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

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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
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27
src/core/pbuf.c
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@ -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

1
src/include/lwip/pbuf.h
View File

@ -262,6 +262,7 @@ err_t pbuf_take(struct pbuf *buf, const void *dataptr, u16_t len);
err_t pbuf_take_at(struct pbuf *buf, const void *dataptr, u16_t len, u16_t offset);
struct pbuf *pbuf_skip(struct pbuf* in, u16_t in_offset, u16_t* out_offset);
struct pbuf *pbuf_coalesce(struct pbuf *p, pbuf_layer layer);
struct pbuf *pbuf_alloc_copy(pbuf_layer l, pbuf_type type, struct pbuf *p);
#if LWIP_CHECKSUM_ON_COPY
err_t pbuf_fill_chksum(struct pbuf *p, u16_t start_offset, const void *dataptr,
u16_t len, u16_t *chksum);