File 0152-Make-sure-to-keep-tail-in-string-next_grap... of Package erlang

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File 0152-Make-sure-to-keep-tail-in-string-next_grapheme-1.patch of Package erlang (Revision 3c9c0418baf827024777fc45d8229550)

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From 2f0bf4fbd45acc9f6815b4acfb99d64fadca9fa8 Mon Sep 17 00:00:00 2001
From: Christian Rasmussen <christian.rasmussen@me.com>
Date: Fri, 11 Mar 2022 23:44:19 +0100
Subject: [PATCH 1/2] Make sure to keep tail in string:next_grapheme/1

---
 lib/stdlib/test/string_SUITE.erl           | 14 ++++++++++----
 lib/stdlib/uc_spec/gen_unicode_mod.escript |  6 +++---
 2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/lib/stdlib/test/string_SUITE.erl b/lib/stdlib/test/string_SUITE.erl
index 4475d7c06e..2539bf8692 100644
--- a/lib/stdlib/test/string_SUITE.erl
+++ b/lib/stdlib/test/string_SUITE.erl
@@ -643,19 +643,25 @@ cd_gc(_) ->
     [] = string:next_codepoint(""),
     [] = string:next_codepoint(<<>>),
     [] = string:next_codepoint([<<>>]),
+    [$a|""] = string:next_codepoint("a"),
+    [$a|<<>>] = string:next_codepoint(<<"a">>),
+    [$a|[<<>>,$b]] = string:next_codepoint([<<"a">>,$b]),
     "abcd" = string:next_codepoint("abcd"),
-    [$e,778] = string:next_codepoint([$e,778]),
+    [$e|[778]] = string:next_codepoint([$e,778]),
     [$e|<<204,138>>] = string:next_codepoint(<<$e,778/utf8>>),
-    [778|_] = string:next_codepoint(tl(string:next_codepoint(<<$e,778/utf8>>))),
+    [778|<<>>] = string:next_codepoint(tl(string:next_codepoint(<<$e,778/utf8>>))),
     [0|<<128,1>>] = string:next_codepoint(<<0,128,1>>),
     {error,<<128,1>>} = string:next_codepoint(<<128,1>>),
 
     [] = string:next_grapheme(""),
     [] = string:next_grapheme(<<>>),
     [] = string:next_grapheme([<<>>]),
+    [$a|""] = string:next_grapheme("a"),
+    [$a|<<>>] = string:next_grapheme(<<"a">>),
+    [$a|[<<>>,$b]] = string:next_grapheme([<<"a">>,$b]),
     "abcd" = string:next_grapheme("abcd"),
-    [[$e,778]] = string:next_grapheme([$e,778]),
-    [[$e,778]] = string:next_grapheme(<<$e,778/utf8>>),
+    [[$e,778]|""] = string:next_grapheme([$e,778]),
+    [[$e,778]|<<>>] = string:next_grapheme(<<$e,778/utf8>>),
     [0|<<128,1>>] = string:next_grapheme(<<0,128,1>>),
     {error,<<128,1>>} = string:next_grapheme(<<128,1>>),
 
diff --git a/lib/stdlib/uc_spec/gen_unicode_mod.escript b/lib/stdlib/uc_spec/gen_unicode_mod.escript
index 8239b0d5a1..af27e47337 100644
--- a/lib/stdlib/uc_spec/gen_unicode_mod.escript
+++ b/lib/stdlib/uc_spec/gen_unicode_mod.escript
@@ -671,7 +671,7 @@ gen_gc(Fd, GBP) ->
                  "        false -> [CP0|T0]; % losing work done on T\n"
                  "        _TrueOrZWJ -> gc_extend2(cp(T), T, [CP,CP0])\n"
                  "    end;\n"
-                 "gc_extend([], _, CP) -> [CP];\n"
+                 "gc_extend([], T0, CP) -> [CP|T0];\n"
                  "gc_extend({error,R}, _, CP) -> [CP|R].\n\n"),
     io:put_chars(Fd,
                  "gc_extend2([CP|T], T0, Acc) ->\n"
@@ -679,8 +679,8 @@ gen_gc(Fd, GBP) ->
                  "        false -> [lists:reverse(Acc)|T0]; % losing work done on T\n"
                  "        _TrueOrZWJ -> gc_extend2(cp(T), T, [CP|Acc])\n"
                  "    end;\n"
-                 "gc_extend2([], _, Acc) ->\n"
-                 "    [lists:reverse(Acc)];\n"
+                 "gc_extend2([], T0, Acc) ->\n"
+                 "    [lists:reverse(Acc)|T0];\n"
                  "gc_extend2({error,R}, _, Acc) ->\n"
                  "    [lists:reverse(Acc)] ++ [R].\n\n"
                  ),
-- 
2.34.1

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File 0152-Make-sure-to-keep-tail-in-string-next_grapheme-1.patch of Package erlang (Revision 3c9c0418baf827024777fc45d8229550)

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