File 4021-erl_scan-Stricten-tests-for-integers.patch of Package erlang

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File 4021-erl_scan-Stricten-tests-for-integers.patch of Package erlang (Revision 13808be221626a875b26c001c1f2ed61)

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From f2c7365440f549233bdc45a769c7a909064442ad Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Thu, 26 May 2022 10:07:52 +0200
Subject: [PATCH 1/7] erl_scan: Stricten tests for integers

erl_scan should not accept floating point numbers in strings. Adding
these stricter integer tests will also allow the JIT to generate
more compact native code.

While at it, also rewrite old-style `catch` to `try`...`catch`.
---
 lib/stdlib/src/erl_scan.erl        | 233 +++++++++++++++++++----------
 lib/stdlib/test/erl_scan_SUITE.erl |   7 +-
 2 files changed, 156 insertions(+), 84 deletions(-)

diff --git a/lib/stdlib/src/erl_scan.erl b/lib/stdlib/src/erl_scan.erl
index f2e9d2d7b9..e7e2582c03 100644
--- a/lib/stdlib/src/erl_scan.erl
+++ b/lib/stdlib/src/erl_scan.erl
@@ -264,15 +264,15 @@ string_thing(_) -> "string".
 -define(WHITE_SPACE(C),
         is_integer(C) andalso
          (C >= $\000 andalso C =< $\s orelse C >= $\200 andalso C =< $\240)).
--define(DIGIT(C), C >= $0 andalso C =< $9).
--define(CHAR(C), is_integer(C), C >= 0).
+-define(DIGIT(C), (is_integer(C) andalso $0 =< C andalso C =< $9)).
+-define(CHAR(C), (is_integer(C) andalso 0 =< C andalso C < 16#110000)).
 -define(UNICODE(C),
-        is_integer(C) andalso
+        (is_integer(C) andalso
          (C >= 0 andalso C < 16#D800 orelse
           C > 16#DFFF andalso C < 16#FFFE orelse
-          C > 16#FFFF andalso C =< 16#10FFFF)).
+          C > 16#FFFF andalso C =< 16#10FFFF))).
 
--define(UNI255(C), C >= 0, C =< 16#ff).
+-define(UNI255(C), (is_integer(C) andalso 0 =< C andalso C =< 16#ff)).
 
 options(Opts0) when is_list(Opts0) ->
     Opts = lists:foldr(fun expand_opt/2, [], Opts0),
@@ -363,7 +363,7 @@ string1(Cs, St, Line, Col, Toks) ->
             Error
     end.
 
-scan(Cs, St, Line, Col, Toks, _) ->
+scan(Cs, #erl_scan{}=St, Line, Col, Toks, _) ->
     scan1(Cs, St, Line, Col, Toks).
 
 scan1([$\s|Cs], St, Line, Col, Toks) when St#erl_scan.ws ->
@@ -374,10 +374,6 @@ scan1([$\n|Cs], St, Line, Col, Toks) when St#erl_scan.ws ->
     scan_newline(Cs, St, Line, Col, Toks);
 scan1([$\n|Cs], St, Line, Col, Toks) ->
     skip_white_space(Cs, St, Line+1, new_column(Col, 1), Toks, 0);
-scan1([C|Cs], St, Line, Col, Toks) when C >= $A, C =< $Z ->
-    scan_variable(Cs, St, Line, Col, Toks, [C]);
-scan1([C|Cs], St, Line, Col, Toks) when C >= $a, C =< $z ->
-    scan_atom(Cs, St, Line, Col, Toks, [C]);
 %% Optimization: some very common punctuation characters:
 scan1([$,|Cs], St, Line, Col, Toks) ->
     tok2(Cs, St, Line, Col, Toks, ",", ',', 1);
@@ -397,11 +393,17 @@ scan1([$;|Cs], St, Line, Col, Toks) ->
     tok2(Cs, St, Line, Col, Toks, ";", ';', 1);
 scan1([$_=C|Cs], St, Line, Col, Toks) ->
     scan_variable(Cs, St, Line, Col, Toks, [C]);
-%% More punctuation characters below.
 scan1([$\%|Cs], St, Line, Col, Toks) when not St#erl_scan.comment ->
     skip_comment(Cs, St, Line, Col, Toks, 1);
 scan1([$\%=C|Cs], St, Line, Col, Toks) ->
     scan_comment(Cs, St, Line, Col, Toks, [C]);
+%% More punctuation characters below.
+scan1([C|_], _St, _Line, _Col0, _Toks) when not ?CHAR(C) ->
+    error({not_character,C});
+scan1([C|Cs], St, Line, Col, Toks) when C >= $A, C =< $Z ->
+    scan_variable(Cs, St, Line, Col, Toks, [C]);
+scan1([C|Cs], St, Line, Col, Toks) when C >= $a, C =< $z ->
+    scan_atom(Cs, St, Line, Col, Toks, [C]);
 scan1([C|Cs], St, Line, Col, Toks) when ?DIGIT(C) ->
     scan_number(Cs, St, Line, Col, Toks, [C], no_underscore);
 scan1("..."++Cs, St, Line, Col, Toks) ->
@@ -557,39 +559,49 @@ scan1([]=Cs, _St, Line, Col, Toks) ->
 scan1(eof=Cs, _St, Line, Col, Toks) ->
     {ok,Toks,Cs,Line,Col}.
 
