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-.TH IPSEC_GOODMASK 3 "11 June 2001"
-.SH NAME
-ipsec goodmask \- is this Internet subnet mask a valid one?
-.br
-ipsec masktobits \- convert Internet subnet mask to bit count
-.br
-ipsec bitstomask \- convert bit count to Internet subnet mask
-.SH SYNOPSIS
-.B "#include <freeswan.h>
-.sp
-.B "int goodmask(struct in_addr mask);"
-.br
-.B "int masktobits(struct in_addr mask);"
-.br
-.B "struct in_addr bitstomask(int n);"
-.SH DESCRIPTION
-These functions are obsolete;
-see
-.IR ipsec_masktocount (3)
-for a partial replacement.
-.PP
-.I Goodmask
-reports whether the subnet
-.I mask
-is a valid one,
-i.e. consists of a (possibly empty) sequence of
-.BR 1 s
-followed by a (possibly empty) sequence of
-.BR 0 s.
-.I Masktobits
-takes a (valid) subnet mask and returns the number of
-.B 1
-bits in it.
-.I Bitstomask
-reverses this,
-returning the subnet mask corresponding to bit count
-.IR n .
-.PP
-All masks are in network byte order.
-.SH SEE ALSO
-inet(3), ipsec_atosubnet(3)
-.SH DIAGNOSTICS
-.I Masktobits
-returns
-.B \-1
-for an invalid mask.
-.I Bitstomask
-returns an all-zeros mask for a negative or out-of-range
-.IR n .
-.SH HISTORY
-Written for the FreeS/WAN project by Henry Spencer.
-.SH BUGS
-The error-reporting convention of
-.I bitstomask
-is less than ideal;
-zero is sometimes a legitimate mask.