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From: Herbert Xu <herbert@gondor.apana.org.au>
To: Harald van Dijk <harald@gigawatt.nl>
Cc: luigi.tarenga@gmail.com, dash@vger.kernel.org
Subject: Re: [BUG] regression in builtin echo
Date: Fri, 2 Sep 2016 21:14:39 +0800	[thread overview]
Message-ID: <20160902131439.GA12162@gondor.apana.org.au> (raw)
In-Reply-To: <3efcd42c-e20b-3506-3d62-69b85c027ef4@gigawatt.nl>

Harald van Dijk <harald@gigawatt.nl> wrote:
> While the original code implementing the echo command was overly 
> complicated, the simplified version does not do the right thing, as you 
> noticed.


However, we don't need to rewrite the function to fix this.

Subject: builtin: Fix echo -n early termination

The commit 7a784244625d5489c0fc779201c349555dc5f8bc ("[BUILTIN]
Simplify echo command") broke echo -n by making it always terminate
after printing the first argument.

This patch fixes this by only terminating when we have reached
the end of the arguments.

Fixes: 7a784244625d ("[BUILTIN] Simplify echo command")
Reported-by: Luigi Tarenga <luigi.tarenga@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/src/bltin/printf.c b/src/bltin/printf.c
index 1112253..a626cee 100644
--- a/src/bltin/printf.c
+++ b/src/bltin/printf.c
@@ -459,7 +459,7 @@ echocmd(int argc, char **argv)
 		if (likely(*argv))
 			nonl += print_escape_str("%s", NULL, NULL, *argv++);
-		if (nonl > 0)
+		if (likely((nonl + !*argv) > 1))
 		c = *argv ? ' ' : '\n';

Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

  reply	other threads:[~2016-09-02 13:14 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CAKkO-EgCkv48unwXBjN1JdjSNx3_D1yCZQhde7WJedOFRUDaGg@mail.gmail.com>
2016-09-01 20:18 ` [BUG] regression in builtin echo Harald van Dijk
2016-09-02 13:14   ` Herbert Xu [this message]
2016-09-02 14:16     ` Jilles Tjoelker
2016-09-02 14:19       ` Herbert Xu
2016-09-02 15:24         ` Jilles Tjoelker

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