[Crash-utility] [PATCH] Add -C option for search

[zhangyanfei]

Hello Dave,

I add a new option -C for sub-command search to display memory contents
just before and after the search target.  The number of the memory unit
displayed is specified by -C.

for example,
crash> search -p -C 3 dddd
17b5100: dddddddddddddddd dddddddddddddddd dddddddddddddddd
17b5118: dddd cdcdcdcdcdcdcdcd cdcdcdcdcdcdcdcd
17b5130: cdcdcdcdcdcdcdcd
--
85d04f818: 29 ffff88085d04f818 ffffea001d3f7e30
85d04f830: dddd 1000 ffff88085b48a000
85d04f848: ffff880876383b80
--
8752cfec8: ddd9 dddb dddb
8752cfee0: dddd dddd dddf
8752cfef8: dddf
--
8752cfed0: dddb dddb dddd
8752cfee8: dddd dddf dddf
8752cff00: dde1
--
crash>


Thanks.
Zhang Yanfei
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