HEX format is friendly to iSCSI utils, for example: ./iscsi-inq -e 0x1 -c 0xb1 iscsi://... atoi supports decimal only, this example does not work. Use strtol(nptr, NULL, 0) to auto-detect format, then this works fine. Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>