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-rw-r--r--lib/stdlib/src/io_lib_format.erl22
-rw-r--r--lib/stdlib/test/io_SUITE.erl11
2 files changed, 29 insertions, 4 deletions
diff --git a/lib/stdlib/src/io_lib_format.erl b/lib/stdlib/src/io_lib_format.erl
index 6a06d9448b..64d19ccf48 100644
--- a/lib/stdlib/src/io_lib_format.erl
+++ b/lib/stdlib/src/io_lib_format.erl
@@ -185,8 +185,7 @@ control($s, [L0], F, Adj, P, Pad, latin1, _I) ->
L = iolist_to_chars(L0),
string(L, F, Adj, P, Pad);
control($s, [L0], F, Adj, P, Pad, unicode, _I) ->
- L = unicode:characters_to_list(L0),
- true = is_list(L),
+ L = cdata_to_chars(L0),
uniconv(string(L, F, Adj, P, Pad));
control($e, [A], F, Adj, P, Pad, _Enc, _I) when is_float(A) ->
fwrite_e(A, F, Adj, P, Pad);
@@ -558,6 +557,25 @@ iolist_to_chars([]) ->
iolist_to_chars(B) when is_binary(B) ->
binary_to_list(B).
+%% cdata() :: clist() | cbinary()
+%% clist() :: maybe_improper_list(char() | cbinary() | clist(),
+%% cbinary() | nil())
+%% cbinary() :: unicode:unicode_binary() | unicode:latin1_binary()
+
+%% cdata_to_chars(cdata()) -> io_lib:deep_char_list()
+
+cdata_to_chars([C|Cs]) when is_integer(C), C >= $\000 ->
+ [C | cdata_to_chars(Cs)];
+cdata_to_chars([I|Cs]) ->
+ [cdata_to_chars(I) | cdata_to_chars(Cs)];
+cdata_to_chars([]) ->
+ [];
+cdata_to_chars(B) when is_binary(B) ->
+ case catch unicode:characters_to_list(B) of
+ L when is_list(L) -> L;
+ _ -> binary_to_list(B)
+ end.
+
%% string(String, Field, Adjust, Precision, PadChar)
string(S, none, _Adj, none, _Pad) -> S;
diff --git a/lib/stdlib/test/io_SUITE.erl b/lib/stdlib/test/io_SUITE.erl
index 05009fa570..65a112c966 100644
--- a/lib/stdlib/test/io_SUITE.erl
+++ b/lib/stdlib/test/io_SUITE.erl
@@ -29,7 +29,7 @@
manpage/1, otp_6708/1, otp_7084/1, otp_7421/1,
io_lib_collect_line_3_wb/1, cr_whitespace_in_string/1,
io_fread_newlines/1, otp_8989/1, io_lib_fread_literal/1,
- io_lib_print_binary_depth_one/1, otp_10302/1]).
+ io_lib_print_binary_depth_one/1, otp_10302/1, otp_10836/1]).
%-define(debug, true).
@@ -65,7 +65,7 @@ all() ->
manpage, otp_6708, otp_7084, otp_7421,
io_lib_collect_line_3_wb, cr_whitespace_in_string,
io_fread_newlines, otp_8989, io_lib_fread_literal,
- io_lib_print_binary_depth_one, otp_10302].
+ io_lib_print_binary_depth_one, otp_10302, otp_10836].
groups() ->
[].
@@ -2078,3 +2078,10 @@ pretty(Term, Opts) when is_list(Opts) ->
is_latin1(S) ->
S >= 0 andalso S =< 255.
+
+otp_10836(doc) ->
+ "OTP-10836. ~ts extended to latin1";
+otp_10836(Suite) when is_list(Suite) ->
+ S = io_lib:format("~ts", [[<<"äpple"/utf8>>, <<"äpple">>]]),
+ "äppleäpple" = lists:flatten(S),
+ ok.