+scan_atom_fun(Cs, #erl_scan{}=St, Line, Col, Toks, Ncs) ->
+    scan_atom(Cs, St, Line, Col, Toks, Ncs).
+
 scan_atom(Cs0, St, Line, Col, Toks, Ncs0) ->
     case scan_name(Cs0, Ncs0) of
         {more,Ncs} ->
-            {more,{[],Col,Toks,Line,Ncs,fun scan_atom/6}};
+            {more,{[],Col,Toks,Line,Ncs,fun scan_atom_fun/6}};
         {Wcs,Cs} ->
-            case catch list_to_atom(Wcs) of
-                Name when is_atom(Name) ->
+            try list_to_atom(Wcs) of
+                Name ->
                     case (St#erl_scan.resword_fun)(Name) of
                         true ->
                             tok2(Cs, St, Line, Col, Toks, Wcs, Name);
                         false ->
                             tok3(Cs, St, Line, Col, Toks, atom, Wcs, Name)
-                    end;
-                _Error ->
+                    end
+            catch
+                _:_ ->
                     Ncol = incr_column(Col, length(Wcs)),
                     scan_error({illegal,atom}, Line, Col, Line, Ncol, Cs)
             end
     end.
 
+scan_variable_fun(Cs, #erl_scan{}=St, Line, Col, Toks, Ncs) ->
+    scan_variable(Cs, St, Line, Col, Toks, Ncs).
+
 scan_variable(Cs0, St, Line, Col, Toks, Ncs0) ->
     case scan_name(Cs0, Ncs0) of
         {more,Ncs} ->
-            {more,{[],Col,Toks,Line,Ncs,fun scan_variable/6}};
+            {more,{[],Col,Toks,Line,Ncs,fun scan_variable_fun/6}};
         {Wcs,Cs} ->
-            case catch list_to_atom(Wcs) of
-                Name when is_atom(Name) ->
-                    tok3(Cs, St, Line, Col, Toks, var, Wcs, Name);
-                _Error ->
+            try list_to_atom(Wcs) of
+                Name ->
+                    tok3(Cs, St, Line, Col, Toks, var, Wcs, Name)
+            catch
+                _:_ ->
                     Ncol = incr_column(Col, length(Wcs)),
                     scan_error({illegal,var}, Line, Col, Line, Ncol, Cs)
             end
     end.
 
+scan_name([C|_]=Cs, Ncs) when not ?CHAR(C) ->
+    {lists:reverse(Ncs),Cs};
 scan_name([C|Cs], Ncs) when C >= $a, C =< $z ->
     scan_name(Cs, [C|Ncs]);
 scan_name([C|Cs], Ncs) when C >= $A, C =< $Z ->
@@ -663,20 +675,31 @@ scan_newline([], _St, Line, Col, Toks) ->
 scan_newline(Cs, St, Line, Col, Toks) ->
     scan_nl_white_space(Cs, St, Line, Col, Toks, "\n").
 
+scan_nl_spcs_fun(Cs, #erl_scan{}=St, Line, Col, Toks, N)
+  when is_integer(N) ->
+    scan_nl_spcs(Cs, St, Line, Col, Toks, N).
+
 scan_nl_spcs([$\s|Cs], St, Line, Col, Toks, N) when N < 17 ->
     scan_nl_spcs(Cs, St, Line, Col, Toks, N+1);
 scan_nl_spcs([]=Cs, _St, Line, Col, Toks, N) ->
-    {more,{Cs,Col,Toks,Line,N,fun scan_nl_spcs/6}};
+    {more,{Cs,Col,Toks,Line,N,fun scan_nl_spcs_fun/6}};
 scan_nl_spcs(Cs, St, Line, Col, Toks, N) ->
     newline_end(Cs, St, Line, Col, Toks, N, nl_spcs(N)).
 
