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Add iob_ensure_headroom() placeholder.

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This commit is contained in:
Michael Brown
2007-06-20 01:12:21 +01:00
parent 4f309ff0c7
commit 564ac70a42
1 changed files with 19 additions and 0 deletions
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19
src/include/gpxe/iobuf.h
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@@ -9,6 +9,7 @@
#include <stdint.h> #include <stdint.h>
#include <assert.h> #include <assert.h>
#include <errno.h>
#include <gpxe/list.h> #include <gpxe/list.h>
/** /**
@@ -161,6 +162,24 @@ static inline size_t iob_tailroom ( struct io_buffer *iobuf ) {
return ( iobuf->end - iobuf->tail ); return ( iobuf->end - iobuf->tail );
} }
/**
* Ensure I/O buffer has sufficient headroom
*
* @v iobuf I/O buffer
* @v len Required headroom
*
* This function currently only checks for the required headroom; it
* does not reallocate the I/O buffer if required. If we ever have a
* code path that requires this functionality, it's a fairly trivial
* change to make.
*/
static inline __attribute__ (( always_inline )) int
iob_ensure_headroom ( struct io_buffer *iobuf, size_t len ) {
if ( iob_headroom ( iobuf ) >= len )
return 0;
return -ENOBUFS;
}
extern struct io_buffer * alloc_iob ( size_t len ); extern struct io_buffer * alloc_iob ( size_t len );
extern void free_iob ( struct io_buffer *iobuf ); extern void free_iob ( struct io_buffer *iobuf );
extern void iob_pad ( struct io_buffer *iobuf, size_t min_len ); extern void iob_pad ( struct io_buffer *iobuf, size_t min_len );