File 2181-Use-rand-bytes-1-for-simplified-data-generation.patch of Package erlang

From 43a21905e5c6c0f89c46a1c83b1cae76828d4249 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Tue, 5 Apr 2022 12:31:00 +0200
Subject: [PATCH] Use rand:bytes/1 for simplified data generation

---
 erts/emulator/test/decode_packet_SUITE.erl |  6 +-----
 erts/emulator/test/distribution_SUITE.erl  | 11 +----------
 erts/emulator/test/driver_SUITE.erl        |  2 +-
 erts/emulator/test/nif_SUITE.erl           |  7 +------
 erts/emulator/test/random_iolist.erl       |  5 +++--
 lib/stdlib/test/random_iolist.erl          |  2 +-
 6 files changed, 8 insertions(+), 25 deletions(-)

diff --git a/erts/emulator/test/decode_packet_SUITE.erl b/erts/emulator/test/decode_packet_SUITE.erl
index bedcaf3a08..891c2ec63f 100644
--- a/erts/emulator/test/decode_packet_SUITE.erl
+++ b/erts/emulator/test/decode_packet_SUITE.erl
@@ -174,11 +174,7 @@ pack(fcgi,Bin) ->
     PaddSz = rand:uniform(16) - 1,
     Psz = byte_size(Bin),
     Reserv = rand:uniform(256) - 1,
-    Padd = case PaddSz of
-               0 -> <<>>;
-               _ -> list_to_binary([rand:uniform(256)-1
-                                    || _<- lists:seq(1,PaddSz)])
-           end,
+    Padd = rand:bytes(PaddSz),
     Res = <<Ver:8,Type:8,Id:16,Psz:16/big,PaddSz:8,Reserv:8,Bin/binary>>,
     {<<Res/binary,Padd/binary>>, Res};
 pack(tpkt,Bin) ->
diff --git a/erts/emulator/test/distribution_SUITE.erl b/erts/emulator/test/distribution_SUITE.erl
index 4538cd870d..8fc0a2afd0 100644
--- a/erts/emulator/test/distribution_SUITE.erl
+++ b/erts/emulator/test/distribution_SUITE.erl
@@ -2712,15 +2712,7 @@ mk_rand_bin_list(Bytes, Binaries) ->
 mk_rand_bin_list(_Bytes, 0, Acc) ->
     Acc;
 mk_rand_bin_list(Bytes, Binaries, Acc) ->
-    mk_rand_bin_list(Bytes, Binaries-1, [mk_rand_bin(Bytes) | Acc]).
-
-mk_rand_bin(Bytes) ->
-    mk_rand_bin(Bytes, []).
-
-mk_rand_bin(0, Data) ->
-    list_to_binary(Data);
-mk_rand_bin(N, Data) ->
-    mk_rand_bin(N-1, [rand:uniform(256) - 1 | Data]).
+    mk_rand_bin_list(Bytes, Binaries-1, [rand:bytes(Bytes) | Acc]).
 
 creation_selection(Config) when is_list(Config) ->
     register(creation_selection_test_supervisor, self()),
diff --git a/erts/emulator/test/driver_SUITE.erl b/erts/emulator/test/driver_SUITE.erl
index 77ef4ec6a9..902b3824f0 100644
--- a/erts/emulator/test/driver_SUITE.erl
+++ b/erts/emulator/test/driver_SUITE.erl
@@ -2614,7 +2614,7 @@ make_refc_binaries(Term) ->
     transform_bins(F, Term).
 
 build_binary(Elements) ->
-    list_to_binary(build_list(Elements)).
+    rand:bytes(Elements).
 
 build_list(Elements) -> build_list(Elements, []).
 
diff --git a/erts/emulator/test/nif_SUITE.erl b/erts/emulator/test/nif_SUITE.erl
index 55c53d3409..cb9013fc79 100644
--- a/erts/emulator/test/nif_SUITE.erl
+++ b/erts/emulator/test/nif_SUITE.erl
@@ -3482,12 +3482,7 @@ random_sign() ->
     end.
 
 random_binary() ->
-    list_to_binary(random_bytes(rand:uniform(32) - 1)).
-
-random_bytes(0) ->
-    [];
-random_bytes(N) when N > 0 ->
-    [rand:uniform(256) - 1 | random_bytes(N - 1)].
+    rand:bytes(rand:uniform(32) - 1).
 
 random_pid() ->
     Processes = erlang:processes(),
diff --git a/erts/emulator/test/random_iolist.erl b/erts/emulator/test/random_iolist.erl
index 555f063e0a..eb82d6a229 100644
--- a/erts/emulator/test/random_iolist.erl
+++ b/erts/emulator/test/random_iolist.erl
@@ -44,8 +44,8 @@ random_list(N,Acc) ->
     random_list(N-1,[random_byte() | Acc]).
 
 random_binary(N) ->
-    B = list_to_binary(random_list(N,[])),
-    case {rand:uniform(2),size(B)} of
+    B = rand:bytes(N),
+    case {rand:uniform(2),byte_size(B)} of
 	{2,M} when M > 1 ->
 	    S = M-1,
 	    <<_:3,C:S/binary,_:5>> = B,
@@ -53,6 +53,7 @@ random_binary(N) ->
 	_ ->
 	    B
     end.
+
 random_list(N) ->
     random_list(N,[]).
 
diff --git a/lib/stdlib/test/random_iolist.erl b/lib/stdlib/test/random_iolist.erl
index 6621c7ac77..ae81b6c727 100644
--- a/lib/stdlib/test/random_iolist.erl
+++ b/lib/stdlib/test/random_iolist.erl
@@ -40,7 +40,7 @@ random_list(N,Acc) ->
     random_list(N-1,[random_byte() | Acc]).
 
 random_binary(N) ->
-    B = list_to_binary(random_list(N,[])),
+    B = rand:bytes(N),
     case {rand:uniform(2),size(B)} of
 	{2,M} when M > 1 ->
 	    S = M-1,
-- 
2.34.1