+scan_nl_tabs_fun(Cs, #erl_scan{}=St, Line, Col, Toks, N)
+  when is_integer(N) ->
+    scan_nl_tabs(Cs, St, Line, Col, Toks, N).
+
 scan_nl_tabs([$\t|Cs], St, Line, Col, Toks, N) when N < 11 ->
     scan_nl_tabs(Cs, St, Line, Col, Toks, N+1);
 scan_nl_tabs([]=Cs, _St, Line, Col, Toks, N) ->
-    {more,{Cs,Col,Toks,Line,N,fun scan_nl_tabs/6}};
+    {more,{Cs,Col,Toks,Line,N,fun scan_nl_tabs_fun/6}};
 scan_nl_tabs(Cs, St, Line, Col, Toks, N) ->
     newline_end(Cs, St, Line, Col, Toks, N, nl_tabs(N)).
 
+scan_nl_white_space_fun(Cs, #erl_scan{}=St, Line, Col, Toks, Ncs) ->
+    scan_nl_white_space(Cs, St, Line, Col, Toks, Ncs).
+
 %% Note: returning {more,Cont} is meaningless here; one could just as
 %% well return several tokens. But since tokens() scans up to a full
 %% stop anyway, nothing is gained by not collecting all white spaces.
@@ -689,10 +712,11 @@ scan_nl_white_space([$\n|Cs], St, Line, Col, Toks, Ncs0) ->
     Anno = anno(Line, Col, St, Ncs),
     Token = {white_space,Anno,Ncs},
     scan_newline(Cs, St, Line+1, new_column(Col, length(Ncs)), [Token|Toks]);
-scan_nl_white_space([C|Cs], St, Line, Col, Toks, Ncs) when ?WHITE_SPACE(C) ->
+scan_nl_white_space([C|Cs], St, Line, Col, Toks, Ncs)
+  when ?WHITE_SPACE(C) ->
     scan_nl_white_space(Cs, St, Line, Col, Toks, [C|Ncs]);
 scan_nl_white_space([]=Cs, _St, Line, Col, Toks, Ncs) ->
-    {more,{Cs,Col,Toks,Line,Ncs,fun scan_nl_white_space/6}};
+    {more,{Cs,Col,Toks,Line,Ncs,fun scan_nl_white_space_fun/6}};
 scan_nl_white_space(Cs, #erl_scan{text = false}=St, Line, no_col=Col,
                     Toks, Ncs) ->
     Anno = anno(Line),
@@ -706,40 +730,54 @@ scan_nl_white_space(Cs, St, Line, Col, Toks, Ncs0) ->
 newline_end(Cs, #erl_scan{text = false}=St, Line, no_col=Col,
             Toks, _N, Ncs) ->
     scan1(Cs, St, Line+1, Col, [{white_space,anno(Line),Ncs}|Toks]);
-newline_end(Cs, St, Line, Col, Toks, N, Ncs) ->
+newline_end(Cs, #erl_scan{}=St, Line, Col, Toks, N, Ncs) ->
     Anno = anno(Line, Col, St, Ncs),
     scan1(Cs, St, Line+1, new_column(Col, N), [{white_space,Anno,Ncs}|Toks]).
 
+scan_spcs_fun(Cs, #erl_scan{}=St, Line, Col, Toks, N)
+  when is_integer(N), N >= 1 ->
+    scan_spcs(Cs, St, Line, Col, Toks, N).
+
 scan_spcs([$\s|Cs], St, Line, Col, Toks, N) when N < 16 ->
     scan_spcs(Cs, St, Line, Col, Toks, N+1);
 scan_spcs([]=Cs, _St, Line, Col, Toks, N) ->
-    {more,{Cs,Col,Toks,Line,N,fun scan_spcs/6}};
+    {more,{Cs,Col,Toks,Line,N,fun scan_spcs_fun/6}};
 scan_spcs(Cs, St, Line, Col, Toks, N) ->
     white_space_end(Cs, St, Line, Col, Toks, N, spcs(N)).
 
+scan_tabs_fun(Cs, #erl_scan{}=St, Line, Col, Toks, N)
+  when is_integer(N), N >= 1 ->
+    scan_tabs(Cs, St, Line, Col, Toks, N).
+
 scan_tabs([$\t|Cs], St, Line, Col, Toks, N) when N < 10 ->
     scan_tabs(Cs, St, Line, Col, Toks, N+1);
 scan_tabs([]=Cs, _St, Line, Col, Toks, N) ->
-    {more,{Cs,Col,Toks,Line,N,fun scan_tabs/6}};
+    {more,{Cs,Col,Toks,Line,N,fun scan_tabs_fun/6}};
 scan_tabs(Cs, St, Line, Col, Toks, N) ->
     white_space_end(Cs, St, Line, Col, Toks, N, tabs(N)).
 
