texlive[55770] Build/source/texk/web2c/alephdir: sync with tex.ch

[commits+kakuto at tug.org]

Revision: 55770
          http://tug.org/svn/texlive?view=revision&revision=55770
Author:   kakuto
Date:     2020-07-07 02:26:05 +0200 (Tue, 07 Jul 2020)
Log Message:
-----------
sync with tex.ch

Modified Paths:
--------------
    trunk/Build/source/texk/web2c/alephdir/ChangeLog
    trunk/Build/source/texk/web2c/alephdir/com16bit.ch

Modified: trunk/Build/source/texk/web2c/alephdir/ChangeLog
===================================================================
--- trunk/Build/source/texk/web2c/alephdir/ChangeLog	2020-07-06 23:53:27 UTC (rev 55769)
+++ trunk/Build/source/texk/web2c/alephdir/ChangeLog	2020-07-07 00:26:05 UTC (rev 55770)
@@ -1,3 +1,8 @@
+2020-07-07  Akira Kakuto  <kakuto at w32tex.org>
+
+	* com16bit.ch: Sync with tex.ch (avoid seg fault in unusual
+	interaction sequence).
+
 2020-02-10  Akira Kakuto  <kakuto at w32tex.org>
 
 	* com16bit.ch: Sync with tex.ch for changes by Phelype Oleinik

Modified: trunk/Build/source/texk/web2c/alephdir/com16bit.ch
===================================================================
--- trunk/Build/source/texk/web2c/alephdir/com16bit.ch	2020-07-06 23:53:27 UTC (rev 55769)
+++ trunk/Build/source/texk/web2c/alephdir/com16bit.ch	2020-07-07 00:26:05 UTC (rev 55770)
@@ -729,7 +729,26 @@
 end;
 @z
 
- at x [6.84] l.1888 - Implement the switch-to-editor option.
+% Original reports:
+%   https://tex.stackexchange.com/questions/551313/
+%   https://tug.org/pipermail/tex-live/2020-June/045876.html
+%
+% This will probably be fixed by DEK in the 2021 tuneup in a different
+% way (so we'll have to remove or alter this change), but the interaction
+% sequence in the reports above causes a segmentation fault in web2c -
+% writing to the closed \write15 stream because we wrongly decrement
+% selector from 16 to 15 in term_input, due to the lack of this check in
+% a recursive error() call.
+%
+ at x [6.83] l.1893 - avoid wrong interaction 
+loop at +begin continue: clear_for_error_prompt; prompt_input("? ");
+ at y
+loop at +begin continue:
+if interaction<>error_stop_mode then return;
+clear_for_error_prompt; prompt_input("? ");
+ at z
+
+ at x [6.84] l.1904 - Implement the switch-to-editor option.
 line ready to be edited. But such an extension requires some system
 wizardry, so the present implementation simply types out the name of the
 file that should be