03-25-2014
Where exactly are your difficulties, besides the single char typo? :P
Its a good start.
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LEARN ABOUT DEBIAN
ipsec_rangetosubnet
IPSEC_RANGETOSUBNET(3) 8 Sept 2000 IPSEC_RANGETOSUBNET(3)
NAME
ipsec_rangetosubnet - convert address range to subnet
SYNOPSIS
#include <freeswan.h>
const char *rangetosubnet(const ip_address * start, const ip_address * stop, ip_subnet * dst);
DESCRIPTION
Rangetosubnet accepts two IP addresses which define an address range, from start to stop inclusive, and converts this to a subnet if
possible. The addresses must both be IPv4 or both be IPv6, and the address family of the resulting subnet is the same.
Rangetosubnet returns NULL for success and a pointer to a string-literal error message for failure; see DIAGNOSTICS.
SEE ALSO
ipsec_initsubnet(3), ipsec_ttosubnet(3)
DIAGNOSTICS
Fatal errors in rangetosubnet are: mixed address families; unknown address family; start and stop do not define a subnet.
HISTORY
Written for the FreeS/WAN project by Henry Spencer.
BUGS
The restriction of error reports to literal strings (so that callers don't need to worry about freeing them or copying them) does limit the
precision of error reporting.
The error-reporting convention lends itself to slightly obscure code, because many readers will not think of NULL as signifying success. A
good way to make it clearer is to write something like:
const char *error;
error = rangetosubnet( /* ... */ );
if (error != NULL) {
/* something went wrong */
8 Sept 2000 11/14/2008 IPSEC_RANGETOSUBNET(3)