Use getopt_long instead of custom arg parsing One side affect of this change is we no longer copy the filename args into malloc'ed buffers, we just use const char pointers. This also fixes how we recognize filename extensions, to ensure that the filename really ends with the extension (i.e. .bin, not .binary). BUG=chromium-os:21568 TEST=builds clean; Test following cases: cyapa_fw_update cyapa_fw_update -h cyapa_fw_update -v cyapa_fw_update -f cyapa_fw_update -f -b cyapa_fw_update -b -o bkup.bin cyapa_fw_update -b -o bkup cyapa_fw_update -f fw.iic cyapa_fw_update -f -b fw.binary Change-Id: I48c2f686e2118e8b1ca91a54e87ee29c80f37b2e
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