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Provide a mechanism for returning the encapsulator as well as the

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encapsulated option; this will be needed for modifications to the options
block.
This commit is contained in:
Michael Brown
2006-06-28 18:59:54 +00:00
parent c9ea710930
commit 51d62d1a3c
2 changed files with 37 additions and 15 deletions
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14
src/include/gpxe/dhcp.h
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@@ -88,6 +88,20 @@ extern unsigned long dhcp_num_option ( struct dhcp_option *option );
extern struct dhcp_option * find_dhcp_option ( unsigned int tag,
struct dhcp_option_block *options );
/**
* Find DHCP numerical option, and return its value
*
* @v tag DHCP option tag to search for
* @v options DHCP options block
* @ret value Numerical value of the option, or 0 if not found
*
* This function exists merely as a notational shorthand for a call to
* find_dhcp_option() followed by a call to dhcp_num_option(). It is
* not possible to distinguish between the cases "option not found"
* and "option has a value of zero" using this function; if this
* matters to you then issue the two constituent calls directly and
* check that find_dhcp_option() returns a non-NULL value.
*/
static inline unsigned long
find_dhcp_num_option ( unsigned int tag, struct dhcp_option_block *options ) {
return dhcp_num_option ( find_dhcp_option ( tag, options ) );