[Crash-utility] Adding a new command rbtree

Hello HATAYAMA, I am trying to add a new command can be used to display rbtree and radix tree. After some investigation, I find they are similar to the build-in command "list". So I send this mail to ask your opinion about making cmd_list to be similar to the command "struct/union/*". Another thing needed to be inquired is about the style of displaying tree. I will list some of my thought, and some suggestion will be glad to get from you. 1. NODE ... : ... NODE ... : ... NODE ... : ... NODE ... : ... NODE ... : ... NODE ... : ... This style can not indicate whether the leaf is left or right. And with a big depth, the output may be ugly. So I do not like it. 2. l - left child r - right child root NODE ... : ... l NODE ... : ... ll NODE ... : ... lll NODE ... : ... lr NODE ... : ... r NODE ... : ... Of course, in radix tree, l & r will be changed to some string that can indicate the child of a node. Still, with a big depth, the line will be too long and ugly. 3. root NODE addr1 : ... addr1 l NODE addr2 : ... addr2 l NODE addr3 : ... addr3 l NODE addr4 : ... addr2 r NODE addr5 : ... addr1 r NODE addr6 : ... (l & r have the same meaning with the one in the 2.) Surely, I prefer the the third one. What do you think? Or eliminating the information indicating position is acceptable? -- -- Regards Qiao Nuohan