does not strictly need it (we don't implement seek or take the address of fopencookie()), I think it's good to follow anyway. Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com> |
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