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net: sync CIDRMask code, doc

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R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4961069
This commit is contained in:
Russ Cox 2011-09-07 15:50:07 -04:00
parent aed2c06dcb
commit ef01ebf403
1 changed files with 3 additions and 2 deletions
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5
src/pkg/net/ip.go
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@ -65,8 +65,9 @@ func IPv4Mask(a, b, c, d byte) IPMask {
return p return p
} }
// CIDRMask returns an IPMask of size bits with the first n bits // CIDRMask returns an IPMask consisting of `ones' 1 bits
// set to to 1. nil is returned if the mask is impossible. // followed by 0s up to a total length of `bits' bits.
// For a mask of this form, CIDRMask is the inverse of IPMask.Size.
func CIDRMask(ones, bits int) IPMask { func CIDRMask(ones, bits int) IPMask {
if bits != 8*IPv4len && bits != 8*IPv6len { if bits != 8*IPv4len && bits != 8*IPv6len {
return nil return nil