+skip_white_space_fun(Cs, #erl_scan{}=St, Line, Col, Toks, N) ->
+    skip_white_space(Cs, St, Line, Col, Toks, N).
+
 skip_white_space([$\n|Cs], St, Line, Col, Toks, _N) ->
     skip_white_space(Cs, St, Line+1, new_column(Col, 1), Toks, 0);
 skip_white_space([C|Cs], St, Line, Col, Toks, N) when ?WHITE_SPACE(C) ->
     skip_white_space(Cs, St, Line, Col, Toks, N+1);
 skip_white_space([]=Cs, _St, Line, Col, Toks, N) ->
-    {more,{Cs,Col,Toks,Line,N,fun skip_white_space/6}};
+    {more,{Cs,Col,Toks,Line,N,fun skip_white_space_fun/6}};
 skip_white_space(Cs, St, Line, Col, Toks, N) ->
     scan1(Cs, St, Line, incr_column(Col, N), Toks).
 
+scan_white_space_fun(Cs, #erl_scan{}=St, Line, Col, Toks, Ncs) ->
+    scan_white_space(Cs, St, Line, Col, Toks, Ncs).
+
 %% Maybe \t and \s should break the loop.
 scan_white_space([$\n|_]=Cs, St, Line, Col, Toks, Ncs) ->
     white_space_end(Cs, St, Line, Col, Toks, length(Ncs), lists:reverse(Ncs));
 scan_white_space([C|Cs], St, Line, Col, Toks, Ncs) when ?WHITE_SPACE(C) ->
     scan_white_space(Cs, St, Line, Col, Toks, [C|Ncs]);
 scan_white_space([]=Cs, _St, Line, Col, Toks, Ncs) ->
-    {more,{Cs,Col,Toks,Line,Ncs,fun scan_white_space/6}};
+    {more,{Cs,Col,Toks,Line,Ncs,fun scan_white_space_fun/6}};
 scan_white_space(Cs, St, Line, Col, Toks, Ncs) ->
     white_space_end(Cs, St, Line, Col, Toks, length(Ncs), lists:reverse(Ncs)).
 
@@ -778,7 +816,7 @@ scan_char([], _St, Line, Col, Toks) ->
 scan_char(eof, _St, Line, Col, _Toks) ->
     scan_error(char, Line, Col, Line, incr_column(Col, 1), eof).
 
-scan_string(Cs, St, Line, Col, Toks, {Wcs,Str,Line0,Col0}) ->
+scan_string(Cs, #erl_scan{}=St, Line, Col, Toks, {Wcs,Str,Line0,Col0}) ->
     case scan_string0(Cs, St, Line, Col, $\", Str, Wcs) of %"
         {more,Ncs,Nline,Ncol,Nstr,Nwcs} ->
             State = {Nwcs,Nstr,Line0,Col0},
@@ -793,7 +831,7 @@ scan_string(Cs, St, Line, Col, Toks, {Wcs,Str,Line0,Col0}) ->
             scan1(Ncs, St, Nline, Ncol, [{string,Anno,Nwcs}|Toks])
     end.
 
-scan_qatom(Cs, St, Line, Col, Toks, {Wcs,Str,Line0,Col0}) ->
+scan_qatom(Cs, #erl_scan{}=St, Line, Col, Toks, {Wcs,Str,Line0,Col0}) ->
     case scan_string0(Cs, St, Line, Col, $\', Str, Wcs) of %'
         {more,Ncs,Nline,Ncol,Nstr,Nwcs} ->
             State = {Nwcs,Nstr,Line0,Col0},
@@ -803,12 +841,13 @@ scan_qatom(Cs, St, Line, Col, Toks, {Wcs,Str,Line0,Col0}) ->
         {error,Nline,Ncol,Nwcs,Ncs} ->
             Estr = string:substr(Nwcs, 1, 16), % Expanded escape chars.
             scan_error({string,$\',Estr}, Line0, Col0, Nline, Ncol, Ncs); %'
-        {Ncs,Nline,Ncol,Nstr,Nwcs} ->
-            case catch list_to_atom(Nwcs) of
+            {Ncs,Nline,Ncol,Nstr,Nwcs} ->
+            try list_to_atom(Nwcs) of
                 A when is_atom(A) ->
                     Anno = anno(Line0, Col0, St, Nstr),
-                    scan1(Ncs, St, Nline, Ncol, [{atom,Anno,A}|Toks]);
-                _ ->
+                    scan1(Ncs, St, Nline, Ncol, [{atom,Anno,A}|Toks])
+            catch
+                _:_ ->
                     scan_error({illegal,atom}, Line0, Col0, Nline, Ncol, Ncs)
             end
     end.
@@ -884,10 +923,11 @@ scan_string1([]=Cs, Line, Col, _Q, Str, Wcs) ->
 scan_string1(eof, Line, Col, _Q, _Str, Wcs) ->
     {error,Line,Col,lists:reverse(Wcs),eof}.
 
