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authorErlang/OTP <[email protected]>2019-04-24 15:05:50 +0200
committerErlang/OTP <[email protected]>2019-04-24 15:05:50 +0200
commit6382808213640ea67514f7919668701d5dd2ee7d (patch)
tree9043dc669b45f0f1f355c52445889d501665b62f /lib/ssh/src/ssh_dbg.erl
parent98669a56d4cacf5bf6c7413d264dc50289f84bb9 (diff)
parent167892981042f4a5eb4ac76a1e5a532d5ce65b65 (diff)
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Merge branch 'hans/ssh/hex_dump_info/OTP-15772' into maint-21
* hans/ssh/hex_dump_info/OTP-15772: ssh: Dump 64 bytes in case of unexpected info line ssh: Add hexdump utility in ssh_dbg
Diffstat (limited to 'lib/ssh/src/ssh_dbg.erl')
-rw-r--r--lib/ssh/src/ssh_dbg.erl73
1 files changed, 73 insertions, 0 deletions
diff --git a/lib/ssh/src/ssh_dbg.erl b/lib/ssh/src/ssh_dbg.erl
index 4fe15b24d3..43ac4c0ccf 100644
--- a/lib/ssh/src/ssh_dbg.erl
+++ b/lib/ssh/src/ssh_dbg.erl
@@ -60,6 +60,7 @@
cbuf_stop_clear/0,
cbuf_in/1,
cbuf_list/0,
+ hex_dump/1, hex_dump/2,
fmt_cbuf_items/0, fmt_cbuf_item/1
]).
@@ -439,3 +440,75 @@ fmt_value(#circ_buf_entry{module = M,
io_lib:format("~p:~p ~p/~p ~p~n~s",[M,L,F,A,Pid,fmt_value(V)]);
fmt_value(Value) ->
io_lib:format("~p",[Value]).
+
+%%%================================================================
+
+-record(h, {max_bytes = 65536,
+ bytes_per_line = 16,
+ address_len = 4
+ }).
+
+
+hex_dump(Data) -> hex_dump1(Data, hd_opts([])).
+
+hex_dump(X, Max) when is_integer(Max) ->
+ hex_dump(X, [{max_bytes,Max}]);
+hex_dump(X, OptList) when is_list(OptList) ->
+ hex_dump1(X, hd_opts(OptList)).
+
+hex_dump1(B, Opts) when is_binary(B) -> hex_dump1(binary_to_list(B), Opts);
+hex_dump1(L, Opts) when is_list(L), length(L) > Opts#h.max_bytes ->
+ io_lib:format("~s---- skip ~w bytes----~n", [hex_dump1(lists:sublist(L,Opts#h.max_bytes), Opts),
+ length(L) - Opts#h.max_bytes
+ ]);
+hex_dump1(L, Opts0) when is_list(L) ->
+ Opts = Opts0#h{address_len = num_hex_digits(Opts0#h.max_bytes)},
+ Result = hex_dump(L, [{0,[],[]}], Opts),
+ [io_lib:format("~*.s | ~*s | ~s~n"
+ "~*.c-+-~*c-+-~*c~n",
+ [Opts#h.address_len, lists:sublist("Address",Opts#h.address_len),
+ -3*Opts#h.bytes_per_line, lists:sublist("Hexdump",3*Opts#h.bytes_per_line),
+ "ASCII",
+ Opts#h.address_len, $-,
+ 3*Opts#h.bytes_per_line, $-,
+ Opts#h.bytes_per_line, $-
+ ]) |
+ [io_lib:format("~*.16.0b | ~s~*c | ~s~n",[Opts#h.address_len, N*Opts#h.bytes_per_line,
+ lists:reverse(Hexs),
+ 3*(Opts#h.bytes_per_line-length(Hexs)), $ ,
+ lists:reverse(Chars)])
+ || {N,Hexs,Chars} <- lists:reverse(Result)
+ ]
+ ].
+
+
+hd_opts(L) -> lists:foldl(fun hd_opt/2, #h{}, L).
+
+hd_opt({max_bytes,M}, O) -> O#h{max_bytes=M};
+hd_opt({bytes_per_line,M}, O) -> O#h{bytes_per_line=M}.
+
+
+num_hex_digits(N) when N<16 -> 1;
+num_hex_digits(N) -> trunc(math:ceil(math:log2(N)/4)).
+
+
+hex_dump([L|Cs], Result0, Opts) when is_list(L) ->
+ Result = hex_dump(L,Result0, Opts),
+ hex_dump(Cs, Result, Opts);
+
+hex_dump(Cs, [{N0,_,Chars}|_]=Lines, Opts) when length(Chars) == Opts#h.bytes_per_line ->
+ hex_dump(Cs, [{N0+1,[],[]}|Lines], Opts);
+
+hex_dump([C|Cs], [{N,Hexs,Chars}|Lines], Opts) ->
+ Asc = if
+ 16#20 =< C,C =< 16#7E -> C;
+ true -> $.
+ end,
+ Hex = io_lib:format("~2.16.0b ", [C]),
+ hex_dump(Cs, [{N, [Hex|Hexs], [Asc|Chars]} | Lines], Opts);
+
+hex_dump([], Result, _) ->
+ Result.
+
+
+