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authorHarald van Dijk <harald@gigawatt.nl>2017-06-30 01:33:29 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2018-03-10 16:01:43 +0800
commit7f31919cba4b17af883db77f99bfa974f0821361 (patch)
tree363de67b2d4b3b6042626651529eb5a5b2b2a70f /src
parentman: Small cleanup for Command Line Editing (diff)
downloaddash-7f31919cba4b17af883db77f99bfa974f0821361.tar.gz
dash-7f31919cba4b17af883db77f99bfa974f0821361.zip
input: Fix here-document redirection with vi/emacs on
On 27/06/17 16:29, Zando Fardones wrote:
> Hello,
>
> I think I've found a bug when using the here-document redirection in
> an interactive shell. What basically happens is that you can't see the
> command output if you set the "vi" or "emacs" options.

That's not quite what happens: the here-document contents got lost, so
there is no command output to see. Nice find.

The problem is that getprompt() is implicitly called by el_gets(). This
messes with the memory used by the parser to store the here-document's
contents. In the non-emacs/vi case, the prompt is explicitly written by
setprompt(), which wraps the getprompt() call in a
pushstackmark()/popstackmark() pair to restore the state so that parsing
can continue. But when getprompt() is called by el_gets(), it knows
nothing about this.

The whole call to el_gets() can be surrounded by another
pushstackmark()/popstackmark() pair to solve the problem, as attached.

Cheers,
Harald van Dijk

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to '')
-rw-r--r--src/input.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/src/input.c b/src/input.c
index 06c08d4..e53423c 100644
--- a/src/input.c
+++ b/src/input.c
@@ -147,8 +147,12 @@ retry:
 		static const char *rl_cp;
 		static int el_len;
 
-		if (rl_cp == NULL)
+		if (rl_cp == NULL) {
+			struct stackmark smark;
+			pushstackmark(&smark, stackblocksize());
 			rl_cp = el_gets(el, &el_len);
+			popstackmark(&smark);
+		}
 		if (rl_cp == NULL)
 			nr = 0;
 		else {