--define(OCT(C), C >= $0, C =< $7).
--define(HEX(C), C >= $0 andalso C =< $9 orelse
-                C >= $A andalso C =< $F orelse
-                C >= $a andalso C =< $f).
+-define(OCT(C), (is_integer(C) andalso $0 =< C andalso C =< $7)).
+-define(HEX(C), (is_integer(C) andalso
+                 (C >= $0 andalso C =< $9 orelse
+                  C >= $A andalso C =< $F orelse
+                  C >= $a andalso C =< $f))).
 
 %% \<1-3> octal digits
 scan_escape([O1,O2,O3|Cs], Col) when ?OCT(O1), ?OCT(O2), ?OCT(O3) ->
@@ -939,26 +979,31 @@ scan_escape([], _Col) ->
 scan_escape(eof, Col) ->
     {eof,Col}.
 
-scan_hex([C|Cs], no_col=Col, Wcs) when ?HEX(C) ->
-    scan_hex(Cs, Col, [C|Wcs]);
 scan_hex([C|Cs], Col, Wcs) when ?HEX(C) ->
-    scan_hex(Cs, Col+1, [C|Wcs]);
+    scan_hex(Cs, incr_column(Col, 1), [C|Wcs]);
 scan_hex(Cs, Col, Wcs) ->
-    scan_esc_end(Cs, Col, Wcs, 16, "x{").
+    scan_hex_end(Cs, Col, Wcs, "x{").
 
-scan_esc_end([$}|Cs], Col, Wcs0, B, Str0) ->
+scan_hex_end([$}|Cs], Col, [], _Str) ->
+    %% Empty escape sequence.
+    {error,Cs,{illegal,character},incr_column(Col, 1)};
+scan_hex_end([$}|Cs], Col, Wcs0, Str0) ->
     Wcs = lists:reverse(Wcs0),
-    case catch erlang:list_to_integer(Wcs, B) of
+    try list_to_integer(Wcs, 16) of
         Val when ?UNICODE(Val) ->
             {Val,Str0++Wcs++[$}],Cs,incr_column(Col, 1)};
-        _ ->
+        _Val ->
+            {error,Cs,{illegal,character},incr_column(Col, 1)}
+    catch
+        error:system_limit ->
+            %% Extremely unlikely to occur in practice.
             {error,Cs,{illegal,character},incr_column(Col, 1)}
     end;
-scan_esc_end([], _Col, _Wcs, _B, _Str0) ->
+scan_hex_end([], _Col, _Wcs, _Str0) ->
     more;
-scan_esc_end(eof, Col, _Wcs, _B, _Str0) ->
+scan_hex_end(eof, Col, _Wcs, _Str0) ->
     {eof,Col};
-scan_esc_end(Cs, Col, _Wcs, _B, _Str0) ->
+scan_hex_end(Cs, Col, _Wcs, _Str0) ->
     {error,Cs,{illegal,character},Col}.
 
 escape_char($n) -> $\n;                         % \n = LF
@@ -972,7 +1017,7 @@ escape_char($s) -> $\s;                         % \s = SPC
 escape_char($d) -> $\d;                         % \d = DEL
 escape_char(C) -> C.
 
-scan_number(Cs, St, Line, Col, Toks, {Ncs, Us}) ->
+scan_number(Cs, #erl_scan{}=St, Line, Col, Toks, {Ncs, Us}) ->
     scan_number(Cs, St, Line, Col, Toks, Ncs, Us).
 
