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Fix pbuf_chain() to update tot_len of last buffer in first chain properly.

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Previous code skipped it.

Made comments in pbuf_header() more general (header can be increased or
decreased).
This commit is contained in:
davidhaas 2003-03-31 20:45:08 +00:00
parent 6da25968e0
commit 9f3511231a
1 changed files with 10 additions and 3 deletions
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13
src/core/pbuf.c
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@ -486,14 +486,18 @@ pbuf_realloc(struct pbuf *p, u16_t new_len)
}
/**
* Tries to expand the payload with towards the front.
* Adjusts the payload pointer +/- for header.
*
* Adjusts the ->payload pointer so that space for a header appears in
* the pbuf. Also, the ->tot_len and ->len fields are adjusted.
*
* @param hdr_decrement Number of bytes to decrement header size.
* (Using a negative value increases the header size.)
* @param hdr_size Number of bytes to increment header size which
* increases the size of the pbuf. New space is on the front.
* (Using a negative value decreases the header size.)
*
* PBUF_ROM and PBUF_REF type buffers cannot have their sizes increased, so
* the call will fail. A check is made that the increase in header size does
* not move the payload pointer in front of the start of the buffer.
* @return 1 on failure, 0 on success.
*/
u8_t
@ -710,6 +714,9 @@ pbuf_chain(struct pbuf *h, struct pbuf *t)
/* add total length of second chain to all totals of first chain */
p->tot_len += t->tot_len;
}
/* add total length of second chain to last buffer tot_len in first chain */
p->tot_len += t->tot_len;
/* chain last pbuf of h chain (p) with first of tail (t) */
p->next = t;
/* t is now referenced to one more time */