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[dhcp] Allow use of custom reallocation functions for DHCP option blocks

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Allow functions other than realloc() to be used to reallocate DHCP
option block data, and specify the reallocation function at the time
of calling dhcpopt_init().

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2011-01-10 23:58:11 +00:00
parent 310d46c1ed
commit 17b6a3c506
4 changed files with 74 additions and 62 deletions
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15
src/include/ipxe/dhcpopts.h
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@@ -19,16 +19,23 @@ struct dhcp_options {
size_t used_len;
/** Option block allocated length */
size_t alloc_len;
/** Reallocate option block raw data
*
* @v options DHCP option block
* @v len New length
* @ret rc Return status code
*/
int ( * realloc ) ( struct dhcp_options *options, size_t len );
};
extern int dhcpopt_store ( struct dhcp_options *options, unsigned int tag,
const void *data, size_t len );
extern int dhcpopt_extensible_store ( struct dhcp_options *options,
unsigned int tag,
const void *data, size_t len );
extern int dhcpopt_fetch ( struct dhcp_options *options, unsigned int tag,
void *data, size_t len );
extern void dhcpopt_init ( struct dhcp_options *options,
void *data, size_t alloc_len );
void *data, size_t alloc_len,
int ( * realloc ) ( struct dhcp_options *options,
size_t len ) );
extern int dhcpopt_no_realloc ( struct dhcp_options *options, size_t len );
#endif /* _IPXE_DHCPOPTS_H */