 scan_number([C|Cs], St, Line, Col, Toks, Ncs, Us) when ?DIGIT(C) ->
@@ -988,22 +1033,28 @@ scan_number([$.]=Cs, _St, Line, Col, Toks, Ncs, Us) ->
     {more,{Cs,Col,Toks,Line,{Ncs,Us},fun scan_number/6}};
 scan_number([$#|Cs]=Cs0, St, Line, Col, Toks, Ncs0, Us) ->
     Ncs = lists:reverse(Ncs0),
-    case catch list_to_integer(remove_digit_separators(Ncs, Us)) of
-        B when B >= 2, B =< 1+$Z-$A+10 ->
+    try list_to_integer(remove_digit_separators(Ncs, Us)) of
+        B when is_integer(B), 2 =< B, B =< 1+$Z-$A+10 ->
             Bcs = Ncs++[$#],
             scan_based_int(Cs, St, Line, Col, Toks, B, [], Bcs, no_underscore);
-        B ->
+        B when is_integer(B) ->
             Len = length(Ncs),
             scan_error({base,B}, Line, Col, Line, incr_column(Col, Len), Cs0)
+    catch
+        error:system_limit ->
+            %% Extremely unlikely to occur in practice.
+            scan_error({illegal,base}, Line, Col, Line, Col, Cs0)
     end;
 scan_number([]=Cs, _St, Line, Col, Toks, Ncs, Us) ->
     {more,{Cs,Col,Toks,Line,{Ncs,Us},fun scan_number/6}};
 scan_number(Cs, St, Line, Col, Toks, Ncs0, Us) ->
     Ncs = lists:reverse(Ncs0),
-    case catch list_to_integer(remove_digit_separators(Ncs, Us)) of
-        N when is_integer(N) ->
-            tok3(Cs, St, Line, Col, Toks, integer, Ncs, N);
-        _ ->
+    try list_to_integer(remove_digit_separators(Ncs, Us), 10) of
+        N ->
+            tok3(Cs, St, Line, Col, Toks, integer, Ncs, N)
+    catch
+        error:system_limit ->
+            %% Extremely unlikely to occur in practice.
             Ncol = incr_column(Col, length(Ncs)),
             scan_error({illegal,integer}, Line, Col, Line, Ncol, Cs)
     end.
@@ -1014,11 +1065,14 @@ remove_digit_separators(Number, with_underscore) ->
     [C || C <- Number, C =/= $_].
 
 -define(BASED_DIGIT(C, B),
-        ((?DIGIT(C) andalso C < $0 + B)
-         orelse (C >= $A andalso B > 10 andalso C < $A + B - 10)
-         orelse (C >= $a andalso B > 10 andalso C < $a + B - 10))).
-
-scan_based_int(Cs, St, Line, Col, Toks, {B,NCs,BCs,Us}) ->
+        (is_integer(C)
+         andalso
+           ((?DIGIT(C) andalso C < $0 + B)
+            orelse (C >= $A andalso B > 10 andalso C < $A + B - 10)
+            orelse (C >= $a andalso B > 10 andalso C < $a + B - 10)))).
+
+scan_based_int(Cs, #erl_scan{}=St, Line, Col, Toks, {B,NCs,BCs,Us})
+  when is_integer(B), 2 =< B, B =< 1+$Z-$A+10 ->
     scan_based_int(Cs, St, Line, Col, Toks, B, NCs, BCs, Us).
 
 scan_based_int([C|Cs], St, Line, Col, Toks, B, Ncs, Bcs, Us) when
@@ -1032,18 +1086,25 @@ scan_based_int([$_]=Cs, _St, Line, Col, Toks, B, NCs, BCs, Us) ->
     {more,{Cs,Col,Toks,Line,{B,NCs,BCs,Us},fun scan_based_int/6}};
 scan_based_int([]=Cs, _St, Line, Col, Toks, B, NCs, BCs, Us) ->
     {more,{Cs,Col,Toks,Line,{B,NCs,BCs,Us},fun scan_based_int/6}};
-scan_based_int(Cs, St, Line, Col, Toks, B, Ncs0, Bcs, Us) ->
+scan_based_int(Cs, _St, Line, Col, _Toks, _B, [], Bcs, _Us) ->
+    %% No actual digits following the base.
+    Len = length(Bcs),
+    Ncol = incr_column(Col, Len),
+    scan_error({illegal,integer}, Line, Col, Line, Ncol, Cs);
+scan_based_int(Cs, St, Line, Col, Toks, B, Ncs0, [_|_]=Bcs, Us) ->
     Ncs = lists:reverse(Ncs0),
-    case catch erlang:list_to_integer(remove_digit_separators(Ncs, Us), B) of
-        N when is_integer(N) ->
-            tok3(Cs, St, Line, Col, Toks, integer, Bcs++Ncs, N);
-        _ ->
+    try list_to_integer(remove_digit_separators(Ncs, Us), B) of
+        N ->
+            tok3(Cs, St, Line, Col, Toks, integer, Bcs++Ncs, N)
+    catch
+        error:system_limit ->
+            %% Extremely unlikely to occur in practice.
             Len = length(Bcs)+length(Ncs),
             Ncol = incr_column(Col, Len),
             scan_error({illegal,integer}, Line, Col, Line, Ncol, Cs)
     end.
 
