File 1401-io_proto_SUITE-Use-rand-instead-of-random.patch of Package erlang

From eb7e620b4628d8c670b623cc5ee3e2909feb22f9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Mon, 21 Mar 2022 06:44:17 +0100
Subject: [PATCH 1/2] io_proto_SUITE: Use rand instead of random

---
 lib/stdlib/test/io_proto_SUITE.erl | 41 ++++++++++++++++++------------
 1 file changed, 25 insertions(+), 16 deletions(-)

diff --git a/lib/stdlib/test/io_proto_SUITE.erl b/lib/stdlib/test/io_proto_SUITE.erl
index 52ed5c608f..525b479fef 100644
--- a/lib/stdlib/test/io_proto_SUITE.erl
+++ b/lib/stdlib/test/io_proto_SUITE.erl
@@ -460,7 +460,8 @@ unicode_options(Config) when is_list(Config) ->
 %% Tests various unicode options on random generated files.
 unicode_options_gen(Config) when is_list(Config) ->
     ct:timetrap({minutes,30}), %% valgrind needs a alot of time
-    random:seed(1240, 900586, 553728),
+    rand:seed(default),
+    io:format("*** SEED: ~p ***\n", [rand:export_seed()]),
     PrivDir = proplists:get_value(priv_dir, Config),
     AllModes = [utf8,utf16,{utf16,big},{utf16,little},
 		utf32,{utf32,big},{utf32,little}],
@@ -513,12 +514,11 @@ unicode_options_gen(Config) when is_list(Config) ->
 				       [read,read_ahead,{encoding,Encoding}],
 				       Read4),
 
-		Ulist2 = [X || X <- Ulist, X =/= $\n, X =/= $\s],
-		Ulist3 = [X || X <- Ulist, X =/= $\n],
+		Ulist2 = [X || X <- Ulist, X =/= $\n, X =/= $\s, X =/= $\t],
 		Ulist = done(Res1),
 		Ulist = done(Res2),
 		Ulist2 = done(Res3),
-		Ulist3 = done(Res4),
+		Ulist2 = done(Res4),
 
 		file:delete(Fname)
 	end,
@@ -635,22 +635,31 @@ enc2str({A1,A2}) when is_atom(A1), is_atom(A2) ->
 
 
 random_unicode(0) ->
-    [];
+    %% io:fread(Device, Promp, "~ts") will return an error if the file
+    %% ends with whitespace characters. This behavior seems to be
+    %% deliberate. Therefore, be sure that we never end the file with
+    %% a sequence of whitespace characters.
+    [$! + rand:uniform(64) |
+     case rand:uniform(20) of
+         A when A =< 1 -> [$\n];
+         _ -> []
+     end];
 random_unicode(N) ->
-    %% Favour large unicode and make linebreaks
-    X = case random:uniform(20) of
+    %% Favor large unicode code points and make line breaks.
+    X = case rand:uniform(20) of
 	    A when A =< 1 -> $\n;
-	    A0 when A0 =< 3 -> random:uniform(16#10FFFF);
-	    A1 when A1 =< 6 -> random:uniform(16#10FFFF - 16#7F) + 16#7F;
-	    A2 when A2 =< 12 -> random:uniform(16#10FFFF - 16#7FF) + 16#7FF;
-	    _ -> random:uniform(16#10FFFF - 16#FFFF) + 16#FFFF
+	    A when A =< 3 -> rand:uniform(16#10FFFF);
+	    A when A =< 6 -> rand:uniform(16#10FFFF - 16#7F) + 16#7F;
+	    A when A =< 12 -> rand:uniform(16#10FFFF - 16#7FF) + 16#7FF;
+	    _ -> rand:uniform(16#10FFFF - 16#FFFF) + 16#FFFF
 	end,
-    case X of
-	Inv1 when Inv1 >= 16#D800, Inv1 =< 16#DFFF;
-	          Inv1 =:= 16#FFFE; 
-	          Inv1 =:= 16#FFFF ->
+    if
+        X =:= $\r;                            %Can be eaten by io:get_line/2.
+        16#D800 =< X, X =< 16#DFFF;
+        X =:= 16#FFFE;
+        X =:= 16#FFFF ->
 	    random_unicode(N);
-	_ ->
+	true ->
 	    [X | random_unicode(N-1)]
     end.
 
-- 
2.34.1