abc/lwip
1
0
Fork 0
mirror of https://git.savannah.nongnu.org/git/lwip.git synced 2026-05-27 02:26:55 +08:00
Code Issues Packages Projects Releases Wiki Activity

Added 'pbuf_alloc_copy' e.g. as a single function for use with non scatter-gather drivers

Browse Source
This commit is contained in:
goldsimon
2017-04-25 10:07:57 +02:00
parent 42eb98c9fc
commit dcb2cb99a1
2 changed files with 28 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
src/core/pbuf.c
View File

@@ -1319,6 +1319,33 @@ pbuf_coalesce(struct pbuf *p, pbuf_layer layer)
return q;
}
/**
* @ingroup pbuf
* Allocates a new pbuf of same length (via @pbuf_alloc) and copies the source
* pbuf into this new pbuf (using @pbuf_copy).
*
* @param layer pbuf_layer of the new pbuf
* @param type this parameter decides how and where the pbuf should be allocated
* (@see pbuf_alloc)
* @param p the source pbuf
*
* @return a new pbuf or NULL if allocation fails
*/
struct pbuf *
pbuf_alloc_copy(pbuf_layer layer, pbuf_type type, struct pbuf *p)
{
struct pbuf *q;
err_t err;
q = pbuf_alloc(layer, p->tot_len, type);
if (q == NULL) {
return NULL;
}
err = pbuf_copy(q, p);
LWIP_UNUSED_ARG(err); /* in case of LWIP_NOASSERT */
LWIP_ASSERT("pbuf_copy failed", err == ERR_OK);
return q;
}
#if LWIP_CHECKSUM_ON_COPY
/**
* Copies data into a single pbuf (*not* into a pbuf queue!) and updates