-scan_fraction(Cs, St, Line, Col, Toks, {Ncs,Us}) ->
+scan_fraction(Cs, #erl_scan{}=St, Line, Col, Toks, {Ncs,Us}) ->
     scan_fraction(Cs, St, Line, Col, Toks, Ncs, Us).
 
 scan_fraction([C|Cs], St, Line, Col, Toks, Ncs, Us) when ?DIGIT(C) ->
@@ -1060,7 +1121,7 @@ scan_fraction([]=Cs, _St, Line, Col, Toks, Ncs, Us) ->
 scan_fraction(Cs, St, Line, Col, Toks, Ncs, Us) ->
     float_end(Cs, St, Line, Col, Toks, Ncs, Us).
 
-scan_exponent_sign(Cs, St, Line, Col, Toks, {Ncs, Us}) ->
+scan_exponent_sign(Cs, #erl_scan{}=St, Line, Col, Toks, {Ncs, Us}) ->
     scan_exponent_sign(Cs, St, Line, Col, Toks, Ncs, Us).
 
 scan_exponent_sign([C|Cs], St, Line, Col, Toks, Ncs, Us) when
@@ -1071,7 +1132,7 @@ scan_exponent_sign([]=Cs, _St, Line, Col, Toks, Ncs, Us) ->
 scan_exponent_sign(Cs, St, Line, Col, Toks, Ncs, Us) ->
     scan_exponent(Cs, St, Line, Col, Toks, Ncs, Us).
 
-scan_exponent(Cs, St, Line, Col, Toks, {Ncs, Us}) ->
+scan_exponent(Cs, #erl_scan{}=St, Line, Col, Toks, {Ncs, Us}) ->
     scan_exponent(Cs, St, Line, Col, Toks, Ncs, Us).
 
 scan_exponent([C|Cs], St, Line, Col, Toks, Ncs, Us) when ?DIGIT(C) ->
@@ -1088,14 +1149,18 @@ scan_exponent(Cs, St, Line, Col, Toks, Ncs, Us) ->
 
 float_end(Cs, St, Line, Col, Toks, Ncs0, Us) ->
     Ncs = lists:reverse(Ncs0),
-    case catch list_to_float(remove_digit_separators(Ncs, Us)) of
-        F when is_float(F) ->
-            tok3(Cs, St, Line, Col, Toks, float, Ncs, F);
-        _ ->
+    try list_to_float(remove_digit_separators(Ncs, Us)) of
+        F ->
+            tok3(Cs, St, Line, Col, Toks, float, Ncs, F)
+    catch
+        _:_ ->
             Ncol = incr_column(Col, length(Ncs)),
             scan_error({illegal,float}, Line, Col, Line, Ncol, Cs)
     end.
 
+skip_comment_fun(Cs, #erl_scan{}=St, Line, Col, Toks, N) ->
+    skip_comment(Cs, St, Line, Col, Toks, N).
+
 skip_comment([C|Cs], St, Line, Col, Toks, N) when C =/= $\n, ?CHAR(C) ->
     case ?UNICODE(C) of
         true ->
@@ -1105,11 +1170,15 @@ skip_comment([C|Cs], St, Line, Col, Toks, N) when C =/= $\n, ?CHAR(C) ->
             scan_error({illegal,character}, Line, Col, Line, Ncol, Cs)
     end;
 skip_comment([]=Cs, _St, Line, Col, Toks, N) ->
-    {more,{Cs,Col,Toks,Line,N,fun skip_comment/6}};
+    {more,{Cs,Col,Toks,Line,N,fun skip_comment_fun/6}};
 skip_comment(Cs, St, Line, Col, Toks, N) ->
     scan1(Cs, St, Line, incr_column(Col, N), Toks).
 
