[Bug 217815] ifconfig wrap around line not indented

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217815

            Bug ID: 217815
           Summary: ifconfig wrap around line not indented
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: joeb1 at a1poweruser.com

Some network devices have a long list of options and when ifconfig lists them  
 the line wraps around to position one instead of being indented.

An example follows.

/root >ifconfig -a
em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
       
options=4019b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,VLA
N_HWTSO>
        ether d0:50:99:93:75:98
        inet 7x.14x.8x.7x netmask 0xfffffc00 broadcast 255.255.255.255 
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (100baseTX <full-duplex>)
        status: active
vge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
       
options=389b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_UCAST
,WOL_MCAST,WOL_MAGIC>
        ether 10:00:60:21:00:93
        inet 10.0.10.2 netmask 0xff000000 broadcast 10.255.255.255 
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (100baseTX <full-duplex>)
        status: active

Need to change ifconfig to check print line length to see if the content
exceeds the max line size, and if so take the remaining content and print it on
a new indented line so it looks nice.

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