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MINOR: buffers: add a rewind function

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b_rew() will be used to rewind a buffer for certain specific operations
such as header inspection on data already in the output queue.
This commit is contained in:
Willy Tarreau 2012-05-18 22:11:27 +02:00
parent be0688c64d
commit 13e66dad26
1 changed files with 13 additions and 0 deletions
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13
include/proto/buffers.h
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@ -303,6 +303,19 @@ static inline void b_adv(struct buffer *b, unsigned int adv)
b->p = b_ptr(b, adv);
}
/* Rewinds the buffer by <adv> bytes, which means that the buffer pointer goes
* backwards, and that as many bytes from out are moved to in. The caller is
* responsible for ensuring that adv is always smaller than or equal to b->o.
*/
static inline void b_rew(struct buffer *b, unsigned int adv)
{
b->i += adv;
b->o -= adv;
if (!b->o && !b->pipe)
b->flags |= BF_OUT_EMPTY;
b->p = b_ptr(b, -adv);
}
/* Return the amount of bytes that can be written into the buffer at once,
* excluding the amount of reserved space passed in <res>, which is
* preserved.