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MINOR: buffers: provide simple pointer normalization functions

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Add buffer_wrap_sub() and buffer_wrap_add() to normalize buffer pointers
after an addition or subtract.
This commit is contained in:
Willy Tarreau 2012-03-02 10:38:01 +01:00
parent 02d6cfc1d7
commit 7fd758bbcf
1 changed files with 16 additions and 0 deletions
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16
include/proto/buffers.h
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@ -87,6 +87,22 @@ static inline int buffer_empty(const struct buffer *buf)
return !buffer_not_empty(buf);
}
/* Normalizes a pointer after a subtract */
static inline char *buffer_wrap_sub(const struct buffer *buf, char *ptr)
{
if (ptr < buf->data)
ptr += buf->size;
return ptr;
}
/* Normalizes a pointer after an addition */
static inline char *buffer_wrap_add(const struct buffer *buf, char *ptr)
{
if (ptr - buf->size >= buf->data)
ptr -= buf->size;
return ptr;
}
/* Return the number of reserved bytes in the buffer, which ensures that once
* all pending data are forwarded, the buffer still has global.tune.maxrewrite
* bytes free. The result is between 0 and global.maxrewrite, which is itself