-scan_comment([C|Cs], St, Line, Col, Toks, Ncs) when C =/= $\n, ?CHAR(C) ->
+scan_comment_fun(Cs, #erl_scan{}=St, Line, Col, Toks, Ncs) ->
+    scan_comment(Cs, St, Line, Col, Toks, Ncs).
+
+scan_comment([C|Cs], St, Line, Col, Toks, Ncs)
+  when C =/= $\n, ?CHAR(C) ->
     case ?UNICODE(C) of
         true ->
             scan_comment(Cs, St, Line, Col, Toks, [C|Ncs]);
@@ -1118,33 +1187,33 @@ scan_comment([C|Cs], St, Line, Col, Toks, Ncs) when C =/= $\n, ?CHAR(C) ->
             scan_error({illegal,character}, Line, Col, Line, Ncol, Cs)
     end;
 scan_comment([]=Cs, _St, Line, Col, Toks, Ncs) ->
-    {more,{Cs,Col,Toks,Line,Ncs,fun scan_comment/6}};
+    {more,{Cs,Col,Toks,Line,Ncs,fun scan_comment_fun/6}};
 scan_comment(Cs, St, Line, Col, Toks, Ncs0) ->
     Ncs = lists:reverse(Ncs0),
     tok3(Cs, St, Line, Col, Toks, comment, Ncs, Ncs).
 
 tok2(Cs, #erl_scan{text = false}=St, Line, no_col=Col, Toks, _Wcs, P) ->
     scan1(Cs, St, Line, Col, [{P,anno(Line)}|Toks]);
-tok2(Cs, St, Line, Col, Toks, Wcs, P) ->
+tok2(Cs, #erl_scan{}=St, Line, Col, Toks, Wcs, P) ->
     Anno = anno(Line, Col, St, Wcs),
     scan1(Cs, St, Line, incr_column(Col, length(Wcs)), [{P,Anno}|Toks]).
 
 tok2(Cs, #erl_scan{text = false}=St, Line, no_col=Col, Toks, _Wcs, P, _N) ->
     scan1(Cs, St, Line, Col, [{P,anno(Line)}|Toks]);
-tok2(Cs, St, Line, Col, Toks, Wcs, P, N) ->
+tok2(Cs, #erl_scan{}=St, Line, Col, Toks, Wcs, P, N) ->
     Anno = anno(Line, Col, St, Wcs),
     scan1(Cs, St, Line, incr_column(Col, N), [{P,Anno}|Toks]).
 
 tok3(Cs, #erl_scan{text = false}=St, Line, no_col=Col, Toks, Item, _S, Sym) ->
     scan1(Cs, St, Line, Col, [{Item,anno(Line),Sym}|Toks]);
-tok3(Cs, St, Line, Col, Toks, Item, String, Sym) ->
+tok3(Cs, #erl_scan{}=St, Line, Col, Toks, Item, String, Sym) ->
     Token = {Item,anno(Line, Col, St, String),Sym},
     scan1(Cs, St, Line, incr_column(Col, length(String)), [Token|Toks]).
 
 tok3(Cs, #erl_scan{text = false}=St, Line, no_col=Col, Toks, Item,
      _String, Sym, _Length) ->
     scan1(Cs, St, Line, Col, [{Item,anno(Line),Sym}|Toks]);
-tok3(Cs, St, Line, Col, Toks, Item, String, Sym, Length) ->
+tok3(Cs, #erl_scan{}=St, Line, Col, Toks, Item, String, Sym, Length) ->
     Token = {Item,anno(Line, Col, St, String),Sym},
     scan1(Cs, St, Line, incr_column(Col, Length), [Token|Toks]).
 
diff --git a/lib/stdlib/test/erl_scan_SUITE.erl b/lib/stdlib/test/erl_scan_SUITE.erl
index ee8bc8420f..6c4694bebe 100644
--- a/lib/stdlib/test/erl_scan_SUITE.erl
+++ b/lib/stdlib/test/erl_scan_SUITE.erl
@@ -676,6 +676,8 @@ illegal() ->
 
 crashes() ->
     {'EXIT',_} = (catch {foo, erl_scan:string([-1])}), % type error
+    {'EXIT',_} = (catch erl_scan:string("'a" ++ [999999999] ++ "c'")),
+
     {'EXIT',_} = (catch {foo, erl_scan:string("$"++[-1])}),
     {'EXIT',_} = (catch {foo, erl_scan:string("$\\"++[-1])}),
     {'EXIT',_} = (catch {foo, erl_scan:string("$\\^"++[-1])}),
@@ -698,6 +700,7 @@ crashes() ->
          (catch {foo, erl_scan:string("% foo"++[a],{1,1})}),
 
     {'EXIT',_} = (catch {foo, erl_scan:string([3.0])}), % type error
+    {'EXIT',_} = (catch {foo, erl_scan:string("A" ++ [999999999])}),
 
     ok.
 
-- 
2.35.3

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File 4021-erl_scan-Stricten-tests-for-integers.patch of Package erlang (Revision 13808be221626a875b26c001c1f2ed61)

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