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-rw-r--r--lib/stdlib/src/io.erl7
-rw-r--r--lib/stdlib/src/io_lib.erl48
2 files changed, 40 insertions, 15 deletions
diff --git a/lib/stdlib/src/io.erl b/lib/stdlib/src/io.erl
index 3dddb0d6e7..c92e9e3ade 100644
--- a/lib/stdlib/src/io.erl
+++ b/lib/stdlib/src/io.erl
@@ -32,6 +32,8 @@
parse_erl_exprs/4,parse_erl_form/1,parse_erl_form/2,
parse_erl_form/3,parse_erl_form/4]).
-export([request/1,request/2,requests/1,requests/2]).
+%% Implemented in native code
+-export([printable_range/0]).
-export_type([device/0, format/0, server_no_data/0]).
@@ -66,6 +68,11 @@ o_request(Io, Request, Func) ->
Other
end.
+%% Request what the user considers printable characters
+-spec printable_range() -> 'unicode' | 'latin1'.
+printable_range() ->
+ erlang:nif_error(undefined).
+
%% Put chars takes mixed *unicode* list from R13 onwards.
-spec put_chars(CharData) -> 'ok' when
CharData :: unicode:chardata().
diff --git a/lib/stdlib/src/io_lib.erl b/lib/stdlib/src/io_lib.erl
index b7ec848e1e..ff389cbe22 100644
--- a/lib/stdlib/src/io_lib.erl
+++ b/lib/stdlib/src/io_lib.erl
@@ -72,7 +72,7 @@
-export([quote_atom/2, char_list/1, latin1_char_list/1,
deep_char_list/1, deep_latin1_char_list/1,
- printable_list/1, printable_latin1_list/1]).
+ printable_list/1, printable_latin1_list/1, printable_unicode_list/1]).
%% Utilities for collecting characters.
-export([collect_chars/3, collect_chars/4,
@@ -533,27 +533,45 @@ printable_latin1_list(_) -> false. %Everything else is false
%% Return true if CharList is a list of printable characters, else
%% false. The notion of printable in Unicode terms is somewhat floating.
%% Everything that is not a control character and not invalid unicode
-%% will be considered printable.
+%% will be considered printable.
+%% What the user has noted as printable characters is what actually
+%% specifies when this function will return true. If the VM is started
+%% with +pc latin1, only the latin1 range will be deemed as printable
+%% if on the other hand +pc unicode is given, all characters in the Unicode
+%% character set are deemed printable. latin1 is default.
-spec printable_list(Term) -> boolean() when
Term :: term().
-printable_list([C|Cs]) when is_integer(C), C >= $\040, C =< $\176 ->
- printable_list(Cs);
-printable_list([C|Cs])
+printable_list(L) ->
+ %% There will be more alternatives returns from io:printable range
+ %% in the future. To not have a catch-all caluse is deliberate.
+ case io:printable_range() of
+ latin1 ->
+ printable_latin1_list(L);
+ unicode ->
+ printable_unicode_list(L)
+ end.
+
+-spec printable_unicode_list(Term) -> boolean() when
+ Term :: term().
+
+printable_unicode_list([C|Cs]) when is_integer(C), C >= $\040, C =< $\176 ->
+ printable_unicode_list(Cs);
+printable_unicode_list([C|Cs])
when is_integer(C), C >= 16#A0, C < 16#D800;
is_integer(C), C > 16#DFFF, C < 16#FFFE;
is_integer(C), C > 16#FFFF, C =< 16#10FFFF ->
- printable_list(Cs);
-printable_list([$\n|Cs]) -> printable_list(Cs);
-printable_list([$\r|Cs]) -> printable_list(Cs);
-printable_list([$\t|Cs]) -> printable_list(Cs);
-printable_list([$\v|Cs]) -> printable_list(Cs);
-printable_list([$\b|Cs]) -> printable_list(Cs);
-printable_list([$\f|Cs]) -> printable_list(Cs);
-printable_list([$\e|Cs]) -> printable_list(Cs);
-printable_list([]) -> true;
-printable_list(_) -> false. %Everything else is false
+ printable_unicode_list(Cs);
+printable_unicode_list([$\n|Cs]) -> printable_unicode_list(Cs);
+printable_unicode_list([$\r|Cs]) -> printable_unicode_list(Cs);
+printable_unicode_list([$\t|Cs]) -> printable_unicode_list(Cs);
+printable_unicode_list([$\v|Cs]) -> printable_unicode_list(Cs);
+printable_unicode_list([$\b|Cs]) -> printable_unicode_list(Cs);
+printable_unicode_list([$\f|Cs]) -> printable_unicode_list(Cs);
+printable_unicode_list([$\e|Cs]) -> printable_unicode_list(Cs);
+printable_unicode_list([]) -> true;
+printable_unicode_list(_) -> false. %Everything else is false
%% List = nl()
%% Return a list of characters to generate a newline.