From: Bart Schaefer <firstname.lastname@example.org> To: Zsh hackers list <email@example.com> Subject: [PATCH?] The here-doc that never ends Date: Mon, 6 Jun 2022 22:31:55 -0700 [thread overview] Message-ID: <CAH+w=7ZFnQu2=sPteu=ExiZRq-OR71am2W2iXkWHQS-rASOGkg@mail.gmail.com> (raw) zsh -f % true << ( > Note the shell is now at a PS2 prompt. The only way to escape the PS2 prompt is to type a closing paren, at which point you're at heredoc> But then gethere() is waiting for a single line consisting of the C string "(\n)" which it is not possible to enter. The only way out is to interrupt. Brute-force patch for this is below, but it seems like we should be able to catch it sooner? This appears to arise only because zsh accepts <<(command) as well as < <(command) (note spacing). Same effect with: % true <<$'\n' but there doesn't seem to be any good way to prevent that, and bash 5.0.17 behaves the same in that case. diff --git a/Src/parse.c b/Src/parse.c index d612b7e17..5054e59d5 100644 --- a/Src/parse.c +++ b/Src/parse.c @@ -2248,6 +2248,9 @@ par_redir(int *rp, char *idstring) struct heredocs **hd; int htype = type; + if (strchr(tokstr, '\n')) + YYERROR(ecused); + /* * Add two here for the string to remember the HERE * terminator in raw and munged form.
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